kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 11789 Comm: syz-executor0 Not tainted 4.9.111-g03c70fe #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801ba731800 task.stack: ffff8801a5a80000
RIP: 0010:[<ffffffff81236b8b>]  [<ffffffff81236b8b>] __lock_acquire+0xa1b/0x4070 kernel/locking/lockdep.c:3224
RSP: 0018:ffff8801a5a87530  EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000024 RSI: 0000000000000000 RDI: 0000000000000120
RBP: ffff8801a5a876d8 R08: 0000000000000001 R09: 0000000000000000
R10: ffff8801ba731800 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000120 R15: 0000000000000000
FS:  00007f796ee17700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb77ae00000 CR3: 00000001caec2000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d3d56600 ffff8801ba732168 000000000000052a 0000000000000004
 0000000000000000 ffff8801ba73218a ffff8801a5a87718 0000000000000046
 ffff8801a5a87728 ffff8801a5a875b8 ffffffff81f1a18b ffff8801a5a875c8
Call Trace:
 [<ffffffff8123ac50>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff839f8086>] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline]
 [<ffffffff839f8086>] _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151
 [<ffffffff81622243>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff81622243>] mark_buffer_dirty_inode+0x133/0x200 fs/buffer.c:609
 [<ffffffff818c4458>] fat12_ent_put+0x178/0x370 fs/fat/fatent.c:170
 [<ffffffff818c653c>] fat_alloc_clusters+0x5ac/0xe10 fs/fat/fatent.c:499
 [<ffffffff818b83ad>] fat_alloc_new_dir+0x10d/0xef0 fs/fat/dir.c:1144
 [<ffffffff818dd988>] vfat_mkdir+0xf8/0x3e0 fs/fat/namei_vfat.c:881
 [<ffffffff815997e9>] vfs_mkdir2+0x3c9/0x630 fs/namei.c:3820
 [<ffffffff815ac573>] SYSC_mkdirat fs/namei.c:3849 [inline]
 [<ffffffff815ac573>] SyS_mkdirat+0x213/0x260 fs/namei.c:3833
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f8cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 25 28 00 00 00 0f 85 17 27 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 51 27 00 00 49 81 3e a0 8c e9 84 0f 84 08 f7 
RIP  [<ffffffff81236b8b>] __lock_acquire+0xa1b/0x4070 kernel/locking/lockdep.c:3224
 RSP <ffff8801a5a87530>
---[ end trace 817deccdef18731f ]---