------------[ cut here ]------------
kernel BUG at fs/buffer.c:553!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 22509 Comm: syz-executor.0 Not tainted 4.19.91-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:mark_buffer_dirty_inode fs/buffer.c:553 [inline]
RIP: 0010:mark_buffer_dirty_inode+0x30f/0x410 fs/buffer.c:544
Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 4d 4c 89 63 58 4c 89 ef e8 5b 8d 91 05 e9 ee fd ff ff e8 81 9e b0 ff <0f> 0b 4c 89 ff e8 97 34 e8 ff e9 d3 fd ff ff e8 8d 34 e8 ff e9 5b
RSP: 0018:ffff8880a53e7810 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff888099786888 RCX: ffffc90005ea6000
RDX: 0000000000040000 RSI: ffffffff81baa5bf RDI: ffff88809347f9a8
RBP: ffff8880a53e7850 R08: ffff888048698180 R09: 0000000000000003
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffff88809347f848
R13: 0000000000000000 R14: ffff888093565958 R15: ffff8880a53e7af8
FS:  00007f7432684700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 0000000093ab7000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 fat16_ent_put+0xd2/0x110 fs/fat/fatent.c:182
 fat_alloc_clusters+0x628/0xf20 fs/fat/fatent.c:503
 fat_add_cluster+0x6f/0x100 fs/fat/inode.c:101
 fat_fallocate+0x28a/0x330 fs/fat/file.c:300
 vfs_fallocate+0x4aa/0x9d0 fs/open.c:308
 ioctl_preallocate+0x197/0x210 fs/ioctl.c:482
 file_ioctl fs/ioctl.c:498 [inline]
 do_vfs_ioctl+0x1170/0x1380 fs/ioctl.c:688
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a919
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7432683c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919
RDX: 0000000020000000 RSI: 0000000040305828 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f74326846d4
R13: 00000000004c34d0 R14: 00000000004d8928 R15: 00000000ffffffff
Modules linked in:
kobject: 'loop0' (000000004c6a5ab6): kobject_uevent_env
---[ end trace 2b518970b9af1c4a ]---
kobject: 'loop0' (000000004c6a5ab6): fill_kobj_path: path = '/devices/virtual/block/loop0'
RIP: 0010:mark_buffer_dirty_inode fs/buffer.c:553 [inline]
RIP: 0010:mark_buffer_dirty_inode+0x30f/0x410 fs/buffer.c:544
loop_reread_partitions: partition scan of loop0 (�8�b�+�?���s�=7]c) failed (rc=-16)
Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 4d 4c 89 63 58 4c 89 ef e8 5b 8d 91 05 e9 ee fd ff ff e8 81 9e b0 ff <0f> 0b 4c 89 ff e8 97 34 e8 ff e9 d3 fd ff ff e8 8d 34 e8 ff e9 5b
RSP: 0018:ffff8880a53e7810 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff888099786888 RCX: ffffc90005ea6000
RDX: 0000000000040000 RSI: ffffffff81baa5bf RDI: ffff88809347f9a8
kobject: 'loop2' (0000000092736439): kobject_uevent_env
RBP: ffff8880a53e7850 R08: ffff888048698180 R09: 0000000000000003
kobject: 'loop2' (0000000092736439): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (000000006655d469): kobject_uevent_env
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffff88809347f848
kobject: 'loop4' (000000006655d469): fill_kobj_path: path = '/devices/virtual/block/loop4'
R13: 0000000000000000 R14: ffff888093565958 R15: ffff8880a53e7af8
FS:  00007f7432684700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop3' (00000000285039db): kobject_uevent_env
kobject: 'loop3' (00000000285039db): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (0000000092736439): kobject_uevent_env
CR2: 0000000000714158 CR3: 0000000093ab7000 CR4: 00000000001406f0
kobject: 'loop5' (00000000f0609a34): kobject_uevent_env
kobject: 'loop2' (0000000092736439): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop5' (00000000f0609a34): fill_kobj_path: path = '/devices/virtual/block/loop5'
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kobject: 'loop1' (0000000049ed4887): kobject_uevent_env
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
kobject: 'loop1' (0000000049ed4887): fill_kobj_path: path = '/devices/virtual/block/loop1'