INFO: task kworker/u8:6:2815 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/u8:6 state:D stack:11048 pid:2815 tgid:2815 ppid:2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:5259 [inline] __schedule+0x67c/0xa40 kernel/sched/core.c:6599 __schedule_loop kernel/sched/core.c:6676 [inline] schedule+0xac/0x140 kernel/sched/core.c:6691 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6748 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x44a/0x970 kernel/locking/mutex.c:752 addrconf_dad_work+0x51/0x8b0 net/ipv6/addrconf.c:4194 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 kworker/1:7:4276 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:kworker/1:7 state:D stack:13128 pid:4276 tgid:4276 ppid:2 flags:0x00004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:5259 [inline] __schedule+0x67c/0xa40 kernel/sched/core.c:6599 __schedule_loop kernel/sched/core.c:6676 [inline] schedule+0xac/0x140 kernel/sched/core.c:6691 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6748 __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:4384 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:11312 pid:4384 tgid:4384 ppid:1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5259 [inline] __schedule+0x67c/0xa40 kernel/sched/core.c:6599 __schedule_loop kernel/sched/core.c:6676 [inline] schedule+0xac/0x140 kernel/sched/core.c:6691 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6748 __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: 0033:0x7f0070affe33 RSP: 002b:00007f0070ddf6a8 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f00717e4620 RCX: 00007f0070affe33 RDX: 0000000000000028 RSI: 00007f00717e4670 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00007f0070ddf6c4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f00717e4670 R15: 0000000000000000 INFO: task syz-executor:4450 blocked for more than 146 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:11456 pid:4450 tgid:4450 ppid:1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5259 [inline] __schedule+0x67c/0xa40 kernel/sched/core.c:6599 __schedule_loop kernel/sched/core.c:6676 [inline] schedule+0xac/0x140 kernel/sched/core.c:6691 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6748 __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: 0033:0x7febb304fe33 RSP: 002b:00007febb332f6a8 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007febb3d34620 RCX: 00007febb304fe33 RDX: 0000000000000028 RSI: 00007febb3d34670 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00007febb332f6c4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 0000000000000000 R14: 00007febb3d34670 R15: 0000000000000000 INFO: task syz-executor:4457 blocked for more than 147 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:11456 pid:4457 tgid:4457 ppid:1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5259 [inline] __schedule+0x67c/0xa40 kernel/sched/core.c:6599 __schedule_loop kernel/sched/core.c:6676 [inline] schedule+0xac/0x140 kernel/sched/core.c:6691 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6748 __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: 0033:0x7f6300dcfe33 RSP: 002b:00007f63010af6a8 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f6301ab4620 RCX: 00007f6300dcfe33 RDX: 0000000000000040 RSI: 00007f6301ab4670 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00007f63010af6c4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f6301ab4670 R15: 0000000000000000 Showing all locks held in the system: 5 locks held by kworker/u8:0/11: 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 2 locks held by kworker/u8:3/37: 3 locks held by kworker/u8:6/2815: #0: ffff888103f5c948 ((wq_completion)ipv6_addrconf){....}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888103f5c948 ((wq_completion)ipv6_addrconf){....}-{0:0}, at: process_scheduled_works+0x2fd/0x8f0 kernel/workqueue.c:3312 #1: ffffc90007e53e48 ((work_completion)(&(&ifa->dad_work)->work)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc90007e53e48 ((work_completion)(&(&ifa->dad_work)->work)){....}-{0:0}, at: process_scheduled_works+0x324/0x8f0 kernel/workqueue.c:3312 #2: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: addrconf_dad_work+0x51/0x8b0 net/ipv6/addrconf.c:4194 2 locks held by getty/3177: #0: ffff88811307a0a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x50 drivers/tty/tty_ldisc.c:243 #1: ffffc900080db2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x34e/0xf50 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:2/3182: #0: ffff888100078d48 ((wq_completion)events_power_efficient){....}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888100078d48 ((wq_completion)events_power_efficient){....}-{0:0}, at: process_scheduled_works+0x2fd/0x8f0 kernel/workqueue.c:3312 #1: ffffc90001017e48 ((reg_check_chans).work){....}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc90001017e48 ((reg_check_chans).work){....}-{0:0}, at: process_scheduled_works+0x324/0x8f0 kernel/workqueue.c:3312 #2: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: reg_check_chans_work+0x3a/0x830 net/wireless/reg.c:2480 3 locks held by kworker/1:7/4276: #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: ffffc90001bdbe48 ((linkwatch_work).work){....}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc90001bdbe48 ((linkwatch_work).work){....}-{0:0}, at: process_scheduled_works+0x324/0x8f0 kernel/workqueue.c:3312 #2: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: linkwatch_event+0xe/0x30 net/core/link_watch.c:276 2 locks held by kworker/1:11/4293: 2 locks held by syz-executor/4377: 1 lock held by syz-executor/4384: #0: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: rtnetlink_rcv_msg+0x49a/0x620 net/core/rtnetlink.c:6644 1 lock held by syz-executor/4450: #0: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: rtnetlink_rcv_msg+0x49a/0x620 net/core/rtnetlink.c:6644 1 lock held by syz-executor/4457: #0: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: rtnetlink_rcv_msg+0x49a/0x620 net/core/rtnetlink.c:6644 2 locks held by syz-executor/5061: #0: ffffffff84e263d8 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/5100: #0: ffffffff84e263d8 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/5103: #0: ffffffff84e263d8 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/5160: #0: ffffffff84e263d8 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: setup_net+0x3ba/0x550 net/core/net_namespace.c:365 2 locks held by syz-executor/5182: #0: ffffffff84e263d8 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: register_netdev+0x13/0x50 net/core/dev.c:10570 2 locks held by syz-executor/5188: #0: ffffffff84e263d8 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: register_netdev+0x13/0x50 net/core/dev.c:10570 2 locks held by syz-executor/5244: #0: ffffffff84e263d8 (pernet_ops_rwsem){....}-{3:3}, at: copy_net_ns+0x27f/0x420 net/core/net_namespace.c:504 #1: ffffffff84e28458 (rtnl_mutex){....}-{3:3}, at: register_netdev+0x13/0x50 net/core/dev.c:10570 1 lock held by syz.4.101/5251: ============================================= 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: 4315 Comm: kworker/1:14 Not tainted 6.11.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events nsim_dev_trap_report_work RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline] RIP: 0010:write_comp_data kernel/kcov.c:235 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x90 kernel/kcov.c:304 Code: 44 0a 20 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 4c 8b 04 24 <65> 48 8b 14 25 40 04 03 00 65 8b 05 f0 cb c6 7e a9 00 01 ff 00 74 RSP: 0018:ffffc900000e8bc0 EFLAGS: 00000246 RAX: ffffffff8338af9c RBX: 0000000000000002 RCX: ffff888117333800 RDX: 0000000000000302 RSI: 0000000000000002 RDI: 0000000000000001 RBP: ffff888121899538 R08: ffffffff8338afe1 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8338f800 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888122e0a940 R15: ffff8881218994d8 FS: 0000000000000000(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562b3836f030 CR3: 000000011c4fe000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: xt_get_this_cpu_counter include/linux/netfilter/x_tables.h:435 [inline] ipt_do_table+0x3f1/0x710 net/ipv4/netfilter/ip_tables.c:297 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 spin_unlock_bh include/linux/spinlock.h:396 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline] nsim_dev_trap_report_work+0x35c/0x400 drivers/net/netdevsim/dev.c:850 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