On 10/27/21 02:17, Hao Sun wrote:
Hello,
When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.
HEAD commit: 519d81956ee2 Linux 5.15-rc6
git tree: upstream
console output:
https://drive.google.com/file/d/13rSoYeSyLgYZ_8i4uYYH9hKWHmKh7wtl/view?usp=sharing
kernel config: https://drive.google.com/file/d/12PUnxIM1EPBgW4ZJmI7WJBRaY1lA83an/view?usp=sharing
Sorry, I don't have a reproducer for this crash, hope the symbolized
report can help.
If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@xxxxxxxxx>
This looks like a similar report with a repro sent by syzbot,
the problem is narrowed (tw + sleeping in coredump), under
discussion.
INFO: task syz-executor:8213 blocked for more than 143 seconds.
Not tainted 5.15.0-rc6 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:27784 pid: 8213 ppid: 7441 flags:0x00024004
Call Trace:
context_switch kernel/sched/core.c:4940 [inline]
__schedule+0xcd9/0x2530 kernel/sched/core.c:6287
schedule+0xd3/0x270 kernel/sched/core.c:6366
schedule_timeout+0x5e5/0x890 kernel/time/timer.c:1857
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x17d/0x280 kernel/sched/completion.c:138
io_wq_exit_workers fs/io-wq.c:1174 [inline]
io_wq_put_and_exit+0x44e/0xcc0 fs/io-wq.c:1209
io_uring_clean_tctx fs/io_uring.c:9718 [inline]
io_uring_cancel_generic+0x616/0x760 fs/io_uring.c:9798
io_uring_files_cancel include/linux/io_uring.h:16 [inline]
do_exit+0x25c/0x2dd0 kernel/exit.c:780
do_group_exit+0x125/0x340 kernel/exit.c:922
get_signal+0x4d5/0x25a0 kernel/signal.c:2868
arch_do_signal_or_restart+0x2ed/0x1c40 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x192/0x2a0 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6d07ffec4d
RSP: 002b:00007f6d05524c58 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 0000000000000100 RBX: 00007f6d08125210 RCX: 00007f6d07ffec4d
RDX: 0000000000000000 RSI: 000000000000450c RDI: 0000000000000005
RBP: 00007f6d08077d80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6d08125210
R13: 00007ffea7b3783f R14: 00007ffea7b379e0 R15: 00007f6d05524dc0
INFO: lockdep is turned off.
NMI backtrace for cpu 2
CPU: 2 PID: 39 Comm: khungtaskd Not tainted 5.15.0-rc6 #4
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1e1/0x220 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xcc8/0x1010 kernel/hung_task.c:295
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 2 to CPUs 0-1,3:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt
arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt
arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10
arch/x86/kernel/process.c:716
NMI backtrace for cpu 1 skipped: idling at native_safe_halt
arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt
arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10
arch/x86/kernel/process.c:716
NMI backtrace for cpu 3
CPU: 3 PID: 11026 Comm: syz-executor Not tainted 5.15.0-rc6 #4
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:__sanitizer_cov_trace_pc+0x1c/0x40 kernel/kcov.c:197
Code: 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 65 48 8b 0c 25 40 f0
01 00 bf 02 00 00 00 48 89 ce 4c 8b 04 24 e8 76 ff ff ff 84 c0 <74> 20
48 8b 91 20 15 00 00 8b 89 1c 15 00 00 48 8b 02 48 83 c0 01
RSP: 0018:ffffc9000573f8b8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 000000000000000b RCX: ffff8880318f1c80
RDX: 0000000000000000 RSI: ffff8880318f1c80 RDI: 0000000000000002
RBP: ffff8881038b0880 R08: ffffffff83a8fb86 R09: 0000000000000010
R10: 0000000000000001 R11: fffffbfff2078908 R12: 0000000000000010
R13: 0000000000000288 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000555557215940(0000) GS:ffff888135d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd2317ab68 CR3: 000000003196b000 CR4: 0000000000350ee0
Call Trace:
tomoyo_domain_quota_is_ok+0x2f6/0x540 security/tomoyo/util.c:1093
tomoyo_supervisor+0x290/0xe30 security/tomoyo/common.c:2089
tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
tomoyo_path_permission security/tomoyo/file.c:587 [inline]
tomoyo_path_permission+0x270/0x3a0 security/tomoyo/file.c:573
tomoyo_path_perm+0x2fc/0x420 security/tomoyo/file.c:838
tomoyo_path_unlink+0x8e/0xd0 security/tomoyo/tomoyo.c:149
security_path_unlink+0xd7/0x150 security/security.c:1155
do_unlinkat+0x369/0x660 fs/namei.c:4165
__do_sys_unlink fs/namei.c:4217 [inline]
__se_sys_unlink fs/namei.c:4215 [inline]
__x64_sys_unlink+0x3e/0x50 fs/namei.c:4215
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f1b1317153b
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66
2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 57 00 00 00 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd2317ab68 EFLAGS: 00000202 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000009d6e RCX: 00007f1b1317153b
RDX: 00007ffd2317ab98 RSI: 0000000040086602 RDI: 00007ffd2317ac30
RBP: 00007ffd2317ac30 R08: 0000000000000000 R09: 00007ffd2317a9f0
R10: 0000000000000000 R11: 0000000000000202 R12: 00007f1b131e9e46
R13: 00007ffd2317bcd0 R14: 000055555721ee50 R15: 0000000000000004
----------------
Code disassembly (best guess):
0: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
7: 00 00 00 00
b: 0f 1f 00 nopl (%rax)
e: 65 48 8b 0c 25 40 f0 mov %gs:0x1f040,%rcx
15: 01 00
17: bf 02 00 00 00 mov $0x2,%edi
1c: 48 89 ce mov %rcx,%rsi
1f: 4c 8b 04 24 mov (%rsp),%r8
23: e8 76 ff ff ff callq 0xffffff9e
28: 84 c0 test %al,%al
* 2a: 74 20 je 0x4c <-- trapping instruction
2c: 48 8b 91 20 15 00 00 mov 0x1520(%rcx),%rdx
33: 8b 89 1c 15 00 00 mov 0x151c(%rcx),%ecx
39: 48 8b 02 mov (%rdx),%rax
3c: 48 83 c0 01 add $0x1,%rax
--
Pavel Begunkov
