EXT4-fs (loop4): VFS: Can't find ext4 filesystem
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8813 at net/mac80211/rx.c:4321 ieee80211_rx_napi+0x177a/0x1e40 net/mac80211/rx.c:4321
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8813 Comm: syz-executor.0 Not tainted 4.14.198-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x4b kernel/panic.c:547
 report_bug+0x208/0x249 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:ieee80211_rx_napi+0x177a/0x1e40 net/mac80211/rx.c:4321
RSP: 0018:ffff8880aeb07d28 EFLAGS: 00010206
RAX: ffff88804de7a540 RBX: 0000000000000000 RCX: 1ffff11015d60fb2
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff888051ac1ebc
RBP: ffff888051ac1380 R08: ffffffff8a0974e8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888051ac3220
R13: ffff8880a804c280 R14: ffff888051ac1f80 R15: ffff888051ac1960
 ieee80211_rx include/net/mac80211.h:4026 [inline]
 ieee80211_tasklet_handler+0x90/0xf0 net/mac80211/main.c:228
 tasklet_action+0x195/0x340 kernel/softirq.c:513
 __do_softirq+0x254/0xa1d kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x193/0x240 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
RIP: 0010:preempt_schedule_irq+0xa6/0x140 kernel/sched/core.c:3611
RSP: 0018:ffff88804dd36e20 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0fa2d23 RBX: dffffc0000000000 RCX: 1ffff11009bcf5cc
RDX: 0000000000000000 RSI: ffff88804de7ae40 RDI: ffff88804de7adc4
RBP: ffffed1009bcf4a8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88804de7a540
R13: ffffffff87d16918 R14: 0000000000000000 R15: 0000000000000000
 retint_kernel+0x1b/0x2d
RIP: 0010:__find_get_block+0x20d/0xc40 fs/buffer.c:1355
RSP: 0018:ffff88804dd36ef8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90006a5e000
RDX: 0000000000040000 RSI: ffffffff81993f16 RDI: ffff88804de7adc4
RBP: 0000000000028b60 R08: 0000000000000222 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88804c8ee5e8
R13: ffffffff87d16918 R14: 0000000000000400 R15: ffff88804c8ee5e8
 __getblk_gfp+0x28/0x70 fs/buffer.c:1379
 sb_getblk include/linux/buffer_head.h:333 [inline]
 __ext4_get_inode_loc+0x32b/0xf30 fs/ext4/inode.c:4520
 ext4_get_inode_loc fs/ext4/inode.c:4633 [inline]
 ext4_reserve_inode_write+0xd9/0x230 fs/ext4/inode.c:5793
 ext4_mark_inode_dirty+0x12f/0x7a0 fs/ext4/inode.c:5960
 ext4_dirty_inode+0x6c/0x90 fs/ext4/inode.c:5999
 __mark_inode_dirty+0x11e/0x1040 fs/fs-writeback.c:2153
 mark_inode_dirty include/linux/fs.h:2024 [inline]
 dquot_alloc_space include/linux/quotaops.h:315 [inline]
 dquot_alloc_block include/linux/quotaops.h:332 [inline]
 ext4_mb_new_blocks+0x4c6/0x3db0 fs/ext4/mballoc.c:4561
 ext4_alloc_branch fs/ext4/indirect.c:335 [inline]
 ext4_ind_map_blocks+0x116f/0x20e0 fs/ext4/indirect.c:619
 ext4_map_blocks+0xb3a/0x1730 fs/ext4/inode.c:650
 _ext4_get_block+0x187/0x480 fs/ext4/inode.c:801
 ext4_get_block_trans+0x143/0x220 fs/ext4/inode.c:862
 ext4_dio_get_block+0x6a/0xb0 fs/ext4/inode.c:879
 get_more_blocks fs/direct-io.c:718 [inline]
 do_direct_IO fs/direct-io.c:1003 [inline]
 do_blockdev_direct_IO fs/direct-io.c:1336 [inline]
 __blockdev_direct_IO+0x3f6d/0xdc60 fs/direct-io.c:1422
 ext4_direct_IO_write fs/ext4/inode.c:3716 [inline]
 ext4_direct_IO+0x888/0x1b80 fs/ext4/inode.c:3857
 generic_file_direct_write+0x1df/0x420 mm/filemap.c:2950
 __generic_file_write_iter+0x2a2/0x590 mm/filemap.c:3129
 ext4_file_write_iter+0x276/0xd20 fs/ext4/file.c:270
 call_write_iter include/linux/fs.h:1778 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x44c/0x630 fs/read_write.c:482
 vfs_write+0x17f/0x4d0 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xf2/0x210 fs/read_write.c:582
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45e179
RSP: 002b:00007fb7666efc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000039940 RCX: 000000000045e179
RDX: 0000000000248800 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007fffab0fd0af R14: 00007fb7666f09c0 R15: 000000000118cf4c
Kernel Offset: disabled
Rebooting in 86400 seconds..