linux-kernel - Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_write_cluster_by

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Message-ID: <66eaf3db.050a0220.252d9a.0018.GAE@google.com>
Date: Wed, 18 Sep 2024 08:38:03 -0700
From: syzbot <syzbot+18a87160c7d64ba2e2f6@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, pvmohammedanees2003@...il.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_write_cluster_by_desc

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in ocfs2_write_cluster_by_desc

loop0: detected capacity change from 0 to 32768
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/aops.c:1179!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5601 Comm: syz.0.16 Not tainted 6.11.0-syzkaller-05319-g4a39ac5b7d62-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_write_cluster fs/ocfs2/aops.c:1179 [inline]
RIP: 0010:ocfs2_write_cluster_by_desc+0x1fc7/0x1ff0 fs/ocfs2/aops.c:1240
Code: 03 48 8d bc 24 30 02 00 00 48 c7 c6 39 81 10 8e ba 7e 04 00 00 48 c7 c1 00 05 49 8c e8 92 94 1d 00 90 0f 0b e8 fa 7c 12 fe 90 <0f> 0b e8 f2 7c 12 fe 90 0f 0b e8 ea 7c 12 fe 90 0f 0b e8 e2 7c 12
RSP: 0018:ffffc90002126e20 EFLAGS: 00010293
RAX: ffffffff83816206 RBX: ffff888043dd96e0 RCX: ffff88801f7d4880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002127170 R08: ffffffff8381496e R09: 1ffff110087bb2ac
R10: dffffc0000000000 R11: ffffed10087bb2ad R12: 0000000000000000
R13: ffff8880130be000 R14: ffff888043dd96b8 R15: 0000000000000000
FS:  00007f815880c6c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020201000 CR3: 00000000232b0000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ocfs2_write_begin_nolock+0x3a2f/0x4ec0 fs/ocfs2/aops.c:1816
 ocfs2_write_begin+0x205/0x3a0 fs/ocfs2/aops.c:1903
 generic_perform_write+0x37e/0x730 mm/filemap.c:4025
 ocfs2_file_write_iter+0x17b1/0x1f50 fs/ocfs2/file.c:2456
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xa6d/0xc90 fs/read_write.c:683
 ksys_write+0x1a0/0x2c0 fs/read_write.c:736
 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: 0033:0x7f815797def9
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:00007f815880c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8157b35f80 RCX: 00007f815797def9
RDX: 000000000208e24b RSI: 0000000020000240 RDI: 0000000000000004
RBP: 00007f81579f0b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8157b35f80 R15: 00007ffe1f4b9668
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_write_cluster fs/ocfs2/aops.c:1179 [inline]
RIP: 0010:ocfs2_write_cluster_by_desc+0x1fc7/0x1ff0 fs/ocfs2/aops.c:1240
Code: 03 48 8d bc 24 30 02 00 00 48 c7 c6 39 81 10 8e ba 7e 04 00 00 48 c7 c1 00 05 49 8c e8 92 94 1d 00 90 0f 0b e8 fa 7c 12 fe 90 <0f> 0b e8 f2 7c 12 fe 90 0f 0b e8 ea 7c 12 fe 90 0f 0b e8 e2 7c 12
RSP: 0018:ffffc90002126e20 EFLAGS: 00010293
RAX: ffffffff83816206 RBX: ffff888043dd96e0 RCX: ffff88801f7d4880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002127170 R08: ffffffff8381496e R09: 1ffff110087bb2ac
R10: dffffc0000000000 R11: ffffed10087bb2ad R12: 0000000000000000
R13: ffff8880130be000 R14: ffff888043dd96b8 R15: 0000000000000000
FS:  00007f815880c6c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020201000 CR3: 00000000232b0000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit:         4a39ac5b Merge tag 'random-6.12-rc1-for-linus' of git:..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16817fc7980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b74c2037cf7ab6b0
dashboard link: https://syzkaller.appspot.com/bug?extid=18a87160c7d64ba2e2f6
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1550269f980000