kernel panic: Damn Damn! Unhandled trap in the kernel! (5)

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syzbot

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Jul 12, 2019, 12:31:06 AM7/12/19
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Hello,

syzbot found the following crash on:

HEAD commit: 9855c4bd vmm: remove more verbose output
git tree: akaros
console output: https://syzkaller.appspot.com/x/log.txt?x=13d7a014600000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b018fab5edd31b3
dashboard link: https://syzkaller.appspot.com/bug?extid=f138fd45d068cdf1e42f

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+f138fd...@syzkaller.appspotmail.com

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 0x0000000000000007
rbx 0xffff800002178c00
rcx 0xffff8000084ef000
rdx 0x0000000000000000
rbp 0xfffffff0000528c8
rsi 0x00000000200000c0
rdi 0xffff800002178c00
r8 0x0000000000000000
r9 0x0000000000000000
r10 0x00000000000005b8
r11 0xffff8000152b06dc
r12 0x00000000200000c0
r13 0x0000000000000006
r14 0xfffffff000052910
r15 0xffff800002182a01
trap 0x00000000 Divide error
gsbs 0xffffffffc8e7cb00
fsbs 0x0000000000000000
err 0x--------00000000
rip 0xffffffffc20076ae
cs 0x------------0008
flag 0x0000000000010202
rsp 0xfffffff000052878
ss 0x------------0000
Backtrace of kernel context on Core 0:
#01 [<0xffffffffc20076ae>] in send_event at src/event.c:395
#02 [<0xffffffffc2008114>] in fire_tap at src/fdtap.c:182
#03 [<0xffffffffc20162ab>] in fire_data_taps at src/net/devip.c:1560
#04 [<0xffffffffc20162fa>] in ip_wake_cb at src/net/devip.c:1577
#05 [< [inline] >] in qwake_cb at src/ns/qio.c:103
#05 [<0xffffffffc203b947>] in __qbwrite at src/ns/qio.c:1497
#06 [<0xffffffffc203c64b>] in qpassnolim at src/ns/qio.c:922
#07 [<0xffffffffc202f061>] in tcpiput at src/net/tcp.c:2595
#08 [<0xffffffffc201e342>] in ipiput4 at src/net/ip.c:543
#09 [<0xffffffffc201a701>] in etherread4 at src/net/ethermedium.c:457
#10 [<0xffffffffc200b3f4>] in __ktask_wrapper at src/kthread.c:292
#11 [<0xffffffffc205b8fd>] in process_routine_kmsg at src/trap.c:241
#12 [<0xffffffffc205526e>] in __smp_idle at src/smp.c:78


---
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syzbot

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Jul 12, 2019, 12:52:06 AM7/12/19
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syzbot has found a reproducer for the following crash on:

HEAD commit: 9855c4bd vmm: remove more verbose output
git tree: akaros
console output: https://syzkaller.appspot.com/x/log.txt?x=120fbeffa00000
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164ece98600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+f138fd...@syzkaller.appspotmail.com

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 0x0000000000000007
rbx 0xffff800015766900
rcx 0xffff800015420000
rdx 0x0000000000000000
rbp 0xfffffff0000528c8
rsi 0x00000000200000c0
rdi 0xffff800015766900
r8 0x0000000000000000
r9 0x0000000000000000
r10 0x0000000000000000
r11 0xfffffff0000ebe90
r12 0x00000000200000c0
r13 0x0000000000000006
r14 0xfffffff000052910
r15 0xffff800015762d01
trap 0x00000000 Divide error
gsbs 0xffffffffc8e7cb00
fsbs 0x0000000000000000
err 0x--------00000000
rip 0xffffffffc20076ae
cs 0x------------0008
flag 0x0000000000010202
rsp 0xfffffff000052878
ss 0x------------0010
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