[syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_append

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 11066801dd4b Merge tag 'linux_kselftest-fixes-6.12-rc6' of..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=161ed630580000
kernel config: https://syzkaller.appspot.com/x/.config?x=672325e7ab17fdf7
dashboard link: https://syzkaller.appspot.com/bug?extid=a66542ca5ebb4233b563
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=10c0f55f980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12482b40580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-11066801.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b062b193560b/vmlinux-11066801.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5b6da4ee7c42/bzImage-11066801.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/3a77709f2405/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a66542...@syzkaller.appspotmail.com

(syz-executor404,5313,0):ocfs2_truncate_log_append:5874 ERROR: bug expression: tl_count > ocfs2_truncate_recs_per_inode(osb->sb) || tl_count == 0
(syz-executor404,5313,0):ocfs2_truncate_log_append:5874 ERROR: Truncate record count on #77 invalid wanted 39, actual 2087
------------[ cut here ]------------
kernel BUG at fs/ocfs2/alloc.c:5874!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5313 Comm: syz-executor404 Not tainted 6.12.0-rc5-syzkaller-00299-g11066801dd4b #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_truncate_log_append+0x9a8/0x9c0 fs/ocfs2/alloc.c:5868
Code: bc 24 a0 00 00 00 48 c7 c6 ac ae 12 8e ba f2 16 00 00 48 c7 c1 c0 18 49 8c 4d 89 f0 41 89 d9 50 e8 ad 90 20 00 48 83 c4 08 90 <0f> 0b e8 71 87 11 fe 90 0f 0b e8 69 87 11 fe 90 0f 0b e8 f1 d3 43
RSP: 0018:ffffc9000cf16f40 EFLAGS: 00010292
RAX: b4b54f1d10640800 RBX: 0000000000000027 RCX: b4b54f1d10640800
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000cf17070 R08: ffffffff8174a14c R09: 1ffff11003f8519a
R10: dffffc0000000000 R11: ffffed1003f8519b R12: 1ffff110085f5f58
R13: ffffff3800000000 R14: 000000000000004d R15: ffff8880438f0008
FS: 00005555722df380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 000000004010e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
ocfs2_remove_btree_range+0x1303/0x1860 fs/ocfs2/alloc.c:5789
ocfs2_remove_inode_range+0xff3/0x29f0 fs/ocfs2/file.c:1907
ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4537 [inline]
ocfs2_reflink_remap_blocks+0xcd4/0x1f30 fs/ocfs2/refcounttree.c:4684
ocfs2_remap_file_range+0x5fa/0x8d0 fs/ocfs2/file.c:2736
vfs_copy_file_range+0xc07/0x1510 fs/read_write.c:1615
__do_sys_copy_file_range fs/read_write.c:1705 [inline]
__se_sys_copy_file_range+0x3f2/0x5d0 fs/read_write.c:1668
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: 0033:0x7fd327167af9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe6b8e22e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000146
RAX: ffffffffffffffda RBX: 00007fd3271b005e RCX: 00007fd327167af9
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fd3271de610 R08: 000000000000d8c2 R09: 0000000000000000
R10: 0000000020000640 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe6b8e24b8 R14: 0000000000000001 R15: 0000000000000001
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_truncate_log_append+0x9a8/0x9c0 fs/ocfs2/alloc.c:5868
Code: bc 24 a0 00 00 00 48 c7 c6 ac ae 12 8e ba f2 16 00 00 48 c7 c1 c0 18 49 8c 4d 89 f0 41 89 d9 50 e8 ad 90 20 00 48 83 c4 08 90 <0f> 0b e8 71 87 11 fe 90 0f 0b e8 69 87 11 fe 90 0f 0b e8 f1 d3 43
RSP: 0018:ffffc9000cf16f40 EFLAGS: 00010292
RAX: b4b54f1d10640800 RBX: 0000000000000027 RCX: b4b54f1d10640800
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000cf17070 R08: ffffffff8174a14c R09: 1ffff11003f8519a
R10: dffffc0000000000 R11: ffffed1003f8519b R12: 1ffff110085f5f58
R13: ffffff3800000000 R14: 000000000000004d R15: ffff8880438f0008
FS: 00005555722df380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 000000004010e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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#syz undup

