syzbot


kernel panic: Damn Damn! Unhandled trap in the kernel! (4)

Status: fixed on 2019/05/09 14:48
Reported-by: syzbot+a20f4107d5ec7009c1c4@syzkaller.appspotmail.com
Fix commit: 299f4b5e23e3 event: fix divide by 0 in send_event()
First crash: 2029d, last: 2025d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
akaros kernel panic: Damn Damn! Unhandled trap in the kernel! (5) syz 41 1342d 1960d 0/1 upstream: reported syz repro on 2019/07/12 04:31
akaros kernel panic: Damn Damn! Unhandled trap in the kernel! C 97385 2052d 2321d 1/1 fixed on 2019/04/11 01:13
akaros kernel panic: Damn Damn! Unhandled trap in the kernel! (3) C 3 2031d 2031d 1/1 fixed on 2019/05/02 02:02
akaros kernel panic: Damn Damn! Unhandled trap in the kernel! (2) C 2 2039d 2039d 1/1 fixed on 2019/04/30 00:21

Sample crash report:
kernel panic at kern/arch/x86/trap.c:628, from core 0: Damn Damn!  Unhandled trap in the kernel!
HW TRAP frame at 0xfffffff0000527b0 on core 0
  rax  0x0000000000000006
  rbx  0xffff80000218b900
  rcx  0x00000000000000c5
  rdx  0x0000000000000000
  rbp  0xfffffff0000528c8
  rsi  0xffff800003b39000
  rdi  0xffff80000218b900
  r8   0x0000000000000000
  r9   0x0000000000000000
  r10  0x0000000000000054
  r11  0xffff800004da117c
  r12  0x0000000020001700
  r13  0x0000000000000005
  r14  0xfffffff000052910
  r15  0xffff80000218d001
  trap 0x00000000 Divide error
  gsbs 0xffffffffc8e37b00
  fsbs 0x0000000000000000
  err  0x--------00000000
  rip  0xffffffffc200758d
  cs   0x------------0008
  flag 0x0000000000010206
  rsp  0xfffffff000052878
  ss   0x------------0000
Backtrace of kernel context on Core 0:
#01 [<0xffffffffc200758d>] in send_event at src/event.c:393
#02 [<0xffffffffc2008074>] in fire_tap at src/fdtap.c:182
#03 [<0xffffffffc20161bb>] in fire_data_taps at src/net/devip.c:1560
#04 [<0xffffffffc201620a>] in ip_wake_cb at src/net/devip.c:1577
#05 [<     [inline]     >] in qwake_cb at src/ns/qio.c:113
#05 [<0xffffffffc203b5c7>] in __qbwrite at src/ns/qio.c:1566
#06 [<0xffffffffc203c4bb>] in qpassnolim at src/ns/qio.c:930
#07 [<0xffffffffc202ef41>] in tcpiput at src/net/tcp.c:2595
#08 [<0xffffffffc201e232>] in ipiput4 at src/net/ip.c:543
#09 [<0xffffffffc201a601>] in etherread4 at src/net/ethermedium.c:457
#10 [<0xffffffffc200b354>] in __ktask_wrapper at src/kthread.c:292
#11 [<0xffffffffc205bd0d>] in process_routine_kmsg at src/trap.c:241
#12 [<0xffffffffc20556ee>] in __smp_idle at src/smp.c:78

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/05/04 06:00 akaros d8ea787e7260 d28f4ce5 .config console log report syz ci-akaros-main
2019/05/08 07:41 akaros d8ea787e7260 a7383bfa .config console log report ci-akaros-main
2019/05/04 05:40 akaros d8ea787e7260 d28f4ce5 .config console log report ci-akaros-main
* Struck through repros no longer work on HEAD.