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Replay crashes on epoll_pwait2 syscall within libevent #3827

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mozzieongit opened this issue Sep 20, 2024 · 2 comments
Open

Replay crashes on epoll_pwait2 syscall within libevent #3827

mozzieongit opened this issue Sep 20, 2024 · 2 comments

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@mozzieongit
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I've tried to find a minimal example to reproduce this for a while now, but then get different errors or none at all, so here's the original one (I'll add the other traces collapsed at the end):
Replaying a recording of the program using libevent (and libxdp), crashes at the syscall epoll_pwait2 inside libevent (epoll.c:epoll_dispatch line 517 with libevent commit 6d8c38af). The weird thing about this is that the replay crashes at the first execution of said syscall, but only if the recording includes code executed later. If the recording doesn't include the later code (AF_XDP socket related code in this instance), the replay completes just fine.
Maybe this already helps, else I'll have to see when I have time to further investigate.

[FATAL src/ReplayTask.cc:130:validate_regs()]
 (task 42451 (rec:42307) at time 1951)
 -> Assertion `!comparison.mismatch_count' failed to hold. Mismatched registers, replay vs rec: rdx 0x20 != (nil), rsi 0x62b776b6c950 != (nil), rdi 0x10 != 0xc, rbp 0x7ffd9986fe00 != (nil), r9 0x8 != (nil), r10 (nil) != 0x40, r12 0x70204070 != (nil), r13 0x70204000 != (nil), r14 (nil) != 0xc, r15 (nil) != 0x40, orig_rax 0x1b9 != 0x2c
Tail of trace dump:
{
  real_time:7626.343019 global_time:1931, event:`SYSCALL: wait4' (state:ENTERING_SYSCALL) tid:42306, ticks:20875
rax:0xffffffffffffffda rbx:0x7d81a05fffa0 rcx:0xffffffffffffffff rdx:0x1 rsi:0x7ffd9986fff4 rdi:0xffffffff rbp:0x7ffd99870080 rsp:0x7d81a05ffdb0 r8:0x8 r9:0x7d81a938b380 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x3d r15:0x62b748eda2b8 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x3d fs_base:0x7d81a90f0d00 gs_base:0x0
}
{
  real_time:7626.343090 global_time:1932, event:`SYSCALL: wait4' (state:EXITING_SYSCALL) tid:42306, ticks:20875
rax:0x0 rbx:0x7d81a05fffa0 rcx:0xffffffffffffffff rdx:0x1 rsi:0x7ffd9986fff4 rdi:0xffffffff rbp:0x7ffd99870080 rsp:0x7d81a05ffdb0 r8:0x8 r9:0x7d81a938b380 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x3d r15:0x62b748eda2b8 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x3d fs_base:0x7d81a90f0d00 gs_base:0x0
  { tid:42306, addr:0x7ffd9986fff4, length:0x4 }
}
{
  real_time:7626.343171 global_time:1933, event:`SYSCALLBUF_FLUSH' tid:42306, ticks:20923
  { syscall:'ppoll', ret:0x0, size:0x20 }
}
{
  real_time:7626.343202 global_time:1934, event:`SYSCALL: ppoll' (state:ENTERING_SYSCALL) tid:42306, ticks:20923
rax:0xffffffffffffffda rbx:0x7d81a05fffa0 rcx:0xffffffffffffffff rdx:0x7ffd9986ff00 rsi:0x2 rdi:0x62b748f11180 rbp:0x7ffd9986ff01 rsp:0x7d81a05ffd60 r8:0x8 r9:0x7d81a938b380 r10:0x0 r11:0x246 r12:0x0 r13:0x70104000 r14:0x0 r15:0x70104040 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x10f fs_base:0x7d81a90f0d00 gs_base:0x0
}
{
  real_time:7626.343222 global_time:1935, event:`SYSCALLBUF_RESET' tid:42306, ticks:20923
}
{
  real_time:7627.345126 global_time:1936, event:`SYSCALL: ppoll' (state:EXITING_SYSCALL) tid:42306, ticks:20923
rax:0x0 rbx:0x7d81a05fffa0 rcx:0xffffffffffffffff rdx:0x7ffd9986ff00 rsi:0x2 rdi:0x62b748f11180 rbp:0x7ffd9986ff01 rsp:0x7d81a05ffd60 r8:0x8 r9:0x7d81a938b380 r10:0x0 r11:0x246 r12:0x0 r13:0x70104000 r14:0x0 r15:0x70104040 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x10f fs_base:0x7d81a90f0d00 gs_base:0x0
  { tid:42306, addr:0x7ffd9986ff00, length:0x10 }
  { tid:42306, addr:0x62b748f11180, length:0x10 }
}
{
  real_time:7627.345260 global_time:1937, event:`SYSCALL: wait4' (state:ENTERING_SYSCALL) tid:42306, ticks:20953