[Glass Su]

> On Nov 7, 2024, at 01:37, syzbot <syzbot+a66542...@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 11066801dd4b Merge tag 'linux_kselftest-fixes-6.12-rc6' of..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=161ed630580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=672325e7ab17fdf7
> dashboard link: https://syzkaller.appspot.com/bug?extid=a66542ca5ebb4233b563
> 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=10c0f55f980000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12482b40580000

I can still repro the BUG_ON in my test box.

#syz test

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 395e23920632..cef3d5562e21 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -6154,6 +6154,9 @@ static int ocfs2_get_truncate_log_info(struct ocfs2_super *osb,
int status;
struct inode *inode = NULL;
struct buffer_head *bh = NULL;
+ struct ocfs2_dinode *di;
+ struct ocfs2_truncate_log *tl;
+ unsigned int tl_count;

inode = ocfs2_get_system_file_inode(osb,
TRUNCATE_LOG_SYSTEM_INODE,
@@ -6171,6 +6174,18 @@ static int ocfs2_get_truncate_log_info(struct ocfs2_super *osb,
goto bail;
}

+ di = (struct ocfs2_dinode *)bh->b_data;
+ tl = &di->id2.i_dealloc;
+ tl_count = le16_to_cpu(tl->tl_count);
+
+ if (unlikely(tl_count > ocfs2_truncate_recs_per_inode(osb->sb) ||
+ tl_count == 0)) {
+ status = -EFSCORRUPTED;
+ iput(inode);
+ mlog_errno(status);
+ goto bail;
+ }
+
*tl_inode = inode;
*tl_bh = bh;
bail:

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in ocfs2_truncate_log_append

(syz.0.15,5809,0):ocfs2_truncate_log_append:5874 ERROR: bug expression: tl_count > ocfs2_truncate_recs_per_inode(osb->sb) || tl_count == 0
(syz.0.15,5809,0):ocfs2_truncate_log_append:5874 ERROR: Truncate record count on #77 invalid wanted 39, actual 2087

------------[ cut here ]------------
kernel BUG at fs/ocfs2/alloc.c:5874!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI

CPU: 0 UID: 0 PID: 5809 Comm: syz.0.15 Not tainted 6.13.0-rc5-syzkaller-gfc033cf25e61-dirty #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_truncate_log_append+0x9a8/0x9c0 fs/ocfs2/alloc.c:5868

Code: bc 24 a0 00 00 00 48 c7 c6 dd 83 0d 8e ba f2 16 00 00 48 c7 c1 40 4a 47 8c 4d 89 f0 41 89 d9 50 e8 6d 7d 20 00 48 83 c4 08 90 <0f> 0b e8 11 bf 21 fe 90 0f 0b e8 09 bf 21 fe 90 0f 0b e8 c1 24 40
RSP: 0018:ffffc900027def60 EFLAGS: 00010296
RAX: d6f52f3429698400 RBX: 0000000000000027 RCX: d6f52f3429698400

RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000

RBP: ffffc900027df090 R08: ffffffff817f0a3c R09: 1ffff11003f8519a
R10: dffffc0000000000 R11: ffffed1003f8519b R12: 1ffff11009d5dd58
R13: ffffff3800000000 R14: 000000000000004d R15: ffff88801227c008
FS: 00007f02de6956c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000002000f000 CR3: 00000000444da000 CR4: 0000000000352ef0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
ocfs2_remove_btree_range+0x1303/0x1860 fs/ocfs2/alloc.c:5789

ocfs2_remove_inode_range+0xff3/0x29c0 fs/ocfs2/file.c:1907

ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4537 [inline]
ocfs2_reflink_remap_blocks+0xcd4/0x1f30 fs/ocfs2/refcounttree.c:4684

ocfs2_remap_file_range+0x5fa/0x8d0 fs/ocfs2/file.c:2740
vfs_copy_file_range+0xc07/0x1510 fs/read_write.c:1584
__do_sys_copy_file_range fs/read_write.c:1670 [inline]
__se_sys_copy_file_range+0x3fa/0x600 fs/read_write.c:1637

