linux-kernel - Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_remove

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Message-ID: <68b10769.050a0220.3db4df.00f3.GAE@google.com>
Date: Thu, 28 Aug 2025 18:50:33 -0700
From: syzbot <syzbot+8882b2f5f48a7170a726@...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: Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_remove_extent

syzbot has found a reproducer for the following issue on:

HEAD commit:    07d9df80082b Merge tag 'perf-tools-fixes-for-v6.17-2025-08..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17bdfc42580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a7016efe6aaa498c
dashboard link: https://syzkaller.appspot.com/bug?extid=8882b2f5f48a7170a726
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=115a4262580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13087ef0580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-07d9df80.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/64a01edfb5ff/vmlinux-07d9df80.xz
kernel image: https://storage.googleapis.com/syzbot-assets/78c915400ff9/bzImage-07d9df80.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/7dc3c9b29fa5/mount_0.gz
  fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=165a4262580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8882b2f5f48a7170a726@...kaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/ocfs2/alloc.c:5581!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5722 Comm: syz.0.17 Not tainted syzkaller #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_remove_extent+0x1ecf/0x2020 fs/ocfs2/alloc.c:5581
Code: fa ff ff 48 8b 4c 24 08 80 e1 07 fe c1 38 c1 0f 8c 95 fa ff ff 48 8b 7c 24 08 e8 4c 35 8d fe e9 86 fa ff ff e8 f2 48 28 fe 90 <0f> 0b f3 0f 1e fa 44 89 6c 24 10 65 8b 1d d3 9d 09 0f bf 07 00 00
RSP: 0018:ffffc9000d56e640 EFLAGS: 00010293
RAX: ffffffff8397724e RBX: ffffc9000d56ee38 RCX: ffff88803eab8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000007
RBP: ffffc9000d56e990 R08: ffff88803eab8000 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000000 R12: 1ffff11008b38e9a
R13: 0000000000000007 R14: ffff8880459c74d0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88808d20f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2cce600218 CR3: 000000004b419000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_remove_btree_range+0xdef/0x1540 fs/ocfs2/alloc.c:5778
 ocfs2_commit_truncate+0xb64/0x21d0 fs/ocfs2/alloc.c:7373
 ocfs2_truncate_for_delete fs/ocfs2/inode.c:699 [inline]
 ocfs2_wipe_inode fs/ocfs2/inode.c:866 [inline]
 ocfs2_delete_inode fs/ocfs2/inode.c:1155 [inline]
 ocfs2_evict_inode+0x1138/0x40e0 fs/ocfs2/inode.c:1292
 evict+0x501/0x9c0 fs/inode.c:810
 ocfs2_dentry_iput+0x247/0x370 fs/ocfs2/dcache.c:407
 __dentry_kill+0x209/0x660 fs/dcache.c:669
 dput+0x19f/0x2b0 fs/dcache.c:911
 __fput+0x68e/0xa70 fs/file_table.c:476
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x2300 kernel/exit.c:961
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 get_signal+0x1286/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:40 [inline]
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 irqentry_exit_to_user_mode+0x81/0x120 kernel/entry/common.c:73
 exc_page_fault+0x9f/0xf0 arch/x86/mm/fault.c:1535
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f018c18ebf1
Code: Unable to access opcode bytes at 0x7f018c18ebc7.
RSP: 002b:00000000fffffeb0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f018c3b5fa0 RCX: 00007f018c18ebe9
RDX: 0000000000000000 RSI: 00000000fffffeb0 RDI: 0000000002000400
RBP: 00007f018c211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f018c3b6038 R14: 00007f018c3b5fa0 R15: 00007ffc298dcef8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_remove_extent+0x1ecf/0x2020 fs/ocfs2/alloc.c:5581
Code: fa ff ff 48 8b 4c 24 08 80 e1 07 fe c1 38 c1 0f 8c 95 fa ff ff 48 8b 7c 24 08 e8 4c 35 8d fe e9 86 fa ff ff e8 f2 48 28 fe 90 <0f> 0b f3 0f 1e fa 44 89 6c 24 10 65 8b 1d d3 9d 09 0f bf 07 00 00
RSP: 0018:ffffc9000d56e640 EFLAGS: 00010293
RAX: ffffffff8397724e RBX: ffffc9000d56ee38 RCX: ffff88803eab8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000007
RBP: ffffc9000d56e990 R08: ffff88803eab8000 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000000 R12: 1ffff11008b38e9a
R13: 0000000000000007 R14: ffff8880459c74d0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88808d20f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f67141f3000 CR3: 00000000333eb000 CR4: 0000000000352ef0


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.