INFO: task syz.2.501:6284 blocked for more than 144 seconds. Not tainted 5.15.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.501 state:D stack: 0 pid: 6284 ppid: 4031 flags:0x00000009 Call trace: __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xe00/0x1c0c kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6518 rwsem_down_read_slowpath+0x46c/0x8bc kernel/locking/rwsem.c:1055 __down_read_common kernel/locking/rwsem.c:1239 [inline] __down_read kernel/locking/rwsem.c:1252 [inline] down_read+0x100/0x390 kernel/locking/rwsem.c:1500 iterate_supers+0xa8/0x1d0 fs/super.c:716 ksys_sync+0x90/0x164 fs/sync.c:102 __arm64_sys_sync+0x14/0x24 fs/sync.c:113 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 INFO: task syz.0.526:6401 blocked for more than 145 seconds. Not tainted 5.15.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.526 state:D stack: 0 pid: 6401 ppid: 5341 flags:0x00000009 Call trace: __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xe00/0x1c0c kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6518 rwsem_down_read_slowpath+0x46c/0x8bc kernel/locking/rwsem.c:1055 __down_read_common kernel/locking/rwsem.c:1239 [inline] __down_read kernel/locking/rwsem.c:1252 [inline] down_read+0x100/0x390 kernel/locking/rwsem.c:1500 iterate_supers+0xa8/0x1d0 fs/super.c:716 ksys_sync+0x90/0x164 fs/sync.c:102 __arm64_sys_sync+0x14/0x24 fs/sync.c:113 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff8000143211e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311 4 locks held by udevd/3645: #0: ffff000105f55c30 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xa8/0xc00 fs/seq_file.c:182 #1: ffff0000e8fa1c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x58/0x390 fs/kernfs/file.c:112 #2: ffff0000ebc34e88 (kn->active#2){++++}-{0:0}, at: kernfs_seq_start+0x74/0x390 fs/kernfs/file.c:113 #3: ffff0000ca40c178 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #3: ffff0000ca40c178 (&dev->mutex){....}-{3:3}, at: uevent_show+0x170/0x334 drivers/base/core.c:2408 2 locks held by getty/3795: #0: ffff0000d3be5098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001b7802e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2f0/0xf6c drivers/tty/n_tty.c:2158 2 locks held by kworker/u4:16/4398: 1 lock held by syz-executor/4680: #0: ffff0000f3f500e0 (&type->s_umount_key#62){++++}-{3:3}, at: deactivate_super+0xf0/0x118 fs/super.c:365 5 locks held by kworker/u4:19/5099: #0: ffff0000c038c138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff800020007c00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff80001626c490 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x12c/0xa98 net/core/net_namespace.c:589 #3: ffff800016277d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 #4: ffff800014325ca8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #4: ffff800014325ca8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2f0/0x5e0 kernel/rcu/tree_exp.h:845 2 locks held by kworker/0:11/5212: #0: ffff0000c0021938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001f737c00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 1 lock held by syz.2.501/6284: #0: ffff0000f3f500e0 (&type->s_umount_key#62){++++}-{3:3}, at: iterate_supers+0xa8/0x1d0 fs/super.c:716 2 locks held by kworker/u4:26/6313: 1 lock held by syz.0.526/6401: #0: ffff0000f3f500e0 (&type->s_umount_key#62){++++}-{3:3}, at: iterate_supers+0xa8/0x1d0 fs/super.c:716 1 lock held by syz.3.561/6597: #0: ffff0000f3f500e0 (&type->s_umount_key#62){++++}-{3:3}, at: iterate_supers+0xa8/0x1d0 fs/super.c:716 1 lock held by syz-executor/7616: #0: ffff800016277d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffff800016277d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x98c/0xd04 net/core/rtnetlink.c:5647 6 locks held by syz-executor/7667: #0: ffff0000d5308460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x228/0xa2c fs/read_write.c:590 #1: ffff0000d679d088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c0/0x478 fs/kernfs/file.c:287 #2: ffff0000cc9030f0 (kn->active#236){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1dc/0x478 fs/kernfs/file.c:288 #3: ffff80001584ce68 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x128/0x59c drivers/net/netdevsim/bus.c:295 #4: ffff0000ca40c178 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #4: ffff0000ca40c178 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8c/0x3d4 drivers/base/dd.c:954 #5: ffff800016277d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 1 lock held by syz.5.761/7898: =============================================