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------------[ cut here ]------------
kernel BUG at fs/buffer.c:605!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 11238 Comm: syz-executor.0 Not tainted 4.14.134 #30
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888031c60200 task.stack: ffff888030008000
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:ffff88803000f3e8 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff888095a8c7e0 RCX: ffffc90006a43000
RDX: 0000000000040000 RSI: ffffffff819921ea RDI: ffff88809408a9b8
RBP: ffff88803000f420 R08: ffff888031c60200 R09: 0000000000000004
R10: 0000000000000000 R11: ffff888031c60200 R12: ffff88809408a858
R13: 0000000000000000 R14: ffff8880890a4a20 R15: ffff88803000f6a8
FS:  00007ff17f88f700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 000000008683c000 CR4: 00000000001426f0
Call Trace:
 fat12_ent_put+0x176/0x370 fs/fat/fatent.c:170
 fat_alloc_clusters+0x5a4/0xdb0 fs/fat/fatent.c:499
 fat_add_cluster+0x60/0xc0 fs/fat/inode.c:100
 __fat_get_block fs/fat/inode.c:147 [inline]
 fat_get_block+0x2d4/0x7e0 fs/fat/inode.c:176
 __block_write_begin_int+0x396/0x1100 fs/buffer.c:2027
 __block_write_begin fs/buffer.c:2077 [inline]
 block_write_begin+0x5f/0x190 fs/buffer.c:2136
 cont_write_begin+0x430/0x770 fs/buffer.c:2486
 fat_write_begin+0x8d/0x120 fs/fat/inode.c:222
 generic_perform_write+0x1f8/0x480 mm/filemap.c:3024
 __generic_file_write_iter+0x239/0x5b0 mm/filemap.c:3149
 generic_file_write_iter+0x303/0x660 mm/filemap.c:3177
 call_write_iter include/linux/fs.h:1777 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x4a7/0x6b0 fs/read_write.c:482
 vfs_write+0x198/0x500 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xfd/0x230 fs/read_write.c:582
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459829
RSP: 002b:00007ff17f88ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 000000000076656f RSI: 00000000200009c0 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff17f88f6d4
R13: 00000000004c9903 R14: 00000000004e0e80 R15: 00000000ffffffff
Code: fa 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 90 3c 82 04 e9 13 fe ff ff e8 16 85 c3 ff <0f> 0b 4c 89 ff e8 dc 26 ed ff e9 f8 fd ff ff e8 d2 26 ed ff e9 
RIP: mark_buffer_dirty_inode fs/buffer.c:605 [inline] RSP: ffff88803000f3e8
RIP: mark_buffer_dirty_inode+0x2ea/0x3e0 fs/buffer.c:596 RSP: ffff88803000f3e8
---[ end trace 7e9e8dd51c234318 ]---