INFO: task kworker/1:2:2889 blocked for more than 143 seconds. Not tainted 6.11.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:2 state:D stack:12608 pid:2889 tgid:2889 ppid:2 flags:0x00004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:5233 [inline] __schedule+0x67c/0xa40 kernel/sched/core.c:6573 __schedule_loop kernel/sched/core.c:6650 [inline] schedule+0xac/0x140 kernel/sched/core.c:6665 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6722 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x44a/0x970 kernel/locking/mutex.c:752 linkwatch_event+0xe/0x30 net/core/link_watch.c:276 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0x3a4/0x8f0 kernel/workqueue.c:3312 worker_thread+0x35a/0x4b0 kernel/workqueue.c:3390 kthread+0x114/0x140 kernel/kthread.c:389 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 INFO: task syz-executor:4151 blocked for more than 144 seconds. Not tainted 6.11.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:11744 pid:4151 tgid:4151 ppid:1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5233 [inline] __schedule+0x67c/0xa40 kernel/sched/core.c:6573 __schedule_loop kernel/sched/core.c:6650 [inline] schedule+0xac/0x140 kernel/sched/core.c:6665 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6722 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x44a/0x970 kernel/locking/mutex.c:752 rtnl_lock net/core/rtnetlink.c:79 [inline] rtnetlink_rcv_msg+0x49a/0x620 net/core/rtnetlink.c:6644 netlink_rcv_skb+0xe8/0x1c0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x47f/0x550 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x4e1/0x5c0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xca/0xf0 net/socket.c:745 __sys_sendto+0x344/0x3e0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0x28/0x30 net/socket.c:2212 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fea31d4fd73 RSP: 002b:00007fea3202f688 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fea32a34620 RCX: 00007fea31d4fd73 RDX: 000000000000006c RSI: 00007fea32a34670 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00007fea3202f6a4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 0000000000000000 R14: 00007fea32a34670 R15: 0000000000000000 INFO: task syz-executor:4156 blocked for more than 145 seconds. Not tainted 6.11.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:11600 pid:4156 tgid:4156 ppid:1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5233 [inline] __schedule+0x67c/0xa40 kernel/sched/core.c:6573 __schedule_loop kernel/sched/core.c:6650 [inline] schedule+0xac/0x140 kernel/sched/core.c:6665 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6722 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x44a/0x970 kernel/locking/mutex.c:752 rtnl_lock net/core/rtnetlink.c:79 [inline] rtnetlink_rcv_msg+0x49a/0x620 net/core/rtnetlink.c:6644 netlink_rcv_skb+0xe8/0x1c0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x47f/0x550 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x4e1/0x5c0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xca/0xf0 net/socket.c:745 __sys_sendto+0x344/0x3e0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0x28/0x30 net/socket.c:2212 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f73212efd73 RSP: 002b:00007f73215cf6e8 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f7321fd4620 RCX: 00007f73212efd73 RDX: 000000000000003c RSI: 00007f7321fd4670 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00007f73215cf704 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f7321fd4670 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by ksoftirqd/1/24: 1 lock held by khungtaskd/30: #0: ffffffff84bb1cf0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #0: ffffffff84bb1cf0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff84bb1cf0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x30/0x100 kernel/locking/lockdep.c:6620 3 locks held by kworker/u8:7/2339: #0: ffff8881026b9548 ((wq_completion)ipv6_addrconf){....}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff8881026b9548 ((wq_completion)ipv6_addrconf){....