Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_dio_wr_get_block

syzbot
2025-02-15T23:07:27Z

syzbot has found a reproducer for the following issue on:

HEAD commit: 7ff71e6d9239 Merge tag 'alpha-fixes-v6.14-rc2' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1463cbf8580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c776e555cfbdb82d
dashboard link: https://syzkaller.appspot.com/bug?extid=f8b081be889b639423bb
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=1242b9b0580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-7ff71e6d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fd3ab8248fc7/vmlinux-7ff71e6d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/78a957463e92/bzImage-7ff71e6d.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/9f4996b458f4/mount_0.gz
fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=13d217df980000)
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/bb9bcc7dccee/mount_1.gz
fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=1063cbf8580000)
mounted in repro #3: https://storage.googleapis.com/syzbot-assets/f9c91d3ae4fc/mount_11.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f8b081be889b639423bb@syzkaller.appspotmail.com

(syz.0.529,6754,0):ocfs2_commit_trans:382 ERROR: status = -5
------------[ cut here ]------------
kernel BUG at fs/ocfs2/aops.c:2259!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 6754 Comm: syz.0.529 Not tainted 6.14.0-rc2-syzkaller-00259-g7ff71e6d9239 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ocfs2_dio_wr_get_block+0x18bd/0x18d0 fs/ocfs2/aops.c:2259
Code: 02 8f 4c 89 f2 e8 13 7d 76 01 e9 3a f6 ff ff e8 99 d0 50 08 e8 b4 5b 0a fe 90 0f 0b e8 ac 5b 0a fe 90 0f 0b e8 a4 5b 0a fe 90 <0f> 0b e8 9c 5b 0a fe 90 0f 0b 66 0f 1f 84 00 00 00 00 00 90 90 90
RSP: 0018:ffffc9000d1a6cc0 EFLAGS: 00010293
RAX: ffffffff83b75c9c RBX: 0000000000001000 RCX: ffff8880003b2440
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00000000ffffffe2
RBP: ffffc9000d1a6eb0 R08: ffffffff83b7573b R09: 1ffffffff28a892d
R10: dffffc0000000000 R11: fffffbfff28a892e R12: 1ffff1100b25690d
R13: dffffc0000000000 R14: 00000000ffffffe2 R15: ffff888033f59e10
FS: 00007f9eff0936c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa1c7fd4000 CR3: 00000000595e2000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
get_more_blocks fs/direct-io.c:648 [inline]
do_direct_IO fs/direct-io.c:936 [inline]
__blockdev_direct_IO+0x1c87/0x4890 fs/direct-io.c:1243
ocfs2_direct_IO+0x255/0x2c0 fs/ocfs2/aops.c:2445
generic_file_direct_write+0x1e6/0x400 mm/filemap.c:4112
__generic_file_write_iter+0x126/0x230 mm/filemap.c:4276
ocfs2_file_write_iter+0x19af/0x2180 fs/ocfs2/file.c:2469
iter_file_splice_write+0xbfa/0x1510 fs/splice.c:743
do_splice_from fs/splice.c:941 [inline]
direct_splice_actor+0x11b/0x220 fs/splice.c:1164
splice_direct_to_actor+0x586/0xc80 fs/splice.c:1108
do_splice_direct_actor fs/splice.c:1207 [inline]
do_splice_direct+0x289/0x3e0 fs/splice.c:1233
do_sendfile+0x564/0x8a0 fs/read_write.c:1363
__do_sys_sendfile64 fs/read_write.c:1424 [inline]
__se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1410
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9efe18cde9
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:00007f9eff093038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f9efe3a5fa0 RCX: 00007f9efe18cde9
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000009
RBP: 00007f9efe20e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000800000009 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9efe3a5fa0 R15: 00007ffc84ed0c78
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_dio_wr_get_block+0x18bd/0x18d0 fs/ocfs2/aops.c:2259
Code: 02 8f 4c 89 f2 e8 13 7d 76 01 e9 3a f6 ff ff e8 99 d0 50 08 e8 b4 5b 0a fe 90 0f 0b e8 ac 5b 0a fe 90 0f 0b e8 a4 5b 0a fe 90 <0f> 0b e8 9c 5b 0a fe 90 0f 0b 66 0f 1f 84 00 00 00 00 00 90 90 90
RSP: 0018:ffffc9000d1a6cc0 EFLAGS: 00010293
RAX: ffffffff83b75c9c RBX: 0000000000001000 RCX: ffff8880003b2440
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00000000ffffffe2
RBP: ffffc9000d1a6eb0 R08: ffffffff83b7573b R09: 1ffffffff28a892d
R10: dffffc0000000000 R11: fffffbfff28a892e R12: 1ffff1100b25690d
R13: dffffc0000000000 R14: 00000000ffffffe2 R15: ffff888033f59e10
FS: 00007f9eff0936c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1bd36e8000 CR3: 00000000595e2000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

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#syz test: git://repo/address.git branch-or-commit-hash
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