__dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_failslab+0xd6/0x130 mm/failslab.c:32
------------[ cut here ]------------
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3376 [inline]
 kmem_cache_alloc_trace+0x29a/0x3d0 mm/slab.c:3616
WARNING: CPU: 1 PID: 22767 at fs/super.c:1163 kill_block_super+0xbe/0xe0 fs/super.c:1163
Kernel panic - not syncing: panic_on_warn set ...

 kmalloc include/linux/slab.h:488 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 kobject_uevent_env+0x20c/0xf40 lib/kobject_uevent.c:397
 figure_loop_size+0x249/0x2e0 drivers/block/loop.c:242
 loop_set_status+0x6aa/0x12b0 drivers/block/loop.c:1152
 loop_set_status64+0x92/0xe0 drivers/block/loop.c:1311
 lo_ioctl+0x587/0x1cd0 drivers/block/loop.c:1441
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x540/0x1830 block/ioctl.c:594
 block_ioctl+0xd9/0x120 fs/block_dev.c:1893
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x466459
RSP: 002b:00007f4554a7d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 0000000020000040 RSI: 0000000000004c04 RDI: 0000000000000003
RBP: 00007f4554a7d1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffcf60ab4cf R14: 00007f4554a7d300 R15: 0000000000022000
CPU: 1 PID: 22767 Comm: syz-executor.3 Not tainted 4.14.231-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:kill_block_super+0xbe/0xe0 fs/super.c:1163
RSP: 0018:ffff88809437fbb0 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90007cda000
RDX: 0000000000040000 RSI: ffffffff818726fe RDI: ffff8880b1f86c30
RBP: ffff8880778b8dc0 R08: ffffffff8b998e78 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8880a1406480 R12: ffff8880b1f86780
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: 0033:0x46797a
RSP: 002b:00007f0136d9ffa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000480 RCX: 000000000046797a
RDX: 0000000020000140 RSI: 0000000020000180 RDI: 00007f0136da0000
RBP: 00007f0136da0040 R08: 00007f0136da0040 R09: 0000000020000140
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000140
R13: 0000000020000180 R14: 00007f0136da0000 R15: 00000000200004c0
Kernel Offset: disabled
Rebooting in 86400 seconds..