WARNING in bpf

Status: upstream: reported C repro on 2020/11/06 13:18
Reported-by: syzbot+b03027a91aadcb9a9b13@syzkaller.appspotmail.com
First crash: 2115d, last: 1281d
▶ ▼ Fix bisection attempts (25)
Created Duration User Patch Repo Result
2023/02/19 03:02 31m bisect fix linux-4.14.y OK (0) job log log
2023/01/19 18:46 24m bisect fix linux-4.14.y OK (0) job log log
2022/10/26 16:58 40m bisect fix linux-4.14.y OK (0) job log log
2022/09/17 07:00 21m bisect fix linux-4.14.y OK (0) job log log
2022/08/18 05:30 25m bisect fix linux-4.14.y OK (0) job log log
2022/07/19 04:58 24m bisect fix linux-4.14.y OK (0) job log log
2022/06/19 04:23 21m bisect fix linux-4.14.y OK (0) job log log
2022/05/20 04:01 22m bisect fix linux-4.14.y OK (0) job log log
2022/04/20 03:41 20m bisect fix linux-4.14.y OK (0) job log log
2022/03/20 19:30 23m bisect fix linux-4.14.y OK (0) job log log
2022/02/18 13:25 28m bisect fix linux-4.14.y OK (0) job log log
2022/01/19 08:43 28m bisect fix linux-4.14.y OK (0) job log log
2021/12/20 08:15 27m bisect fix linux-4.14.y OK (0) job log log
2021/11/20 04:16 21m bisect fix linux-4.14.y OK (0) job log log
2021/10/21 03:22 24m bisect fix linux-4.14.y OK (0) job log log
2021/09/21 03:00 22m bisect fix linux-4.14.y OK (0) job log log
2021/08/22 02:29 28m bisect fix linux-4.14.y OK (0) job log log
2021/07/23 02:08 21m bisect fix linux-4.14.y OK (0) job log log
2021/06/22 19:53 21m bisect fix linux-4.14.y OK (0) job log log
2021/05/23 13:44 27m bisect fix linux-4.14.y OK (0) job log log
2021/04/23 12:35 21m bisect fix linux-4.14.y OK (0) job log log
2021/03/24 11:17 25m bisect fix linux-4.14.y OK (0) job log log
2021/02/22 07:24 21m bisect fix linux-4.14.y OK (0) job log log
2021/02/18 16:01 19m bisect fix linux-4.14.y error job log
2021/02/12 12:06 0m bisect fix linux-4.14.y error job log

Sample crash report:
IPVS: ftp: loaded support on port[0] = 21
perf buffer not large enough
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8026 at kernel/trace/trace_event_perf.c:273 perf_trace_buf_alloc.cold+0x18/0x26 kernel/trace/trace_event_perf.c:273
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8026 Comm: syz-executor801 Not tainted 4.14.206-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x4b kernel/panic.c:547
 report_bug+0x208/0x249 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:perf_trace_buf_alloc.cold+0x18/0x26 kernel/trace/trace_event_perf.c:273
RSP: 0018:ffff8880a2a5fc80 EFLAGS: 00010286
RAX: 000000000000001c RBX: ffff88809be11280 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffed101454bf86
RBP: 0000000000209e54 R08: 000000000000001c R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a2a5fd30
R13: ffff8880a2a5fd40 R14: ffff8880a2a5fd60 R15: 0000000000000000
 perf_trace_bpf_map_keyval+0x1b7/0x820 include/trace/events/bpf.h:228
 trace_bpf_map_update_elem include/trace/events/bpf.h:274 [inline]
 map_update_elem kernel/bpf/syscall.c:612 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1503 [inline]
 SyS_bpf+0x2350/0x35e0 kernel/bpf/syscall.c:1477
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x441579
RSP: 002b:00007fff593a1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441579
RDX: 0000000000000020 RSI: 0000000020000040 RDI: 0000000000000002
RBP: 00007fff593a1c80 R08: 0000000100000000 R09: 0000000100000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000726a
R13: 0000000000402450 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/11/14 10:08 linux-4.14.y 27ce4f2a6817 1bf9a662 .config console log report syz C ci2-linux-4-14
2020/11/06 13:35 linux-4.14.y 6b6446efedb2 cba33199 .config console log report syz C ci2-linux-4-14
2020/11/06 13:17 linux-4.14.y 6b6446efedb2 cba33199 .config console log report info ci2-linux-4-14
* Struck through repros no longer work on HEAD.