mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium rcu: INFO: rcu_sched detected stalls on CPUs/tasks: rcu: 0-....: (10442 ticks this GP) idle=b96/1/0x4000000000000004 softirq=44414/44624 fqs=5234 rcu: (detected by 1, t=10502 jiffies, g=2613, q=5) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 20862 Comm: syz-executor.2 Not tainted 4.19.158-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:23 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:67 [inline] RIP: 0010:write_comp_data+0xf/0x70 kernel/kcov.c:122 Code: 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 c3 0f 1f 84 00 00 00 00 00 49 89 f1 49 89 fa 65 48 8b 34 25 80 df 01 00 <65> 8b 05 aa 0e 9d 7e a9 00 01 1f 00 75 4f 8b 86 d8 12 00 00 83 f8 RSP: 0018:ffff8880ba0071a8 EFLAGS: 00000006 RAX: ffff888041108280 RBX: ffff888049308bd8 RCX: ffffffff81562ba0 RDX: 000000862ad58c69 RSI: ffff888041108280 RDI: 0000000000000006 RBP: 0000000000003c43 R08: ffffffff8c65b018 R09: 000000862ad5c8ac R10: 0000000000000006 R11: ffffffff8c65b01b R12: 000000862ad5c8ac R13: 000000862ad58c69 R14: 0000000000000001 R15: 000000862ad58c69 FS: 00007fa2c9c31700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000563fdc183ef8 CR3: 0000000009e6d000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ktime_add_safe kernel/time/hrtimer.c:331 [inline] hrtimer_add_expires include/linux/hrtimer.h:249 [inline] hrtimer_forward+0x130/0x260 kernel/time/hrtimer.c:936 hrtimer_forward_now include/linux/hrtimer.h:479 [inline] perf_swevent_hrtimer+0x326/0x3e0 kernel/events/core.c:9242 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:__orc_find+0x8b/0xf0 arch/x86/kernel/unwind_orc.c:52 Code: 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 01 d8 48 39 c1 73 b0 <4c> 8d 63 fc 49 39 ec 73 b3 4d 29 ee 49 c1 fe 02 4b 8d 04 76 48 8d RSP: 0018:ffff8880ba007748 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff13 RAX: ffffffff88201495 RBX: ffffffff8b889cb0 RCX: ffffffff8820145e RDX: 0000000000000000 RSI: ffffffff8c113e1a RDI: ffffffff8b889c80 RBP: ffffffff8b889c80 R08: ffffffff8c113eb6 R09: ffffffff8c113e1a R10: 0000000000074071 R11: 000000000016216b R12: ffffffff8b889ce4 R13: ffffffff8b889c80 R14: ffffffff8b889c80 R15: dffffc0000000000 orc_find arch/x86/kernel/unwind_orc.c:159 [inline] unwind_next_frame+0x33b/0x1c60 arch/x86/kernel/unwind_orc.c:422 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 __build_skb+0x39/0x300 net/core/skbuff.c:281 __netdev_alloc_skb+0x2a7/0x460 net/core/skbuff.c:426 netdev_alloc_skb include/linux/skbuff.h:2675 [inline] dev_alloc_skb include/linux/skbuff.h:2688 [inline] __ieee80211_beacon_get+0xc7d/0x1a30 net/mac80211/tx.c:4332 ieee80211_beacon_get_tim+0x88/0x890 net/mac80211/tx.c:4443 ieee80211_beacon_get include/net/mac80211.h:4484 [inline] mac80211_hwsim_beacon_tx+0xff/0x680 drivers/net/wireless/mac80211_hwsim.c:1577 __iterate_interfaces+0x2e1/0x4a0 net/mac80211/util.c:614 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:650 mac80211_hwsim_beacon+0xc9/0x190 drivers/net/wireless/mac80211_hwsim.c:1615 __tasklet_hrtimer_trampoline+0x29/0xa0 kernel/softirq.c:601 tasklet_action_common.constprop.0+0x265/0x360 kernel/softirq.c:522 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:__mod_memcg_state include/linux/memcontrol.h:586 [inline] RIP: 0010:__mod_lruvec_state include/linux/memcontrol.h:669 [inline] RIP: 0010:__mod_lruvec_page_state include/linux/memcontrol.h:703 [inline] RIP: 0010:page_remove_file_rmap+0x279/0xa30 mm/rmap.c:1244 Code: ed 01 4c 89 fa 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 3a 07 00 00 49 8b 84 24 90 06 00 00 65 48 8b 68 68 <4c> 01 ed bf 20 00 00 00 48 89 ea 48 c1 fa 3f 48 89 d0 48 31 e8 48 RSP: 0018:ffff888040f7f6f8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000607f45c043b8 RBX: ffff88813be80040 RCX: ffffffff83801923 RDX: 1ffff1104765a1ea RSI: ffffffff83801931 RDI: 0000000000000005 RBP: ffffffffffffffe3 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff88823b2d08c0 R13: ffffffffffffffff R14: ffffea00018cce00 R15: ffff88823b2d0f50 page_remove_rmap+0xe5/0x120 mm/rmap.c:1300 zap_pte_range mm/memory.c:1350 [inline] zap_pmd_range mm/memory.c:1452 [inline] zap_pud_range mm/memory.c:1481 [inline] zap_p4d_range mm/memory.c:1502 [inline] unmap_page_range+0x12f6/0x2a70 mm/memory.c:1523 unmap_single_vma+0x198/0x300 mm/memory.c:1568 unmap_vmas+0xa9/0x180 mm/memory.c:1598 exit_mmap+0x2b9/0x530 mm/mmap.c:3093 __mmput kernel/fork.c:1015 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1036 exit_mm kernel/exit.c:549 [inline] do_exit+0xaf0/0x2be0 kernel/exit.c:877 do_group_exit+0x125/0x310 kernel/exit.c:993 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45deb9 Code: Bad RIP value. RSP: 002b:00007fa2c9c30c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000097 RAX: 0000000000000000 RBX: 0000000000021240 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 000000000118bff8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bfd4 R13: 00007ffdf70b996f R14: 00007fa2c9c319c0 R15: 000000000118bfd4