Message-ID: <685b3c1b.050a0220.2303ee.0010.GAE@google.com>
Date: Tue, 24 Jun 2025 17:00:27 -0700
From: syzbot <syzbot+dc27c5fb8388e38d2d37@...kaller.appspotmail.com>
To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, 
	daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com, 
	henriette.herzog@....de, john.fastabend@...il.com, jolsa@...nel.org, 
	kpsingh@...nel.org, linux-kernel@...r.kernel.org, luis.gerhorst@....de, 
	martin.lau@...ux.dev, memxor@...il.com, sdf@...ichev.me, song@...nel.org, 
	syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev
Subject: [syzbot] [bpf?] WARNING: kernel/bpf/verifier.c:LINE at do_check, CPU: syz.NUM.NUM/NUM

Hello,

syzbot found the following issue on:

HEAD commit:    050f8ad7b58d Add linux-next specific files for 20250616
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10678370580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d2efc7740224b93a
dashboard link: https://syzkaller.appspot.com/bug?extid=dc27c5fb8388e38d2d37
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13531e82580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/49faa18d2f53/disk-050f8ad7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7c6f9cd7fe5d/vmlinux-050f8ad7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/84a08d6403ee/bzImage-050f8ad7.xz

The issue was bisected to:

commit d6f1c85f22534d2d9fea9b32645da19c91ebe7d2
Author: Luis Gerhorst <luis.gerhorst@....de>
Date:   Tue Jun 3 21:24:28 2025 +0000

    bpf: Fall back to nospec for Spectre v1

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1346f6bc580000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10c6f6bc580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1746f6bc580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dc27c5fb8388e38d2d37@...kaller.appspotmail.com
Fixes: d6f1c85f2253 ("bpf: Fall back to nospec for Spectre v1")

------------[ cut here ]------------
WARNING: kernel/bpf/verifier.c:19944 at do_check+0xa99c/0xdba0 kernel/bpf/verifier.c:19944, CPU#0: syz.0.16/6006
Modules linked in:
CPU: 0 UID: 0 PID: 6006 Comm: syz.0.16 Not tainted 6.16.0-rc2-next-20250616-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:do_check+0xa99c/0xdba0 kernel/bpf/verifier.c:19944
Code: fc ff df 0f b6 04 08 84 c0 0f 85 91 2a 00 00 c7 03 00 00 00 00 49 bd 00 00 00 00 00 fc ff df e9 9d e9 ff ff e8 95 8a e9 ff 90 <0f> 0b 90 e9 fe cf ff ff e8 87 8a e9 ff 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90003d7eec0 EFLAGS: 00010293
RAX: ffffffff81d6df9b RBX: 0000000000000011 RCX: ffff88807a10da00
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000011
RBP: ffffc90003d7f2d0 R08: 0000000000000004 R09: 0000000000000004
R10: ffff88802fa5b07c R11: ffffed1005f4b612 R12: 0000000000000010
R13: dffffc0000000000 R14: ffffc9000321e000 R15: ffffc9000321e611
FS:  0000555578232500(0000) GS:ffff888125c40000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f25ffff CR3: 0000000076224000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_check_common+0x18c9/0x2400 kernel/bpf/verifier.c:23078
 do_check_main kernel/bpf/verifier.c:23161 [inline]
 bpf_check+0x110e2/0x1a240 kernel/bpf/verifier.c:24515
 bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2972
 __sys_bpf+0x5f1/0x860 kernel/bpf/syscall.c:5978
 __do_sys_bpf kernel/bpf/syscall.c:6085 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6083 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6083
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9eb5d8e929
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:00007ffcbbdcac48 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f9eb5fb5fa0 RCX: 00007f9eb5d8e929
RDX: 0000000000000090 RSI: 00002000000004c0 RDI: 0000000000000005
RBP: 00007f9eb5e10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9eb5fb5fa0 R14: 00007f9eb5fb5fa0 R15: 0000000000000003
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

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