rax:0xffffffffffffffda rbx:0x7d81a05fffa0 rcx:0xffffffffffffffff rdx:0x1 rsi:0x7ffd9986fff4 rdi:0xffffffff rbp:0x7ffd99870080 rsp:0x7d81a05ffdb0 r8:0x8 r9:0x7d81a938b380 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x3d r15:0x62b748eda2b8 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x3d fs_base:0x7d81a90f0d00 gs_base:0x0
}
{
  real_time:7627.345329 global_time:1938, event:`SYSCALL: wait4' (state:EXITING_SYSCALL) tid:42306, ticks:20953
rax:0x0 rbx:0x7d81a05fffa0 rcx:0xffffffffffffffff rdx:0x1 rsi:0x7ffd9986fff4 rdi:0xffffffff rbp:0x7ffd99870080 rsp:0x7d81a05ffdb0 r8:0x8 r9:0x7d81a938b380 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x3d r15:0x62b748eda2b8 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x3d fs_base:0x7d81a90f0d00 gs_base:0x0
  { tid:42306, addr:0x7ffd9986fff4, length:0x4 }
}
{
  real_time:7627.345404 global_time:1939, event:`SYSCALLBUF_FLUSH' tid:42306, ticks:21001
  { syscall:'ppoll', ret:0x0, size:0x20 }
}
{
  real_time:7627.345433 global_time:1940, event:`SYSCALL: ppoll' (state:ENTERING_SYSCALL) tid:42306, ticks:21001
rax:0xffffffffffffffda rbx:0x7d81a05fffa0 rcx:0xffffffffffffffff rdx:0x7ffd9986ff00 rsi:0x2 rdi:0x62b748f11180 rbp:0x7ffd9986ff01 rsp:0x7d81a05ffd60 r8:0x8 r9:0x7d81a938b380 r10:0x0 r11:0x246 r12:0x0 r13:0x70104000 r14:0x0 r15:0x70104040 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x10f fs_base:0x7d81a90f0d00 gs_base:0x0
}
{
  real_time:7627.345447 global_time:1941, event:`SYSCALLBUF_RESET' tid:42306, ticks:21001
}
{
  real_time:7628.347238 global_time:1942, event:`SYSCALL: ppoll' (state:EXITING_SYSCALL) tid:42306, ticks:21001
rax:0x0 rbx:0x7d81a05fffa0 rcx:0xffffffffffffffff rdx:0x7ffd9986ff00 rsi:0x2 rdi:0x62b748f11180 rbp:0x7ffd9986ff01 rsp:0x7d81a05ffd60 r8:0x8 r9:0x7d81a938b380 r10:0x0 r11:0x246 r12:0x0 r13:0x70104000 r14:0x0 r15:0x70104040 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x10f fs_base:0x7d81a90f0d00 gs_base:0x0
  { tid:42306, addr:0x7ffd9986ff00, length:0x10 }
  { tid:42306, addr:0x62b748f11180, length:0x10 }
}
{
  real_time:7628.347391 global_time:1943, event:`SYSCALL: wait4' (state:ENTERING_SYSCALL) tid:42306, ticks:21031
rax:0xffffffffffffffda rbx:0x7d81a05fffa0 rcx:0xffffffffffffffff rdx:0x1 rsi:0x7ffd9986fff4 rdi:0xffffffff rbp:0x7ffd99870080 rsp:0x7d81a05ffdb0 r8:0x8 r9:0x7d81a938b380 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x3d r15:0x62b748eda2b8 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x3d fs_base:0x7d81a90f0d00 gs_base:0x0
}
{
  real_time:7628.347461 global_time:1944, event:`SYSCALL: wait4' (state:EXITING_SYSCALL) tid:42306, ticks:21031
rax:0x0 rbx:0x7d81a05fffa0 rcx:0xffffffffffffffff rdx:0x1 rsi:0x7ffd9986fff4 rdi:0xffffffff rbp:0x7ffd99870080 rsp:0x7d81a05ffdb0 r8:0x8 r9:0x7d81a938b380 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x3d r15:0x62b748eda2b8 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x3d fs_base:0x7d81a90f0d00 gs_base:0x0
  { tid:42306, addr:0x7ffd9986fff4, length:0x4 }
}
{
  real_time:7628.347543 global_time:1945, event:`SYSCALLBUF_FLUSH' tid:42306, ticks:21079
  { syscall:'ppoll', ret:0x0, size:0x20 }
}
{
  real_time:7628.347574 global_time:1946, event:`SYSCALL: ppoll' (state:ENTERING_SYSCALL) tid:42306, ticks:21079
rax:0xffffffffffffffda rbx:0x7d81a05fffa0 rcx:0xffffffffffffffff rdx:0x7ffd9986ff00 rsi:0x2 rdi:0x62b748f11180 rbp:0x7ffd9986ff01 rsp:0x7d81a05ffd60 r8:0x8 r9:0x7d81a938b380 r10:0x0 r11:0x246 r12:0x0 r13:0x70104000 r14:0x0 r15:0x70104040 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x10f fs_base:0x7d81a90f0d00 gs_base:0x0
}
{
  real_time:7628.347588 global_time:1947, event:`SYSCALLBUF_RESET' tid:42306, ticks:21079
}
{
  real_time:7628.962502 global_time:1948, event:`SYSCALL: epoll_pwait2' (state:EXITING_SYSCALL) tid:42307, ticks:33841
rax:0x1 rbx:0x7d81a03fffa0 rcx:0xffffffffffffffff rdx:0x20 rsi:0x62b776b6c950 rdi:0x10 rbp:0x7ffd9986fe00 rsp:0x7d81a03ffd70 r8:0x0 r9:0x8 r10:0x0 r11:0x246 r12:0x70204030 r13:0x70204000 r14:0x0 r15:0x0 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x1b9 fs_base:0x7d81a90f0d00 gs_base:0x0
