linux-kernel - Re: [syzbot] [bpf?] WARNING in bpf

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Message-ID: <aLqv9eV-wDfZj-gI@mail.gmail.com>
Date: Fri, 5 Sep 2025 11:40:05 +0200
From: Paul Chaignon <paul.chaignon@...il.com>
To: syzbot <syzbot+27689b73d9cffb8c6bca@...kaller.appspotmail.com>
Cc: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
	daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com,
	john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org,
	linux-kernel@...r.kernel.org, martin.lau@...ux.dev, sdf@...ichev.me,
	song@...nel.org, syzkaller-bugs@...glegroups.com,
	yonghong.song@...ux.dev
Subject: Re: [syzbot] [bpf?] WARNING in bpf_check (5)

On Thu, Sep 04, 2025 at 05:35:31PM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    8f5ae30d69d7 Linux 6.17-rc1
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=10dc087c580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5ac3d8b8abfcb
> dashboard link: https://syzkaller.appspot.com/bug?extid=27689b73d9cffb8c6bca
> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> userspace arch: arm64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16342134580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10e75a42580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/18a2e4bd0c4a/disk-8f5ae30d.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/3b5395881b25/vmlinux-8f5ae30d.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/e875f4e3b7ff/Image-8f5ae30d.gz.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+27689b73d9cffb8c6bca@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> verifier bug: not inlined functions bpf_perf_event_read#22 is missing func(1)
> WARNING: CPU: 1 PID: 6725 at kernel/bpf/verifier.c:22840 do_misc_fixups kernel/bpf/verifier.c:22838 [inline]
> WARNING: CPU: 1 PID: 6725 at kernel/bpf/verifier.c:22840 bpf_check+0x1559c/0x15d8c kernel/bpf/verifier.c:24742

This one was already reported as
https://syzkaller.appspot.com/bug?extid=a9ed3d9132939852d0df and fixed
in e4414b01c1cd ("bpf: Check the helper function is valid in
get_helper_proto") (in bpf tree).

#syz dup: [syzbot] [bpf?] WARNING in do_misc_fixups

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