INFO: task syz-executor:6475 blocked for more than 145 seconds. Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:6475 tgid:6475 ppid:6469 task_flags:0x400140 flags:0x00000008 Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5382 [inline] __schedule+0x16a4/0x2c80 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6860 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6917 __mutex_lock_common+0xda8/0x2604 kernel/locking/mutex.c:678 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 __lru_add_drain_all+0x88/0x50c mm/swap.c:830 lru_add_drain_all+0x18/0x24 mm/swap.c:883 invalidate_bdev+0x78/0xa4 block/bdev.c:101 ext4_put_super+0x69c/0xc6c fs/ext4/super.c:1343 generic_shutdown_super+0x12c/0x2bc fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1710 ext4_kill_sb+0x68/0xa4 fs/ext4/super.c:7393 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1435 __cleanup_mnt+0x20/0x30 fs/namespace.c:1442 task_work_run+0x230/0x2e0 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x178/0x1f4 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+0xac/0x168 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 INFO: task syz-executor:6475 is blocked on a mutex likely owned by task khugepaged:37. task:khugepaged state:R running task stack:0 pid:37 tgid:37 ppid:2 task_flags:0x200040 flags:0x00000008 Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5382 [inline] __schedule+0x16a4/0x2c80 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6860 schedule_timeout+0xb4/0x2ac kernel/time/sleep_timeout.c:75 do_wait_for_common+0x310/0x47c 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 __flush_work+0x798/0x958 kernel/workqueue.c:4244 flush_work+0x34/0x48 kernel/workqueue.c:4265 __lru_add_drain_all+0x4a4/0x50c mm/swap.c:875 lru_add_drain_all+0x18/0x24 mm/swap.c:883 khugepaged_do_scan mm/khugepaged.c:2535 [inline] khugepaged+0x188/0x16a0 mm/khugepaged.c:2604 kthread+0x674/0x7dc kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Showing all locks held in the system: 1 lock held by kthreadd/2: 2 locks held by kworker/0:0/9: 3 locks held by kworker/0:1/11: 3 locks held by kworker/u8:0/12: 3 locks held by kworker/u8:1/13: 1 lock held by kworker/R-mm_pe/14: #0: ffff80008ffc0308 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2736 [inline] #0: ffff80008ffc0308 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x714/0xfa0 kernel/workqueue.c:3529 4 locks held by kworker/1:0/24: 3 locks held by kworker/1:1/26: 1 lock held by khungtaskd/32: #0: ffff800090118020 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 1 lock held by khugepaged/37: 3 locks held by kworker/u8:2/44: 3 locks held by kworker/u8:3/45: 3 locks held by kworker/u8:4/63: 2 locks held by kworker/u8:5/125: #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3212 #1: ffff80009c177b80 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3212 3 locks held by kworker/u8:6/593: #0: ffff0000c0031948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3212 #1: ffff80009cc87b80 ((crda_timeout).work){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3212 #2: ffff800093071868 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 2 locks held by kworker/1:2/2289: