INFO: task syz-executor.0:3692 blocked for more than 430 seconds. Tainted: G W 6.9.0-syzkaller-12124-g6d69b6c12fce #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:3692 tgid:3691 ppid:3215 flags:0x00000005 Call trace: __switch_to+0x1c8/0x2a0 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5408 [inline] __schedule+0xad4/0x2b18 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0xd0/0x304 kernel/sched/core.c:6837 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6894 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x4e8/0x840 kernel/locking/mutex.c:752 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:804 rtnl_lock net/core/rtnetlink.c:79 [inline] rtnetlink_rcv_msg+0x2a8/0x8bc net/core/rtnetlink.c:6592 netlink_rcv_skb+0x18c/0x330 net/netlink/af_netlink.c:2564 rtnetlink_rcv+0x18/0x24 net/core/rtnetlink.c:6613 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x3bc/0x660 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x654/0xa44 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xc8/0x168 net/socket.c:745 ____sys_sendmsg+0x550/0x6e0 net/socket.c:2585 ___sys_sendmsg+0x11c/0x19c net/socket.c:2639 __sys_sendmsg+0xe0/0x174 net/socket.c:2668 __do_sys_sendmsg net/socket.c:2677 [inline] __se_sys_sendmsg net/socket.c:2675 [inline] __arm64_sys_sendmsg+0x70/0xa0 net/socket.c:2675 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x6c/0x25c arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:133 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffff800086a2e100 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x44/0x2d4 kernel/locking/lockdep.c:6608 3 locks held by kworker/u8:7/794: #0: ffff0000141a4148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x6dc/0x18a0 kernel/workqueue.c:3206 #1: ffff80008ad07ce0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x704/0x18a0 kernel/workqueue.c:3206 #2: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x1c/0x28 net/core/rtnetlink.c:79 1 lock held by klogd/3004: 1 lock held by dhcpcd/3045: #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x2a8/0x8bc net/core/rtnetlink.c:6592 2 locks held by getty/3135: #0: ffff0000147360a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008988d2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x93c/0xe9c drivers/tty/n_tty.c:2201 2 locks held by sshd/3190: 1 lock held by syz-fuzzer/3193: 1 lock held by syz-fuzzer/3194: 1 lock held by syz-fuzzer/3208: 1 lock held by syz-executor.1/3690: 1 lock held by syz-executor.0/3692: #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x2a8/0x8bc net/core/rtnetlink.c:6592 1 lock held by syz-executor.1/3695: #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x2a8/0x8bc net/core/rtnetlink.c:6592 1 lock held by syz-executor.0/3696: #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x2a8/0x8bc net/core/rtnetlink.c:6592 1 lock held by syz-executor.1/3704: #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x2a8/0x8bc net/core/rtnetlink.c:6592 1 lock held by syz-executor.0/3705: #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800087cee128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x2a8/0x8bc net/core/rtnetlink.c:6592 =============================================