------------[ cut here ]------------
kernel BUG at fs/ocfs2/aops.c:1161!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5346 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 04/01/2014
RIP: 0010:ocfs2_write_cluster fs/ocfs2/aops.c:1161 [inline]
RIP: 0010:ocfs2_write_cluster_by_desc+0x1db4/0x1de0 fs/ocfs2/aops.c:1221
Code: 00 48 c7 c6 16 8e 02 8e ba 6c 04 00 00 48 c7 c1 20 91 12 8c e8 4d d0 1c 00 48 8b 04 24 c6 40 1e f8 90 0f 0b e8 3d 82 07 fe 90 <0f> 0b e8 35 82 07 fe 90 0f 0b e8 2d 82 07 fe 90 0f 0b e8 25 82 07
RSP: 0018:ffffc9000db2dcc0 EFLAGS: 00010293
RAX: ffffffff83be5c83 RBX: ffff888042872014 RCX: ffff88801fb12500
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000db2dff0 R08: ffff888047b92313 R09: 1ffff11008f72462
R10: dffffc0000000000 R11: ffffed1008f72463 R12: ffff888035ec8000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888042872014
FS:  00007f8bb3c956c0(0000) GS:ffff88808c812000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002c40 CR3: 0000000044df5000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_write_begin_nolock+0x3305/0x41a0 fs/ocfs2/aops.c:1797
 ocfs2_write_begin+0x1c5/0x320 fs/ocfs2/aops.c:1885
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4324
 ocfs2_file_write_iter+0x1663/0x1e70 fs/ocfs2/file.c:2476
 __kernel_write_iter+0x41e/0x880 fs/read_write.c:621
 dump_emit_page fs/coredump.c:1304 [inline]
 dump_user_range+0xc19/0x12c0 fs/coredump.c:1378
 elf_core_dump+0x34c2/0x3ad0 fs/binfmt_elf.c:2109
 coredump_write+0x1216/0x1910 fs/coredump.c:1053
 do_coredump fs/coredump.c:1132 [inline]
 vfs_coredump+0x3807/0x4530 fs/coredump.c:1206
 get_signal+0x1107/0x1330 kernel/signal.c:3022
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:252 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:323 [inline]
 irqentry_exit+0x284/0x730 kernel/entry/common.c:162
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f8bb2d9c821
Code: 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffea0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f8bb3015fa0 RCX: 00007f8bb2d9c819
RDX: 0000000000000000 RSI: fffffffffffffea0 RDI: 0000000000000000
RBP: 00007f8bb2e32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8bb3016038 R14: 00007f8bb3015fa0 R15: 00007ffe4b9e82b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_write_cluster fs/ocfs2/aops.c:1161 [inline]
RIP: 0010:ocfs2_write_cluster_by_desc+0x1db4/0x1de0 fs/ocfs2/aops.c:1221
Code: 00 48 c7 c6 16 8e 02 8e ba 6c 04 00 00 48 c7 c1 20 91 12 8c e8 4d d0 1c 00 48 8b 04 24 c6 40 1e f8 90 0f 0b e8 3d 82 07 fe 90 <0f> 0b e8 35 82 07 fe 90 0f 0b e8 2d 82 07 fe 90 0f 0b e8 25 82 07
RSP: 0018:ffffc9000db2dcc0 EFLAGS: 00010293
RAX: ffffffff83be5c83 RBX: ffff888042872014 RCX: ffff88801fb12500
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000db2dff0 R08: ffff888047b92313 R09: 1ffff11008f72462
R10: dffffc0000000000 R11: ffffed1008f72463 R12: ffff888035ec8000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888042872014
FS:  00007f8bb3c956c0(0000) GS:ffff88808c812000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8bb3c72f98 CR3: 0000000044df5000 CR4: 0000000000352ef0