}-{0:0}, at: process_scheduled_works+0x2fd/0x8f0 kernel/workqueue.c:3312 #1: ffffc900071e3e48 ((work_completion)(&(&ifa->dad_work)->work)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc900071e3e48 ((work_completion)(&(&ifa->dad_work)->work)){....}-{0:0}, at: process_scheduled_works+0x324/0x8f0 kernel/workqueue.c:3312 #2: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: addrconf_dad_work+0x51/0x8b0 net/ipv6/addrconf.c:4194 4 locks held by kworker/u8:9/2752: #0: ffff888100a86d48 ((wq_completion)netns){....}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888100a86d48 ((wq_completion)netns){....}-{0:0}, at: process_scheduled_works+0x2fd/0x8f0 kernel/workqueue.c:3312 #1: ffffc90006453e48 (net_cleanup_work){....}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc90006453e48 (net_cleanup_work){....}-{0:0}, at: process_scheduled_works+0x324/0x8f0 kernel/workqueue.c:3312 #2: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: cleanup_net+0x59/0x5f0 net/core/net_namespace.c:594 #3: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: wg_destruct+0x1d/0x180 drivers/net/wireguard/device.c:246 3 locks held by kworker/1:2/2889: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x2fd/0x8f0 kernel/workqueue.c:3312 #1: ffffc90001a17e48 ((linkwatch_work).work){....}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc90001a17e48 ((linkwatch_work).work){....}-{0:0}, at: process_scheduled_works+0x324/0x8f0 kernel/workqueue.c:3312 #2: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: linkwatch_event+0xe/0x30 net/core/link_watch.c:276 1 lock held by dhcpcd/3105: #0: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: rtnetlink_rcv_msg+0x49a/0x620 net/core/rtnetlink.c:6644 2 locks held by getty/3178: #0: ffff888112a658a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x50 drivers/tty/tty_ldisc.c:243 #1: ffffc900081332f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x34e/0xf50 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:7/4102: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x2fd/0x8f0 kernel/workqueue.c:3312 #1: ffffc9000207fe48 (deferred_process_work){....}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc9000207fe48 (deferred_process_work){....}-{0:0}, at: process_scheduled_works+0x324/0x8f0 kernel/workqueue.c:3312 #2: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104 1 lock held by syz-executor/4151: #0: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: rtnetlink_rcv_msg+0x49a/0x620 net/core/rtnetlink.c:6644 2 locks held by syz-executor/4153: #0: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: tun_chr_close+0x1a/0xd0 drivers/net/tun.c:3510 #1: ffffffff84bb2b78 (rcu_state.exp_mutex){....}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:296 [inline] #1: ffffffff84bb2b78 (rcu_state.exp_mutex){....}-{3:3}, at: synchronize_rcu_expedited+0x2c2/0x5d0 kernel/rcu/tree_exp.h:958 1 lock held by syz-executor/4156: #0: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: rtnetlink_rcv_msg+0x49a/0x620 net/core/rtnetlink.c:6644 1 lock held by syz-executor/4158: #0: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: tun_chr_close+0x1a/0xd0 drivers/net/tun.c:3510 2 locks held by syz-executor/4343: #0: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/4349: #0: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/4351: #0: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/4353: #0: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/4430: #0: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/4434: #0: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/4438: #0: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/4443: #0: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/4513: #0: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: register_netdev+0x13/0x50 net/core/dev.c:10570 2 locks held by syz-executor/4516: #0: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: register_netdev+0x13/0x50 net/core/dev.c:10570 2 locks held by syz-executor/4521: #0: ffffffff84e26018 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: register_netdev+0x13/0x50 net/core/dev.c:10570 1 lock held by syz-executor/4524: #0: ffffffff84e28098 (rtnl_mutex){....