Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_remove_extent

[syzbot <syzbot+8882b2f5f48a7170a726@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    2c923c845768 Add linux-next specific files for 20250619
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=153d9d0c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=58afc4b78b52b7e3
dashboard link: https://syzkaller.appspot.com/bug?extid=8882b2f5f48a7170a726
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11f23d0c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b4ef8488b2c5/disk-2c923c84.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/97fc575793ea/vmlinux-2c923c84.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b8095fa1838d/bzImage-2c923c84.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/3778419fa82a/mount_0.gz
  fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=1441f5d4580000)

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

------------[ cut here ]------------
kernel BUG at fs/ocfs2/alloc.c:5581!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 6023 Comm: syz.1.19 Not tainted 6.16.0-rc2-next-20250619-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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 7c 70 8e fe e9 86 fa ff ff e8 d2 49 2a fe 90 <0f> 0b f3 0f 1e fa 44 89 6c 24 10 65 8b 1d 63 61 09 0f bf 07 00 00
RSP: 0000:ffffc9000216e640 EFLAGS: 00010293
RAX: ffffffff83961ebe RBX: ffffc9000216ee38 RCX: ffff888034273c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000006
RBP: ffffc9000216e990 R08: ffff888034273c00 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000000 R12: 1ffff1100b8fb49a
R13: 0000000000000006 R14: ffff88805c7da4d0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125d28000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff5456df38 CR3: 0000000075e08000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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:637 [inline]
 ocfs2_wipe_inode fs/ocfs2/inode.c:804 [inline]
 ocfs2_delete_inode fs/ocfs2/inode.c:1093 [inline]
 ocfs2_evict_inode+0x1138/0x40e0 fs/ocfs2/inode.c:1230
 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+0x1d1/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x2300 kernel/exit.c:959
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1100
 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:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 irqentry_exit_to_user_mode+0x81/0x120 kernel/entry/common.c:184
 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: 0033:0x7f056b38e886
Code: Unable to access opcode bytes at 0x7f056b38e85c.
RSP: 002b:00007ffea35be310 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000058 RCX: 00007f056b38e929
RDX: 00007ffea35be350 RSI: 0000000000000000 RDI: 00000000000249f0
RBP: 00007f056b410b39 R08: 0000000000000000 R09: 0000000000000058
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f056b5b5fa0 R14: 00007f056b5b5fa0 R15: 0000000000000002
 </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 7c 70 8e fe e9 86 fa ff ff e8 d2 49 2a fe 90 <0f> 0b f3 0f 1e fa 44 89 6c 24 10 65 8b 1d 63 61 09 0f bf 07 00 00
RSP: 0000:ffffc9000216e640 EFLAGS: 00010293
RAX: ffffffff83961ebe RBX: ffffc9000216ee38 RCX: ffff888034273c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000006
RBP: ffffc9000216e990 R08: ffff888034273c00 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000000 R12: 1ffff1100b8fb49a
R13: 0000000000000006 R14: ffff88805c7da4d0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125d28000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7a6d9f37b0 CR3: 00000000338ec000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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