------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:1443!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5357 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_find_victim_chain fs/ocfs2/suballoc.c:1443 [inline]
RIP: 0010:ocfs2_claim_suballoc_bits+0x243c/0x2450 fs/ocfs2/suballoc.c:1996
Code: c2 fb ff ff e8 05 b7 16 fe 90 0f 0b e8 fd b6 16 fe 90 0f 0b e8 f5 b6 16 fe 90 0f 0b e8 ed b6 16 fe 90 0f 0b e8 e5 b6 16 fe 90 <0f> 0b e8 dd b6 16 fe 90 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc9000d3be9a0 EFLAGS: 00010293
RAX: ffffffff83a9065b RBX: 0000000000000000 RCX: ffff888000a30000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000d3bec30 R08: ffffc9000d3becc0 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: ffff888011d1ad08
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff110023a35a1
FS:  0000555572803500(0000) GS:ffff88808d007000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000005f00 CR3: 0000000011477000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __ocfs2_claim_clusters+0x303/0x8f0 fs/ocfs2/suballoc.c:2421
 ocfs2_local_alloc_new_window fs/ocfs2/localalloc.c:1166 [inline]
 ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1295 [inline]
 ocfs2_reserve_local_alloc_bits+0x12be/0x24e0 fs/ocfs2/localalloc.c:669
 ocfs2_reserve_clusters_with_limit+0x1be/0xba0 fs/ocfs2/suballoc.c:1168
 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1229 [inline]
 ocfs2_lock_allocators+0x2fa/0x5c0 fs/ocfs2/suballoc.c:2772
 ocfs2_write_begin_nolock+0x2279/0x4340 fs/ocfs2/aops.c:1719
 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:93 [inline]
 ocfs2_page_mkwrite+0x600/0xc40 fs/ocfs2/mmap.c:144
 do_page_mkwrite+0x14a/0x310 mm/memory.c:3361
 do_shared_fault mm/memory.c:5649 [inline]
 do_fault mm/memory.c:5711 [inline]
 do_pte_missing mm/memory.c:4234 [inline]
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x1916/0x5440 mm/memory.c:6195
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364
 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f120aa55321
Code: 48 8b 54 24 08 48 85 d2 74 17 8b 44 24 18 0f c8 89 c0 48 89 44 24 18 48 83 fa 01 0f 85 b3 01 00 00 48 8b 44 24 10 8b 54 24 18 <89> 10 e9 15 fd ff ff 48 8b 44 24 10 8b 10 48 8b 44 24 08 48 85 c0
RSP: 002b:00007ffdb054c460 EFLAGS: 00010246
RAX: 0000200000005f00 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000060 RSI: 0000000000000000 RDI: 00005555728033c8
RBP: 00007ffdb054c568 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 00007f120ade5fac
R13: 00007f120ade5fa0 R14: fffffffffffffffe R15: 00007ffdb054c5b0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1443 [inline]
RIP: 0010:ocfs2_claim_suballoc_bits+0x243c/0x2450 fs/ocfs2/suballoc.c:1996
Code: c2 fb ff ff e8 05 b7 16 fe 90 0f 0b e8 fd b6 16 fe 90 0f 0b e8 f5 b6 16 fe 90 0f 0b e8 ed b6 16 fe 90 0f 0b e8 e5 b6 16 fe 90 <0f> 0b e8 dd b6 16 fe 90 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc9000d3be9a0 EFLAGS: 00010293
RAX: ffffffff83a9065b RBX: 0000000000000000 RCX: ffff888000a30000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000d3bec30 R08: ffffc9000d3becc0 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: ffff888011d1ad08
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff110023a35a1
FS:  0000555572803500(0000) GS:ffff88808d007000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000005f00 CR3: 0000000011477000 CR4: 0000000000352ef0