WARNING in ring_buffer_peek

Status: upstream: reported on 2026/07/31 15:20
Reported-by: syzbot+fcaa1d3c63ce2e755ff8@syzkaller.appspotmail.com
First crash: 26d, last: 2d08h
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in ring_buffer_peek -1 syz, C 18 58m 30d 0/3 upstream: reported C repro on 2026/07/27 19:36

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 17938 at kernel/trace/ring_buffer.c:4528 arch_atomic_inc include/linux/instrumented.h:101 [inline]
WARNING: CPU: 1 PID: 17938 at kernel/trace/ring_buffer.c:4528 atomic_inc include/linux/atomic/atomic-instrumented.h:182 [inline]
WARNING: CPU: 1 PID: 17938 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: 17938 Comm: syz.5.4421 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 a7 4e 42 00 4d 8b 3c 24 49 8d 7f 08 be 04 00 00 00 e8 35 50 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:ffffc9000354f7c0 EFLAGS: 00010002
RAX: 1ffff11002db9f01 RBX: 1ffff11027fcf7d6 RCX: ffffffff817bd9eb
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888016c70408
RBP: ffffc9000354f960 R08: ffff888016c7040b R09: 1ffff11002d8e081
R10: dffffc0000000000 R11: ffffed1002d8e082 R12: ffff888016dcf810
R13: 0000000000000094 R14: 1ffff11027fcf7d3 R15: ffff888016c70400
FS:  00007f035f3a86c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2b6d0d CR3: 000000005f76f000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 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
 vfs_read+0x2ff/0xd50 fs/read_write.c:483
 ksys_read+0x153/0x260 fs/read_write.c:623
 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: 0033:0x7f03611500d9
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:00007f035f3a8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f03613d7fa0 RCX: 00007f03611500d9
RDX: 0000000000004000 RSI: 0000200000006440 RDI: 0000000000000004
RBP: 00007f03611e7024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f03613d8038 R14: 00007f03613d7fa0 R15: 00007fff63d27b58
 </TASK>

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/25 04:38 linux-5.15.y 945fa863f02c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in ring_buffer_peek
2026/08/23 15:20 linux-5.15.y 945fa863f02c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in ring_buffer_peek
2026/08/16 16:31 linux-5.15.y aabd761612db 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in ring_buffer_peek
2026/08/16 12:12 linux-5.15.y aabd761612db 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in ring_buffer_peek
2026/08/13 20:52 linux-5.15.y aabd761612db b13552fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in ring_buffer_peek
2026/08/08 05:38 linux-5.15.y aabd761612db 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in ring_buffer_peek
2026/08/05 23:45 linux-5.15.y 6e2fd6534337 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in ring_buffer_peek
2026/08/03 23:52 linux-5.15.y 6e2fd6534337 9451e17e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in ring_buffer_peek
2026/08/03 23:51 linux-5.15.y 6e2fd6534337 9451e17e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in ring_buffer_peek
2026/07/31 15:19 linux-5.15.y 6e2fd6534337 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in ring_buffer_peek
* Struck through repros no longer work on HEAD.