FAT-fs (loop1): invalid media value (0xbf)
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FAT-fs (loop1): Can't find a valid FAT filesystem
WARNING: CPU: 0 PID: 10234 at fs/inode.c:342 inc_nlink+0x113/0x130 fs/inode.c:342
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 10234 Comm: syz-executor.3 Not tainted 4.14.232-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x44 kernel/panic.c:547
 report_bug+0x208/0x250 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:inc_nlink+0x113/0x130 fs/inode.c:342
netlink: 16 bytes leftover after parsing attributes in process `syz-executor.2'.
RSP: 0018:ffff888045c9fdf0 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff88803e253958 RCX: ffffc9000a5a2000
RDX: 0000000000000635 RSI: ffffffff818c67a3 RDI: ffff88803e253a30
netlink: 48 bytes leftover after parsing attributes in process `syz-executor.2'.
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88803e2539a0
R13: ffff88808ebd9300 R14: ffffffff87aa48c0 R15: 0000000000000000
 inode_inc_link_count include/linux/fs.h:2039 [inline]
 sysv_mkdir+0x21/0x120 fs/sysv/namei.c:136
audit: type=1804 audit(1620025383.279:17): pid=10239 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir950044219/syzkaller.6esQ12/21/file1/bus" dev="sda1" ino=13993 res=1
 vfs_mkdir+0x463/0x6e0 fs/namei.c:3849
 SYSC_mkdirat fs/namei.c:3872 [inline]
 SyS_mkdirat+0x1fd/0x270 fs/namei.c:3856
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4665f9
RSP: 002b:00007f005c702188 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 00000000004665f9
RDX: 0000000000000041 RSI: 00000000200001c0 RDI: 0000000000000005
RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffc864b886f R14: 00007f005c702300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..