WARNING in bpf_bprintf

Title	Replies (including bot)	Last reply
[syzbot] [bpf?] WARNING in bpf_bprintf_prepare (3)	3 (8)	2025/10/22 19:56

Title

Replies (including bot)

Last reply

[syzbot] [bpf?] WARNING in bpf_bprintf_prepare (3)

3 (8)

2025/10/22 19:56

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	WARNING in bpf_bprintf_prepare (2) bpf	-1	C			2	1106d	1145d	22/29	fixed on 2023/02/24 13:50
upstream	WARNING in bpf_bprintf_prepare bpf	-1	C	unreliable		96	1589d	1627d	20/29	fixed on 2021/11/10 00:50

Rank 🛈

upstream

WARNING in bpf_bprintf_prepare (2) bpf

-1

1106d

1145d

22/29

fixed on 2023/02/24 13:50

upstream

WARNING in bpf_bprintf_prepare bpf

-1

unreliable

1589d

1627d

20/29

fixed on 2021/11/10 00:50


Created	Duration	User	Patch	Repo	Result
2025/10/21 16:26	1h27m	chandna.sahil@gmail.com	patch	bpf	OK log
2025/10/21 09:56	2h39m	listout@listout.xyz	patch	bpf	report log
2025/10/21 09:53	1h38m	listout@listout.xyz	patch	bpf	report log
2025/10/21 06:49	13m	chandna.sahil@gmail.com	patch	bpf	error

------------[ cut here ]------------ WARNING: CPU: 1 PID: 6145 at kernel/bpf/helpers.c:781 bpf_try_get_buffers kernel/bpf/helpers.c:781 [inline] WARNING: CPU: 1 PID: 6145 at kernel/bpf/helpers.c:781 bpf_bprintf_prepare+0x12cf/0x13a0 kernel/bpf/helpers.c:834 Modules linked in: CPU: 1 UID: 0 PID: 6145 Comm: syz.4.53 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:bpf_try_get_buffers kernel/bpf/helpers.c:781 [inline] RIP: 0010:bpf_bprintf_prepare+0x12cf/0x13a0 kernel/bpf/helpers.c:834 Code: ff e9 ce fe ff ff e8 10 ec e0 ff e9 be fe ff ff e8 06 ec e0 ff e9 b4 fe ff ff e8 fc eb e0 ff e9 aa fe ff ff e8 f2 eb e0 ff 90 <0f> 0b 90 65 ff 0d 27 fd b2 10 b8 f0 ff ff ff e9 17 ff ff ff e8 d8 RSP: 0018:ffffc90003797840 EFLAGS: 00010293 RAX: ffffffff81df57fe RBX: ffffc90003797a10 RCX: ffff888026493c80 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003 RBP: ffffc90003797970 R08: 0000000000585870 R09: 0000000000000005 R10: dffffc0000000000 R11: fffff520006f2f20 R12: dffffc0000000000 R13: 0000000000000004 R14: 0000000000000003 R15: 1ffff920006f2f42 FS: 00005555805f5500(0000) GS:ffff888125e0c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007c04e000 CR4: 00000000003526f0 Call Trace: <TASK> ____bpf_trace_printk kernel/trace/bpf_trace.c:372 [inline] bpf_trace_printk+0xdb/0x190 kernel/trace/bpf_trace.c:362 bpf_prog_bfbd7bf4bf171090+0x41/0x5a bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline] __bpf_prog_run include/linux/filter.h:721 [inline] bpf_prog_run include/linux/filter.h:728 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:745 [inline] bpf_flow_dissect+0x225/0x720 net/core/flow_dissector.c:1024 bpf_prog_test_run_flow_dissector+0x37c/0x5c0 net/bpf/test_run.c:1414 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4688 __sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6167 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline] __se_sys_bpf kernel/bpf/syscall.c:6257 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6257 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f25b0f8efc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe036cd5e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f25b11e5fa0 RCX: 00007f25b0f8efc9 RDX: 0000000000000050 RSI: 0000200000000180 RDI: 000000000000000a RBP: 00007f25b1011f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f25b11e5fa0 R14: 00007f25b11e5fa0 R15: 0000000000000003 </TASK>

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/10/18 08:04	bpf	a1e83d4c0361	1c8c8cd8	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci-upstream-bpf-kasan-gce	WARNING in bpf_bprintf_prepare

Crashes (1):

Assets (help?)