audit: type=1804 audit(1588081114.301:205): pid=19781 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir161746229/syzkaller.vTisop/390/file0/file0" dev="loop0" ino=1134 res=1
------------[ cut here ]------------
kernel BUG at fs/buffer.c:553!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 19778 Comm: syz-executor.0 Not tainted 4.19.118-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+0x2f8/0x3c0 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 48 89 6b 58 4c 89 ef e8 c2 8d 6b 05 e9 00 fe ff ff e8 f8 34 b3 ff <0f> 0b 4c 89 ff e8 de 05 e9 ff e9 e5 fd ff ff e8 d4 05 e9 ff e9 6e
RSP: 0018:ffff888088bdfc20 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff888049c765e8 RCX: ffffc90005ad8000
RDX: 0000000000040000 RSI: ffffffff81b474a8 RDI: ffff88807faf8478
RBP: ffff88807faf8318 R08: 0000000000000000 R09: 0000000000000002
R10: ffffed1015cc4732 R11: ffff8880ae623993 R12: ffff88807fa219a0
R13: 0000000000000000 R14: ffffffff879c67a0 R15: ffff88804bd697c0
FS:  00007f9fe44f2700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa9e9b3f000 CR3: 0000000096ff8000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 fat_ent_write+0xb7/0x1a0 fs/fat/fatent.c:417
 fat_chain_add+0x48d/0x600 fs/fat/misc.c:128
 fat_add_cluster+0xc7/0xf0 fs/fat/inode.c:106
 fat_fallocate+0x26d/0x310 fs/fat/file.c:300
 vfs_fallocate+0x484/0x990 fs/open.c:308
 ksys_fallocate+0x51/0x90 fs/open.c:331
 __do_sys_fallocate fs/open.c:339 [inline]
 __se_sys_fallocate fs/open.c:337 [inline]
 __x64_sys_fallocate+0x93/0xf0 fs/open.c:337
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c829
Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f9fe44f1c78 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00000000004db640 RCX: 000000000045c829
RDX: 0000000000000000 RSI: 0000000100000001 RDI: 0000000000000006
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 000000002811ffff R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000000ae R14: 00000000004c33e0 R15: 00007f9fe44f26d4
Modules linked in:
---[ end trace fc1eeb38453c23b6 ]---
RIP: 0010:mark_buffer_dirty_inode fs/buffer.c:553 [inline]
RIP: 0010:mark_buffer_dirty_inode+0x2f8/0x3c0 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 48 89 6b 58 4c 89 ef e8 c2 8d 6b 05 e9 00 fe ff ff e8 f8 34 b3 ff <0f> 0b 4c 89 ff e8 de 05 e9 ff e9 e5 fd ff ff e8 d4 05 e9 ff e9 6e
FAT-fs (loop5): error, fat_free_clusters: deleting FAT entry beyond EOF
FAT-fs (loop2): error, fat_free_clusters: deleting FAT entry beyond EOF
FAT-fs (loop2): Filesystem has been set read-only
FAT-fs (loop5): Filesystem has been set read-only
RSP: 0018:ffff888088bdfc20 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff888049c765e8 RCX: ffffc90005ad8000
RDX: 0000000000040000 RSI: ffffffff81b474a8 RDI: ffff88807faf8478
RBP: ffff88807faf8318 R08: 0000000000000000 R09: 0000000000000002
R10: ffffed1015cc4732 R11: ffff8880ae623993 R12: ffff88807fa219a0
R13: 0000000000000000 R14: ffffffff879c67a0 R15: ffff88804bd697c0
FS:  00007f9fe44f2700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000096ff8000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400