syzbot
general protection fault in try_to_wake_up (5)
Status:
moderation: reported on 2026/09/02 12:53
Subsystems:
kernel
[Documentation on labels]
Reported-by: syzbot+a8cff47a788a847f670a@syzkaller.appspotmail.com
First crash: 4d00h, last: 4d00h
Sample crash report:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000160: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000b00-0x0000000000000b07]
CPU: 1 UID: 0 PID: 29 Comm: ktimers/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210
Code: 79 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 c3 cc cc cc cc cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc90000a3f8f8 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: ffffffff8b58d998 RCX: 8000000000010003
RDX: 0000000000000000 RSI: ffffffff8b58d998 RDI: 0000000000000160
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f63b70 R12: 0000000000000b00
R13: 0000000000000000 R14: 0000000000000b00 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125cd6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f02e2535ff8 CR3: 00000000645d2000 CR4: 00000000003526f0
Call Trace:
<TASK>
__kasan_check_byte+0x12/0x40 mm/kasan/common.c:573
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire+0x7d/0x350 kernel/locking/lockdep.c:5882
__raw_spin_lock_irq_disable include/linux/spinlock_api_smp.h:174 [inline]
_raw_spin_lock_irq_disable+0x78/0x90 kernel/locking/spinlock.c:197
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:595 [inline]
try_to_wake_up+0x63/0x1430 kernel/sched/core.c:4302
call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2374 [inline]
__run_timer_base+0x67b/0x9b0 kernel/time/timer.c:2386
run_timer_base kernel/time/timer.c:2395 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
handle_softirqs+0x1da/0x6d0 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
run_ktimerd+0x6a/0x100 kernel/softirq.c:1183
smpboot_thread_fn+0x565/0xa70 kernel/smpboot.c:160
kthread+0x38b/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210
Code: 79 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 c3 cc cc cc cc cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc90000a3f8f8 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: ffffffff8b58d998 RCX: 8000000000010003
RDX: 0000000000000000 RSI: ffffffff8b58d998 RDI: 0000000000000160
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f63b70 R12: 0000000000000b00
R13: 0000000000000000 R14: 0000000000000b00 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125cd6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f02e2535ff8 CR3: 00000000645d2000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 4 bytes skipped:
0: 0f 1f 40 00 nopl 0x0(%rax)
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 0f 1f 40 d6 nopl -0x2a(%rax)
18: 48 c1 ef 03 shr $0x3,%rdi
1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
23: fc ff df
* 26: 0f b6 04 07 movzbl (%rdi,%rax,1),%eax <-- trapping instruction
2a: 3c 08 cmp $0x8,%al
2c: 0f 92 c0 setb %al
2f: c3 ret
30: cc int3
31: cc int3
32: cc int3
33: cc int3
34: cc int3
35: 66 data16
36: 66 data16
37: 66 data16
38: 66 data16
39: 66 data16
3a: 66 data16
3b: 2e cs
Struck through repros no longer work on HEAD.