INFO: task kworker/0:1:24 blocked for more than 140 seconds. Not tainted 4.14.302-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:1 D26576 24 2 0x80000000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 linkwatch_event+0xa/0x50 net/core/link_watch.c:236 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 INFO: task kworker/1:2:4626 blocked for more than 140 seconds. Not tainted 4.14.302-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:2 D27584 4626 2 0x80000000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 reg_check_chans_work+0x77/0xd00 net/wireless/reg.c:1655 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 Showing all locks held in the system: 3 locks held by kworker/0:1/24: #0: ("events"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((linkwatch_work).work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 #2: (rtnl_mutex){+.+.}, at: [] linkwatch_event+0xa/0x50 net/core/link_watch.c:236 1 lock held by khungtaskd/1532: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 3 locks held by kworker/1:2/4626: #0: ("events_power_efficient"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((reg_check_chans).work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 #2: (rtnl_mutex){+.+.}, at: [] reg_check_chans_work+0x77/0xd00 net/wireless/reg.c:1655 1 lock held by in:imklog/7699: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:819 3 locks held by kworker/1:3/7706: #0: ("%s"("ipv6_addrconf")){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((addr_chk_work).work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 #2: (rtnl_mutex){+.+.}, at: [] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4421 1 lock held by syz-fuzzer/8008: #0: (&mm->mmap_sem){++++}, at: [] SYSC_madvise mm/madvise.c:827 [inline] #0: (&mm->mmap_sem){++++}, at: [] SyS_madvise+0x19f/0x18c0 mm/madvise.c:791 1 lock held by syz-fuzzer/8009: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x7b8/0xad0 arch/x86/mm/fault.c:1378 3 locks held by syz-executor.4/8015: #0: (&hdev->req_lock){+.+.}, at: [] hci_dev_do_close+0xa8/0xd80 net/bluetooth/hci_core.c:1589 #1: (&hdev->lock){+.+.}, at: [] hci_dev_do_close+0x264/0xd80 net/bluetooth/hci_core.c:1628 #2: (uevent_sock_mutex){+.+.}, at: [] kobject_uevent_env+0x755/0xf30 lib/kobject_uevent.c:460 3 locks held by syz-executor.1/8030: #0: (&hdev->req_lock){+.+.}, at: [] hci_dev_do_close+0xa8/0xd80 net/bluetooth/hci_core.c:1589 #1: (&hdev->lock){+.+.}, at: [] hci_dev_do_close+0x264/0xd80 net/bluetooth/hci_core.c:1628 #2: (uevent_sock_mutex){+.+.}, at: [] kobject_uevent_env+0x755/0xf30 lib/kobject_uevent.c:460 3 locks held by syz-executor.2/9664: #0: (&hdev->req_lock){+.+.}, at: [] hci_dev_do_close+0xa8/0xd80 net/bluetooth/hci_core.c:1589 #1: (&hdev->lock){+.+.}, at: [] hci_dev_do_close+0x264/0xd80 net/bluetooth/hci_core.c:1628 #2: (uevent_sock_mutex){+.+.}, at: [] kobject_uevent_env+0x755/0xf30 lib/kobject_uevent.c:460 3 locks held by syz-executor.5/9678: #0: (vlan_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x313/0x4c0 net/socket.c:1047 #1: (rtnl_mutex){+.+.}, at: [] vlan_ioctl_handler+0x9a/0xcb0 net/8021q/vlan.c:518 #2: (uevent_sock_mutex){+.+.}, at: [] kobject_uevent_env+0x755/0xf30 lib/kobject_uevent.c:460 3 locks held by syz-executor.3/9675: #0: (&hdev->req_lock){+.+.}, at: [] hci_dev_do_close+0xa8/0xd80 net/bluetooth/hci_core.c:1589 #1: (&hdev->lock){+.+.}, at: [] hci_dev_do_close+0x264/0xd80 net/bluetooth/hci_core.c:1628 #2: (uevent_sock_mutex){+.+.}, at: [] kobject_uevent_env+0x755/0xf30 lib/kobject_uevent.c:460 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.302-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.302-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events_power_efficient fb_flashcursor task: ffff8880b54aa4c0 task.stack: ffff8880b54b8000 RIP: 0010:unwind_next_frame+0xc8a/0x17d0 arch/x86/kernel/unwind_orc.c:423 RSP: 0018:ffff8880ba507998 EFLAGS: 00000246 RAX: ffff8880b54bff18 RBX: 1ffff110174a0f3a RCX: ffffffff8a6b7114 RDX: ffff8880ba507aa0 RSI: 0000000000000000 RDI: ffff8880ba507a58 RBP: 0000000000000001 R08: ffffffff8a6b7118 R09: ffffffff8a6b7119 R10: 000000000000bba0 R11: 0000000000000001 R12: ffff8880ba507a8d R13: ffff8880ba507a90 R14: ffff8880ba507aa8 R15: ffff8880ba507a58 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056062ff83160 CR3: 000000009c59d000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc_node mm/slab.c:3333 [inline] kmem_cache_alloc_node_trace+0x13d/0x400 mm/slab.c:3659 __do_kmalloc_node mm/slab.c:3681 [inline] __kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3696 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0x96/0x510 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:980 [inline] bcm_can_tx+0x1c1/0x690 net/can/bcm.c:301 bcm_tx_timeout_tsklet+0x179/0x320 net/can/bcm.c:428 tasklet_action+0x195/0x340 kernel/softirq.c:513 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:796 RIP: 0010:lock_acquire+0x1f5/0x3f0 kernel/locking/lockdep.c:4002 RSP: 0018:ffff8880b54bfcc0 EFLAGS: 00000296 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e13d9 RBX: ffff8880b54aa4c0 RCX: 8e3b9771c4acfc2e RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffffffff88f6f3e0 R08: 0000000000000001 R09: 0000000000048006 R10: ffff8880b54aad98 R11: ffff8880b54aa4c0 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 __down_trylock_console_sem+0x11f/0x1e0 kernel/printk/printk.c:235 console_trylock+0x14/0x70 kernel/printk/printk.c:2246 fb_flashcursor+0x40/0x3f0 drivers/video/fbdev/core/fbcon.c:356 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 Code: e8 3c 90 5b 00 48 8b 4c 24 08 e9 71 fe ff ff 48 8b 44 24 58 4c 89 ff 4c 89 4c 24 30 48 8b 54 24 08 48 89 4c 24 28 4c 89 44 24 20 <48> 8d 70 f8 48 89 44 24 18 e8 c8 f1 ff ff 84 c0 0f 84 5a f7 ff