rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2636 jiffies s: 1645 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 4719 Comm: kworker/0:3 Not tainted 6.11.0-rc7-syzkaller-00151-gd42f7708e27c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: events request_module_async
RIP: 0010:unwind_next_frame+0x1139/0x23a0 arch/x86/kernel/unwind_orc.c:665
Code: 74 08 3c 03 0f 8e 25 10 00 00 44 8b 23 89 ee 44 89 e7 e8 9a d1 4e 00 41 39 ec 0f 85 b1 00 00 00 e8 0c d0 4e 00 48 8b 54 24 10 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 5c 0f
RSP: 0018:ffffc900000066b0 EFLAGS: 00000006
RAX: 0000000000010305 RBX: ffffc90000006730 RCX: ffffffff813d0026
RDX: ffffc90000006768 RSI: ffffffff813d0034 RDI: 0000000000000004
RBP: 0000000000000002 R08: 0000000000000004 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556f68495a88 CR3: 000000000db7c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 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:2256 [inline]
 slab_free mm/slub.c:4477 [inline]
 kfree+0x12a/0x3b0 mm/slub.c:4598
 dummy_timer+0x1750/0x38d0 drivers/usb/gadget/udc/dummy_hcd.c:1981
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x43/0xb0 arch/x86/kernel/apic/apic.c:1043
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:in_softirq_really kernel/kcov.c:170 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:write_comp_data+0x24/0x90 kernel/kcov.c:245
Code: 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 65 48 8b 15 2f 0a 78 7e 65 8b 05 30 0a 78 7e a9 00 01 ff 00 74 1d f6 c4 01 74 67 <a9> 00 00 0f 00 75 60 a9 00 00 f0 00 75 59 8b 82 1c 16 00 00 85 c0
RSP: 0018:ffffc90000006fd8 EFLAGS: 00000202
RAX: 0000000000000303 RBX: ffffc90000007060 RCX: ffffffff813d0026
RDX: ffff88801df20000 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000001
 unwind_next_frame+0x1126/0x23a0 arch/x86/kernel/unwind_orc.c:664
 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_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541
 kvfree_call_rcu+0x74/0xbe0 kernel/rcu/tree.c:3815
 cfg80211_update_known_bss+0x39f/0x1150 net/wireless/scan.c:1891
 __cfg80211_bss_update+0x1aa/0x2560 net/wireless/scan.c:1937
 cfg80211_inform_single_bss_data+0x79b/0x1dc0 net/wireless/scan.c:2331
 cfg80211_inform_bss_data+0x205/0x39c0 net/wireless/scan.c:3159
 cfg80211_inform_bss_frame_data+0x271/0x7a0 net/wireless/scan.c:3254
 ieee80211_bss_info_update+0x311/0xab0 net/mac80211/scan.c:226
 ieee80211_scan_rx+0x474/0xac0 net/mac80211/scan.c:340
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5225 [inline]
 ieee80211_rx_list+0x1be3/0x2e90 net/mac80211/rx.c:5462
 ieee80211_rx_napi+0xdd/0x400 net/mac80211/rx.c:5485
 ieee80211_rx include/net/mac80211.h:5124 [inline]
 ieee80211_handle_queued_frames+0xd5/0x130 net/mac80211/main.c:439
 tasklet_action_common.constprop.0+0x24c/0x3e0 kernel/softirq.c:785
 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0x11cc/0x23a0 arch/x86/kernel/unwind_orc.c:665
Code: 8b 6b 10 4c 39 ed 73 36 e8 91 cf 4e 00 4c 8d 75 08 4d 39 f4 73 28 e8 83 cf 4e 00 4d 39 f5 72 1e e8 79 cf 4e 00 4c 8b 7c 24 18 <48> 89 ee 4c 89 ff e8 19 d1 4e 00 49 39 ef 0f 83 b5 0a 00 00 e8 5b
RSP: 0018:ffffc900044872d0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffc90004487350 RCX: ffffffff813d0026
RDX: ffff88801df20000 RSI: ffffffff813d00c7 RDI: ffffc90004487360
RBP: ffffc90004487f30 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90004480000
R13: ffffc90004488000 R14: ffffc90004487f38 R15: ffffc90004487ef0
 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:2256 [inline]
 slab_free mm/slub.c:4477 [inline]
 kfree+0x12a/0x3b0 mm/slub.c:4598
 free_modprobe_argv+0x55/0xa0 kernel/module/kmod.c:68
 call_usermodehelper_freeinfo kernel/umh.c:43 [inline]
 call_usermodehelper_exec+0x20e/0x4d0 kernel/umh.c:463
 call_modprobe kernel/module/kmod.c:103 [inline]
 __request_module+0x3f6/0x6c0 kernel/module/kmod.c:173
 dvb_module_probe+0x15b/0x340 drivers/media/dvb-core/dvbdev.c:1035
 em28178_dvb_init_pctv_292e drivers/media/usb/em28xx/em28xx-dvb.c:1293 [inline]
 em28xx_dvb_init drivers/media/usb/em28xx/em28xx-dvb.c:1947 [inline]
 em28xx_dvb_init+0x4853/0x8330 drivers/media/usb/em28xx/em28xx-dvb.c:1485
 em28xx_init_extension+0x137/0x200 drivers/media/usb/em28xx/em28xx-core.c:1117
 request_module_async+0x61/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3457
 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3393
 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
 </TASK>