INFO: task syz.0.4185:13867 blocked for more than 145 seconds. Not tainted 6.11.0-rc5-syzkaller-00219-g1934261d8974 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.4185 state:D stack:28352 pid:13867 tgid:13865 ppid:5439 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xe37/0x5490 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6621 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 tty_open_by_driver drivers/tty/tty_io.c:2052 [inline] tty_open+0x55b/0xfb0 drivers/tty/tty_io.c:2135 chrdev_open+0x26d/0x6f0 fs/char_dev.c:414 do_dentry_open+0x91f/0x15f0 fs/open.c:959 vfs_open+0x82/0x3f0 fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x2141/0x2d20 fs/namei.c:3886 do_filp_open+0x1dc/0x430 fs/namei.c:3913 do_sys_openat2+0x17a/0x1e0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1442 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0b7f978850 RSP: 002b:00007f0b80749b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f0b7f978850 RDX: 0000000000000002 RSI: 00007f0b80749c10 RDI: 00000000ffffff9c RBP: 00007f0b80749c10 R08: 0000000000000000 R09: 00007f0b80749987 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f0b7fb15f80 R15: 00007ffdf7a9b2d8 Showing all locks held in the system: 4 locks held by kworker/0:1/9: 1 lock held by kworker/R-mm_pe/13: #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2730 [inline] #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x87c/0xe30 kernel/workqueue.c:3524 5 locks held by kworker/1:0/25: 1 lock held by khungtaskd/30: #0: ffffffff8ddb9fe0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #0: ffffffff8ddb9fe0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8ddb9fe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6626 4 locks held by kworker/1:1/46: 4 locks held by kworker/u8:5/144: #0: ffff88804ec4f148 ((wq_completion)wg-kex-wg0#7){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206 #1: ffffc90002d97d80 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207 #2: ffff8880631c1248 (&wg->static_identity.lock){++++}-{3:3}, at: wg_noise_handshake_create_initiation+0xed/0x650 drivers/net/wireguard/noise.c:529 #3: ffff88807aa34e38 (&handshake->lock){++++}-{3:3}, at: wg_noise_handshake_create_initiation+0x101/0x650 drivers/net/wireguard/noise.c:530 3 locks held by kworker/0:2/942: 2 locks held by kworker/u8:7/1107: 4 locks held by kworker/u8:8/1126: 1 lock held by kworker/R-dm_bu/2375: #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x420 kernel/workqueue.c:2671 4 locks held by kworker/u8:10/2533: 3 locks held by syslogd/4659: 2 locks held by dhcpcd/4890: 2 locks held by getty/4978: #0: ffff888030ae70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/5435: 1 lock held by syz-executor/5438: 3 locks held by syz-executor/5444: 4 locks held by syz-executor/5445: 1 lock held by syz-executor/5448: #0: ffff8880300c8308 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_target+0xab/0x290 net/netfilter/x_tables.c:254 1 lock held by kworker/R-wg-cr/5468: #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x420 kernel/workqueue.c:2671 1 lock held by kworker/R-wg-cr/5470: #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x420 kernel/workqueue.c:2671 1 lock held by kworker/R-wg-cr/5474: #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x420 kernel/workqueue.c:2671 2 locks held by kworker/R-wg-cr/5475: 1 lock held by kworker/R-wg-cr/5476: #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2730 [inline] #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x87c/0xe30 kernel/workqueue.c:3524 1 lock held by kworker/R-wg-cr/5478: #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2730 [inline] #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x87c/0xe30 kernel/workqueue.c:3524 1 lock held by kworker/R-wg-cr/5479: #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2730 [inline] #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x87c/0xe30 kernel/workqueue.c:3524 1 lock held by kworker/R-wg-cr/5481: 1 lock held by kworker/R-wg-cr/5482: #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2730 [inline] #0: ffffffff8dc73f48 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x87c/0xe30 kernel/workqueue.c:3524 1 lock held by kworker/R-wg-cr/5483: 2 locks held by kworker/0:3/5484: 