------------[ cut here ]------------
kernel BUG at fs/ocfs2/alloc.c:5581!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5320 Comm: syz.0.0 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 cc 3e 8a fe e9 86 fa ff ff e8 b2 fe 22 fe 90 <0f> 0b f3 0f 1e fa 44 89 6c 24 10 65 8b 1d 63 eb d1 0e bf 07 00 00
RSP: 0018:ffffc9000d2e6980 EFLAGS: 00010287
RAX: ffffffff839d14be RBX: ffffc9000d2e7178 RCX: 0000000000100000
RDX: ffffc9000e713000 RSI: 000000000001f269 RDI: 000000000001f26a
RBP: ffffc9000d2e6cd0 R08: ffff888000d62480 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000002 R12: 1ffff1100a46f0da
R13: 0000000000000007 R14: ffff8880523786d0 R15: dffffc0000000000
FS:  00007f42568976c0(0000) GS:ffff88808d730000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556fbb0e28 CR3: 0000000043012000 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:7372
 ocfs2_truncate_file+0xca2/0x1420 fs/ocfs2/file.c:509
 ocfs2_setattr+0x1520/0x1b40 fs/ocfs2/file.c:1212
 notify_change+0xc1a/0xf40 fs/attr.c:546
 do_truncate+0x1a4/0x220 fs/open.c:68
 handle_truncate fs/namei.c:3596 [inline]
 do_open fs/namei.c:3979 [inline]
 path_openat+0x306c/0x3830 fs/namei.c:4134
 do_filp_open+0x1fa/0x410 fs/namei.c:4161
 do_sys_openat2+0x121/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_creat fs/open.c:1530 [inline]
 __se_sys_creat fs/open.c:1524 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1524
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f425598f6c9
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:00007f4256897038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f4255be6090 RCX: 00007f425598f6c9
RDX: 0000000000000000 RSI: 0000000000000700 RDI: 0000200000000040
RBP: 00007f4255a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4255be6128 R14: 00007f4255be6090 R15: 00007fffd4dd4b88
 </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 cc 3e 8a fe e9 86 fa ff ff e8 b2 fe 22 fe 90 <0f> 0b f3 0f 1e fa 44 89 6c 24 10 65 8b 1d 63 eb d1 0e bf 07 00 00
RSP: 0018:ffffc9000d2e6980 EFLAGS: 00010287
RAX: ffffffff839d14be RBX: ffffc9000d2e7178 RCX: 0000000000100000
RDX: ffffc9000e713000 RSI: 000000000001f269 RDI: 000000000001f26a
RBP: ffffc9000d2e6cd0 R08: ffff888000d62480 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000002 R12: 1ffff1100a46f0da
R13: 0000000000000007 R14: ffff8880523786d0 R15: dffffc0000000000
FS:  00007f42568976c0(0000) GS:ffff88808d730000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4249ea8000 CR3: 0000000043012000 CR4: 0000000000352ef0