INFO: task udevd:4959 blocked for more than 143 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:0 pid:4959 tgid:4959 ppid:4347 task_flags:0x400140 flags:0x00000000 Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7326 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7383 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4ec/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 bdev_release+0x128/0x328 block/bdev.c:1131 blkdev_release+0x20/0x34 block/fops.c:680 __fput+0x338/0x74c fs/file_table.c:512 fput_close_sync+0x10c/0x278 fs/file_table.c:617 __do_sys_close fs/open.c:1511 [inline] __se_sys_close fs/open.c:1496 [inline] __arm64_sys_close+0x7c/0x10c fs/open.c:1496 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 INFO: task syz.0.309:6324 blocked for more than 143 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.309 state:D stack:0 pid:6324 tgid:6313 ppid:4711 task_flags:0x400040 flags:0x00800001 Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7326 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7383 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4ec/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 bdev_open+0xc4/0x880 block/bdev.c:948 blkdev_open+0x2d4/0x408 block/fops.c:672 do_dentry_open+0x5c4/0xfc0 fs/open.c:947 vfs_open+0x44/0x2dc fs/open.c:1052 do_open fs/namei.c:4700 [inline] path_openat+0x21fc/0x2a60 fs/namei.c:4859 do_file_open+0x1c8/0x2e8 fs/namei.c:4888 do_sys_openat2+0x114/0x1e8 fs/open.c:1368 do_sys_open+0xb0/0xe0 fs/open.c:1374 __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __arm64_sys_openat+0xa0/0xbc fs/open.c:1385 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffff800088cb6f20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffff800088cb6f20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #0: ffff800088cb6f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6775 1 lock held by pr/ttyAMA-1/41: 3 locks held by kworker/0:2/1499: #0: ffff0000c002b540 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff0000c002b540 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x734/0x10b8 kernel/workqueue.c:3405 #1: ffff800096837c40 ((work_completion)(&ub->partition_scan_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffff800096837c40 ((work_completion)(&ub->partition_scan_work)){+.+.}-{0:0}, at: process_scheduled_works+0x73c/0x10b8 kernel/workqueue.c:3405 #2: ffff0000c594e350 (&disk->open_mutex){+.+.}-{4:4}, at: ublk_partition_scan_work+0x68/0xf4 drivers/block/ublk_drv.c:2458 2 locks held by getty/4495: #0: ffff0000cd7ec0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009248b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x348/0xf78 drivers/tty/n_tty.c:2211 1 lock held by udevd/4959: #0: ffff0000c594e350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x128/0x328 block/bdev.c:1131 2 locks held by kworker/u8:20/5337: #0: ffff0000c004c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff0000c004c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x734/0x10b8 kernel/workqueue.c:3405 #1: ffff80009b4f7c40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffff80009b4f7c40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x73c/0x10b8 kernel/workqueue.c:3405 1 lock held by syz.0.309/6324: #0: ffff0000c594e350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:948 4 locks held by kworker/u8:42/8885: 1 lock held by syz.5.1456/11364: #0: ffff0000dbbb8e78 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline] #0: ffff0000dbbb8e78 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1a8/0x46c mm/util.c:579 2 locks held by syz.5.1456/11365: 4 locks held by syz.2.1457/11370: 1 lock held by syz.2.1457/11371: #0: ffff0000d47e1c50 (&net->xfrm.xfrm_cfg_mutex){+.+.}-{4:4}, at: pfkey_sendmsg+0x38c/0xdf8 net/key/af_key.c:3720 2 locks held by kworker/u8:20/11372: =============================================