INFO: task syz.9.714:6840 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.9.714 state:D stack:0 pid:6840 tgid:6836 ppid:6416 task_flags:0x400140 flags:0x00000011 Call trace: __switch_to+0x208/0x4f0 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0xd1c/0x3278 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xd0/0x344 kernel/sched/core.c:6960 schedule_timeout+0x1ec/0x224 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common+0x1d0/0x3f8 kernel/sched/completion.c:121 wait_for_common kernel/sched/completion.c:132 [inline] wait_for_completion+0x20/0x2c kernel/sched/completion.c:153 disable_device+0x148/0x224 drivers/infiniband/core/device.c:1325 __ib_unregister_device+0x234/0x3b0 drivers/infiniband/core/device.c:1555 ib_unregister_device_and_put+0x50/0x78 drivers/infiniband/core/device.c:1620 nldev_dellink+0x1a0/0x278 drivers/infiniband/core/nldev.c:1827 rdma_nl_rcv_msg+0x274/0x56c drivers/infiniband/core/netlink.c:195 rdma_nl_rcv_skb.constprop.0.isra.0+0x1f0/0x328 drivers/infiniband/core/netlink.c:239 rdma_nl_rcv+0x10/0x1c drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x424/0x700 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x640/0xa50 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xc8/0x168 net/socket.c:742 ____sys_sendmsg+0x500/0x764 net/socket.c:2592 ___sys_sendmsg+0x11c/0x19c net/socket.c:2646 __sys_sendmsg+0x114/0x19c net/socket.c:2678 __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __arm64_sys_sendmsg+0x70/0xa0 net/socket.c:2681 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x2b0 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by khungtaskd/32: #0: ffff8000875425e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x18/0x1c4 kernel/locking/lockdep.c:6769 1 lock held by dhcpcd/3168: 2 locks held by getty/3263: #0: ffff0000198010a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008d8db2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e8/0xdd0 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/6247: 2 locks held by syz.9.714/6840: #0: ffff80008d73fcf8 (&rdma_nl_types[idx].sem){.+.+}-{4:4}, at: rdma_nl_rcv_msg+0x130/0x56c drivers/infiniband/core/netlink.c:164 #1: ffff000025c5c700 (&device->unregistration_lock){+.+.}-{4:4}, at: __ib_unregister_device+0x1d0/0x3b0 drivers/infiniband/core/device.c:1551 ============================================= INFO: task syz.9.714:6840 blocked for more than 450 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.9.714 state:D stack:0 pid:6840 tgid:6836 ppid:6416 task_flags:0x400140 flags:0x00000011 Call trace: __switch_to+0x208/0x4f0 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0xd1c/0x3278 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xd0/0x344 kernel/sched/core.c:6960 schedule_timeout+0x1ec/0x224 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common+0x1d0/0x3f8 kernel/sched/completion.c:121 wait_for_common kernel/sched/completion.c:132 [inline] wait_for_completion+0x20/0x2c kernel/sched/completion.c:153 disable_device+0x148/0x224 drivers/infiniband/core/device.c:1325 __ib_unregister_device+0x234/0x3b0 drivers/infiniband/core/device.c:1555 ib_unregister_device_and_put+0x50/0x78 drivers/infiniband/core/device.c:1620 nldev_dellink+0x1a0/0x278 drivers/infiniband/core/nldev.c:1827 rdma_nl_rcv_msg+0x274/0x56c drivers/infiniband/core/netlink.c:195 rdma_nl_rcv_skb.constprop.0.isra.0+0x1f0/0x328 drivers/infiniband/core/netlink.c:239 rdma_nl_rcv+0x10/0x1c drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x424/0x700 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x640/0xa50 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xc8/0x168 net/socket.c:742 ____sys_sendmsg+0x500/0x764 net/socket.c:2592 ___sys_sendmsg+0x11c/0x19c net/socket.c:2646 __sys_sendmsg+0x114/0x19c net/socket.c:2678 __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __arm64_sys_sendmsg+0x70/0xa0 net/socket.c:2681 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x2b0 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by khungtaskd/32: #0: ffff8000875425e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x18/0x1c4 kernel/locking/lockdep.c:6769 1 lock held by klogd/3127: 2 locks held by getty/3263: #0: ffff0000198010a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008d8db2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e8/0xdd0 drivers/tty/n_tty.c:2211 3 locks held by kworker/u8:1/4435: 4 locks held by kworker/u8:6/4454: #0: ffff00000e16b948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x6f8/0x18d4 kernel/workqueue.c:3232 #1: ffff8000a0687c90 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x71c/0x18d4 kernel/workqueue.c:3232 #2: ffff800088b823b0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xdc/0x75c net/core/net_namespace.c:670 #3: ffff000025c5c700 (&device->unregistration_lock){+.+.}-{4:4}, at: rdma_dev_change_netns+0x38/0x21c drivers/infiniband/core/device.c:1703 3 locks held by kworker/u8:21/5725: 2 locks held by syz.9.714/6840: #0: ffff80008d73fcf8 (&rdma_nl_types[idx].sem){.+.+}-{4:4}, at: rdma_nl_rcv_msg+0x130/0x56c drivers/infiniband/core/netlink.c:164 #1: ffff000025c5c700 (&device->unregistration_lock){+.+.}-{4:4}, at: __ib_unregister_device+0x1d0/0x3b0 drivers/infiniband/core/device.c:1551 1 lock held by dhcpcd-run-hook/7526: =============================================