BUG: sleeping function called from invalid context at kernel/workqueue.c:4487
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5058, name: udevd
preempt_count: 100, expected: 0
RCU nest depth: 0, expected: 0
2 locks held by udevd/5058:
 #0: ffff8881012d4a10 (&root->kernfs_iattr_rwsem){++++}-{4:4}, at: kernfs_iop_permission+0x7f/0x430
 #1: ffffc90000a08cc0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd4/0x5e0
Preemption disabled at:
[<ffffffff818891ab>] handle_softirqs+0xab/0x840
CPU: 1 UID: 0 PID: 5058 Comm: udevd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0xe8/0x150
 __might_resched+0x378/0x4d0
 __cancel_work_sync+0x6d/0x110
 mmc_free_host+0x19/0x30
 call_timer_fn+0x192/0x5e0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x225/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x221/0x350
Code: ff ff ff e8 e1 6e 2e 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 cb 89 ca 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d b8 65 b8
RSP: 0018:ffffc900034ff938 EFLAGS: 00000282
RAX: 60b266767dbd4200 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000004b4209ec RSI: ffffffff8e4b418f RDI: ffffffff8c4bdd80
RBP: ffffffff82747d7f R08: ffffffff82747d7f R09: 0000000000000000
R10: 0000000000000000 R11: ffff8881012d4a10 R12: 0000000000000001
R13: ffff8881012d4a10 R14: 0000000000000001 R15: 0000000000000246
 down_read+0x4a/0x330
 kernfs_iop_permission+0x7f/0x430
 inode_permission+0x3de/0x5f0
 link_path_walk+0xaa6/0x1910
 path_lookupat+0xe4/0x8c0
 filename_lookup+0x265/0x5d0
 do_readlinkat+0xe3/0x510
 __x64_sys_readlink+0x7f/0x90
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f96fd117d47
Code: 73 01 c3 48 8b 0d e1 90 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b1 90 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffdcb5cd758 EFLAGS: 00000246 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffdcb5cd768 RCX: 00007f96fd117d47
RDX: 0000000000000400 RSI: 00007ffdcb5cd768 RDI: 00007ffdcb5cdc48
RBP: 0000000000000400 R08: 000000000000fe81 R09: 00007f96fd1f1b30
R10: 0000000000000007 R11: 0000000000000246 R12: 00007ffdcb5cdc48
R13: 00007ffdcb5cdbb8 R14: 000055a229ac8910 R15: 0000000000000000
 </TASK>
ODEBUG: object ffffc90000a08a80 is NOT on stack ffffc900034f8000, but annotated.

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