  { tid:42307, addr:0x62b776b6c950, length:0xc }
}
{
  real_time:7628.962637 global_time:1949, event:`GROW_MAP' tid:42307, ticks:34102
  { map_file:"<ZERO>", addr:0x7ffd99830000, length:0x10000, prot_flags:"rw-p", file_offset:0x0, device:0, inode:0, data_file:"", data_offset:0x0, file_size:0x10000 }
}
{
  real_time:7628.962683 global_time:1950, event:`SYSCALLBUF_FLUSH' tid:42307, ticks:34875
  { syscall:'clock_gettime', ret:0x0, size:0x20 }
  { syscall:'gettimeofday', ret:0x0, size:0x20 }
}
{
  real_time:7628.962688 global_time:1951, event:`SYSCALL: sendto' (state:ENTERING_SYSCALL) tid:42307, ticks:34875
rax:0xffffffffffffffda rbx:0x7d81a03fffa0 rcx:0xffffffffffffffff rdx:0x0 rsi:0x0 rdi:0xc rbp:0x0 rsp:0x7d81a03ffd80 r8:0x0 r9:0x0 r10:0x40 r11:0x246 r12:0x0 r13:0x0 r14:0xc r15:0x40 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x2c fs_base:0x7d81a90f0d00 gs_base:0x0
}
{
  real_time:7628.962692 global_time:1952, event:`SYSCALLBUF_RESET' tid:42307, ticks:34875
}
=== Start rr backtrace:
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr15emergency_debugEPNS_4TaskE+0x1f8) [0x6212d0a7e118]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr21EmergencyDebugOstreamD1Ev+0x556) [0x6212d0a84936]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr10ReplayTask13validate_regsEj+0x48a) [0x6212d0b4b11a]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr13ReplaySession13enter_syscallEPNS_10ReplayTaskERKNS0_15StepConstraintsE+0x8e9) [0x6212d0b2e709]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr13ReplaySession11replay_stepERKNS0_15StepConstraintsE+0x27c) [0x6212d0b37c5c]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr14ReplayTimeline19replay_step_forwardENS_10RunCommandE+0x94) [0x6212d0b68274]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr9GdbServer14debug_one_stepERNS_10GdbRequestE+0x1008) [0x6212d0a65d18]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr9GdbServer12serve_replayESt10shared_ptrINS_13ReplaySessionEERKNS0_6TargetEPVbRKNS0_15ConnectionFlagsE+0x9db) [0x6212d0a6747b]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr13ReplayCommand3runERSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaIS7_EE+0x21f9) [0x6212d0b283c9]
/home/mozzie/repos/rr/obj/bin/rr(main+0x37e) [0x6212d0a8cb4e]
/usr/lib/libc.so.6(+0x25e08) [0x75ca24945e08]
/usr/lib/libc.so.6(__libc_start_main+0x8c) [0x75ca24945ecc]
/home/mozzie/repos/rr/obj/bin/rr(_start+0x25) [0x6212d09f05e5]
=== End rr backtrace
Launch debugger with
  'gdb' '-l' '10000' '-ex' 'set sysroot /' '-ex' 'target extended-remote 127.0.0.1:42451' '/root/.local/share/rr/nsd-43/mmap_clone_5_nsd'
Other traces

When trying to find a minimal example the code breaks on write when using printf.

[FATAL src/ReplaySession.cc:1247:check_ticks_consistency()]
 (task 21412 (rec:21103) at time 411)
 -> Assertion `ticks_now == trace_ticks' failed to hold. ticks mismatch for 'SYSCALL: write'; expected 205404, got 205393
Tail of trace dump:
{
  real_time:4069.461559 global_time:391, event:`SYSCALL: getuid' (state:EXITING_SYSCALL) tid:21103, ticks:202565
rax:0x0 rbx:0x7fffcd7e9a18 rcx:0xffffffffffffffff rdx:0x8 rsi:0x0 rdi:0x711401f43391 rbp:0x7fffcd7e1640 rsp:0x7fffcd7e1628 r8:0x711401f1cc4f r9:0x582e97caa4a0 r10:0x0 r11:0x246 r12:0x1 r13:0x0 r14:0x711402064000 r15:0x582e7e75eda8 rip:0x711401de0f9b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x66 fs_base:0x711401be0540 gs_base:0x0
}
{
  real_time:4069.461588 global_time:392, event:`SYSCALLBUF_FLUSH' tid:21103, ticks:204146
  { syscall:'geteuid', ret:0x0, size:0x10 }
  { syscall:'getgid', ret:0x0, size:0x10 }
  { syscall:'getegid', ret:0x0, size:0x10 }
}
{
  real_time:4069.461607 global_time:393, event:`PATCH_SYSCALL' tid:21103, ticks:204146
rax:0xe9 rbx:0x582e97cad1d8 rcx:0xffffffffffffffff rdx:0x5 rsi:0x1 rdi:0x6 rbp:0x7fffcd7e1500 rsp:0x7fffcd7e1478 r8:0x582e97cad2d0 r9:0x711401f1f2b3 r10:0x7fffcd7e14bc r11:0x246 r12:0x1 r13:0x0 r14:0x711402064000 r15:0x582e7e75eda8 rip:0x711401e114cc eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xffffffffffffffff fs_base:0x711401be0540 gs_base:0x0
