BUG: MAX_LOCKDEP_ENTRIES too low!
turning off the locking correctness validator.
CPU: 0 PID: 19701 Comm: syz-executor.4 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 alloc_list_entry kernel/locking/lockdep.c:1353 [inline]
 add_lock_to_list.constprop.0.cold+0x11/0x18 kernel/locking/lockdep.c:1374
 check_prev_add kernel/locking/lockdep.c:3007 [inline]
 check_prevs_add kernel/locking/lockdep.c:3060 [inline]
 validate_chain kernel/locking/lockdep.c:3675 [inline]
 __lock_acquire+0x2f37/0x54c0 kernel/locking/lockdep.c:4901
 lock_acquire kernel/locking/lockdep.c:5511 [inline]
 lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
 kernfs_drain fs/kernfs/dir.c:468 [inline]
 __kernfs_remove+0x866/0xa90 fs/kernfs/dir.c:1324
 kernfs_remove_by_name_ns+0x51/0xb0 fs/kernfs/dir.c:1517
 kernfs_remove_by_name include/linux/kernfs.h:593 [inline]
 sysfs_unmerge_group+0xe3/0x160 fs/sysfs/group.c:369
 rpm_sysfs_remove drivers/base/power/sysfs.c:826 [inline]
 dpm_sysfs_remove+0x79/0xb0 drivers/base/power/sysfs.c:835
 device_del+0x20c/0xd40 drivers/base/core.c:3398
 device_unregister+0x22/0xc0 drivers/base/core.c:3454
 bdi_unregister+0x3e0/0x590 mm/backing-dev.c:876
 del_gendisk+0x8a2/0xab0 block/genhd.c:719
 loop_remove drivers/block/loop.c:2190 [inline]
 loop_control_ioctl drivers/block/loop.c:2290 [inline]
 loop_control_ioctl+0x40d/0x4f0 drivers/block/loop.c:2250
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcf5b00f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00000000004bfbb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffc86b5d97f R14: 00007fcf5b00f300 R15: 0000000000022000