------------[ cut here ]------------
kernel BUG at fs/ocfs2/aops.c:1161!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5330 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+0x1da7/0x1dd0 fs/ocfs2/aops.c:1221
Code: 48 c7 c6 ac d2 03 8e ba 6c 04 00 00 48 c7 c1 20 20 13 8c e8 db eb 1c 00 48 8b 44 24 10 c6 40 1e f8 90 0f 0b e8 4a 30 01 fe 90 <0f> 0b e8 42 30 01 fe 90 0f 0b e8 3a 30 01 fe 90 0f 0b e8 32 30 01
RSP: 0018:ffffc9000582dd60 EFLAGS: 00010293
RAX: ffffffff83c55186 RBX: ffff888043e80888 RCX: ffff888000f48000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000582e0b0 R08: ffff888043e80713 R09: 1ffff110087d00e2
R10: dffffc0000000000 R11: ffffed10087d00e3 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880542f4014 R15: 0000000000000000
FS:  00007f669c03c6c0(0000) GS:ffff88808c81b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc34601000 CR3: 00000000431c3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_write_begin_nolock+0x3346/0x41f0 fs/ocfs2/aops.c:1797
 ocfs2_write_begin+0x1ba/0x310 fs/ocfs2/aops.c:1885
 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4358
 ocfs2_file_write_iter+0x1706/0x1f10 fs/ocfs2/file.c:2481
 __kernel_write_iter+0x44a/0x8f0 fs/read_write.c:621
 dump_emit_page fs/coredump.c:1298 [inline]
 dump_user_range+0xc19/0x12c0 fs/coredump.c:1372
 elf_core_dump+0x3485/0x3a90 fs/binfmt_elf.c:2109
 coredump_write+0x1290/0x1960 fs/coredump.c:1052
 do_coredump fs/coredump.c:1131 [inline]
 vfs_coredump+0x36ff/0x44b0 fs/coredump.c:1200
 get_signal+0x1094/0x12c0 kernel/signal.c:3023
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:101 [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:244 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
 irqentry_exit+0x2ba/0x8f0 kernel/entry/common.c:165
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f669b19ce61
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:00000000fffffeb0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f669b415fa0 RCX: 00007f669b19ce59
RDX: 0000000000000000 RSI: 00000000fffffeb0 RDI: 0000000002000400
RBP: 00007f669b232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f669b416038 R14: 00007f669b415fa0 R15: 00007ffc5aef52b8
 </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+0x1da7/0x1dd0 fs/ocfs2/aops.c:1221
Code: 48 c7 c6 ac d2 03 8e ba 6c 04 00 00 48 c7 c1 20 20 13 8c e8 db eb 1c 00 48 8b 44 24 10 c6 40 1e f8 90 0f 0b e8 4a 30 01 fe 90 <0f> 0b e8 42 30 01 fe 90 0f 0b e8 3a 30 01 fe 90 0f 0b e8 32 30 01
RSP: 0018:ffffc9000582dd60 EFLAGS: 00010293
RAX: ffffffff83c55186 RBX: ffff888043e80888 RCX: ffff888000f48000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000582e0b0 R08: ffff888043e80713 R09: 1ffff110087d00e2
R10: dffffc0000000000 R11: ffffed10087d00e3 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880542f4014 R15: 0000000000000000
FS:  00007f669c03c6c0(0000) GS:ffff88808c81b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc34601000 CR3: 00000000431c3000 CR4: 0000000000352ef0