INFO: task udevd:2856 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:23704 pid:2856 tgid:2856 ppid:1 task_flags:0x400140 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1138/0x47e0 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0xdd/0x390 kernel/sched/core.c:7283 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7340 rwsem_down_read_slowpath+0x5af/0xb40 kernel/locking/rwsem.c:1114 __down_read_common kernel/locking/rwsem.c:1291 [inline] __down_read kernel/locking/rwsem.c:1304 [inline] down_read+0xed/0x450 kernel/locking/rwsem.c:1570 kernfs_dop_revalidate+0xa5/0x7e0 fs/kernfs/dir.c:1218 d_revalidate fs/namei.c:1030 [inline] d_revalidate fs/namei.c:1026 [inline] lookup_fast+0x3c7/0x600 fs/namei.c:1876 walk_component fs/namei.c:2274 [inline] link_path_walk+0x7d4/0x1cc0 fs/namei.c:2652 path_lookupat+0x74/0xc40 fs/namei.c:2808 filename_lookup+0x202/0x590 fs/namei.c:2838 do_readlinkat+0xd3/0x370 fs/stat.c:571 __do_sys_readlink fs/stat.c:605 [inline] __se_sys_readlink fs/stat.c:602 [inline] __x64_sys_readlink+0x78/0xc0 fs/stat.c:602 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0x7f0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0e9c3723a7 RSP: 002b:00007ffdd1a24108 EFLAGS: 00000246 ORIG_RAX: 0000000000000059 RAX: ffffffffffffffda RBX: 00007ffdd1a245e0 RCX: 00007f0e9c3723a7 RDX: 0000000000000400 RSI: 00007ffdd1a24110 RDI: 00007ffdd1a245e0 RBP: 00007ffdd1a24110 R08: 0000000000000075 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000400 R13: 0000560c89d41100 R14: 0000000000000001 R15: 00007ffdd1a25ee0 Showing all locks held in the system: 5 locks held by ksoftirqd/1/22: 1 lock held by khungtaskd/29: #0: ffffffff896de960 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] ffffffff896de960 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] ffffffff896de960 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775