  { tid:21103, addr:0x711401fd76fa, length:0x5e }
  { tid:21103, addr:0x711401e114cc, length:0x8 }
}
{
  real_time:4069.461610 global_time:394, event:`SYSCALLBUF_RESET' tid:21103, ticks:204146
}
{
  real_time:4069.461630 global_time:395, event:`SYSCALL: epoll_ctl' (state:ENTERING_SYSCALL) tid:21103, ticks:204153
rax:0xffffffffffffffda rbx:0x681fffa0 rcx:0xffffffffffffffff rdx:0x5 rsi:0x1 rdi:0x6 rbp:0x7fffcd7e1500 rsp:0x681ffdb0 r8:0x582e97cad2d0 r9:0x711401f1f2b3 r10:0x7fffcd7e14bc r11:0x246 r12:0x1 r13:0x0 r14:0xe9 r15:0x582e7e75eda8 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xe9 fs_base:0x711401be0540 gs_base:0x0
}
{
  real_time:4069.461647 global_time:396, event:`SYSCALL: epoll_ctl' (state:EXITING_SYSCALL) tid:21103, ticks:204153
rax:0x0 rbx:0x681fffa0 rcx:0xffffffffffffffff rdx:0x5 rsi:0x1 rdi:0x6 rbp:0x7fffcd7e1500 rsp:0x681ffdb0 r8:0x582e97cad2d0 r9:0x711401f1f2b3 r10:0x7fffcd7e14bc r11:0x246 r12:0x1 r13:0x0 r14:0xe9 r15:0x582e7e75eda8 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xe9 fs_base:0x711401be0540 gs_base:0x0
}
{
  real_time:4069.461672 global_time:397, event:`SYSCALLBUF_FLUSH' tid:21103, ticks:204604
  { syscall:'fstat', ret:0x0, size:0xa0 }
}
{
  real_time:4069.461691 global_time:398, event:`PATCH_SYSCALL' tid:21103, ticks:204604
rax:0x1 rbx:0xe rcx:0xffffffffffffffff rdx:0xe rsi:0x582e97caa960 rdi:0x1 rbp:0x7fffcd7e1600 rsp:0x7fffcd7e15d8 r8:0x410 r9:0x1 r10:0x3 r11:0x246 r12:0xe r13:0x582e97caa960 r14:0x711401edf5c0 r15:0x711401edcea0 rip:0x711401e037a2 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xffffffffffffffff fs_base:0x711401be0540 gs_base:0x0
  { tid:21103, addr:0x711401fd7758, length:0x5e }
  { tid:21103, addr:0x711401e037a2, length:0x8 }
}
{
  real_time:4069.461694 global_time:399, event:`SYSCALLBUF_RESET' tid:21103, ticks:204604
}
{
  real_time:4069.461715 global_time:400, event:`SYSCALL: write' (state:ENTERING_SYSCALL) tid:21103, ticks:204619
rax:0xffffffffffffffda rbx:0x681fffa0 rcx:0xffffffffffffffff rdx:0xe rsi:0x582e97caa960 rdi:0x1 rbp:0x7fffcd7e1600 rsp:0x681ffd90 r8:0x410 r9:0x1 r10:0x3 r11:0x246 r12:0x0 r13:0x1 r14:0x582e97caa960 r15:0xe rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x1 fs_base:0x711401be0540 gs_base:0x0
}
{
  real_time:4069.461735 global_time:401, event:`SYSCALL: write' (state:EXITING_SYSCALL) tid:21103, ticks:204619
rax:0xe rbx:0x681fffa0 rcx:0xffffffffffffffff rdx:0xe rsi:0x582e97caa960 rdi:0x1 rbp:0x7fffcd7e1600 rsp:0x681ffd90 r8:0x410 r9:0x1 r10:0x3 r11:0x246 r12:0x0 r13:0x1 r14:0x582e97caa960 r15:0xe rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x1 fs_base:0x711401be0540 gs_base:0x0
}
{
  real_time:4069.461775 global_time:402, event:`PATCH_SYSCALL' tid:21103, ticks:204907
rax:0x1b9 rbx:0x7fffcd7e9a18 rcx:0xffffffffffffffff rdx:0x20 rsi:0x582e97cad000 rdi:0x6 rbp:0x7fffcd7e1660 rsp:0x7fffcd7e15f8 r8:0x0 r9:0x8 r10:0x0 r11:0x246 r12:0x1 r13:0x0 r14:0x711402064000 r15:0x582e7e75eda8 rip:0x711401e107bb eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xffffffffffffffff fs_base:0x711401be0540 gs_base:0x0
  { tid:21103, addr:0x711401fd77b6, length:0x5e }
  { tid:21103, addr:0x711401e107bb, length:0x8 }
}
{
  real_time:4069.461794 global_time:403, event:`SYSCALLBUF_FLUSH' tid:21103, ticks:204925
  { syscall:'epoll_pwait2', ret:0x0, size:0x10 }
}
{
  real_time:4069.461798 global_time:404, event:`SYSCALL: epoll_pwait2' (state:ENTERING_SYSCALL) tid:21103, ticks:204925
rax:0xffffffffffffffda rbx:0x681fffa0 rcx:0xffffffffffffffff rdx:0x20 rsi:0x582e97cad000 rdi:0x6 rbp:0x7fffcd7e1600 rsp:0x681ffd70 r8:0x0 r9:0x8 r10:0x0 r11:0x246 r12:0x70002030 r13:0x70002000 r14:0x0 r15:0x0 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x1b9 fs_base:0x711401be0540 gs_base:0x0
}
{
  real_time:4069.461801 global_time:405, event:`SYSCALLBUF_RESET' tid:21103, ticks:204925
}
{
