linux-kernel - [syzbot] [bpf?] WARNING in convert_ctx

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Message-ID: <68c52a04.050a0220.2ff435.0372.GAE@google.com>
Date: Sat, 13 Sep 2025 01:23:32 -0700
From: syzbot <syzbot+136ca59d411f92e821b7@...kaller.appspotmail.com>
To: 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: [syzbot] [bpf?] WARNING in convert_ctx_accesses (2)

Hello,

syzbot found the following issue on:

HEAD commit:    22f20375f5b7 Merge tag 'pci-v6.17-fixes-3' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1003d642580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=13bd892ec3b155a2
dashboard link: https://syzkaller.appspot.com/bug?extid=136ca59d411f92e821b7
compiler:       aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1782f362580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16c09b12580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/fa3fbcfdac58/non_bootable_disk-22f20375.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2e4b3490c173/vmlinux-22f20375.xz
kernel image: https://storage.googleapis.com/syzbot-assets/884bdc12ee68/Image-22f20375.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+136ca59d411f92e821b7@...kaller.appspotmail.com

------------[ cut here ]------------
verifier bug: error during ctx access conversion (0)(1)
WARNING: CPU: 0 PID: 3603 at kernel/bpf/verifier.c:21452 convert_ctx_accesses+0x9b0/0xb04 kernel/bpf/verifier.c:21452
Modules linked in:
CPU: 0 UID: 0 PID: 3603 Comm: syz.2.17 Not tainted syzkaller #0 PREEMPT 
Hardware name: linux,dummy-virt (DT)
pstate: 61402009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : convert_ctx_accesses+0x9b0/0xb04 kernel/bpf/verifier.c:21452
lr : convert_ctx_accesses+0x9b0/0xb04 kernel/bpf/verifier.c:21452
sp : ffff8000894e39e0
x29: ffff8000894e39e0 x28: fcf0000012540000 x27: 0000000000000002
x26: f4ff800083265058 x25: 0000000000000000 x24: 0000000000000000
x23: ffff8000816c4744 x22: 0000000000000004 x21: 0000000000000002
x20: 0000000000000004 x19: ffff80008242a948 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000002
x14: f6f00000086b0080 x13: 0000000000000400 x12: 000000007e4ab000
x11: 00000023a2977bad x10: f6f00000086b0080 x9 : fbf0000007523c00
x8 : 0000000000000001 x7 : f6f00000086b0080 x6 : 0000000000000002
x5 : 0000000000000297 x4 : 0000000000000297 x3 : f5f0000005c20400
x2 : 0000000000000000 x1 : 0000000000000000 x0 : f6f00000086b0000
Call trace:
 convert_ctx_accesses+0x9b0/0xb04 kernel/bpf/verifier.c:21452 (P)
 bpf_check+0x12f8/0x2aac kernel/bpf/verifier.c:24743
 bpf_prog_load+0x634/0xb74 kernel/bpf/syscall.c:2979
 __sys_bpf+0x2e0/0x1a3c kernel/bpf/syscall.c:6029
 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6137 [inline]
 __arm64_sys_bpf+0x24/0x34 kernel/bpf/syscall.c:6137
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49
 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151
 el0_svc+0x34/0x10c arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:596
---[ end trace 0000000000000000 ]---


---
This report is generated by a bot. It may contain errors.
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