4 locks held by kworker/0:4/5486: 5 locks held by kworker/1:5/5487: 2 locks held by kworker/0:5/5506: 4 locks held by kworker/0:6/5524: 4 locks held by kworker/0:7/5531: 1 lock held by syz.0.4185/13867: #0: ffffffff8e9bb748 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2052 [inline] #0: ffffffff8e9bb748 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55b/0xfb0 drivers/tty/tty_io.c:2135 2 locks held by kworker/1:3/13874: 3 locks held by kworker/0:0/13877: 3 locks held by kworker/1:9/13878: 9 locks held by kworker/0:8/13880: 3 locks held by kworker/0:9/13881: 2 locks held by syz-executor/13884: 3 locks held by kworker/1:12/13885: #0: ffff88802f9b2d48 ((wq_completion)wg-kex-wg0#4){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206 #1: ffffc9001847fd80 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __asm__ ("" : "=r"(__ptr) : "0"((typeof(*((worker))) *)((worker)))); (typeof((typeof(*((worker))) *)((worker)))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207 #2: ffff88807aa30338 (&handshake->lock){++++}-{3:3}, at: wg_noise_handshake_begin_session+0x30/0xe80 drivers/net/wireguard/noise.c:822 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc5-syzkaller-00219-g1934261d8974 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 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+0xf0c/0x1240 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 13880 Comm: kworker/0:8 Not tainted 6.11.0-rc5-syzkaller-00219-g1934261d8974 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: events nsim_dev_trap_report_work RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline] RIP: 0010:write_comp_data+0x11/0x90 kernel/kcov.c:245 Code: cc cc cc cc 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 65 48 8b 15 7f 1a 78 7e <65> 8b 05 80 1a 78 7e a9 00 01 ff 00 74 1d f6 c4 01 74 67 a9 00 00 RSP: 0018:ffffc90000006e28 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc90000006ef8 RCX: ffffffff813cdd16 RDX: ffff888022309e00 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffffc90000007b98 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000000 R12: ffffc90000006f00 R13: ffffc90000006f08 R14: ffffc90000000000 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc259e67ff8 CR3: 000000000db7c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_stack arch/x86/include/asm/stacktrace.h:60 [inline] stack_access_ok+0x96/0x270 arch/x86/kernel/unwind_orc.c:393 deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline] unwind_next_frame+0x1b94/0x23a0 arch/x86/kernel/unwind_orc.c:648 arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] ref_tracker_alloc+0x17c/0x5b0 lib/ref_tracker.c:203 __netdev_tracker_alloc include/linux/netdevice.h:4047 [inline] netdev_hold include/linux/netdevice.h:4076 [inline] dst_init+0xda/0x580 net/core/dst.c:52 dst_alloc+0xbb/0x1a0 net/core/dst.c:93 ip6_dst_alloc+0x2c/0x90 net/ipv6/route.c:342 icmp6_dst_alloc+0x70/0x490 net/ipv6/route.c:3275 ndisc_send_skb+0x1279/0x1c30 net/ipv6/ndisc.c:491 ndisc_send_na+0x46b/0xa50 net/ipv6/ndisc.c:576 ndisc_recv_ns+0x8cb/0x1430 net/ipv6/ndisc.c:960 ndisc_rcv+0x558/0x620 net/ipv6/ndisc.c:1860 icmpv6_rcv+0x11da/0x1930 net/ipv6/icmp.c:979 ip6_protocol_deliver_rcu+0xf70/0x1510 net/ipv6/ip6_input.c:438 ip6_input_finish+0x14f/0x2f0 net/ipv6/ip6_input.c:483 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip6_input+0xa1/0xd0 net/ipv6/ip6_input.c:492 ip6_mc_input+0x48b/0xfd0 net/ipv6/ip6_input.c:586 dst_input include/net/dst.h:460 [inline] dst_input include/net/dst.h:458 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ipv6_rcv+0x45a/0x680 net/ipv6/ip6_input.c:310 __netif_receive_skb_one_core+0x12e/0x1e0 net/core/dev.c:5661 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5775 process_backlog+0x443/0x15f0 net/core/dev.c:6108 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6772 napi_poll net/core/dev.c:6841 [inline] net_rx_action+0xa92/0x1010 net/core/dev.c:6963 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 do_softirq kernel/softirq.c:455 [inline] do_softirq+0xb2/0xf0 kernel/softirq.c:442 __local_bh_enable_ip+0x100/0x120 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+0x870/0xc80 drivers/net/netdevsim/dev.c:850 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244