[syzbot] [jfs?] kernel BUG in txEnd

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 692b7dc87ca6 Merge tag 'hyperv-fixes-signed-20230619' of g..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=110bb2df280000
kernel config: https://syzkaller.appspot.com/x/.config?x=e74b395fe4978721
dashboard link: https://syzkaller.appspot.com/bug?extid=3699edf4da1e736b317b
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16b373a7280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1749e8f3280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/38d2d82cb73f/disk-692b7dc8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c2933a370148/vmlinux-692b7dc8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ae0615062569/bzImage-692b7dc8.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/7ffba913af27/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3699ed...@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
ERROR: (device loop0): xtTruncate: XT_GETPAGE: xtree page corrupt
ERROR: (device loop0): remounting filesystem as read-only
BUG at fs/jfs/jfs_txnmgr.c:523 assert(tblk->next == 0)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:523!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4995 Comm: syz-executor157 Not tainted 6.4.0-rc7-syzkaller-00014-g692b7dc87ca6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:txEnd+0x556/0x560 fs/jfs/jfs_txnmgr.c:523
Code: fe e9 cd fe ff ff e8 e9 71 80 fe 48 c7 c7 00 81 21 8b 48 c7 c6 39 7d 21 8b ba 0b 02 00 00 48 c7 c1 40 81 21 8b e8 4a a0 a2 07 <0f> 0b 0f 1f 84 00 00 00 00 00 66 0f 1f 00 55 41 57 41 56 41 55 41
RSP: 0018:ffffc90003a1f5b0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: 0000000000000001 RCX: 41752a4d4c338600
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 1ffff920004ce227 R08: ffffffff816f00ac R09: fffff52000743e2d
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 0000000000000001 R14: ffffc90002671138 R15: 0000000000000110
FS: 0000555555bc0300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdb3a73ff8 CR3: 000000007d1a7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
jfs_truncate_nolock+0x2f3/0x390 fs/jfs/inode.c:391
jfs_truncate+0xcb/0x140 fs/jfs/inode.c:412
jfs_setattr+0x526/0x780 fs/jfs/file.c:119
notify_change+0xc8b/0xf40 fs/attr.c:483
do_truncate+0x220/0x300 fs/open.c:66
handle_truncate fs/namei.c:3295 [inline]
do_open fs/namei.c:3640 [inline]
path_openat+0x294e/0x3170 fs/namei.c:3791
do_filp_open+0x234/0x490 fs/namei.c:3818
do_sys_openat2+0x13f/0x500 fs/open.c:1356
do_sys_open fs/open.c:1372 [inline]
__do_sys_open fs/open.c:1380 [inline]
__se_sys_open fs/open.c:1376 [inline]
__x64_sys_open+0x225/0x270 fs/open.c:1376
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7faa7bec2769
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcd6b116f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007faa7bec2769
RDX: 0000000000000000 RSI: 000000000014527e RDI: 0000000020000040
RBP: 00007faa7be82000 R08: 0000000000005dea R09: 0000000000000000
R10: 00007ffcd6b115c0 R11: 0000000000000246 R12: 00007faa7be82090
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txEnd+0x556/0x560 fs/jfs/jfs_txnmgr.c:523
Code: fe e9 cd fe ff ff e8 e9 71 80 fe 48 c7 c7 00 81 21 8b 48 c7 c6 39 7d 21 8b ba 0b 02 00 00 48 c7 c1 40 81 21 8b e8 4a a0 a2 07 <0f> 0b 0f 1f 84 00 00 00 00 00 66 0f 1f 00 55 41 57 41 56 41 55 41
RSP: 0018:ffffc90003a1f5b0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: 0000000000000001 RCX: 41752a4d4c338600
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 1ffff920004ce227 R08: ffffffff816f00ac R09: fffff52000743e2d
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 0000000000000001 R14: ffffc90002671138 R15: 0000000000000110
FS: 0000555555bc0300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdb3a73ff8 CR3: 000000007d1a7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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[syzbot]

syzbot suspects this issue was fixed by commit:

commit 6f861765464f43a71462d52026fbddfc858239a5
Author: Jan Kara <ja...@suse.cz>
Date: Wed Nov 1 17:43:10 2023 +0000

fs: Block writes to mounted block devices

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1280b62be80000
start commit: 692b7dc87ca6 Merge tag 'hyperv-fixes-signed-20230619' of g..
git tree: upstream

kernel config: https://syzkaller.appspot.com/x/.config?x=e74b395fe4978721
dashboard link: https://syzkaller.appspot.com/bug?extid=3699edf4da1e736b317b

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16b373a7280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1749e8f3280000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: fs: Block writes to mounted block devices

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[Jan Kara]

On Fri 12-01-24 17:28:04, syzbot wrote:
> syzbot suspects this issue was fixed by commit:
>
> commit 6f861765464f43a71462d52026fbddfc858239a5
> Author: Jan Kara <ja...@suse.cz>
> Date: Wed Nov 1 17:43:10 2023 +0000
>
> fs: Block writes to mounted block devices
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1280b62be80000
> start commit: 692b7dc87ca6 Merge tag 'hyperv-fixes-signed-20230619' of g..
> git tree: upstream
> kernel config: https://syzkaller.appspot.com/x/.config?x=e74b395fe4978721
> dashboard link: https://syzkaller.appspot.com/bug?extid=3699edf4da1e736b317b
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16b373a7280000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1749e8f3280000
>
> If the result looks correct, please mark the issue as fixed by replying with:

Makes sense:

#syz fix: fs: Block writes to mounted block devices

Honza

--
Jan Kara <ja...@suse.com>
SUSE Labs, CR