EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
EXT4-fs: Ignoring removed orlov option
EXT4-fs (loop0): can't enable nombcache during remount
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5969 at fs/ext4/mballoc.c:839 mb_avg_fragment_size_order fs/ext4/mballoc.c:839 [inline]
WARNING: CPU: 1 PID: 5969 at fs/ext4/mballoc.c:839 mb_update_avg_fragment_size+0x304/0x450 fs/ext4/mballoc.c:856
Modules linked in:
CPU: 1 UID: 0 PID: 5969 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:mb_avg_fragment_size_order fs/ext4/mballoc.c:839 [inline]
RIP: 0010:mb_update_avg_fragment_size+0x304/0x450 fs/ext4/mballoc.c:856
Code: 5d 41 5e 41 5f 5d e9 1b 6a cd 08 e8 96 57 44 ff 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 7d 57 44 ff 90 <0f> 0b 90 48 bb 00 00 00 00 00 fc ff df 41 0f b6 44 1d 00 84 c0 0f
RSP: 0018:ffffc90003a56f48 EFLAGS: 00010293
RAX: ffffffff827bac43 RBX: 000000000000000d RCX: ffff8881037ad700
RDX: 0000000000000000 RSI: 000000000000000c RDI: 000000000000001e
RBP: 000000000000001e R08: ffff8881a9014007 R09: 1ffff11035202800
R10: dffffc0000000000 R11: ffffed1035202801 R12: ffff88810b77e014
R13: 1ffff110216efc02 R14: 000000000000001f R15: 000000000000000c
FS:  000055557ed08500(0000) GS:ffff8882a9f3b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c75c3f000 CR3: 0000000112a5a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 mb_mark_used+0xfd8/0x12f0 fs/ext4/mballoc.c:2195
 ext4_mb_use_best_found+0x192/0x7e0 fs/ext4/mballoc.c:2216
 ext4_mb_check_limits fs/ext4/mballoc.c:2280 [inline]
 ext4_mb_complex_scan_group+0xd27/0xf30 fs/ext4/mballoc.c:2596
 __ext4_mb_scan_group fs/ext4/mballoc.c:2664 [inline]
 ext4_mb_scan_group+0x116e/0x18e0 fs/ext4/mballoc.c:2955
 ext4_mb_scan_groups_linear+0xe8/0x360 fs/ext4/mballoc.c:1146
 ext4_mb_scan_groups fs/ext4/mballoc.c:1180 [inline]
 ext4_mb_regular_allocator+0x90e/0x2970 fs/ext4/mballoc.c:3026
 ext4_mb_new_blocks+0xd11/0x4720 fs/ext4/mballoc.c:6320
 ext4_ext_map_blocks+0x161a/0x6ac0 fs/ext4/extents.c:4383
 ext4_map_create_blocks fs/ext4/inode.c:609 [inline]
 ext4_map_blocks+0x860/0x1740 fs/ext4/inode.c:811
 ext4_convert_inline_data_nolock+0x249/0x970 fs/ext4/inline.c:1112
 ext4_convert_inline_data+0x4b3/0x5e0 fs/ext4/inline.c:1976
 ext4_fallocate+0x1e2/0x3d0 fs/ext4/extents.c:4793
 vfs_fallocate+0x669/0x7e0 fs/open.c:342
 ksys_fallocate fs/open.c:366 [inline]
 __do_sys_fallocate fs/open.c:371 [inline]
 __se_sys_fallocate fs/open.c:369 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:369
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9c7eb8f749
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:00007ffd1029f7c8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f9c7ede5fa0 RCX: 00007f9c7eb8f749
RDX: 0000000000004003 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f9c7ec13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9c7ede5fa0 R14: 00007f9c7ede5fa0 R15: 0000000000000004
 </TASK>