rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10476 ticks this GP) idle=cffc/1/0x4000000000000000 softirq=20113/20114 fqs=4990
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1936150        465            0
rcu: 	cputime:    26935      25553           33   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=23253 q=1753 ncpus=2)
CPU: 0 PID: 8172 Comm: syz.1.839 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:241 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0x6d/0xe0 kernel/kcov.c:346
Code: 4c 09 01 48 8b 54 24 20 65 4c 8b 05 4d d4 7b 7e 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 65 44 8b 1d 3b d4 7b 7e <41> 81 e3 00 01 ff 00 74 13 41 81 fb 00 01 00 00 75 d9 41 83 b8 24
RSP: 0018:ffffc90000007610 EFLAGS: 00000202
RAX: 0000000000000008 RBX: 0000000000000000 RCX: 0000000000000003
RDX: ffffffff813beb18 RSI: ffffffff8dfa0a80 RDI: 0000000000000009
RBP: ffffc90000007758 R08: ffff8880605e1e00 R09: 0000000000000006
R10: 0000000000000008 R11: 0000000000000102 R12: ffffffff90b089b0
R13: ffffc90000007708 R14: 0000000000000009 R15: dffffc0000000000
FS:  00007fcf870796c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff4487f5c38 CR3: 000000002d9c2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x748/0x2990 arch/x86/kernel/unwind_orc.c:515
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1833 [inline]
 slab_free_freelist_hook+0x154/0x240 mm/slub.c:1859
 slab_free mm/slub.c:3853 [inline]
 kmem_cache_free+0xf8/0x290 mm/slub.c:3875
 mac80211_hwsim_beacon_tx+0x3df/0x770 drivers/net/wireless/virtual/mac80211_hwsim.c:2275
 __iterate_interfaces+0x225/0x4c0 net/mac80211/util.c:766
 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:802
 mac80211_hwsim_beacon+0xbb/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2301
 __run_hrtimer kernel/time/hrtimer.c:1754 [inline]
 __hrtimer_run_queues+0x525/0xc10 kernel/time/hrtimer.c:1818
 hrtimer_run_softirq+0x177/0x290 kernel/time/hrtimer.c:1835
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7032
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 6f bf 01 00 00 00 e8 11 fe bc f6 e8 4c 1d ee f6 fb bf 01 00 00 00 <e8> 71 b3 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc90018b17860 EFLAGS: 00000286
RAX: c8c382a69274e500 RBX: 0000000000000000 RCX: c8c382a69274e500
RDX: dffffc0000000000 RSI: ffffffff8aead140 RDI: 0000000000000001
RBP: ffffc90018b17900 R08: ffffffff8f8dda6f R09: 1ffffffff1f1bb4d
R10: dffffc0000000000 R11: fffffbfff1f1bb4e R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92003162f0c
 irqentry_exit+0x67/0x70 kernel/entry/common.c:441
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:spin_unlock_irqrestore include/linux/spinlock.h:-1 [inline]
RIP: 0010:fill_tgid_exit kernel/taskstats.c:295 [inline]
RIP: 0010:taskstats_exit+0x4f1/0xce0 kernel/taskstats.c:629
Code: 38 08 f8 42 c6 44 38 04 f8 43 80 3c 3c 00 74 08 4c 89 f7 e8 81 a2 57 00 49 8b 3e 48 8b 74 24 08 e8 e4 4e 18 09 bb 94 03 00 00 <45> 31 f6 4c 8b 24 24 48 c7 c0 c0 c4 02 00 65 48 03 05 d1 d4 78 7e
RSP: 0018:ffffc90018b179c0 EFLAGS: 00000246
RAX: c8c382a69274e500 RBX: 0000000000000394 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8aead140 RDI: 00000000ffffffff
RBP: ffffc90018b17ab0 R08: ffffffff8f8dda6f R09: 1ffffffff1f1bb4d
R10: dffffc0000000000 R11: fffffbfff1f1bb4e R12: 1ffff1100c0bc4e4
R13: ffff8880276248d8 R14: ffff8880605e2720 R15: dffffc0000000000
 do_exit+0x8fc/0x2530 kernel/exit.c:866
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1032
 get_signal+0x12a6/0x1390 kernel/signal.c:2927
 arch_do_signal_or_restart+0xc2/0x7b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
 __syscall_exit_to_user_mode_work kernel/entry/common.c:294 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:305
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fcf8619f559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcf87079028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: 0000000000000090 RBX: 00007fcf86425fa0 RCX: 00007fcf8619f559
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000380
RBP: 00007fcf86236b20 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcf86426038 R14: 00007fcf86425fa0 R15: 00007fff8480a0b8
 </TASK>