syzbot


BUG: sleeping function called from invalid context in task_work_run

Status: upstream: reported syz repro on 2024/02/18 17:15
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+c3aefa12e2773fdeb100@syzkaller.appspotmail.com
First crash: 127d, last: 127d
Bug presence (2)
Date Name Commit Repro Result
2024/02/18 linux-6.1.y (ToT) 8b4118fabd6e C [report] BUG: sleeping function called from invalid context in validate_mm
2024/02/18 upstream (ToT) 6c160f16be5d C Didn't crash
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2024/03/18 17:19 7h04m fix candidate upstream job log (1)

Sample crash report:
BUG: sleeping function called from invalid context at kernel/task_work.c:181
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3553, name: udevd
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
no locks held by udevd/3553.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 PID: 3553 Comm: udevd Not tainted 6.1.78-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 __might_resched+0x5cb/0x780 kernel/sched/core.c:9942
 task_work_run+0x26d/0x300 kernel/task_work.c:181
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f89fbd16ab9
Code: 00 00 00 44 8b 54 24 58 48 89 44 24 30 48 8d 44 24 40 48 89 44 24 38 64 8b 04 25 18 00 00 00 85 c0 75 21 b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 40 a3 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffd23e0f350 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: fffffffffffffffe RBX: 00007ffd23e114b0 RCX: 00007f89fbd16ab9
RDX: 0000000000080000 RSI: 00007f89fc235dd8 RDI: 000000000000000b
RBP: 0000562f8ff1e950 R08: 0000562f8ff10240 R09: 00007f89fbdf1b20
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000b
R13: 00007f89fc235dd8 R14: 0000000000080000 R15: 0000000000000001
 </TASK>
BUG: scheduling while atomic: udevd/3553/0x00000002
no locks held by udevd/3553.
Modules linked in:
Preemption disabled at:
[<0000000000000000>] 0x0

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/18 17:14 linux-6.1.y 8b4118fabd6e 578f7538 .config console log report syz [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf BUG: sleeping function called from invalid context in task_work_run
* Struck through repros no longer work on HEAD.