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

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Message-ID: <00000000000081146c06150bcc2a@google.com>
Date: Mon, 01 Apr 2024 09:51:20 -0700
From: syzbot <syzbot+148110ee7cf72f39f33e@...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@...gle.com, 
	song@...nel.org, syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev
Subject: [syzbot] [bpf?] WARNING in __mark_chain_precision (4)

Hello,

syzbot found the following issue on:

HEAD commit:    fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=14024776180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4d90a36f0cab495a
dashboard link: https://syzkaller.appspot.com/bug?extid=148110ee7cf72f39f33e
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10c51c1d180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=127285b1180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f6c04726a2ae/disk-fe46a7dd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/09c26ce901ea/vmlinux-fe46a7dd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/134acf7f5322/bzImage-fe46a7dd.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+148110ee7cf72f39f33e@...kaller.appspotmail.com

------------[ cut here ]------------
verifier backtracking bug
WARNING: CPU: 0 PID: 5066 at kernel/bpf/verifier.c:3714 backtrack_insn kernel/bpf/verifier.c:3714 [inline]
WARNING: CPU: 0 PID: 5066 at kernel/bpf/verifier.c:3714 __mark_chain_precision+0x7027/0x7520 kernel/bpf/verifier.c:4255
Modules linked in:
CPU: 0 PID: 5066 Comm: syz-executor296 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:backtrack_insn kernel/bpf/verifier.c:3714 [inline]
RIP: 0010:__mark_chain_precision+0x7027/0x7520 kernel/bpf/verifier.c:4255
Code: 8b e8 ed df b0 ff 90 0f 0b 90 90 e9 7d f2 ff ff e8 9e 0b ee ff c6 05 41 c2 c9 0d 01 90 48 c7 c7 c0 af b0 8b e8 ca df b0 ff 90 <0f> 0b 90 90 e9 5a f2 ff ff e8 7b 0b ee ff c6 05 1f c2 c9 0d 01 90
RSP: 0018:ffffc900043f6ac0 EFLAGS: 00010246
RAX: 3bf0d782b73e5400 RBX: ffff8880236c5600 RCX: ffff88802a9dbc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900043f6d10 R08: ffffffff8157cb22 R09: 1ffff110172851a2
R10: dffffc0000000000 R11: ffffed10172851a3 R12: 0000000080000000
R13: 0000000000000010 R14: 0000000000000001 R15: ffff8880236c0000
FS:  000055557d2fe380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000082 CR3: 00000000231d4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mark_chain_precision kernel/bpf/verifier.c:4358 [inline]
 check_return_code+0xbe0/0x11e0 kernel/bpf/verifier.c:15500
 do_check+0xb91f/0x10500 kernel/bpf/verifier.c:17867
 do_check_common+0x14bd/0x1dd0 kernel/bpf/verifier.c:20492
 do_check_main kernel/bpf/verifier.c:20583 [inline]
 bpf_check+0x136ab/0x19010 kernel/bpf/verifier.c:21253
 bpf_prog_load+0x1667/0x20f0 kernel/bpf/syscall.c:2895
 __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5631
 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5736 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5736
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f6484f2a469
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc85bd0a08 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007ffc85bd0be8 RCX: 00007f6484f2a469
RDX: 0000000000000090 RSI: 0000000020000600 RDI: 0000000000000005
RBP: 00007f6484f9d610 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc85bd0bd8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>


---
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