INFO: task syz-executor.0:15180 blocked for more than 143 seconds. Not tainted 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:15180 ppid:6107 flags:0x00000005 Call trace: __switch_to+0x314/0x560 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1364/0x23b4 kernel/sched/core.c:6695 schedule+0xc4/0x170 kernel/sched/core.c:6771 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 misc_open+0x6c/0x368 drivers/char/misc.c:129 chrdev_open+0x3e8/0x4fc fs/char_dev.c:414 do_dentry_open+0x6fc/0x118c fs/open.c:929 vfs_open+0x7c/0x90 fs/open.c:1063 do_open fs/namei.c:3640 [inline] path_openat+0x1f2c/0x27f8 fs/namei.c:3797 do_filp_open+0x1bc/0x3cc fs/namei.c:3824 do_sys_openat2+0x124/0x1b8 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1448 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 INFO: task syz-executor.3:15174 blocked for more than 143 seconds. Not tainted 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:0 pid:15174 ppid:6122 flags:0x0000000d Call trace: __switch_to+0x314/0x560 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1364/0x23b4 kernel/sched/core.c:6695 schedule+0xc4/0x170 kernel/sched/core.c:6771 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2143 do_wait_for_common+0x30c/0x468 kernel/sched/completion.c:95 __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:148 kthread_flush_worker+0x214/0x2d4 kernel/kthread.c:1374 alloc_and_link_pwqs kernel/workqueue.c:4607 [inline] alloc_workqueue+0xa30/0xf70 kernel/workqueue.c:4724 nci_register_device+0x1ec/0x7c4 net/nfc/nci/core.c:1230 virtual_ncidev_open+0x13c/0x1bc drivers/nfc/virtual_ncidev.c:148 misc_open+0x2f0/0x368 drivers/char/misc.c:165 chrdev_open+0x3e8/0x4fc fs/char_dev.c:414 do_dentry_open+0x6fc/0x118c fs/open.c:929 vfs_open+0x7c/0x90 fs/open.c:1063 do_open fs/namei.c:3640 [inline] path_openat+0x1f2c/0x27f8 fs/namei.c:3797 do_filp_open+0x1bc/0x3cc fs/namei.c:3824 do_sys_openat2+0x124/0x1b8 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1448 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 INFO: task syz-executor.2:15182 blocked for more than 143 seconds. Not tainted 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:0 pid:15182 ppid:6117 flags:0x00000005 Call trace: __switch_to+0x314/0x560 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1364/0x23b4 kernel/sched/core.c:6695 schedule+0xc4/0x170 kernel/sched/core.c:6771 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 misc_open+0x6c/0x368 drivers/char/misc.c:129 chrdev_open+0x3e8/0x4fc fs/char_dev.c:414 do_dentry_open+0x6fc/0x118c fs/open.c:929 vfs_open+0x7c/0x90 fs/open.c:1063 do_open fs/namei.c:3640 [inline] path_openat+0x1f2c/0x27f8 fs/namei.c:3797 do_filp_open+0x1bc/0x3cc fs/namei.c:3824 do_sys_openat2+0x124/0x1b8 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1448 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 INFO: task syz-executor.1:15184 blocked for more than 143 seconds. Not tainted 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:0 pid:15184 ppid:6108 flags:0x00000005 Call trace: __switch_to+0x314/0x560 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1364/0x23b4 kernel/sched/core.c:6695 schedule+0xc4/0x170 kernel/sched/core.c:6771 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 misc_open+0x6c/0x368 drivers/char/misc.c:129 chrdev_open+0x3e8/0x4fc fs/char_dev.c:414 do_dentry_open+0x6fc/0x118c fs/open.c:929 vfs_open+0x7c/0x90 fs/open.c:1063 do_open fs/namei.c:3640 [inline] path_openat+0x1f2c/0x27f8 fs/namei.c:3797 do_filp_open+0x1bc/0x3cc fs/namei.c:3824 do_sys_openat2+0x124/0x1b8 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1448 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 INFO: task syz-executor.5:15187 blocked for more than 143 seconds. Not tainted 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:0 pid:15187 ppid:6110 flags:0x00000005 Call trace: __switch_to+0x314/0x560 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1364/0x23b4 kernel/sched/core.c:6695 schedule+0xc4/0x170 kernel/sched/core.c:6771 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 misc_open+0x6c/0x368 drivers/char/misc.c:129 chrdev_open+0x3e8/0x4fc fs/char_dev.c:414 do_dentry_open+0x6fc/0x118c fs/open.c:929 vfs_open+0x7c/0x90 fs/open.c:1063 do_open fs/namei.c:3640 [inline] path_openat+0x1f2c/0x27f8 fs/namei.c:3797 do_filp_open+0x1bc/0x3cc fs/namei.c:3824 do_sys_openat2+0x124/0x1b8 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1448 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffff80008e513840 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:302 2 locks held by getty/5852: #0: ffff0000d287d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800094c102f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1214 drivers/tty/n_tty.c:2206 1 lock held by syz-executor.0/15180: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.3/15174: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.2/15182: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.1/15184: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.5/15187: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.5/15225: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.3/15226: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.1/15227: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.2/15228: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.0/15229: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.5/15239: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.2/15243: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.3/15244: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.1/15245: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 1 lock held by syz-executor.0/15246: #0: ffff80008f9ee9c8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:129 =============================================