INFO: task syz-executor:6547 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:6547 tgid:6547 ppid:6543 task_flags:0x400140 flags:0x00000010 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5325 [inline] __schedule+0x13b0/0x2864 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xb4/0x230 kernel/sched/core.c:7026 wb_wait_for_completion+0x150/0x280 fs/fs-writeback.c:216 __writeback_inodes_sb_nr+0x1b0/0x218 fs/fs-writeback.c:2787 writeback_inodes_sb_nr fs/fs-writeback.c:2804 [inline] writeback_inodes_sb+0x78/0x8c fs/fs-writeback.c:2819 sync_filesystem+0xa0/0x218 fs/sync.c:54 generic_shutdown_super+0x70/0x2b8 fs/super.c:621 kill_block_super+0x44/0x90 fs/super.c:1722 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1327 __cleanup_mnt+0x20/0x30 fs/namespace.c:1334 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xfc/0x178 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:747 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by kthreadd/2: 3 locks held by kworker/0:1/11: 3 locks held by kworker/u8:0/12: 3 locks held by kworker/u8:1/15: 2 locks held by kworker/1:0/24: 1 lock held by khungtaskd/32: #0: ffff80008f76b560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by kworker/u8:2/41: 6 locks held by kworker/u8:3/42: #0: ffff0000c1843148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff8000990c7be0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff80009284a4f0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x6dc net/core/net_namespace.c:669 #3: ffff0000f2d180e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline] #3: ffff0000f2d180e8 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline] #3: ffff0000f2d180e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0xe4/0x380 net/devlink/core.c:506 #4: ffff0000f2d19250 (&devlink->lock_key#2){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:276 [inline] #4: ffff0000f2d19250 (&devlink->lock_key#2){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline] #4: ffff0000f2d19250 (&devlink->lock_key#2){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0xf0/0x380 net/devlink/core.c:506 #5: ffff800092857328 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 2 locks held by pr/ttyAMA-1/43: 3 locks held by kworker/u8:4/234: 3 locks held by kworker/u8:5/724: 3 locks held by kworker/u8:6/2140: 5 locks held by kworker/1:2/2325: 2 locks held by kworker/R-bat_e/4309: 1 lock held by jbd2/nvme0n1p2-/6154: 1 lock held by klogd/6178: 1 lock held by udevd/6189: 3 locks held by dhcpcd/6244: 2 locks held by getty/6333: #0: ffff0000d2f550a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009bb2e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa4 drivers/tty/n_tty.c:2222 1 lock held by udevd/6541: #0: ffff0000c1464cb8 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:995 [inline] #0: ffff0000c1464cb8 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: blkdev_read_iter+0x2a0/0x3dc block/fops.c:858 1 lock held by syz-executor/6547: #0: ffff0000d62d20e0 (&type->s_umount_key#72){+.+.}-{4:4}, at: __super_lock fs/super.c:57 [inline] #0: ffff0000d62d20e0 (&type->s_umount_key#72){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline] #0: ffff0000d62d20e0 (&type->s_umount_key#72){+.+.}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:505 1 lock held by syz-executor/6553: #0: ffff800092bc3148 (uevent_sock_mutex){+.+.}-{4:4}, at: uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline] #0: ffff800092bc3148 (uevent_sock_mutex){+.+.}-{4:4}, at: kobject_uevent_net_broadcast+0x24c/0x548 lib/kobject_uevent.c:410 1 lock held by syz-executor/6554: 2 locks held by kworker/0:2/6557: #0: ffff0000c002a148 ((wq_completion)events_long){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff8000a1e97be0 ((work_completion)(&(&sbi->sync_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 3 locks held by syz-executor/6560: 2 locks held by kworker/1:4/6604: 2 locks held by kworker/1:5/6611: 3 locks held by kworker/u8:7/6643: 2 locks held by kworker/0:4/6660: 3 locks held by kworker/u8:8/6700: 3 locks held by kworker/u8:9/6701: #0: ffff0000c0032148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff8000a4197be0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff800092857328 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by syz-executor/6921: #0: ffff800092bc3148 (uevent_sock_mutex){+.+.}-{4:4}, at: uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline] #0: ffff800092bc3148 (uevent_sock_mutex){+.+.}-{4:4}, at: kobject_uevent_net_broadcast+0x24c/0x548 lib/kobject_uevent.c:410 3 locks held by kworker/u8:10/6924: 3 locks held by kworker/u8:11/6926: 3 locks held by kworker/u8:12/6927: =============================================