  real_time:4070.645872 global_time:406, event:`SYSCALL: epoll_pwait2' (state:EXITING_SYSCALL) tid:21103, ticks:204925
rax:0x1 rbx:0x681fffa0 rcx:0xffffffffffffffff rdx:0x20 rsi:0x582e97cad000 rdi:0x6 rbp:0x7fffcd7e1600 rsp:0x681ffd70 r8:0x0 r9:0x8 r10:0x0 r11:0x246 r12:0x70002030 r13:0x70002000 r14:0x0 r15:0x0 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x1b9 fs_base:0x711401be0540 gs_base:0x0
  { tid:21103, addr:0x582e97cad000, length:0xc }
}
{
  real_time:4070.645971 global_time:407, event:`SYSCALLBUF_FLUSH' tid:21103, ticks:205130
  { syscall:'clock_gettime', ret:0x0, size:0x20 }
  { syscall:'gettimeofday', ret:0x0, size:0x20 }
}
{
  real_time:4070.645982 global_time:408, event:`SYSCALL: write' (state:ENTERING_SYSCALL) tid:21103, ticks:205130
rax:0xffffffffffffffda rbx:0x681fffa0 rcx:0xffffffffffffffff rdx:0x14 rsi:0x582e97caa960 rdi:0x1 rbp:0x7fffcd7e13d0 rsp:0x681ffd90 r8:0x582e7e75b557 r9:0x8 r10:0x0 r11:0x246 r12:0x0 r13:0x1 r14:0x582e97caa960 r15:0x14 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x1 fs_base:0x711401be0540 gs_base:0x0
}
{
  real_time:4070.645992 global_time:409, event:`SYSCALLBUF_RESET' tid:21103, ticks:205130
}
{
  real_time:4070.646042 global_time:410, event:`SYSCALL: write' (state:EXITING_SYSCALL) tid:21103, ticks:205130
rax:0x14 rbx:0x681fffa0 rcx:0xffffffffffffffff rdx:0x14 rsi:0x582e97caa960 rdi:0x1 rbp:0x7fffcd7e13d0 rsp:0x681ffd90 r8:0x582e7e75b557 r9:0x8 r10:0x0 r11:0x246 r12:0x0 r13:0x1 r14:0x582e97caa960 r15:0x14 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x1 fs_base:0x711401be0540 gs_base:0x0
}
{
  real_time:4070.646099 global_time:411, event:`SYSCALL: write' (state:ENTERING_SYSCALL) tid:21103, ticks:205404
rax:0xffffffffffffffda rbx:0x681fffa0 rcx:0xffffffffffffffff rdx:0x10 rsi:0x582e97caa960 rdi:0x1 rbp:0x7fffcd7e13c0 rsp:0x681ffd90 r8:0x64 r9:0xffffffff r10:0x0 r11:0x246 r12:0x0 r13:0x1 r14:0x582e97caa960 r15:0x10 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x1 fs_base:0x711401be0540 gs_base:0x0
}
{
  real_time:4070.646142 global_time:412, event:`SYSCALL: write' (state:EXITING_SYSCALL) tid:21103, ticks:205404
rax:0x10 rbx:0x681fffa0 rcx:0xffffffffffffffff rdx:0x10 rsi:0x582e97caa960 rdi:0x1 rbp:0x7fffcd7e13c0 rsp:0x681ffd90 r8:0x64 r9:0xffffffff r10:0x0 r11:0x246 r12:0x0 r13:0x1 r14:0x582e97caa960 r15:0x10 rip:0x70000002 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x1 fs_base:0x711401be0540 gs_base:0x0
}
=== Start rr backtrace:
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr15emergency_debugEPNS_4TaskE+0x1f8) [0x5a576e510118]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr21EmergencyDebugOstreamD1Ev+0x556) [0x5a576e516936]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr13ReplaySession23check_ticks_consistencyEPNS_10ReplayTaskERKNS_5EventE+0x175) [0x5a576e5c4815]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr13ReplaySession11replay_stepERKNS0_15StepConstraintsE+0x715) [0x5a576e5ca0f5]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr14ReplayTimeline19replay_step_forwardENS_10RunCommandE+0x94) [0x5a576e5fa274]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr9GdbServer14debug_one_stepERNS_10GdbRequestE+0x1008) [0x5a576e4f7d18]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr9GdbServer12serve_replayESt10shared_ptrINS_13ReplaySessionEERKNS0_6TargetEPVbRKNS0_15ConnectionFlagsE+0x9db) [0x5a576e4f947b]
/home/mozzie/repos/rr/obj/bin/rr(_ZN2rr13ReplayCommand3runERSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaIS7_EE+0x21f9) [0x5a576e5ba3c9]
/home/mozzie/repos/rr/obj/bin/rr(main+0x37e) [0x5a576e51eb4e]
/usr/lib/libc.so.6(+0x25e08) [0x7d78e2634e08]
/usr/lib/libc.so.6(__libc_start_main+0x8c) [0x7d78e2634ecc]
/home/mozzie/repos/rr/obj/bin/rr(_start+0x25) [0x5a576e4825e5]
=== End rr backtrace
Launch debugger with
  'gdb' '-l' '10000' '-ex' 'set sysroot /' '-ex' 'target extended-remote 127.0.0.1:21412' '/root/.local/share/rr/epoll-13/mmap_clone_5_epoll'

When recording the original program with --no-syscall-buffer it still breaks at epoll_pwait2.