}-{3:3}, at: __tun_chr_ioctl+0x2ab/0x1290 drivers/net/tun.c:3120 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x10e/0x1b0 lib/dump_stack.c:119 nmi_cpu_backtrace+0x234/0x250 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x102/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0x8d4/0x910 kernel/hung_task.c:379 kthread+0x114/0x140 kernel/kthread.c:389 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3765 Comm: syz-executor Not tainted 6.11.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:hash32_ptr include/linux/hash.h:96 [inline] RIP: 0010:arp_hashfn include/net/arp.h:16 [inline] RIP: 0010:___neigh_lookup_noref include/net/neighbour.h:306 [inline] RIP: 0010:__ipv4_neigh_lookup_noref include/net/arp.h:27 [inline] RIP: 0010:ip_neigh_gw4+0x46/0x110 include/net/route.h:379 Code: 24 08 e8 dd 79 12 fe 44 89 74 24 04 41 8b b7 b0 00 00 00 31 ed 83 e6 18 44 0f 45 f5 31 ff e8 01 7e 12 fe 48 8b 05 da 80 bb 01 <4c> 89 fa 48 c1 ea 20 44 31 fa 44 31 f2 0f af 50 0c 40 2a 68 08 89 RSP: 0018:ffffc900000e8840 EFLAGS: 00000246 RAX: ffff8881036ccd00 RBX: 0000000000000000 RCX: ffff8881148f8000 RDX: ffff8881148f8000 RSI: 0000000000000008 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff8329b9ef R09: ffffffff8329b3ec R10: 0000000000000002 R11: ffff8881148f8000 R12: ffff888124d9d300 R13: ffff888122e9d000 R14: 0000000000000000 R15: ffff888122e9d000 FS: 000055558c6b3500(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555638254a8 CR3: 0000000111794000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip_neigh_for_gw include/net/route.h:399 [inline] ip_finish_output2+0x73a/0x7a0 net/ipv4/ip_output.c:229 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0xbd/0x1b0 net/ipv4/ip_output.c:433 synproxy_send_client_synack+0x304/0x330 net/netfilter/nf_synproxy_core.c:484 nft_synproxy_eval_v4+0x1a8/0x1f0 net/netfilter/nft_synproxy.c:59 nft_synproxy_do_eval+0x170/0x3b0 net/netfilter/nft_synproxy.c:141 expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline] nft_do_chain+0x27e/0xb20 net/netfilter/nf_tables_core.c:288 nft_do_chain_inet+0x144/0x170 net/netfilter/nft_chain_filter.c:161 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0x52/0x160 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:269 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] ip_local_deliver+0x154/0x1a0 net/ipv4/ip_input.c:254 NF_HOOK include/linux/netfilter.h:314 [inline] ip_rcv+0x59/0x160 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core net/core/dev.c:5660 [inline] __netif_receive_skb+0xe4/0x210 net/core/dev.c:5774 process_backlog+0x257/0x5a0 net/core/dev.c:6107 __napi_poll+0x44/0x330 net/core/dev.c:6771 napi_poll net/core/dev.c:6840 [inline] net_rx_action+0x2e0/0x5f0 net/core/dev.c:6962 handle_softirqs+0xfe/0x2f0 kernel/softirq.c:554 do_softirq+0x86/0xf0 kernel/softirq.c:455 __local_bh_enable_ip+0x69/0x70 kernel/softirq.c:382 lock_sock include/net/sock.h:1607 [inline] tcp_recvmsg+0x129/0x430 net/ipv4/tcp.c:2592 inet_recvmsg+0x91/0x240 net/ipv4/af_inet.c:885 sock_recvmsg_nosec net/socket.c:1046 [inline] sock_recvmsg+0xab/0xf0 net/socket.c:1068 sock_read_iter+0x179/0x1e0 net/socket.c:1138 new_sync_read fs/read_write.c:395 [inline] vfs_read+0x45d/0x5a0 fs/read_write.c:476 ksys_read+0xc6/0x180 fs/read_write.c:619 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff099c5c93d Code: a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b5 e8 78 48 00 00 0f 1f 84 00 00 00 00 00 80 3d 01 ec 18 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec RSP: 002b:00007ffda97679a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ffda9767ab0 RCX: 00007ff099c5c93d RDX: 0000000000000004 RSI: 00007ffda97679bc RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000020fe7e4c R09: 7fffffffffffffff R10: 00007ff09a9550b8 R11: 0000000000000246 R12: 00007ffda9767db0 R13: 0000000000000004 R14: 00007ffda97679bc R15: 00007ffda9767a50