linux-kernel - Re: [PATCH bpf-next] bpf: Fix WARN() in get_bpf_raw_tp

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Message-Id: 
 <174715443176.1726492.3970535040989082587.git-patchwork-notify@kernel.org>
Date: Tue, 13 May 2025 16:40:31 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Tao Chen <chen.dylane@...ux.dev>
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
 martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, john.fastabend@...il.com, kpsingh@...nel.org,
 sdf@...ichev.me, haoluo@...gle.com, jolsa@...nel.org, rostedt@...dmis.org,
 mhiramat@...nel.org, mathieu.desnoyers@...icios.com, mmullins@...com,
 bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org,
 syzbot+45b0c89a0fc7ae8dbadc@...kaller.appspotmail.com
Subject: Re: [PATCH bpf-next] bpf: Fix WARN() in get_bpf_raw_tp_regs

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@...nel.org>:

On Tue, 13 May 2025 12:27:47 +0800 you wrote:
> syzkaller reported an issue:
> 
> WARNING: CPU: 3 PID: 5971 at kernel/trace/bpf_trace.c:1861 get_bpf_raw_tp_regs+0xa4/0x100 kernel/trace/bpf_trace.c:1861
> Modules linked in:
> CPU: 3 UID: 0 PID: 5971 Comm: syz-executor205 Not tainted 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> RIP: 0010:get_bpf_raw_tp_regs+0xa4/0x100 kernel/trace/bpf_trace.c:1861
> RSP: 0018:ffffc90003636fa8 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff81c6bc4c
> RDX: ffff888032efc880 RSI: ffffffff81c6bc83 RDI: 0000000000000005
> RBP: ffff88806a730860 R08: 0000000000000005 R09: 0000000000000003
> R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000004
> R13: 0000000000000001 R14: ffffc90003637008 R15: 0000000000000900
> FS:  0000000000000000(0000) GS:ffff8880d6cdf000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f7baee09130 CR3: 0000000029f5a000 CR4: 0000000000352ef0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1934 [inline]
>  bpf_get_stack_raw_tp+0x24/0x160 kernel/trace/bpf_trace.c:1931
>  bpf_prog_ec3b2eefa702d8d3+0x43/0x47
>  bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline]
>  __bpf_prog_run include/linux/filter.h:718 [inline]
>  bpf_prog_run include/linux/filter.h:725 [inline]
>  __bpf_trace_run kernel/trace/bpf_trace.c:2363 [inline]
>  bpf_trace_run3+0x23f/0x5a0 kernel/trace/bpf_trace.c:2405
>  __bpf_trace_mmap_lock_acquire_returned+0xfc/0x140 include/trace/events/mmap_lock.h:47
>  __traceiter_mmap_lock_acquire_returned+0x79/0xc0 include/trace/events/mmap_lock.h:47
>  __do_trace_mmap_lock_acquire_returned include/trace/events/mmap_lock.h:47 [inline]
>  trace_mmap_lock_acquire_returned include/trace/events/mmap_lock.h:47 [inline]
>  __mmap_lock_do_trace_acquire_returned+0x138/0x1f0 mm/mmap_lock.c:35
>  __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
>  mmap_read_trylock include/linux/mmap_lock.h:204 [inline]
>  stack_map_get_build_id_offset+0x535/0x6f0 kernel/bpf/stackmap.c:157
>  __bpf_get_stack+0x307/0xa10 kernel/bpf/stackmap.c:483
>  ____bpf_get_stack kernel/bpf/stackmap.c:499 [inline]
>  bpf_get_stack+0x32/0x40 kernel/bpf/stackmap.c:496
>  ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1941 [inline]
>  bpf_get_stack_raw_tp+0x124/0x160 kernel/trace/bpf_trace.c:1931
>  bpf_prog_ec3b2eefa702d8d3+0x43/0x47
> 
> [...]

Here is the summary with links:
  - [bpf-next] bpf: Fix WARN() in get_bpf_raw_tp_regs
    https://git.kernel.org/bpf/bpf-next/c/3880cdbed1c4

You are awesome, thank you!
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