Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_append

[syzbot <syzbot+a66542ca5ebb4233b563@syzkaller.appspotmail.com>]

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.