Message-ID: <6832f633.a70a0220.253bc2.0087.GAE@google.com>
Date: Sun, 25 May 2025 03:51:31 -0700
From: syzbot <syzbot+7774dd506af3f6fb5df5@...kaller.appspotmail.com>
To: jlbec@...lplan.org, joseph.qi@...ux.alibaba.com, 
	linux-kernel@...r.kernel.org, mark@...heh.com, ocfs2-devel@...ts.linux.dev, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ocfs2?] kernel BUG in __ocfs2_decrease_refcount

Hello,

syzbot found the following issue on:

HEAD commit:    b36ddb9210e6 Merge tag 'for-linus-6.15-ofs2' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12fb69f4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9fd1c9848687d742
dashboard link: https://syzkaller.appspot.com/bug?extid=7774dd506af3f6fb5df5
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-b36ddb92.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2e5bf04315bb/vmlinux-b36ddb92.xz
kernel image: https://storage.googleapis.com/syzbot-assets/14f603b88226/bzImage-b36ddb92.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7774dd506af3f6fb5df5@...kaller.appspotmail.com

(syz.0.0,5319,0):ocfs2_dio_end_io:2398 ERROR: Direct IO failed, bytes = -28
------------[ cut here ]------------
kernel BUG at fs/ocfs2/refcounttree.c:2242!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted 6.15.0-rc7-syzkaller-00002-gb36ddb9210e6 #0 PREEMPT(full) 
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_decrease_refcount+0x1603/0x1780 fs/ocfs2/refcounttree.c:2242
Code: fe c6 05 07 19 cb 0b 01 90 48 c7 c7 40 5b aa 8b e8 52 34 e6 fd 90 0f 0b 90 90 e9 a7 eb ff ff e8 43 6c b8 07 e8 ae d7 21 fe 90 <0f> 0b e8 a6 d7 21 fe 90 0f 0b e8 9e d7 21 fe 90 0f 0b e8 96 d7 21
RSP: 0018:ffffc9000d3b6880 EFLAGS: 00010287
RAX: ffffffff839e1a22 RBX: 0000000000000000 RCX: 0000000000100000
RDX: ffffc9000e613000 RSI: 0000000000004b6e RDI: 0000000000004b6f
RBP: ffffc9000d3b6b40 R08: ffff88801f6da440 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000002 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffc9000d3b6930 R15: 0000000000000001
FS:  00007f9d9ebc46c0(0000) GS:ffff88808d6c2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555b9e1cb168 CR3: 00000000353f0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ocfs2_decrease_refcount+0x573/0x730 fs/ocfs2/refcounttree.c:2312
 ocfs2_remove_btree_range+0x11c0/0x1540 fs/ocfs2/alloc.c:5791
 ocfs2_commit_truncate+0xb64/0x21d0 fs/ocfs2/alloc.c:7373
 ocfs2_truncate_file+0xca2/0x1420 fs/ocfs2/file.c:509
 ocfs2_setattr+0x1520/0x1b40 fs/ocfs2/file.c:1212
 notify_change+0xb36/0xe40 fs/attr.c:552
 do_truncate+0x19a/0x220 fs/open.c:65
 handle_truncate fs/namei.c:3501 [inline]
 do_open fs/namei.c:3884 [inline]
 path_openat+0x306c/0x3830 fs/namei.c:4039
 do_filp_open+0x1fa/0x410 fs/namei.c:4066
 do_sys_openat2+0x121/0x1c0 fs/open.c:1429
 do_sys_open fs/open.c:1444 [inline]
 __do_sys_creat fs/open.c:1522 [inline]
 __se_sys_creat fs/open.c:1516 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1516
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9d9dd8e969
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:00007f9d9ebc4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f9d9dfb6080 RCX: 00007f9d9dd8e969
RDX: 0000000000000000 RSI: 0000000000000011 RDI: 00002000000002c0
RBP: 00007f9d9de10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9d9dfb6080 R15: 00007ffeb64bb688
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__ocfs2_decrease_refcount+0x1603/0x1780 fs/ocfs2/refcounttree.c:2242
Code: fe c6 05 07 19 cb 0b 01 90 48 c7 c7 40 5b aa 8b e8 52 34 e6 fd 90 0f 0b 90 90 e9 a7 eb ff ff e8 43 6c b8 07 e8 ae d7 21 fe 90 <0f> 0b e8 a6 d7 21 fe 90 0f 0b e8 9e d7 21 fe 90 0f 0b e8 96 d7 21
RSP: 0018:ffffc9000d3b6880 EFLAGS: 00010287
RAX: ffffffff839e1a22 RBX: 0000000000000000 RCX: 0000000000100000
RDX: ffffc9000e613000 RSI: 0000000000004b6e RDI: 0000000000004b6f
RBP: ffffc9000d3b6b40 R08: ffff88801f6da440 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000002 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffc9000d3b6930 R15: 0000000000000001
FS:  00007f9d9ebc46c0(0000) GS:ffff88808d6c2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555b9e1cb168 CR3: 00000000353f0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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