random: crng init done INFO: task blkid:3373 blocked for more than 120 seconds. Not tainted 4.9.66-gb763480 #103 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D28208 3373 1866 0x00000004 ffff8801cefb8000 0000000000000000 ffff8801cd990540 ffff8801da29b000 ffff8801db321418 ffff8801ca087708 ffffffff838981cb 0000000000000000 0000000000000007 00ff8801cefb8000 ffff8801db321ce8 ffff8801db321d10 Call Trace: [] schedule+0x7f/0x1b0 kernel/sched/core.c:3550 [] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3583 [] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [] mutex_lock_nested+0x312/0x870 kernel/locking/mutex.c:621 [] __blkdev_get+0x10c/0xd50 fs/block_dev.c:1268 [] blkdev_get+0x33b/0x960 fs/block_dev.c:1416 [] blkdev_open+0x1a5/0x250 fs/block_dev.c:1571 [] do_dentry_open+0x607/0xc60 fs/open.c:766 [] vfs_open+0x105/0x220 fs/open.c:879 [] do_last fs/namei.c:3408 [inline] [] path_openat+0x5ac/0x2910 fs/namei.c:3531 [] do_filp_open+0x197/0x290 fs/namei.c:3566 [] do_sys_open+0x352/0x4c0 fs/open.c:1072 [] SYSC_open fs/open.c:1090 [inline] [] SyS_open+0x2d/0x40 fs/open.c:1085 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Showing all locks held in the system: 2 locks held by khungtaskd/514: #0: (rcu_read_lock){......}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [] watchdog+0x125/0xa70 kernel/hung_task.c:239 #1: (tasklist_lock){.+.+..}, at: [] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/3150: #0: (&f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0x9f/0xc0 fs/file.c:781 2 locks held by getty/3238: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133 1 lock held by syzkaller946102/3370: #0: (&bdev->bd_mutex){+.+.+.}, at: [] __blkdev_put+0xbc/0x7e0 fs/block_dev.c:1579 1 lock held by blkid/3373: #0: (&bdev->bd_mutex){+.+.+.}, at: [] __blkdev_get+0x10c/0xd50 fs/block_dev.c:1268 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 514 Comm: khungtaskd Not tainted 4.9.66-gb763480 #103 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d99dfd00 ffffffff81d90749 0000000000000000 0000000000000000 0000000000000000 0000000000000001 ffffffff810ba170 ffff8801d99dfd38 ffffffff81d9b86d 0000000000000000 0000000000000000 ffff8801cefb8418 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99 [] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60 [] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6f0/0xa70 kernel/hung_task.c:239 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:437 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff838a8606