INFO: task syz.3.6378:26926 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.6378 state:D stack:27912 pid:26926 ppid:5793 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 schedule+0xbd/0x170 kernel/sched/core.c:6773 schedule_timeout+0x9b/0x280 kernel/time/timer.c:2143 ___down_common kernel/locking/semaphore.c:229 [inline] __down_common+0x308/0x640 kernel/locking/semaphore.c:250 down+0x80/0xd0 kernel/locking/semaphore.c:64 console_lock+0x145/0x1b0 kernel/printk/printk.c:2686 vt_ioctl+0x1b34/0x1d90 drivers/tty/vt/vt_ioctl.c:921 tty_ioctl+0x926/0xdd0 drivers/tty/tty_io.c:2779 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f03b418efc9 RSP: 002b:00007f03b4fc8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f03b43e5fa0 RCX: 00007f03b418efc9 RDX: 0000200000001440 RSI: 0000000000005609 RDI: 0000000000000003 RBP: 00007f03b4211f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f03b43e6038 R14: 00007f03b43e5fa0 R15: 00007ffd4f124ea8 Showing all locks held in the system: 1 lock held by kthreadd/2: 2 locks held by kworker/0:0/8: 4 locks held by kworker/u4:1/12: 3 locks held by kworker/1:0/23: 1 lock held by khungtaskd/29: #0: ffffffff8cd2fee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8cd2fee0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8cd2fee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633 2 locks held by kworker/u4:3/48: 4 locks held by kworker/u4:4/73: 2 locks held by kworker/u4:5/987: 4 locks held by kworker/u4:7/1314: 3 locks held by kworker/u4:9/2924: 7 locks held by kworker/u4:10/2930: 1 lock held by klogd/5150: 6 locks held by udevd/5161: 3 locks held by dhcpcd/5456: 5 locks held by dhcpcd/5457: 2 locks held by getty/5553: #0: ffff88802d9730a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x425/0x1380 drivers/tty/n_tty.c:2217 2 locks held by syz-executor/5783: 3 locks held by syz-executor/5792: 2 locks held by syz-executor/5800: 2 locks held by kworker/0:4/5854: 4 locks held by kworker/u4:0/15012: 6 locks held by syz.0.6369/26889: 3 locks held by kworker/u4:8/26929: 3 locks held by kworker/u4:11/26930: 2 locks held by udevd/26935: 2 locks held by kworker/0:5/26936: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 nmi_cpu_backtrace+0x39b/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xf41/0xf80 kernel/hung_task.c:379 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2930 Comm: kworker/u4:10 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:check_preemption_disabled+0x3/0x110 lib/smp_processor_id.c:13 Code: ff ff ff cc cc cc cc f3 0f 1e fa 48 c7 c7 a0 6a fc 8a 48 c7 c6 e0 6a fc 8a eb 0c 66 2e 0f 1f 84 00 00 00 00 00 66 90 55 41 57 <41> 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 RSP: 0018:ffffc90000007348 EFLAGS: 00000246 RAX: 1ffff11005a348d1 RBX: ffff88802d1a4000 RCX: ffff88802be59e00 RDX: 0000000000000100 RSI: ffffffff8afc6ae0 RDI: ffffffff8afc6aa0 RBP: ffffc90000007550 R08: ffffffff8e4a8d6f R09: 1ffffffff1c951ad R10: dffffc0000000000 R11: fffffbfff1c951ae R12: 0000000000000038 R13: 0000607f46e30180 R14: ffff8880605a0000 R15: ffff88802d1a4688 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd4c5b9d7c CR3: 0000000079606000 CR4: 00000000003506f0 Call Trace: dev_sw_netstats_rx_add include/linux/netdevice.h:2766 [inline] br_pass_frame_up+0x7c/0x410 net/bridge/br_input.c:39 br_handle_frame_finish+0x146c/0x1920 net/bridge/br_input.c:221 br_nf_hook_thresh+0x3b6/0x480 net/bridge/br_netfilter_hooks.c:1184 br_nf_pre_routing_finish_ipv6+0x9e3/0xd90 net/bridge/br_netfilter_ipv6.c:-1 NF_HOOK include/linux/netfilter.h:304 [inline] br_nf_pre_routing_ipv6+0x34d/0x680 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline] nf_hook_bridge_pre net/bridge/br_input.c:277 [inline] br_handle_frame+0x96b/0x1480 net/bridge/br_input.c:424 __netif_receive_skb_core+0xf6b/0x3ac0 net/core/dev.c:5502 __netif_receive_skb_one_core net/core/dev.c:5606 [inline] __netif_receive_skb+0x74/0x290 net/core/dev.c:5722 process_backlog+0x380/0x6e0 net/core/dev.c:6050 __napi_poll+0xc0/0x460 net/core/dev.c:6612 napi_poll net/core/dev.c:6679 [inline] net_rx_action+0x5ea/0xbf0 net/core/dev.c:6815 handle_softirqs+0x280/0x820 kernel/softirq.c:578 do_softirq+0xed/0x180 kernel/softirq.c:479 __local_bh_enable_ip+0x178/0x1c0 kernel/softirq.c:406 spin_unlock_bh include/linux/spinlock.h:396 [inline] cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2988 [inline] cfg80211_inform_bss_frame_data+0xb3b/0x12b0 net/wireless/scan.c:3013 ieee80211_bss_info_update+0x70b/0x930 net/mac80211/scan.c:211 ieee80211_rx_bss_info net/mac80211/ibss.c:1124 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1613 [inline] ieee80211_ibss_rx_queued_mgmt+0x17c9/0x2ac0 net/mac80211/ibss.c:1642 ieee80211_iface_process_skb net/mac80211/iface.c:1643 [inline] ieee80211_iface_work+0x717/0xc70 net/mac80211/iface.c:1697 cfg80211_wiphy_work+0x225/0x260 net/wireless/core.c:437 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293