------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4787!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5332 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:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4787
Code: e8 c4 4b a8 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 60 6f 40 ff 90 0f 0b e8 58 6f 40 ff 90 0f 0b e8 50 6f 40 ff 90 <0f> 0b e8 48 6f 40 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000bcc73a8 EFLAGS: 00010293
RAX: ffffffff82815100 RBX: 00000000ffffffff RCX: ffff88801fbd0000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 1ffff11008cfdb46 R08: ffff8880467ee503 R09: 1ffff11008cfdca0
R10: dffffc0000000000 R11: ffffed1008cfdca1 R12: 0000000000000004
R13: 0000000000000002 R14: 1ffff11008cfdca3 R15: ffff8880467ee518
FS:  00007ffb1133e6c0(0000) GS:ffff88808d22f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffb1133dfc8 CR3: 000000003623c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ext4_mb_use_preallocated+0x660/0x13f0 fs/ext4/mballoc.c:5004
 ext4_mb_new_blocks+0x5a1/0x46a0 fs/ext4/mballoc.c:6308
 ext4_ext_map_blocks+0x1877/0x69c0 fs/ext4/extents.c:4383
 ext4_map_create_blocks fs/ext4/inode.c:613 [inline]
 ext4_map_blocks+0x82c/0x16f0 fs/ext4/inode.c:816
 ext4_alloc_file_blocks+0x422/0xdb0 fs/ext4/extents.c:4551
 ext4_zero_range+0x38c/0xb70 fs/ext4/extents.c:4644
 ext4_fallocate+0x334/0x3d0 fs/ext4/extents.c:4832
 vfs_fallocate+0x669/0x7e0 fs/open.c:339
 ksys_fallocate fs/open.c:363 [inline]
 __do_sys_fallocate fs/open.c:368 [inline]
 __se_sys_fallocate fs/open.c:366 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:366
 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: 0033:0x7ffb1058f7c9
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:00007ffb1133e038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007ffb107e6090 RCX: 00007ffb1058f7c9
RDX: 0000000000000fff RSI: 0000000000000011 RDI: 0000000000000004
RBP: 00007ffb10613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffb107e6128 R14: 00007ffb107e6090 R15: 00007ffc30bb7438
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4787
Code: e8 c4 4b a8 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 60 6f 40 ff 90 0f 0b e8 58 6f 40 ff 90 0f 0b e8 50 6f 40 ff 90 <0f> 0b e8 48 6f 40 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000bcc73a8 EFLAGS: 00010293
RAX: ffffffff82815100 RBX: 00000000ffffffff RCX: ffff88801fbd0000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 1ffff11008cfdb46 R08: ffff8880467ee503 R09: 1ffff11008cfdca0
R10: dffffc0000000000 R11: ffffed1008cfdca1 R12: 0000000000000004
R13: 0000000000000002 R14: 1ffff11008cfdca3 R15: ffff8880467ee518
FS:  00007ffb1133e6c0(0000) GS:ffff88808d22f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffb1133dfc8 CR3: 000000003623c000 CR4: 0000000000352ef0