INFO: task udevd:8712 blocked for more than 430 seconds. Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:0 pid:8712 tgid:8712 ppid:3102 flags:0x00000005 Call trace: __switch_to+0x1c8/0x2a4 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5188 [inline] __schedule+0xacc/0x2920 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xd0/0x304 kernel/sched/core.c:6621 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6678 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x4e8/0x840 kernel/locking/mutex.c:752 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:804 bdev_open+0x2c4/0xa84 block/bdev.c:897 blkdev_open+0x24c/0x37c block/fops.c:630 do_dentry_open+0x50c/0x1068 fs/open.c:959 vfs_open+0x5c/0x2fc fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x16dc/0x2380 fs/namei.c:3886 do_filp_open+0x16c/0x330 fs/namei.c:3913 do_sys_openat2+0x12c/0x160 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __arm64_sys_openat+0x12c/0x1b8 fs/open.c:1442 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 INFO: task syz.1.2019:8721 blocked for more than 430 seconds. Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.2019 state:D stack:0 pid:8721 tgid:8721 ppid:5695 flags:0x00000001 Call trace: __switch_to+0x1c8/0x2a4 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5188 [inline] __schedule+0xacc/0x2920 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xd0/0x304 kernel/sched/core.c:6621 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6678 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x4e8/0x840 kernel/locking/mutex.c:752 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:804 bdev_release+0x104/0x510 block/bdev.c:1080 blkdev_release+0x14/0x24 block/fops.c:638 __fput+0x2c4/0x964 fs/file_table.c:422 ____fput+0x10/0x1c fs/file_table.c:450 task_work_run+0x128/0x210 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x1d4/0x25c arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0x100/0x180 arch/arm64/kernel/entry-common.c:713 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 INFO: task syz.1.2019:8722 blocked for more than 430 seconds. Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.2019 state:D stack:0 pid:8722 tgid:8721 ppid:5695 flags:0x00000009 Call trace: __switch_to+0x1c8/0x2a4 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5188 [inline] __schedule+0xacc/0x2920 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xd0/0x304 kernel/sched/core.c:6621 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6678 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x4e8/0x840 kernel/locking/mutex.c:752 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:804 bdev_release+0x104/0x510 block/bdev.c:1080 blkdev_release+0x14/0x24 block/fops.c:638 __fput+0x2c4/0x964 fs/file_table.c:422 ____fput+0x10/0x1c fs/file_table.c:450 task_work_run+0x128/0x210 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x1d4/0x25c arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0x100/0x180 arch/arm64/kernel/entry-common.c:713 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffff800086c62ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x44/0x2d4 kernel/locking/lockdep.c:6620 2 locks held by syslogd/3087: 2 locks held by getty/3219: #0: ffff000019b5e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008cc2b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x93c/0xe9c drivers/tty/n_tty.c:2211 1 lock held by syz-executor/3276: 1 lock held by udevd/8712: #0: ffff0000162b24c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0x2c4/0xa84 block/bdev.c:897 1 lock held by syz.1.2019/8721: #0: ffff0000162b24c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x104/0x510 block/bdev.c:1080 1 lock held by syz.1.2019/8722: #0: ffff0000162b24c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x104/0x510 block/bdev.c:1080 1 lock held by syz.1.2019/8723: #0: ffff0000162b24c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0x2c4/0xa84 block/bdev.c:897 1 lock held by syz.1.2661/10537: #0: ffff000014a8c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x9c/0x11c arch/arm64/kernel/stacktrace.c:317 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0xa4/0xf4 lib/dump_stack.c:119 dump_stack+0x1c/0x28 lib/dump_stack.c:128 nmi_cpu_backtrace+0x1b0/0x274 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x25c/0x300 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x18/0x24 arch/arm64/kernel/smp.c:926 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xa74/0xd40 kernel/hung_task.c:379 kthread+0x27c/0x300 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3087 Comm: syslogd Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 Hardware name: linux,dummy-virt (DT) pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __seqprop_raw_spinlock_sequence include/linux/seqlock.h:226 [inline] pc : ktime_get_coarse_real_ts64+0x98/0x198 kernel/time/timekeeping.c:2390 lr : seqcount_lockdep_reader_access include/linux/seqlock.h:74 [inline] lr : ktime_get_coarse_real_ts64+0x158/0x198 kernel/time/timekeeping.c:2390 sp : ffff8000a0bb79f0 x29: ffff8000a0bb79f0 x28: ffff800080a2f308 x27: dfff800000000000 x26: ffff8000a0bb7ac8 x25: 1ffff00014176f58 x24: ffff700014176f59 x23: ffff800080a2f308 x22: 0000000000000000 x21: ffff8000a0bb7ac0 x20: ffff800086c8e780 x19: ffff800086c8e788 x18: 00000000ad5cd792 x17: 0000000000000000 x16: 0000000000000000 x15: ffff0000195be480 x14: 1fffe000032b7c8f x13: 1fffe000032b7c9e x12: 0000000000000007 x11: 0000000000000000 x10: ffff800088352a40 x9 : ffff0000195be4c8 x8 : 00000000f3000000 x7 : 1fffe000032b7c99 x6 : 00000000f3f3f3f3 x5 : 00000000f2f2f200 x4 : ffff700014176f08 x3 : 0000000000000001 x2 : 0000000000000000 x1 : 0000000000000003 x0 : 00000000000000c0 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] seqcount_lockdep_reader_access include/linux/seqlock.h:74 [inline] ktime_get_coarse_real_ts64+0x98/0x198 kernel/time/timekeeping.c:2390 current_time fs/inode.c:2610 [inline] inode_needs_update_time+0x78/0x294 fs/inode.c:2178 file_update_time+0x38/0x124 fs/inode.c:2232 shmem_file_write_iter+0xcc/0x104 mm/shmem.c:3071 new_sync_write fs/read_write.c:497 [inline] vfs_write+0x4a8/0xacc fs/read_write.c:590 ksys_write+0xf0/0x1dc fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __arm64_sys_write+0x6c/0x9c fs/read_write.c:652 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598