watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [kworker/0:1:10] Modules linked in: irq event stamp: 6311012 hardirqs last enabled at (6311011): [] __local_bh_enable_ip+0xa4/0x120 kernel/softirq.c:455 hardirqs last disabled at (6311012): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (6311010): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (6311010): [] __alloc_skb+0x35d/0x410 net/core/skbuff.c:672 softirqs last disabled at (6311008): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (6311008): [] __alloc_skb+0x35d/0x410 net/core/skbuff.c:672 CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: usb_hub_wq hub_event RIP: 0010:__orc_find+0xb4/0xf0 arch/x86/kernel/unwind_orc.c:110 Code: 39 d5 73 af 4c 8d 63 fc 49 39 ec 73 b2 4d 29 f7 49 c1 ff 02 4b 8d 14 7f 48 8d 04 50 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f 07 e2 1d 06 48 83 c4 08 31 c0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 RSP: 0018:ffffc900000ae8c0 EFLAGS: 00000296 RAX: ffffffff8b31cdf0 RBX: 0000000000000001 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8acec394 RBP: ffffc900000ae980 R08: ffffffff8b31ce14 R09: 000000005c95b203 R10: 0000000000000002 R11: 0000000000028639 R12: ffffc900000ae988 R13: ffffc900000ae938 R14: ffffc900000ae96d R15: ffffffff8386392b FS: 0000000000000000(0000) GS:ffff888268bf4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000013c0 CR3: 000000011f3e0000 CR4: 00000000003506f0 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:227 [inline] unwind_next_frame+0x2ec/0x20a0 arch/x86/kernel/unwind_orc.c:494 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_slab_alloc+0x6e/0x70 mm/kasan/common.c:365 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_node_noprof+0x2a8/0x7e0 mm/slub.c:5315 __alloc_skb+0x156/0x410 net/core/skbuff.c:679 __netdev_alloc_skb+0x7a/0x920 net/core/skbuff.c:754 netdev_alloc_skb include/linux/skbuff.h:3484 [inline] dev_alloc_skb include/linux/skbuff.h:3497 [inline] ath6kl_usb_post_recv_transfers.constprop.0+0x55/0x400 drivers/net/wireless/ath/ath6kl/usb.c:428 ath6kl_usb_start_recv_pipes drivers/net/wireless/ath/ath6kl/usb.c:498 [inline] hif_start drivers/net/wireless/ath/ath6kl/usb.c:703 [inline] ath6kl_usb_power_on+0x8e/0x160 drivers/net/wireless/ath/ath6kl/usb.c:1062 ath6kl_hif_power_on drivers/net/wireless/ath/ath6kl/hif-ops.h:136 [inline] ath6kl_core_init+0x17e/0x11b0 drivers/net/wireless/ath/ath6kl/core.c:97 ath6kl_usb_probe+0xcee/0x1440 drivers/net/wireless/ath/ath6kl/usb.c:1168 usb_probe_interface+0x303/0xa80 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xb20 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x350 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4e0 drivers/base/dd.c:1031 device_initial_probe+0xaa/0xc0 drivers/base/dd.c:1086 bus_probe_device+0x64/0x150 drivers/base/bus.c:574 device_add+0x116e/0x1980 drivers/base/core.c:3689 usb_set_configuration+0x1187/0x1e50 drivers/usb/core/message.c:2210 usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xb20 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x350 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4e0 drivers/base/dd.c:1031 device_initial_probe+0xaa/0xc0 drivers/base/dd.c:1086 bus_probe_device+0x64/0x150 drivers/base/bus.c:574 device_add+0x116e/0x1980 drivers/base/core.c:3689 usb_new_device+0xd07/0x1a90 drivers/usb/core/hub.c:2695 hub_port_connect drivers/usb/core/hub.c:5567 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x31bf/0x5420 drivers/usb/core/hub.c:5953 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x74f/0xa30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Sending NMI from CPU 0 to CPUs 1: usb 3-1: pegasus_irq - nonzero urb status received: -71 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 2845 Comm: acpid Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:memchr+0x0/0x80 lib/string.c:806 Code: e8 85 b2 8e fa 48 8b 14 24 e9 79 ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 01 fa 48 bd 00 00 00 00 00 fc ff df 53 48 83 ec RSP: 0018:ffffc900001a8350 EFLAGS: 00000083 RAX: 0000000000008ba7 RBX: 0000000000000037 RCX: ffffc90001202000 RDX: 0000000000000037 RSI: 000000000000000a RDI: ffffffff93acd5a0 RBP: ffffc900001a84b0 R08: 0000000000000007 R09: 0000000000000000 R10: 000000007fffffff R11: 00000000001b3143 R12: 0000000000000017 R13: 0000000000000800 R14: 0000000000000000 R15: ffffffff93acd5a0 FS: 00007f1f9c95e740(0000) GS:ffff888268cf4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9463bf6d58 CR3: 0000000117542000 CR4: 00000000003506f0 Call Trace: memchr include/linux/fortify-string.h:739 [inline] record_print_text+0x16a/0x400 kernel/printk/printk.c:1441 printk_get_next_message+0x2d1/0x6d0 kernel/printk/printk.c:3018 console_emit_next_record kernel/printk/printk.c:3083 [inline] console_flush_one_record+0x684/0xc60 kernel/printk/printk.c:3215 console_flush_all kernel/printk/printk.c:3289 [inline] __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xef/0x240 kernel/printk/printk.c:3359 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426 dev_vprintk_emit drivers/base/core.c:4914 [inline] dev_printk_emit+0xfa/0x140 drivers/base/core.c:4925 __dev_printk+0xf5/0x270 drivers/base/core.c:4937 _dev_err+0xe4/0x120 drivers/base/core.c:4980 pegasus_irq+0xe3/0x630 drivers/input/tablet/pegasus_notetaker.c:198 __usb_hcd_giveback_urb+0x38b/0x610 drivers/usb/core/hcd.c:1661 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745 dummy_timer+0x1809/0x3ad0 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858 handle_softirqs+0x208/0x940 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_flush_one_record+0x995/0xc60 kernel/printk/printk.c:3216 Code: 00 e8 8f 65 29 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 8d 49 21 00 48 85 ed 0f 85 8e 01 00 00 e8 af 4e 21 00 fb 4c 89 e8 <48> c1 e8 03 42 80 3c 38 00 0f 84 b4 fe ff ff 4c 89 ef e8 74 1b 83 RSP: 0018:ffffc9000156f2d8 EFLAGS: 00000293 RAX: ffffffff89816558 RBX: 0000000000000001 RCX: ffffffff815e9df3 RDX: ffff888117553a80 RSI: ffffffff815e9e01 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: ffff888117554528 R12: 0000000000000001 R13: ffffffff89816558 R14: ffffffff89816500 R15: dffffc0000000000 console_flush_all kernel/printk/printk.c:3289 [inline] __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xef/0x240 kernel/printk/printk.c:3359 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426 dev_vprintk_emit drivers/base/core.c:4914 [inline] dev_printk_emit+0xfa/0x140 drivers/base/core.c:4925 __dev_printk+0xf5/0x270 drivers/base/core.c:4937 _dev_err+0xe4/0x120 drivers/base/core.c:4980 pegasus_control_msg.constprop.0+0x1d2/0x210 drivers/input/tablet/pegasus_notetaker.c:120 pegasus_set_mode drivers/input/tablet/pegasus_notetaker.c:132 [inline] __pegasus_open drivers/input/tablet/pegasus_notetaker.c:230 [inline] pegasus_open+0x1bf/0x350 drivers/input/tablet/pegasus_notetaker.c:251 input_open_device+0x237/0x3d0 drivers/input/input.c:601 evdev_open_device drivers/input/evdev.c:391 [inline] evdev_open+0x52f/0x690 drivers/input/evdev.c:478 chrdev_open+0x234/0x6a0 fs/char_dev.c:414 do_dentry_open+0x723/0x13e0 fs/open.c:962 vfs_open+0x82/0x3f0 fs/open.c:1094 do_open fs/namei.c:4628 [inline] path_openat+0x2078/0x3140 fs/namei.c:4787 do_filp_open+0x20b/0x470 fs/namei.c:4814 do_sys_openat2+0x120/0x260 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1447 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x570 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1f9c9e8407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffffeb3c400 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f1f9c95e740 RCX: 00007f1f9c9e8407 RDX: 0000000000080800 RSI: 00007ffffeb3c610 RDI: ffffffffffffff9c RBP: 00007ffffeb3c610 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000020 R13: 00007ffffeb3c710 R14: 000055a0400947fe R15: 00007ffffeb3c710