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: 0033:0x7f02dd97e719
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:00007f02de695038 EFLAGS: 00000246 ORIG_RAX: 0000000000000146
RAX: ffffffffffffffda RBX: 00007f02ddb35f80 RCX: 00007f02dd97e719

RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004

RBP: 00007f02dd9f132e R08: 000000000000d8c2 R09: 0000000000000000
R10: 0000000020000640 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f02ddb35f80 R15: 00007ffc7cf04758

</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_truncate_log_append+0x9a8/0x9c0 fs/ocfs2/alloc.c:5868

Code: bc 24 a0 00 00 00 48 c7 c6 dd 83 0d 8e ba f2 16 00 00 48 c7 c1 40 4a 47 8c 4d 89 f0 41 89 d9 50 e8 6d 7d 20 00 48 83 c4 08 90 <0f> 0b e8 11 bf 21 fe 90 0f 0b e8 09 bf 21 fe 90 0f 0b e8 c1 24 40
RSP: 0018:ffffc900027def60 EFLAGS: 00010296
RAX: d6f52f3429698400 RBX: 0000000000000027 RCX: d6f52f3429698400

RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000

RBP: ffffc900027df090 R08: ffffffff817f0a3c R09: 1ffff11003f8519a
R10: dffffc0000000000 R11: ffffed1003f8519b R12: 1ffff11009d5dd58
R13: ffffff3800000000 R14: 000000000000004d R15: ffff88801227c008
FS: 00007f02de6956c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000002000f000 CR3: 00000000444da000 CR4: 0000000000352ef0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Tested on:

commit: fc033cf2 Linux 6.13-rc5
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1136aaf8580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f52ce141d88125fd

dashboard link: https://syzkaller.appspot.com/bug?extid=a66542ca5ebb4233b563
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=10ffa818580000

[Glass Su]

I don’t get why the patch: https://syzkaller.appspot.com/x/patch.diff?x=10ffa818580000 is wrong.

#syz test: https://github.com/Damenly/linux ocfs2-syz

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in ocfs2_truncate_log_append

(syz.0.15,5818,0):ocfs2_truncate_log_append:5874 ERROR: bug expression: tl_count > ocfs2_truncate_recs_per_inode(osb->sb) || tl_count == 0
(syz.0.15,5818,0):ocfs2_truncate_log_append:5874 ERROR: Truncate record count on #77 invalid wanted 39, actual 2087

------------[ cut here ]------------
kernel BUG at fs/ocfs2/alloc.c:5874!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI

CPU: 0 UID: 0 PID: 5818 Comm: syz.0.15 Not tainted 6.13.0-rc4-syzkaller-g7dace56f464b #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_truncate_log_append+0x9a8/0x9c0 fs/ocfs2/alloc.c:5868

Code: bc 24 a0 00 00 00 48 c7 c6 0f 85 0d 8e ba f2 16 00 00 48 c7 c1 00 4b 47 8c 4d 89 f0 41 89 d9 50 e8 ed 7d 20 00 48 83 c4 08 90 <0f> 0b e8 91 bd 21 fe 90 0f 0b e8 89 bd 21 fe 90 0f 0b e8 e1 22 40
RSP: 0018:ffffc90002a7ef60 EFLAGS: 00010296
RAX: 3de6beb9eda26200 RBX: 0000000000000027 RCX: 3de6beb9eda26200

RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000

RBP: ffffc90002a7f090 R08: ffffffff817f0a8c R09: 1ffff9200054fd5c
R10: dffffc0000000000 R11: fffff5200054fd5d R12: 1ffff11007e58958
R13: ffffff3800000000 R14: 000000000000004d R15: ffff88804f32c008
FS: 00007f7dae2556c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000002000f000 CR3: 0000000056b52000 CR4: 0000000000352ef0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
ocfs2_remove_btree_range+0x1303/0x1860 fs/ocfs2/alloc.c:5789
ocfs2_remove_inode_range+0xff3/0x29c0 fs/ocfs2/file.c:1907
ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4537 [inline]
ocfs2_reflink_remap_blocks+0xcd4/0x1f30 fs/ocfs2/refcounttree.c:4684
ocfs2_remap_file_range+0x5fa/0x8d0 fs/ocfs2/file.c:2740
vfs_copy_file_range+0xc07/0x1510 fs/read_write.c:1584
__do_sys_copy_file_range fs/read_write.c:1670 [inline]
__se_sys_copy_file_range+0x3fa/0x600 fs/read_write.c:1637
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: 0033:0x7f7dad37e719

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:00007f7dae255038 EFLAGS: 00000246 ORIG_RAX: 0000000000000146
RAX: ffffffffffffffda RBX: 00007f7dad535f80 RCX: 00007f7dad37e719

RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004

RBP: 00007f7dad3f132e R08: 000000000000d8c2 R09: 0000000000000000

R10: 0000000020000640 R11: 0000000000000246 R12: 0000000000000000

R13: 0000000000000000 R14: 00007f7dad535f80 R15: 00007ffffb564de8

</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_truncate_log_append+0x9a8/0x9c0 fs/ocfs2/alloc.c:5868

Code: bc 24 a0 00 00 00 48 c7 c6 0f 85 0d 8e ba f2 16 00 00 48 c7 c1 00 4b 47 8c 4d 89 f0 41 89 d9 50 e8 ed 7d 20 00 48 83 c4 08 90 <0f> 0b e8 91 bd 21 fe 90 0f 0b e8 89 bd 21 fe 90 0f 0b e8 e1 22 40
RSP: 0018:ffffc90002a7ef60 EFLAGS: 00010296
RAX: 3de6beb9eda26200 RBX: 0000000000000027 RCX: 3de6beb9eda26200

RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000

RBP: ffffc90002a7f090 R08: ffffffff817f0a8c R09: 1ffff9200054fd5c
R10: dffffc0000000000 R11: fffff5200054fd5d R12: 1ffff11007e58958
R13: ffffff3800000000 R14: 000000000000004d R15: ffff88804f32c008
FS: 00007f7dae2556c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000002000f000 CR3: 0000000056b52000 CR4: 0000000000352ef0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit: 7dace56f ocfs2: check dir i_size in ocfs2_find_entry
git tree: https://github.com/Damenly/linux ocfs2-syz
console output: https://syzkaller.appspot.com/x/log.txt?x=12b4b9c4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e5ad6ebf66b1e197

dashboard link: https://syzkaller.appspot.com/bug?extid=a66542ca5ebb4233b563
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.

[Glass Su]

#syz test: https://github.com/Damenly/linux ocfs2-syz

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+a66542...@syzkaller.appspotmail.com
Tested-by: syzbot+a66542...@syzkaller.appspotmail.com

Tested on:

commit: e957aa27 ocfs2: for syz

git tree: https://github.com/Damenly/linux ocfs2-syz

console output: https://syzkaller.appspot.com/x/log.txt?x=136544b0580000

kernel config: https://syzkaller.appspot.com/x/.config?x=e5ad6ebf66b1e197
dashboard link: https://syzkaller.appspot.com/bug?extid=a66542ca5ebb4233b563
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.

Note: testing is done by a robot and is best-effort only.