INFO: task kworker/0:3:5094 blocked for more than 148 seconds. Not tainted 6.10.0-rc6-syzkaller-00215-g22f902dfc51e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:3 state:D stack:26752 pid:5094 tgid:5094 ppid:2 flags:0x00004000 Workqueue: events reg_todo Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6837 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wiphy_lock include/net/cfg80211.h:5966 [inline] reg_process_self_managed_hints+0x95/0x1e0 net/wireless/reg.c:3206 reg_todo+0x684/0x910 net/wireless/reg.c:3219 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3248 process_scheduled_works kernel/workqueue.c:3329 [inline] worker_thread+0x6c8/0xf30 kernel/workqueue.c:3409 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 Showing all locks held in the system: 3 locks held by kworker/0:1/9: 3 locks held by kworker/u8:1/12: 1 lock held by khungtaskd/30: #0: ffffffff8dbb1620 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8dbb1620 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8dbb1620 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614 3 locks held by kworker/u8:2/35: 3 locks held by kworker/u8:3/51: #0: ffff88802a14e948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3223 #1: ffffc90000bc7d80 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3224 #2: ffffffff8f748268 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4733 3 locks held by kworker/u8:4/61: 2 locks held by kworker/u8:5/141: 1 lock held by kworker/R-mld/2618: #0: ffffffff8da6b748 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool+0x95/0x3f0 kernel/workqueue.c:2729 3 locks held by kworker/u8:7/2782: 3 locks held by kworker/u8:8/2807: 3 locks held by kworker/u8:10/2870: 3 locks held by kworker/u8:11/2878: 3 locks held by kworker/u8:12/2891: 1 lock held by udevd/4537: 2 locks held by getty/4842: #0: ffff88802f9b20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/5086: #0: ffffffff8f748268 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff8f748268 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x250 drivers/net/tun.c:3500 1 lock held by syz-executor/5091: #0: ffffffff8f748268 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff8f748268 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x250 drivers/net/tun.c:3500 4 locks held by kworker/0:3/5094: #0: ffff888015480948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3223 #1: ffffc90003207d80 (reg_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3224 #2: ffffffff8f748268 (rtnl_mutex){+.+.}-{3:3}, at: reg_todo+0x1c/0x910 net/wireless/reg.c:3216 #3: ffff88802eb58768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5966 [inline] #3: ffff88802eb58768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: reg_process_self_managed_hints+0x95/0x1e0 net/wireless/reg.c:3206 1 lock held by kworker/R-wg-cr/5122: #0: ffffffff8da6b748 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x420 kernel/workqueue.c:2690 1 lock held by kworker/R-wg-cr/5125: #0: ffffffff8da6b748 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x420 kernel/workqueue.c:2690 1 lock held by kworker/R-wg-cr/5131: #0: ffffffff8da6b748 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool+0x95/0x3f0 kernel/workqueue.c:2729 1 lock held by kworker/R-wg-cr/5132: 1 lock held by kworker/R-wg-cr/5133: #0: ffffffff8da6b748 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x420 kernel/workqueue.c:2690 1 lock held by kworker/R-wg-cr/5135: #0: ffffffff8da6b748 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool+0x95/0x3f0 kernel/workqueue.c:2729 1 lock held by kworker/R-wg-cr/5137: #0: ffffffff8da6b748 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool+0x95/0x3f0 kernel/workqueue.c:2729 1 lock held by kworker/R-wg-cr/5138: #0: ffffffff8da6b748 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool+0x95/0x3f0 kernel/workqueue.c:2729 2 locks held by kworker/0:5/5141: 3 locks held by kworker/0:6/5142: #0: ffff888015481948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3223 #1: ffffc9000391fd80 ((crda_timeout).work){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3224 #2: ffffffff8f748268 (rtnl_mutex){+.+.}-{3:3}, at: crda_timeout_work+0x15/0x50 net/wireless/reg.c:540 1 lock held by kworker/0:7/5143: #0: ffffffff8da6b748 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x420 kernel/workqueue.c:2690 3 locks held by kworker/0:8/5144: #0: ffff888015481948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3223 #1: ffffc9000393fd80 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3224 #2: ffffffff8f748268 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x7d/0x10e0 net/wireless/reg.c:2478 1 lock held by syz.3.11/5226: 1 lock held by syz.0.17/5236: 6 locks held by syz.1.16/5238: 3 locks held by kworker/u8:13/5260: 1 lock held by syz-executor/5265: 1 lock held by syz-executor/5291: 3 locks held by dhcpcd-run-hook/5296: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc6-syzkaller-00215-g22f902dfc51e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 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+0xf86/0x1240 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 12 Comm: kworker/u8:1 Not tainted 6.10.0-rc6-syzkaller-00215-g22f902dfc51e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:stack_access_ok+0xc/0x270 arch/x86/kernel/unwind_orc.c:389 Code: 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 41 55 41 54 55 48 89 f5 <53> 48 89 fb 4c 8d 63 08 48 83 ec 10 48 89 54 24 08 e8 ee 0f 51 00 RSP: 0018:ffffc900001176a0 EFLAGS: 00000293 RAX: ffffc90000117f28 RBX: ffffc90000117750 RCX: ffffffff813cde89 RDX: 0000000000000008 RSI: ffffc90000117f28 RDI: ffffc90000117750 RBP: ffffc90000117f28 R08: 0000000000000001 R09: 0000000000000004 R10: 0000000000000002 R11: 0000000000000003 R12: ffffffff90733d86 R13: ffffc90000117f30 R14: ffffffff90733d8a R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0fb6a085e8 CR3: 00000000233a0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline] unwind_next_frame+0xd9b/0x23a0 arch/x86/kernel/unwind_orc.c:585 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 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4438 [inline] kmem_cache_free+0x12f/0x3a0 mm/slub.c:4513 skb_kfree_head net/core/skbuff.c:1067 [inline] skb_kfree_head net/core/skbuff.c:1064 [inline] skb_free_head+0x18a/0x1d0 net/core/skbuff.c:1081 skb_release_data+0x75c/0x980 net/core/skbuff.c:1108 skb_release_all net/core/skbuff.c:1173 [inline] __kfree_skb net/core/skbuff.c:1187 [inline] kfree_skb_reason+0x12b/0x210 net/core/skbuff.c:1223 kfree_skb include/linux/skbuff.h:1257 [inline] ieee80211_iface_work+0x435/0xf00 net/mac80211/iface.c:1659 cfg80211_wiphy_work+0x255/0x330 net/wireless/core.c:437 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3248 process_scheduled_works kernel/workqueue.c:3329 [inline] worker_thread+0x6c8/0xf30 kernel/workqueue.c:3409 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