------------[ cut here ]------------
kernel BUG at fs/ocfs2/uptodate.c:509!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5368 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 23 be 74 fe 4d 8b 1e 48 89 df 5b 41 5c 41 5d 41 5e 41 5f 5d 41 ff e3 cc 66 90 e8 d8 cc 0f fe 90 <0f> 0b e8 d0 cc 0f fe 90 0f 0b e8 c8 cc 0f fe 90 0f 0b e8 c0 cc 0f
RSP: 0000:ffffc9000d42daa8 EFLAGS: 00010293
RAX: ffffffff83b00038 RBX: ffff888043a30830 RCX: ffff88800082a440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8fc3c537 R09: 1ffffffff1f878a6
R10: dffffc0000000000 R11: fffffbfff1f878a7 R12: 1ffff92001a85b88
R13: dffffc0000000000 R14: ffff888043a54658 R15: ffff888043a54658
FS:  0000000000000000(0000) GS:ffff88808d00a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3dbea81880 CR3: 0000000051bb2000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_extend_dir+0x1172/0x4870 fs/ocfs2/dir.c:3309
 ocfs2_prepare_dx_dir_for_insert fs/ocfs2/dir.c:4232 [inline]
 ocfs2_prepare_dir_for_insert+0x3d7b/0x5450 fs/ocfs2/dir.c:4288
 ocfs2_mknod+0x819/0x2050 fs/ocfs2/namei.c:297
 ocfs2_create+0x1a5/0x440 fs/ocfs2/namei.c:676
 lookup_open fs/namei.c:3708 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0x14f1/0x3830 fs/namei.c:4043
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 file_open_name fs/open.c:1379 [inline]
 filp_open+0x176/0x1d0 fs/open.c:1399
 coredump_file+0x33e/0xaf0 fs/coredump.c:931
 vfs_coredump+0x1688/0x2a50 fs/coredump.c:1141
 get_signal+0x1109/0x1340 kernel/signal.c:3019
 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: 0033:0x7f3dbda4f927
Code: 88 15 d2 5d eb 00 88 05 cf 5d eb 00 c3 50 48 8d 35 01 25 1c 00 48 8d 3d 07 25 1c 00 31 c0 e8 20 f7 ff ff 53 89 fb 48 83 ec 10 <64> 8b 04 25 94 ff ff ff 85 c0 74 2a 89 fe 31 c0 bf 3c 00 00 00 e8
RSP: 002b:00007f3dbea821a0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f3dbdb8eba9
RDX: 00007f3dbea821c0 RSI: 00007f3dbea822f0 RDI: 000000000000000b
RBP: 00007f3dbdc11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f3dbddd6038 R14: 00007f3dbddd5fa0 R15: 00007ffdf91cd138
 </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 23 be 74 fe 4d 8b 1e 48 89 df 5b 41 5c 41 5d 41 5e 41 5f 5d 41 ff e3 cc 66 90 e8 d8 cc 0f fe 90 <0f> 0b e8 d0 cc 0f fe 90 0f 0b e8 c8 cc 0f fe 90 0f 0b e8 c0 cc 0f
RSP: 0000:ffffc9000d42daa8 EFLAGS: 00010293
RAX: ffffffff83b00038 RBX: ffff888043a30830 RCX: ffff88800082a440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8fc3c537 R09: 1ffffffff1f878a6
R10: dffffc0000000000 R11: fffffbfff1f878a7 R12: 1ffff92001a85b88
R13: dffffc0000000000 R14: ffff888043a54658 R15: ffff888043a54658
FS:  0000000000000000(0000) GS:ffff88808d00a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3dbea81880 CR3: 0000000051bb2000 CR4: 0000000000352ef0