kernel BUG at fs/buffer.c:605!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 18087 Comm: syz-executor.3 Not tainted 4.14.137 #33
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Node 1 active_anon:0kB inactive_anon:0kB active_file:144kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:0kB dirty:4kB writeback:0kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
task: ffff88809b6da500 task.stack: ffff8880584d0000
Node 0 
RIP: 0010:mark_buffer_dirty_inode fs/buffer.c:605 [inline]
RIP: 0010:mark_buffer_dirty_inode+0x2ea/0x3e0 fs/buffer.c:596
RSP: 0018:ffff8880584d7678 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff888095bb5a80 RCX: ffffc9000a659000
RDX: 0000000000040000 RSI: ffffffff81995cda RDI: ffff88809a3979b8
RBP: ffff8880584d76b0 R08: ffff88809b6da500 R09: 0000000000000004
R10: 0000000000000000 R11: ffff88809b6da500 R12: ffff88809a397858
R13: 0000000000000000 R14: ffff888089561660 R15: 0000000000003955
FS:  00007f6f40a52700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
DMA free:15908kB min:216kB low:268kB high:320kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
CR2: 0000000000738008 CR3: 00000000831d0000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 fat16_ent_put+0xc5/0x100 fs/fat/fatent.c:181
 fat_free_clusters+0x369/0x810 fs/fat/fatent.c:593
lowmem_reserve[]:
 fat_free fs/fat/file.c:351 [inline]
 fat_truncate_blocks+0x693/0xae0 fs/fat/file.c:369
 fat_setattr+0x6c1/0xae0 fs/fat/file.c:513
 0
 2580
 notify_change+0x8d1/0xd10 fs/attr.c:313
 do_truncate+0x124/0x1c0 fs/open.c:63
 handle_truncate fs/namei.c:3009 [inline]
 do_last fs/namei.c:3434 [inline]
 path_openat+0x2786/0x3f70 fs/namei.c:3566
 2580
 do_filp_open+0x18e/0x250 fs/namei.c:3600
 2580
 do_sys_open+0x2c5/0x430 fs/open.c:1084
Node 0 
DMA32 free:511800kB min:36468kB low:45584kB high:54700kB active_anon:704416kB inactive_anon:2760kB active_file:51496kB inactive_file:46808kB unevictable:16400kB writepending:1048kB present:3129332kB managed:2644892kB mlocked:16400kB kernel_stack:9248kB pagetables:9744kB bounce:0kB free_pcp:612kB local_pcp:336kB free_cma:0kB
 SYSC_open fs/open.c:1102 [inline]
 SyS_open fs/open.c:1097 [inline]
 SYSC_creat fs/open.c:1142 [inline]
 SyS_creat+0x27/0x30 fs/open.c:1140
lowmem_reserve[]:
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 0
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459829
 0
RSP: 002b:00007f6f40a51c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459829
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6f40a526d4
R13: 00000000004bfe84 R14: 00000000004d1ca0 R15: 00000000ffffffff
Code: fa 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 
 0
4d 4c 89 63 58 4c 89 ef e8 70 8e 82 04 e9 13 fe ff ff e8 e6 78 c3 ff <0f> 0b 4c 89 ff e8 5c 25 ed ff e9 
 0
f8 fd ff ff e8 52 25 ed ff 
e9 
RIP: mark_buffer_dirty_inode fs/buffer.c:605 [inline] RSP: ffff8880584d7678
RIP: mark_buffer_dirty_inode+0x2ea/0x3e0 fs/buffer.c:596 RSP: ffff8880584d7678
---[ end trace 356102848f3966a2 ]---
kobject: 'loop1' (ffff8880a49f80e0): kobject_uevent_env