syzbot
general protection fault in ring_buffer_event_time_stamp
Status:
premoderation: reported on 2026/09/08 19:26
Reported-by: syzbot+82350a87332a1ac647d9@syzkaller.appspotmail.com
First crash: 14d, last: 14d
Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 993 Comm: syz.1.146 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:ring_buffer_event_time_stamp+0x24/0x80 kernel/trace/ring_buffer.c:304
Code: 52 49 39 00 eb 8a 55 48 89 e5 41 56 53 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 87 c8 fe ff 48 8d 7b 04 48 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 75 24 8b 43 04 48 c1 e0 1b 48 89 d9 48 c1 e9
RSP: 0018:ffffc90000f1ef90 EFLAGS: 00010047
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000254f000 RSI: 000000000007ffff RDI: 0000000000000004
RBP: ffffc90000f1efa0 R08: ffffc90000f1f207 R09: ffffc90000f1f200
R10: dffffc0000000000 R11: fffff520001e3e41 R12: dffffc0000000000
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff888117258000
FS: 00007ff72f0536c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e50bff8 CR3: 000000012c11d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
hist_field_timestamp+0x82/0x110 kernel/trace/trace_events_hist.c:766
event_hist_trigger+0x377/0x1630 kernel/trace/trace_events_hist.c:4921
event_triggers_call+0x1c1/0x2a0 kernel/trace/trace_events_trigger.c:-1
trace_trigger_soft_disabled include/linux/trace_events.h:613 [inline]
trace_event_raw_event_sched_switch+0xe5/0x470 include/trace/events/sched.h:222
__traceiter_sched_switch+0x85/0xc0 include/trace/events/sched.h:222
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x1198/0x13e0 kernel/sched/core.c:4803
preempt_schedule_irq+0xaa/0x120 kernel/sched/core.c:5067
irqentry_exit_cond_resched kernel/entry/common.c:365 [inline]
irqentry_exit+0x56/0x60 kernel/entry/common.c:395
sysvec_reschedule_ipi+0x69/0x70 arch/x86/kernel/smp.c:225
asm_sysvec_reschedule_ipi+0x12/0x20 arch/x86/include/asm/idtentry.h:640
RIP: 0010:event_command_post_trigger kernel/trace/trace.h:1979 [inline]
RIP: 0010:update_cond_flag+0x91/0x100 kernel/trace/trace_events_trigger.c:514
Code: d8 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 62 41 33 00 4d 8b 3f 49 83 c7 1c 4c 89 f8 48 c1 e8 03 42 0f b6 04 20 <84> c0 75 0d 41 f6 07 03 75 3f e8 70 c0 f8 ff eb 84 44 89 f9 80 e1
RSP: 0018:ffffc90000f1f850 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: ffff88810011d2d0 RCX: 0000000000080000
RDX: ffffc9000254f000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90000f1f878 R08: ffff888124d41c0f R09: 1ffff110249a8381
R10: dffffc0000000000 R11: ffffed10249a8382 R12: dffffc0000000000
R13: ffff88810011d308 R14: ffff88810b6d3340 R15: ffffffff865d961c
hist_trigger_enable+0x108/0x230 kernel/trace/trace_events_hist.c:5886
event_hist_trigger_func+0x3fb9/0x4c60 kernel/trace/trace_events_hist.c:6185
trigger_process_regex+0x1ce/0x260 kernel/trace/trace_events_trigger.c:235
event_trigger_regex_write kernel/trace/trace_events_trigger.c:272 [inline]
event_trigger_write+0xf5/0x180 kernel/trace/trace_events_trigger.c:301
vfs_write+0x344/0xd70 fs/read_write.c:603
ksys_write+0x14a/0x260 fs/read_write.c:658
__do_sys_write fs/read_write.c:670 [inline]
__se_sys_write fs/read_write.c:667 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:667
do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7ff73063c159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff72f053028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff7308c4180 RCX: 00007ff73063c159
RDX: 0000000000000020 RSI: 0000200000000180 RDI: 0000000000000003
RBP: 00007ff7306d303b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff7308c4218 R14: 00007ff7308c4180 R15: 00007ffd3bc577a8
Modules linked in:
---[ end trace d6474812f95ac504 ]---
RIP: 0010:ring_buffer_event_time_stamp+0x24/0x80 kernel/trace/ring_buffer.c:304
Code: 52 49 39 00 eb 8a 55 48 89 e5 41 56 53 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 87 c8 fe ff 48 8d 7b 04 48 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 75 24 8b 43 04 48 c1 e0 1b 48 89 d9 48 c1 e9
RSP: 0018:ffffc90000f1ef90 EFLAGS: 00010047
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000254f000 RSI: 000000000007ffff RDI: 0000000000000004
RBP: ffffc90000f1efa0 R08: ffffc90000f1f207 R09: ffffc90000f1f200
R10: dffffc0000000000 R11: fffff520001e3e41 R12: dffffc0000000000
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff888117258000
FS: 00007ff72f0536c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e50bff8 CR3: 000000012c11d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 52 push %rdx
1: 49 39 00 cmp %rax,(%r8)
4: eb 8a jmp 0xffffff90
6: 55 push %rbp
7: 48 89 e5 mov %rsp,%rbp
a: 41 56 push %r14
c: 53 push %rbx
d: 48 89 fb mov %rdi,%rbx
10: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14
17: fc ff df
1a: e8 87 c8 fe ff call 0xfffec8a6
1f: 48 8d 7b 04 lea 0x4(%rbx),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 75 24 jne 0x57
33: 8b 43 04 mov 0x4(%rbx),%eax
36: 48 c1 e0 1b shl $0x1b,%rax
3a: 48 89 d9 mov %rbx,%rcx
3d: 48 rex.W
3e: c1 .byte 0xc1
3f: e9 .byte 0xe9
Struck through repros no longer work on HEAD.