INFO: task kworker/1:3:5861 blocked for more than 144 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:3 state:D stack:21600 pid:5861 tgid:5861 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1539/0x5080 kernel/sched/core.c:6907 __schedule_loop kernel/sched/core.c:6989 [inline] schedule+0x164/0x360 kernel/sched/core.c:7004 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776 class_wiphy_constructor include/net/cfg80211.h:6362 [inline] reg_leave_invalid_chans net/wireless/reg.c:2450 [inline] reg_check_chans_work+0x15a/0xf50 net/wireless/reg.c:2465 process_one_work+0x949/0x15a0 kernel/workqueue.c:3279 process_scheduled_works kernel/workqueue.c:3362 [inline] worker_thread+0xb46/0x1140 kernel/workqueue.c:3443 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Showing all locks held in the system: 3 locks held by kworker/u8:0/12: 3 locks held by kworker/u8:1/13: 2 locks held by kworker/1:0/24: 1 lock held by khungtaskd/30: #0: ffffffff8e75dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] #0: ffffffff8e75dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline] #0: ffffffff8e75dee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 3 locks held by kworker/u8:2/35: 2 locks held by kworker/u8:3/48: #0: ffff88813ff4c148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x855/0x15a0 kernel/workqueue.c:3254 #1: ffffc90000b97c40 ((work_completion)(&pool->idle_cull_work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x15a0 kernel/workqueue.c:3255 3 locks held by kworker/u8:4/58: 3 locks held by kworker/u8:5/142: 3 locks held by kworker/1:2/801: 3 locks held by kworker/u8:6/1156: 3 locks held by kworker/R-ipv6_/3190: #0: ffff888032425948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x855/0x15a0 kernel/workqueue.c:3254 #1: ffffc9000bd9fc00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x15a0 kernel/workqueue.c:3255 #2: ffffffff8fbba148 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff8fbba148 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4734 5 locks held by kworker/R-bat_e/3416: 3 locks held by kworker/u8:8/3552: 1 lock held by klogd/5194: 3 locks held by udevd/5205: 1 lock held by dhcpcd/5499: 1 lock held by crond/5574: 2 locks held by getty/5592: #0: ffff888032f160a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211 2 locks held by kworker/0:3/5813: 1 lock held by syz-executor/5830: 2 locks held by syz-executor/5850: 5 locks held by syz-executor/5854: 2 locks held by syz-executor/5859: 4 locks held by kworker/1:3/5861: #0: ffff88813ff0e148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x855/0x15a0 kernel/workqueue.c:3254 #1: ffffc9000430fc40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x87c/0x15a0 kernel/workqueue.c:3255 #2: ffffffff8fbba148 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0xa5/0xf50 net/wireless/reg.c:2462 #3: ffff888055e00788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6362 [inline] #3: ffff888055e00788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_leave_invalid_chans net/wireless/reg.c:2450 [inline] #3: ffff888055e00788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_check_chans_work+0x15a/0xf50 net/wireless/reg.c:2465 3 locks held by kworker/1:5/5959: #0: ffff88813ff0f548 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x855/0x15a0 kernel/workqueue.c:3254 #1: ffffc90005057c40 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x87c/0x15a0 kernel/workqueue.c:3255 #2: ffffffff8fbba148 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104 1 lock held by kmmpd-loop2/12083: #0: ffff888056380420 (sb_writers#4){.+.+}-{0:0}, at: kmmpd+0x3d1/0xa70 fs/ext4/mmp.c:174 5 locks held by udevd/12274: 3 locks held by kworker/u8:7/12413: 3 locks held by udevd/12752: 1 lock held by syz.5.2650/12883: 6 locks held by syz.0.2662/12918: 3 locks held by kworker/u8:9/12924: 3 locks held by kworker/u8:10/12926: 4 locks held by kworker/u8:11/12927: 3 locks held by kworker/u8:12/12928: 2 locks held by kworker/1:4/12929: 1 lock held by kworker/u8:13/12931: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x135/0x170 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline] watchdog+0xf90/0xfe0 kernel/hung_task.c:515 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3416 Comm: kworker/R-bat_e Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 Workqueue: bat_events batadv_tt_purge RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:879 [inline] RIP: 0010:class_rcu_destructor include/linux/rcupdate.h:1193 [inline] RIP: 0010:unwind_next_frame+0x1a58/0x23c0 arch/x86/kernel/unwind_orc.c:695 Code: c0 0f 85 a3 02 00 00 c6 03 01 4c 8b 7c 24 50 4c 8b 64 24 20 41 0f b6 04 2c 84 c0 0f 85 35 02 00 00 41 c7 06 00 00 00 00 31 db 13 e9 28 0a 85 c0 74 3a e8 0a e2 33 00 84 c0 75 31 e8 01 e9 28 RSP: 0018:ffffc90000a07ad8 EFLAGS: 00000202 RAX: ffffc90000a09000 RBX: ffffffff90a8b601 RCX: ffffc90000a07cf8 RDX: ffffc90000a07b01 RSI: dffffc0000000000 RDI: ffffc90000a07bb0 RBP: dffffc0000000000 R08: ffffc90000a07ce0 R09: 0000000000000000 R10: ffffc90000a07bf8 R11: fffff52000140f81 R12: ffffc90000a07cf0 R13: ffffc90000a01000 R14: ffffc90000a07ba8 R15: ffffffff81762295 FS: 0000000000000000(0000) GS:ffff8881253b4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2b8989a682 CR3: 000000007f458000 CR4: 00000000003526f0 Call Trace: arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5170 [inline] __kmalloc_noprof+0x35c/0x760 mm/slub.c:5182 kmalloc_noprof include/linux/slab.h:966 [inline] kzalloc_noprof include/linux/slab.h:1204 [inline] ieee802_11_parse_elems_full+0x159/0x2ab0 net/mac80211/parse.c:1031 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2475 [inline] ieee80211_inform_bss+0x161/0x1160 net/mac80211/scan.c:79 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline] cfg80211_inform_single_bss_data+0xcf9/0x1ab0 net/wireless/scan.c:2373 cfg80211_inform_bss_data+0x23f/0x3c20 net/wireless/scan.c:3228 cfg80211_inform_bss_frame_data+0x3c7/0x710 net/wireless/scan.c:3319 ieee80211_bss_info_update+0x794/0xa40 net/mac80211/scan.c:230 ieee80211_scan_rx+0x552/0xa40 net/mac80211/scan.c:364 __ieee80211_rx_handle_packet net/mac80211/rx.c:5297 [inline] ieee80211_rx_list+0x2508/0x3050 net/mac80211/rx.c:5554 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5577 ieee80211_rx include/net/mac80211.h:5218 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:929 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:626 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 spin_unlock_bh include/linux/spinlock.h:398 [inline] batadv_tt_local_purge+0x2a7/0x340 net/batman-adv/translation-table.c:1315 batadv_tt_purge+0x35/0x9e0 net/batman-adv/translation-table.c:3509 process_one_work+0x949/0x15a0 kernel/workqueue.c:3279 process_scheduled_works kernel/workqueue.c:3362 [inline] rescuer_thread+0x8a8/0x1210 kernel/workqueue.c:3586 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245