linux-kernel - Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in diNewExt

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Message-ID: <0000000000008f62a9060c3b5f6d@google.com>
Date:   Mon, 11 Dec 2023 04:50:06 -0800
From:   syzbot <syzbot+553d90297e6d2f50dbc7@...kaller.appspotmail.com>
To:     eadavis@...com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in diNewExt

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in lbmIODone

BUG at fs/jfs/jfs_logmgr.c:2303 assert(bp->l_flag & lbmRELEASE)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_logmgr.c:2303!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 22 Comm: ksoftirqd/1 Not tainted 6.7.0-rc4-syzkaller-00009-gbee0e7762ad2-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:lbmIODone+0x16fa/0x1750 fs/jfs/jfs_logmgr.c:2303
Code: fe 07 90 0f 0b e8 e6 cf 78 fe 48 c7 c7 c0 73 a2 8b 48 c7 c6 c0 6e a2 8b ba ff 08 00 00 48 c7 c1 20 7d a2 8b e8 67 a8 fe 07 90 <0f> 0b e8 bf cf 78 fe 48 c7 c7 c0 73 a2 8b 48 c7 c6 c0 6e a2 8b ba
RSP: 0018:ffffc900001c7ad8 EFLAGS: 00010046
RAX: 000000000000003f RBX: 0000000000000020 RCX: f6d0cfb74fb3eb00
RDX: 0000000080000101 RSI: 0000000080000101 RDI: 0000000000000000
RBP: ffff8880278cb008 R08: ffffffff8171379c R09: 1ffff92000038efc
R10: dffffc0000000000 R11: fffff52000038efd R12: dffffc0000000000
R13: ffff8880278cb000 R14: ffff88807eb3da78 R15: 0000000000000246
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0013fe000 CR3: 00000000702ba000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 req_bio_endio block/blk-mq.c:788 [inline]
 blk_update_request+0x53f/0x1020 block/blk-mq.c:933
 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1056
 blk_complete_reqs block/blk-mq.c:1131 [inline]
 blk_done_softirq+0x103/0x150 block/blk-mq.c:1136
 __do_softirq+0x2b8/0x939 kernel/softirq.c:553
 run_ksoftirqd+0xc5/0x120 kernel/softirq.c:921
 smpboot_thread_fn+0x530/0x9f0 kernel/smpboot.c:164
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:lbmIODone+0x16fa/0x1750 fs/jfs/jfs_logmgr.c:2303
Code: fe 07 90 0f 0b e8 e6 cf 78 fe 48 c7 c7 c0 73 a2 8b 48 c7 c6 c0 6e a2 8b ba ff 08 00 00 48 c7 c1 20 7d a2 8b e8 67 a8 fe 07 90 <0f> 0b e8 bf cf 78 fe 48 c7 c7 c0 73 a2 8b 48 c7 c6 c0 6e a2 8b ba
RSP: 0018:ffffc900001c7ad8 EFLAGS: 00010046
RAX: 000000000000003f RBX: 0000000000000020 RCX: f6d0cfb74fb3eb00
RDX: 0000000080000101 RSI: 0000000080000101 RDI: 0000000000000000
RBP: ffff8880278cb008 R08: ffffffff8171379c R09: 1ffff92000038efc
R10: dffffc0000000000 R11: fffff52000038efd R12: dffffc0000000000
R13: ffff8880278cb000 R14: ffff88807eb3da78 R15: 0000000000000246
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0013fe000 CR3: 00000000702ba000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit:         bee0e776 Merge tag 'for-linus-iommufd' of git://git.ke..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=13272966e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b45dfd882e46ec91
dashboard link: https://syzkaller.appspot.com/bug?extid=553d90297e6d2f50dbc7
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=165f472ee80000