[FATAL src/ReplaySession.cc:696:enter_syscall()] 
 (task 264753 (rec:258730) at time 35079)
 -> Assertion `false' failed to hold. Expected syscall_bp_vm to be clear but it's 258730's address space with a breakpoint at 0x71acb9eb9895 while we're at 0x71acb9eb77bd
Tail of trace dump:
{
  real_time:62166.717326 global_time:35059, event:`SYSCALL: brk' (state:ENTERING_SYSCALL) tid:258730, ticks:27466
rax:0xffffffffffffffda rbx:0x59fc6f831000 rcx:0xffffffffffffffff rdx:0x0 rsi:0x71acb9f85ac0 rdi:0x59fc6f831000 rbp:0x7ffcdabc52f0 rsp:0x7ffcdabc52c8 r8:0x0 r9:0x1 r10:0x59fc6f80c730 r11:0x246 r12:0x59fc6f810000 r13:0x71acb9f8cd90 r14:0x1000 r15:0x21000 rip:0x71acb9eab86b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xc fs_base:0x71acb9c88d00 gs_base:0x0
}
{
  real_time:62166.717361 global_time:35060, event:`SYSCALL: brk' (state:EXITING_SYSCALL) tid:258730, ticks:27466
rax:0x59fc6f831000 rbx:0x59fc6f831000 rcx:0xffffffffffffffff rdx:0x0 rsi:0x71acb9f85ac0 rdi:0x59fc6f831000 rbp:0x7ffcdabc52f0 rsp:0x7ffcdabc52c8 r8:0x0 r9:0x1 r10:0x59fc6f80c730 r11:0x246 r12:0x59fc6f810000 r13:0x71acb9f8cd90 r14:0x1000 r15:0x21000 rip:0x71acb9eab86b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xc fs_base:0x71acb9c88d00 gs_base:0x0
  { map_file:"<ZERO>", addr:0x59fc6f810000, length:0x21000, prot_flags:"rw-p", file_offset:0x0, device:0, inode:0, data_file:"", data_offset:0x0, file_size:0x21000 }
}
{
  real_time:62166.717401 global_time:35061, event:`SYSCALL: brk' (state:ENTERING_SYSCALL) tid:258730, ticks:29270
rax:0xffffffffffffffda rbx:0x59fc6f852000 rcx:0xffffffffffffffff rdx:0x0 rsi:0x71acb9f85ac0 rdi:0x59fc6f852000 rbp:0x7ffcdabc52f0 rsp:0x7ffcdabc52c8 r8:0x0 r9:0x1 r10:0x59fc6f82d6b0 r11:0x246 r12:0x59fc6f831000 r13:0x71acb9f8cd90 r14:0x1000 r15:0x21000 rip:0x71acb9eab86b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xc fs_base:0x71acb9c88d00 gs_base:0x0
}
{
  real_time:62166.717435 global_time:35062, event:`SYSCALL: brk' (state:EXITING_SYSCALL) tid:258730, ticks:29270
rax:0x59fc6f852000 rbx:0x59fc6f852000 rcx:0xffffffffffffffff rdx:0x0 rsi:0x71acb9f85ac0 rdi:0x59fc6f852000 rbp:0x7ffcdabc52f0 rsp:0x7ffcdabc52c8 r8:0x0 r9:0x1 r10:0x59fc6f82d6b0 r11:0x246 r12:0x59fc6f831000 r13:0x71acb9f8cd90 r14:0x1000 r15:0x21000 rip:0x71acb9eab86b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xc fs_base:0x71acb9c88d00 gs_base:0x0
  { map_file:"<ZERO>", addr:0x59fc6f831000, length:0x21000, prot_flags:"rw-p", file_offset:0x0, device:0, inode:0, data_file:"", data_offset:0x0, file_size:0x21000 }
}
{
  real_time:62166.717477 global_time:35063, event:`SYSCALL: brk' (state:ENTERING_SYSCALL) tid:258730, ticks:31074
rax:0xffffffffffffffda rbx:0x59fc6f873000 rcx:0xffffffffffffffff rdx:0x0 rsi:0x71acb9f85ac0 rdi:0x59fc6f873000 rbp:0x7ffcdabc52f0 rsp:0x7ffcdabc52c8 r8:0x0 r9:0x1 r10:0x59fc6f84e630 r11:0x246 r12:0x59fc6f852000 r13:0x71acb9f8cd90 r14:0x1000 r15:0x21000 rip:0x71acb9eab86b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xc fs_base:0x71acb9c88d00 gs_base:0x0
}
{
  real_time:62166.717512 global_time:35064, event:`SYSCALL: brk' (state:EXITING_SYSCALL) tid:258730, ticks:31074
rax:0x59fc6f873000 rbx:0x59fc6f873000 rcx:0xffffffffffffffff rdx:0x0 rsi:0x71acb9f85ac0 rdi:0x59fc6f873000 rbp:0x7ffcdabc52f0 rsp:0x7ffcdabc52c8 r8:0x0 r9:0x1 r10:0x59fc6f84e630 r11:0x246 r12:0x59fc6f852000 r13:0x71acb9f8cd90 r14:0x1000 r15:0x21000 rip:0x71acb9eab86b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xc fs_base:0x71acb9c88d00 gs_base:0x0
  { map_file:"<ZERO>", addr:0x59fc6f852000, length:0x21000, prot_flags:"rw-p", file_offset:0x0, device:0, inode:0, data_file:"", data_offset:0x0, file_size:0x21000 }
}
{
  real_time:62166.717562 global_time:35065, event:`SYSCALL: epoll_pwait2' (state:ENTERING_SYSCALL) tid:258730, ticks:33357
