INFO: task syz-executor.2:14209 blocked for more than 143 seconds. Not tainted 6.0.0-rc3-syzkaller-16800-g85413d1e802e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack: 0 pid:14209 ppid: 17930 flags:0x00000001 Call trace: __switch_to+0x180/0x28c arch/arm64/kernel/process.c:557 context_switch kernel/sched/core.c:5182 [inline] __schedule+0x414/0x570 kernel/sched/core.c:6494 schedule+0x64/0xa4 kernel/sched/core.c:6570 rwsem_down_read_slowpath+0x228/0x410 kernel/locking/rwsem.c:1087 __down_read_common+0x48/0x144 kernel/locking/rwsem.c:1252 __down_read kernel/locking/rwsem.c:1261 [inline] down_read+0x68/0x78 kernel/locking/rwsem.c:1501 get_super+0xa0/0x144 fs/super.c:794 fsync_bdev+0x20/0x80 block/bdev.c:215 blkdev_flushbuf block/ioctl.c:352 [inline] blkdev_common_ioctl+0x500/0x185c block/ioctl.c:477 blkdev_ioctl+0x210/0x764 block/ioctl.c:608 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xd0/0x140 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x154 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/10: #0: ffff80000d4a3568 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x450 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/11: #0: ffff80000d4a3bb8 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x450 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/26: #0: ffff80000d4a3440 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:279 5 locks held by kworker/u4:2/48: #0: ffff0000c0174938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x270/0x504 kernel/workqueue.c:2262 #1: ffff80000f6e3d80 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x29c/0x504 kernel/workqueue.c:2264 #2: ffff80000d858998 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x68/0x628 net/core/net_namespace.c:557 #3: ffff80000d85a928 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 #4: ffff80000d4a49f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline] #4: ffff80000d4a49f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x210/0x47c kernel/rcu/tree_exp.h:940 2 locks held by udevd/2561: 2 locks held by getty/2710: #0: ffff0000c6300898 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x28/0x58 drivers/tty/tty_ldisc.c:244 #1: ffff80000f67e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x19c/0x88c drivers/tty/n_tty.c:2177 2 locks held by kworker/u4:8/11157: 1 lock held by syz-executor.3/16982: 1 lock held by syz-executor.5/17305: 1 lock held by syz-executor.4/17636: 1 lock held by syz-executor.2/17875: 1 lock held by syz-executor.1/20026: 1 lock held by syz-executor.0/31005: 2 locks held by kworker/0:13/9336: #0: ffff0000c0010f38 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x270/0x504 kernel/workqueue.c:2262 #1: ffff80002b6dbd80 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x29c/0x504 kernel/workqueue.c:2264 1 lock held by syz-executor.2/14209: #0: ffff0000fff9b0e0 (&type->s_umount_key#83){++++}-{3:3}, at: get_super+0xa0/0x144 fs/super.c:794 1 lock held by syz-executor.5/18824: #0: ffff80000d85a928 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffff80000d85a928 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x458/0x82c net/core/rtnetlink.c:6087 1 lock held by syz-executor.3/18830: #0: ffff80000d85a928 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffff80000d85a928 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x458/0x82c net/core/rtnetlink.c:6087 1 lock held by syz-executor.4/18837: #0: ffff80000d85a928 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffff80000d85a928 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x458/0x82c net/core/rtnetlink.c:6087 =============================================