linux-kernel - Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log

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Message-Id: <1A32B849-6C84-44AD-8747-CF3983926C29@suse.com>
Date: Mon, 6 Jan 2025 14:10:52 +0800
From: Glass Su <glass.su@...e.com>
To: syzbot <syzbot+a66542ca5ebb4233b563@...kaller.appspotmail.com>
Cc: jlbec@...lplan.org,
 Joseph Qi <joseph.qi@...ux.alibaba.com>,
 linux-kernel@...r.kernel.org,
 mark@...heh.com,
 ocfs2-devel@...ts.linux.dev,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_append



> On Dec 30, 2024, at 10:40, syzbot <syzbot+a66542ca5ebb4233b563@...kaller.appspotmail.com> wrote:
> 
> 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
> 

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