INFO: task syz-executor:3974 blocked for more than 143 seconds. Not tainted 5.15.162-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack: 0 pid: 3974 ppid: 1 flags:0x00000009 Call trace: __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xf10/0x1e48 kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 schedule_timeout+0xb8/0x344 kernel/time/timer.c:1890 do_wait_for_common+0x214/0x388 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x4c/0x64 kernel/sched/completion.c:138 kthread_stop+0x1a0/0x788 kernel/kthread.c:664 ext4_stop_mmpd+0x48/0xb4 fs/ext4/mmp.c:263 ext4_put_super+0xa04/0xed4 fs/ext4/super.c:1266 generic_shutdown_super+0x130/0x29c fs/super.c:475 kill_block_super+0x70/0xdc fs/super.c:1414 deactivate_locked_super+0xb8/0x13c fs/super.c:335 deactivate_super+0x108/0x128 fs/super.c:366 cleanup_mnt+0x3c0/0x474 fs/namespace.c:1143 __cleanup_mnt+0x20/0x30 fs/namespace.c:1150 task_work_run+0x130/0x1e4 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] do_notify_resume+0x262c/0x32b8 arch/arm64/kernel/signal.c:946 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:609 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 INFO: task syz-executor:3978 blocked for more than 143 seconds. Not tainted 5.15.162-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack: 0 pid: 3978 ppid: 1 flags:0x00000009 Call trace: __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xf10/0x1e48 kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 schedule_timeout+0xb8/0x344 kernel/time/timer.c:1890 do_wait_for_common+0x214/0x388 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x4c/0x64 kernel/sched/completion.c:138 kthread_stop+0x1a0/0x788 kernel/kthread.c:664 ext4_stop_mmpd+0x48/0xb4 fs/ext4/mmp.c:263 ext4_put_super+0xa04/0xed4 fs/ext4/super.c:1266 generic_shutdown_super+0x130/0x29c fs/super.c:475 kill_block_super+0x70/0xdc fs/super.c:1414 deactivate_locked_super+0xb8/0x13c fs/super.c:335 deactivate_super+0x108/0x128 fs/super.c:366 cleanup_mnt+0x3c0/0x474 fs/namespace.c:1143 __cleanup_mnt+0x20/0x30 fs/namespace.c:1150 task_work_run+0x130/0x1e4 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] do_notify_resume+0x262c/0x32b8 arch/arm64/kernel/signal.c:946 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:609 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 INFO: task kmmpd-loop1:4248 blocked for more than 143 seconds. Not tainted 5.15.162-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kmmpd-loop1 state:D stack: 0 pid: 4248 ppid: 2 flags:0x00000008 Call trace: __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xf10/0x1e48 kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 percpu_rwsem_wait+0x288/0x3cc kernel/locking/percpu-rwsem.c:160 __percpu_down_read+0x70/0x98 kernel/locking/percpu-rwsem.c:174 percpu_down_read include/linux/percpu-rwsem.h:65 [inline] __sb_start_write include/linux/fs.h:1811 [inline] sb_start_write include/linux/fs.h:1881 [inline] write_mmp_block+0x57c/0x894 fs/ext4/mmp.c:66 kmmpd+0x72c/0xa30 fs/ext4/mmp.c:248 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 INFO: task kmmpd-loop3:4302 blocked for more than 143 seconds. Not tainted 5.15.162-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kmmpd-loop3 state:D stack: 0 pid: 4302 ppid: 2 flags:0x00000008 Call trace: __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xf10/0x1e48 kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 percpu_rwsem_wait+0x288/0x3cc kernel/locking/percpu-rwsem.c:160 __percpu_down_read+0x70/0x98 kernel/locking/percpu-rwsem.c:174 percpu_down_read include/linux/percpu-rwsem.h:65 [inline] __sb_start_write include/linux/fs.h:1811 [inline] sb_start_write include/linux/fs.h:1881 [inline] write_mmp_block+0x57c/0x894 fs/ext4/mmp.c:66 kmmpd+0x72c/0xa30 fs/ext4/mmp.c:248 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff800014b214e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311 1 lock held by udevd/3590: 2 locks held by getty/3731: #0: ffff0000d2f89098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001a32e2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1204 drivers/tty/n_tty.c:2158 1 lock held by syz-executor/3970: #0: ffff0000c21ba0e0 (&type->s_umount_key#30){++++}-{3:3}, at: deactivate_super+0x100/0x128 fs/super.c:365 1 lock held by syz-executor/3974: #0: ffff0000e6a0a0e0 (&type->s_umount_key#30){++++}-{3:3}, at: deactivate_super+0x100/0x128 fs/super.c:365 1 lock held by syz-executor/3978: #0: ffff0000d6b800e0 (&type->s_umount_key#30){++++}-{3:3}, at: deactivate_super+0x100/0x128 fs/super.c:365 1 lock held by syz-executor/3982: #0: ffff0000e27c00e0 (&type->s_umount_key#30){++++}-{3:3}, at: deactivate_super+0x100/0x128 fs/super.c:365 3 locks held by kworker/0:12/4200: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff80001d1d7c00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 #2: ffff0000d5e8b240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x274/0x33c4 drivers/net/netdevsim/fib.c:1478 1 lock held by kmmpd-loop1/4248: #0: ffff0000e6a0a460 (sb_writers#3){++++}-{0:0}, at: kmmpd+0x72c/0xa30 fs/ext4/mmp.c:248 1 lock held by kmmpd-loop3/4302: #0: ffff0000d6b80460 (sb_writers#3){++++}-{0:0}, at: kmmpd+0x72c/0xa30 fs/ext4/mmp.c:248 1 lock held by kmmpd-loop0/4353: #0: ffff0000c21ba460 (sb_writers#3){++++}-{0:0}, at: kmmpd+0x72c/0xa30 fs/ext4/mmp.c:248 3 locks held by kworker/u4:14/4387: 1 lock held by kmmpd-loop4/4392: #0: ffff0000e27c0460 (sb_writers#3){++++}-{0:0}, at: kmmpd+0x72c/0xa30 fs/ext4/mmp.c:248 1 lock held by syz.3.127/4560: #0: ffff0000d6b800e0 (&type->s_umount_key#30){++++}-{3:3}, at: user_get_super+0x11c/0x240 fs/super.c:837 3 locks held by kworker/u4:21/5100: #0: ffff0000c038c138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff80001a0f7c00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 #2: ffff800016a3ba10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf4/0x9bc net/core/net_namespace.c:561 1 lock held by syz.1.411/5469: #0: ffff0000e6a0a0e0 (&type->s_umount_key#30){++++}-{3:3}, at: iterate_supers+0xb0/0x1dc fs/super.c:703 1 lock held by syz.1.660/6331: #0: ffff0000e6a0a0e0 (&type->s_umount_key#30){++++}-{3:3}, at: user_get_super+0x11c/0x240 fs/super.c:837 1 lock held by syz-executor/6988: #0: ffff800014b25ae8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #0: ffff800014b25ae8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x320/0x660 kernel/rcu/tree_exp.h:845 =============================================