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kernel BUG at fs/ocfs2/uptodate.c:509!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5344 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_set_new_buffer_uptodate+0x149/0x170 fs/ocfs2/uptodate.c:509
Code: 80 3c 20 00 74 08 4c 89 f7 e8 83 9d 71 fe 4d 8b 1e 48 89 df 5b 41 5c 41 5d 41 5e 41 5f 5d 41 ff e3 cc cc cc e8 a8 ff 09 fe 90 <0f> 0b e8 a0 ff 09 fe 90 0f 0b e8 98 ff 09 fe 90 0f 0b e8 90 ff 09
RSP: 0018:ffffc9000d6c6988 EFLAGS: 00010293
RAX: ffffffff83b75b78 RBX: ffff888052080830 RCX: ffff888000950000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8f815177 R09: 1ffffffff1f02a2e
R10: dffffc0000000000 R11: fffffbfff1f02a2f R12: 1ffff92001ad8d64
R13: dffffc0000000000 R14: ffff888043aff658 R15: ffff888043aff658
FS:  00007fc7d016c6c0(0000) GS:ffff88808d683000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000042db2000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_extend_dir+0x115b/0x4850 fs/ocfs2/dir.c:3309
 ocfs2_prepare_dx_dir_for_insert fs/ocfs2/dir.c:4232 [inline]
 ocfs2_prepare_dir_for_insert+0x3d4e/0x5420 fs/ocfs2/dir.c:4288
 ocfs2_mknod+0x80e/0x2030 fs/ocfs2/namei.c:297
 ocfs2_mkdir+0x181/0x420 fs/ocfs2/namei.c:659
 vfs_mkdir+0x512/0x5b0 fs/namei.c:5130
 do_mkdirat+0x276/0x4b0 fs/namei.c:5164
 __do_sys_mkdirat fs/namei.c:5186 [inline]
 __se_sys_mkdirat fs/namei.c:5184 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:5184
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc7cf38f7c9
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:00007fc7d016c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fc7cf5e6180 RCX: 00007fc7cf38f7c9
RDX: 0000000000000100 RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007fc7cf413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc7cf5e6218 R14: 00007fc7cf5e6180 R15: 00007ffe8f464d88
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_set_new_buffer_uptodate+0x149/0x170 fs/ocfs2/uptodate.c:509
Code: 80 3c 20 00 74 08 4c 89 f7 e8 83 9d 71 fe 4d 8b 1e 48 89 df 5b 41 5c 41 5d 41 5e 41 5f 5d 41 ff e3 cc cc cc e8 a8 ff 09 fe 90 <0f> 0b e8 a0 ff 09 fe 90 0f 0b e8 98 ff 09 fe 90 0f 0b e8 90 ff 09
RSP: 0018:ffffc9000d6c6988 EFLAGS: 00010293
RAX: ffffffff83b75b78 RBX: ffff888052080830 RCX: ffff888000950000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8f815177 R09: 1ffffffff1f02a2e
R10: dffffc0000000000 R11: fffffbfff1f02a2f R12: 1ffff92001ad8d64
R13: dffffc0000000000 R14: ffff888043aff658 R15: ffff888043aff658
FS:  00007fc7d016c6c0(0000) GS:ffff88808d683000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000042db2000 CR4: 0000000000352ef0