rax:0xffffffffffffffda rbx:0x59fc6f61e750 rcx:0xffffffffffffffff rdx:0x20 rsi:0x59fc6f69e9a0 rdi:0x10 rbp:0x7ffcdabc5490 rsp:0x7ffcdabc5428 r8:0x0 r9:0x8 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9eb77bd eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x1b9 fs_base:0x71acb9c88d00 gs_base:0x0
}
{
  real_time:62167.717297 global_time:35066, event:`SYSCALL: ppoll' (state:EXITING_SYSCALL) tid:258729, ticks:19309
rax:0x0 rbx:0x71acba64b000 rcx:0xffffffffffffffff rdx:0x7ffcdabc5590 rsi:0x2 rdi:0x59fc333ee180 rbp:0x7ffcdabc55c0 rsp:0x7ffcdabc5570 r8:0x8 r9:0x71acba6c2380 r10:0x0 r11:0x246 r12:0x2 r13:0x7ffcdabc5590 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9ea9b5b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x10f fs_base:0x71acb9c88d00 gs_base:0x0
  { tid:258729, addr:0x7ffcdabc5590, length:0x10 }
  { tid:258729, addr:0x59fc333ee180, length:0x10 }
}
{
  real_time:62167.717468 global_time:35067, event:`SYSCALL: wait4' (state:ENTERING_SYSCALL) tid:258729, ticks:19329
rax:0xffffffffffffffda rbx:0x71acba64b000 rcx:0xffffffffffffffff rdx:0x1 rsi:0x7ffcdabc5684 rdi:0xffffffff rbp:0x7ffcdabc5710 rsp:0x7ffcdabc5668 r8:0x8 r9:0x71acba6c2380 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9e9fa87 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x3d fs_base:0x71acb9c88d00 gs_base:0x0
}
{
  real_time:62167.717549 global_time:35068, event:`SYSCALL: wait4' (state:EXITING_SYSCALL) tid:258729, ticks:19329
rax:0x0 rbx:0x71acba64b000 rcx:0xffffffffffffffff rdx:0x1 rsi:0x7ffcdabc5684 rdi:0xffffffff rbp:0x7ffcdabc5710 rsp:0x7ffcdabc5668 r8:0x8 r9:0x71acba6c2380 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9e9fa87 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x3d fs_base:0x71acb9c88d00 gs_base:0x0
  { tid:258729, addr:0x7ffcdabc5684, length:0x4 }
}
{
  real_time:62167.717642 global_time:35069, event:`SYSCALL: ppoll' (state:ENTERING_SYSCALL) tid:258729, ticks:19353
rax:0xffffffffffffffda rbx:0x71acba64b000 rcx:0xffffffffffffffff rdx:0x7ffcdabc5590 rsi:0x2 rdi:0x59fc333ee180 rbp:0x7ffcdabc55c0 rsp:0x7ffcdabc5570 r8:0x8 r9:0x71acba6c2380 r10:0x0 r11:0x246 r12:0x2 r13:0x7ffcdabc5590 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9ea9b5b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x10f fs_base:0x71acb9c88d00 gs_base:0x0
}
{
  real_time:62168.719234 global_time:35070, event:`SYSCALL: ppoll' (state:EXITING_SYSCALL) tid:258729, ticks:19353
rax:0x0 rbx:0x71acba64b000 rcx:0xffffffffffffffff rdx:0x7ffcdabc5590 rsi:0x2 rdi:0x59fc333ee180 rbp:0x7ffcdabc55c0 rsp:0x7ffcdabc5570 r8:0x8 r9:0x71acba6c2380 r10:0x0 r11:0x246 r12:0x2 r13:0x7ffcdabc5590 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9ea9b5b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x10f fs_base:0x71acb9c88d00 gs_base:0x0
  { tid:258729, addr:0x7ffcdabc5590, length:0x10 }
  { tid:258729, addr:0x59fc333ee180, length:0x10 }
}
{
  real_time:62168.719389 global_time:35071, event:`SYSCALL: wait4' (state:ENTERING_SYSCALL) tid:258729, ticks:19373
rax:0xffffffffffffffda rbx:0x71acba64b000 rcx:0xffffffffffffffff rdx:0x1 rsi:0x7ffcdabc5684 rdi:0xffffffff rbp:0x7ffcdabc5710 rsp:0x7ffcdabc5668 r8:0x8 r9:0x71acba6c2380 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9e9fa87 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x3d fs_base:0x71acb9c88d00 gs_base:0x0
}
{
  real_time:62168.719470 global_time:35072, event:`SYSCALL: wait4' (state:EXITING_SYSCALL) tid:258729, ticks:19373
rax:0x0 rbx:0x71acba64b000 rcx:0xffffffffffffffff rdx:0x1 rsi:0x7ffcdabc5684 rdi:0xffffffff rbp:0x7ffcdabc5710 rsp:0x7ffcdabc5668 r8:0x8 r9:0x71acba6c2380 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9e9fa87 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x3d fs_base:0x71acb9c88d00 gs_base:0x0
  { tid:258729, addr:0x7ffcdabc5684, length:0x4 }
}
{
  real_time:62168.719564 global_time:35073, event:`SYSCALL: ppoll' (state:ENTERING_SYSCALL) tid:258729, ticks:19397
