syzbot
WARNING in ring_buffer_peek
Status:
upstream: reported on 2026/07/31 15:20
Reported-by: syzbot+fcaa1d3c63ce2e755ff8@syzkaller.appspotmail.com
First crash: 17d, last: 1d03h
Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 9427 at kernel/trace/ring_buffer.c:4528 arch_atomic_inc include/linux/instrumented.h:101 [inline]
WARNING: CPU: 1 PID: 9427 at kernel/trace/ring_buffer.c:4528 atomic_inc include/linux/atomic/atomic-instrumented.h:182 [inline]
WARNING: CPU: 1 PID: 9427 at kernel/trace/ring_buffer.c:4528 rb_get_reader_page+0xac0/0xcd0 kernel/trace/ring_buffer.c:4527
Modules linked in:
CPU: 1 PID: 9427 Comm: syz.6.1078 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:rb_get_reader_page+0xac0/0xcd0 kernel/trace/ring_buffer.c:4527
Code: 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 e7 e8 87 4b 42 00 4d 8b 3c 24 49 8d 7f 08 be 04 00 00 00 e8 15 4d 42 00 f0 41 ff 47 08 <0f> 0b 49 bf 00 00 00 00 00 fc ff df 4c 8b 6c 24 30 48 83 7c 24 18
RSP: 0018:ffffc90002eff780 EFLAGS: 00010002
RAX: 1ffff11002db9f01 RBX: 1ffff11027fcb9d6 RCX: ffffffff817bd3fb
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888016c70408
RBP: ffffc90002eff920 R08: ffff888016c7040b R09: 1ffff11002d8e081
R10: dffffc0000000000 R11: ffffed1002d8e082 R12: ffff888016dcf810
R13: 0000000000000ff0 R14: 1ffff11027fcb9d3 R15: ffff888016c70400
FS: 00007f67ff24d6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c392d2f CR3: 0000000072aa1000 CR4: 00000000003506e0
DR0: 0000000000000009 DR1: 0000000000000009 DR2: 0000000000000003
DR3: 0000000000000008 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
rb_buffer_peek+0x5c/0x780 kernel/trace/ring_buffer.c:4741
ring_buffer_peek+0x1de/0x400 kernel/trace/ring_buffer.c:4941
peek_next_entry kernel/trace/trace.c:3572 [inline]
__find_next_entry+0x350/0x6b0 kernel/trace/trace.c:3616
trace_find_next_entry_inc kernel/trace/trace.c:3997 [inline]
tracing_read_pipe+0x3b1/0xae0 kernel/trace/trace.c:6858
do_loop_readv_writev fs/read_write.c:-1 [inline]
do_iter_read+0x505/0x7c0 fs/read_write.c:792
vfs_readv fs/read_write.c:910 [inline]
do_readv+0x266/0x460 fs/read_write.c:947
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f6800ff50d9
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:00007f67ff24d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00007f680127cfa0 RCX: 00007f6800ff50d9
RDX: 0000000000000002 RSI: 0000200000000240 RDI: 0000000000000006
RBP: 00007f680108c024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f680127d038 R14: 00007f680127cfa0 R15: 00007ffd4c460fd8
</TASK>
* Struck through repros no longer work on HEAD.