INFO: task syz-executor:7089 blocked for more than 143 seconds. Not tainted 6.13.0-rc2-syzkaller-g2e7aff49b5da #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:7089 tgid:7089 ppid:1 flags:0x00000001 Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1744/0x27f0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6848 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6905 __mutex_lock_common+0xeec/0x28f4 kernel/locking/mutex.c:665 __mutex_lock kernel/locking/mutex.c:735 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:787 del_device_store+0xec/0x39c drivers/net/netdevsim/bus.c:216 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0x200/0x280 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x334/0x48c fs/kernfs/file.c:334 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x920/0xcf4 fs/read_write.c:679 ksys_write+0x15c/0x26c fs/read_write.c:731 __do_sys_write fs/read_write.c:742 [inline] __se_sys_write fs/read_write.c:739 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:739 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Showing all locks held in the system: 4 locks held by ksoftirqd/1/24: 1 lock held by khungtaskd/31: #0: ffff80008fb62560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336 2 locks held by kworker/u8:2/34: 3 locks held by kworker/u8:3/44: #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3203 #1: ffff8000990b7c20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3203 #2: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 3 locks held by kworker/u8:6/2105: #0: ffff0000c0031948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3203 #1: ffff8000a0407c20 ((crda_timeout).work){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3203 #2: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 4 locks held by kworker/u8:8/3624: #0: ffff0000c1899948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3203 #1: ffff8000a3527c20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3203 #2: ffff800092885910 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x13c/0x9b4 net/core/net_namespace.c:586 #3: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 1 lock held by dhcpcd/6086: #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline] #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xa20/0x1914 net/core/rtnetlink.c:4008 2 locks held by getty/6178: #0: ffff0000d30bd0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009b9db2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/6968: #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 #1: ffff80008f9feff0 (cpu_hotplug_lock){++++}-{0:0}, at: flush_all_backlogs net/core/dev.c:6031 [inline] #1: ffff80008f9feff0 (cpu_hotplug_lock){++++}-{0:0}, at: unregister_netdevice_many_notify+0x518/0x1c6c net/core/dev.c:11507 2 locks held by syz-executor/7031: #0: ffff800092885910 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x290/0x4ac net/core/net_namespace.c:496 #1: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 1 lock held by syz-executor/7059: #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 7 locks held by syz-executor/7061: #0: ffff0000d88ee420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline] #0: ffff0000d88ee420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x354/0xcf4 fs/read_write.c:675 #1: ffff0000ec365088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:325 #2: ffff0000c555f698 (kn->active#45){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:326 #3: ffff8000919fc2c8 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: new_device_store+0x170/0x704 drivers/net/netdevsim/bus.c:166 #4: ffff0000edf720e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1014 [inline] #4: ffff0000edf720e8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x90/0x434 drivers/base/dd.c:1005 #5: ffff0000edf70250 (&devlink->lock_key#7){+.+.}-{4:4}, at: devl_lock+0x24/0x34 net/devlink/core.c:276 #6: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 1 lock held by syz-executor/7082: #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 4 locks held by syz-executor/7089: #0: ffff0000d88ee420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline] #0: ffff0000d88ee420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x354/0xcf4 fs/read_write.c:675 #1: ffff0000f4770088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:325 #2: ffff0000c555f788 (kn->active#44){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:326 #3: ffff8000919fc2c8 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xec/0x39c drivers/net/netdevsim/bus.c:216 1 lock held by syz-executor/7133: #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline] #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xa20/0x1914 net/core/rtnetlink.c:4008 4 locks held by syz-executor/7141: #0: ffff800092885910 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x290/0x4ac net/core/net_namespace.c:496 #1: ffff8000920601d0 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x1a4/0x280 drivers/infiniband/core/device.c:1186 #2: ffff800092060390 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x1f4/0x280 drivers/infiniband/core/device.c:1191 #3: ffff0000da290f50 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x124/0x5b8 drivers/infiniband/core/device.c:950 1 lock held by syz-executor/7142: #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline] #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xa20/0x1914 net/core/rtnetlink.c:4008 5 locks held by syz-executor/7155: #0: ffff800092885910 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x290/0x4ac net/core/net_namespace.c:496 #1: ffff8000920601d0 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x1a4/0x280 drivers/infiniband/core/device.c:1186 #2: ffff800092060390 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x1f4/0x280 drivers/infiniband/core/device.c:1191 #3: ffff0000da290f50 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x124/0x5b8 drivers/infiniband/core/device.c:950 #4: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 1 lock held by syz-executor/7158: #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline] #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xa20/0x1914 net/core/rtnetlink.c:4008 =============================================