should_failslab+0xd6/0x130 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3376 [inline]
 kmem_cache_alloc+0x28e/0x3c0 mm/slab.c:3550
------------[ cut here ]------------
 kmem_cache_zalloc include/linux/slab.h:651 [inline]
 alloc_buffer_head+0x20/0x110 fs/buffer.c:3429
 alloc_page_buffers+0xb3/0x1f0 fs/buffer.c:874
WARNING: CPU: 0 PID: 8064 at fs/super.c:1163 kill_block_super+0xbe/0xe0 fs/super.c:1163
 grow_dev_page fs/buffer.c:1025 [inline]
 grow_buffers fs/buffer.c:1077 [inline]
 __getblk_slow+0x2d6/0x7a0 fs/buffer.c:1104
Kernel panic - not syncing: panic_on_warn set ...

 __getblk_gfp fs/buffer.c:1383 [inline]
 __bread_gfp+0x206/0x2e0 fs/buffer.c:1428
 sb_bread include/linux/buffer_head.h:309 [inline]
 efs_fill_super+0x12d/0xac0 fs/efs/super.c:275
 mount_bdev+0x2b3/0x360 fs/super.c:1134
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0xe53/0x2a00 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4465ba
RSP: 002b:00007ffc74ef3078 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004465ba
RDX: 0000000020000140 RSI: 0000000020000180 RDI: 00007ffc74ef30c0
RBP: 0000000000000005 R08: 00007ffc74ef3100 R09: 00007ffc74ef30c0
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000001a622c0
R13: 00007ffc74ef3100 R14: 0000000000000001 R15: 0000000000000006
CPU: 0 PID: 8064 Comm: syz-executor175 Not tainted 4.14.231-syzkaller #0
efs: cannot read superblock
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
efs: cannot read superblock
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:kill_block_super+0xbe/0xe0 fs/super.c:1163
RSP: 0018:ffff8880959c7bb0 EFLAGS: 00010297
RAX: ffff8880b06ec1c0 RBX: 0000000000000000 RCX: 1ffff110160dd94e
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff8880b1fb5cb0
RBP: ffff888094cac080 R08: ffffffff8b9a72c0 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8880b06ec1c0 R12: ffff8880b1fb5800
R13: ffffffff891ba2d0 R14: ffffffff88f44f40 R15: dffffc0000000000
 efs_kill_sb+0x38/0x50 fs/efs/super.c:33
 deactivate_locked_super+0x6c/0xd0 fs/super.c:319
 sget_userns+0x9c4/0xc10 fs/super.c:537
 sget+0xd1/0x110 fs/super.c:572
 mount_bdev+0xcd/0x360 fs/super.c:1107
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0xe53/0x2a00 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4465ba
RSP: 002b:00007ffc74ef3078 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004465ba
RDX: 0000000020000140 RSI: 0000000020000180 RDI: 00007ffc74ef30c0
RBP: 0000000000000005 R08: 00007ffc74ef3100 R09: 00007ffc74ef30c0
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000001a622c0
R13: 00007ffc74ef3100 R14: 0000000000000001 R15: 0000000000000006
Kernel Offset: disabled
Rebooting in 86400 seconds..