rax:0xffffffffffffffda rbx:0x71acba64b000 rcx:0xffffffffffffffff rdx:0x7ffcdabc5590 rsi:0x2 rdi:0x59fc333ee180 rbp:0x7ffcdabc55c0 rsp:0x7ffcdabc5570 r8:0x8 r9:0x71acba6c2380 r10:0x0 r11:0x246 r12:0x2 r13:0x7ffcdabc5590 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9ea9b5b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x10f fs_base:0x71acb9c88d00 gs_base:0x0
}
{
  real_time:62169.345501 global_time:35074, event:`SYSCALL: epoll_pwait2' (state:EXITING_SYSCALL) tid:258730, ticks:33357
rax:0x1 rbx:0x59fc6f61e750 rcx:0xffffffffffffffff rdx:0x20 rsi:0x59fc6f69e9a0 rdi:0x10 rbp:0x7ffcdabc5490 rsp:0x7ffcdabc5428 r8:0x0 r9:0x8 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9eb77bd eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x1b9 fs_base:0x71acb9c88d00 gs_base:0x0
  { tid:258730, addr:0x59fc6f69e9a0, length:0xc }
}
{
  real_time:62169.345615 global_time:35075, event:`SYSCALL: clock_gettime' (state:ENTERING_SYSCALL) tid:258730, ticks:33400
rax:0xffffffffffffffda rbx:0x59fc6f61e750 rcx:0xffffffffffffffff rdx:0x7ffcdabc5410 rsi:0x7ffcdabc5410 rdi:0x6 rbp:0x7ffcdabc53f0 rsp:0x7ffcdabc53e8 r8:0x0 r9:0x8 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x6ffff05b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xe4 fs_base:0x71acb9c88d00 gs_base:0x0
}
{
  real_time:62169.345661 global_time:35076, event:`SYSCALL: clock_gettime' (state:EXITING_SYSCALL) tid:258730, ticks:33400
rax:0x0 rbx:0x59fc6f61e750 rcx:0xffffffffffffffff rdx:0x7ffcdabc5410 rsi:0x7ffcdabc5410 rdi:0x6 rbp:0x7ffcdabc53f0 rsp:0x7ffcdabc53e8 r8:0x0 r9:0x8 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x6ffff05b eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0xe4 fs_base:0x71acb9c88d00 gs_base:0x0
  { tid:258730, addr:0x7ffcdabc5410, length:0x10 }
}
{
  real_time:62169.345710 global_time:35077, event:`SYSCALL: gettimeofday' (state:ENTERING_SYSCALL) tid:258730, ticks:33405
rax:0xffffffffffffffda rbx:0x59fc6f61e750 rcx:0xffffffffffffffff rdx:0xf2d6 rsi:0x0 rdi:0x7ffcdabc5450 rbp:0x7ffcdabc5470 rsp:0x7ffcdabc5438 r8:0x0 r9:0x8 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x6ffff068 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x60 fs_base:0x71acb9c88d00 gs_base:0x0
}
{
  real_time:62169.345746 global_time:35078, event:`SYSCALL: gettimeofday' (state:EXITING_SYSCALL) tid:258730, ticks:33405
rax:0x0 rbx:0x59fc6f61e750 rcx:0xffffffffffffffff rdx:0xf2d6 rsi:0x0 rdi:0x7ffcdabc5450 rbp:0x7ffcdabc5470 rsp:0x7ffcdabc5438 r8:0x0 r9:0x8 r10:0x0 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x6ffff068 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x60 fs_base:0x71acb9c88d00 gs_base:0x0
  { tid:258730, addr:0x7ffcdabc5450, length:0x10 }
}
{
  real_time:62169.346101 global_time:35079, event:`SYSCALL: sendto' (state:ENTERING_SYSCALL) tid:258730, ticks:70560
rax:0xffffffffffffffda rbx:0x0 rcx:0xffffffffffffffff rdx:0x0 rsi:0x0 rdi:0xc rbp:0x7ffcdabc51b0 rsp:0x7ffcdabc5118 r8:0x0 r9:0x0 r10:0x40 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9eb9897 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x2c fs_base:0x71acb9c88d00 gs_base:0x0
}
{
  real_time:62169.346260 global_time:35080, event:`SYSCALL: sendto' (state:EXITING_SYSCALL) tid:258730, ticks:70560
rax:0xfffffffffffffff5 rbx:0x0 rcx:0xffffffffffffffff rdx:0x0 rsi:0x0 rdi:0xc rbp:0x7ffcdabc51b0 rsp:0x7ffcdabc5118 r8:0x0 r9:0x0 r10:0x40 r11:0x246 r12:0x2 r13:0x0 r14:0x71acba6c4000 r15:0x59fc333b72b8 rip:0x71acb9eb9897 eflags:0x246 cs:0x33 ss:0x2b ds:0x0 es:0x0 fs:0x0 gs:0x0 orig_rax:0x2c fs_base:0x71acb9c88d00 gs_base:0x0
}
[FATAL src/log.cc:512:start_emergency_debug()] (session doesn't look interactive, aborting emergency debugging)
Remote connection closed
No stack.

@khuey
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khuey commented Sep 20, 2024

What CPU are you running on?

@mozzieongit
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AMD Ryzen 7 7840U w/ Radeon 780M Graphics. Zen workaround is in place and kernel.perf_event_paranoid = 1.

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