rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10403 ticks this GP) idle=2144/1/0x4000000000000000 softirq=125657/125714 fqs=4672 rcu: hardirqs softirqs csw/system rcu: number: 1445812 272 0 rcu: cputime: 20074 32414 30 ==> 52500(ms) rcu: (t=10502 jiffies g=166377 q=2726 ncpus=2) CPU: 0 PID: 31949 Comm: syz.3.8712 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__sanitizer_cov_trace_cmp4+0x82/0x90 kernel/kcov.c:288 Code: 8d 52 28 4d 39 ca 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 04 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 48 8b 04 24 RSP: 0018:ffffc90000007390 EFLAGS: 00000246 RAX: ffffffff813b38d2 RBX: dffffc0000000000 RCX: 0000000000000100 RDX: ffff888068910000 RSI: 000000000019b2bf RDI: 000000000019b2ca RBP: 000000000019b2ca R08: ffffc90000007530 R09: 000000000000000b R10: 0000000000000004 R11: 0000000000000100 R12: ffffc90000007468 R13: 000000000019b2bf R14: ffffc9000000749d R15: 000000000009042d FS: 00007f00c7dc66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555794374e8 CR3: 00000000313af000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0fff DR7: 0000000000000600 Call Trace: __orc_find arch/x86/kernel/unwind_orc.c:90 [inline] orc_find arch/x86/kernel/unwind_orc.c:227 [inline] unwind_next_frame+0x2b2/0x2970 arch/x86/kernel/unwind_orc.c:494 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_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] kmem_cache_alloc_node+0x14c/0x320 mm/slub.c:3540 kmalloc_reserve+0x95/0x240 net/core/skbuff.c:562 __alloc_skb+0x138/0x2c0 net/core/skbuff.c:653 __netdev_alloc_skb+0x10c/0x500 net/core/skbuff.c:717 netdev_alloc_skb include/linux/skbuff.h:3272 [inline] dev_alloc_skb include/linux/skbuff.h:3285 [inline] __ieee80211_beacon_get+0xe17/0x1600 net/mac80211/tx.c:5447 ieee80211_beacon_get_tim+0xbf/0x580 net/mac80211/tx.c:5569 ieee80211_beacon_get include/net/mac80211.h:5440 [inline] mac80211_hwsim_beacon_tx+0x3c7/0x780 drivers/net/wireless/virtual/mac80211_hwsim.c:2265 __iterate_interfaces+0x243/0x500 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:2295 __run_hrtimer kernel/time/hrtimer.c:1750 [inline] __hrtimer_run_queues+0x52a/0xc40 kernel/time/hrtimer.c:1814 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1831 handle_softirqs+0x280/0x820 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 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:7010 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 01 2d d0 f6 e8 9c 31 01 f7 fb bf 01 00 00 00 f1 b4 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f RSP: 0018:ffffc90003597960 EFLAGS: 00000286 RAX: ab2ad331cf26ef00 RBX: 0000000000000000 RCX: ab2ad331cf26ef00 RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: 0000000000000001 RBP: ffffc90003597a00 R08: ffffffff8e8ad9ef R09: 1ffffffff1d15b3d R10: dffffc0000000000 R11: fffffbfff1d15b3e R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920006b2f2c irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:task_mm_cid_work+0x115/0x770 kernel/sched/core.c:11976 Code: 11 06 00 00 48 81 c3 40 05 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 1b d7 80 00 <48> 8b 03 48 89 44 24 18 48 85 c0 0f 84 da 05 00 00 48 8b 44 24 18 RSP: 0018:ffffc90003597ac0 EFLAGS: 00000246 RAX: 1ffff1100d1220a8 RBX: ffff888068910540 RCX: dffffc0000000000 RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: ffff888068911580 RBP: ffffc90003597bb0 R08: ffffffff8e8ad9ef R09: 1ffffffff1d15b3d R10: dffffc0000000000 R11: fffffbfff1d15b3e R12: dffffc0000000000 R13: ffff888068911580 R14: ffff88806891002c R15: 0000000100028d49 task_work_run+0x1d4/0x260 kernel/task_work.c:245 get_signal+0x1235/0x13f0 kernel/signal.c:2678 arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f00c6f9acb9 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:00007f00c7dc6028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 0000000000000004 RBX: 00007f00c7215fa0 RCX: 00007f00c6f9acb9 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140 RBP: 00007f00c7008bf7 R08: 0000000000000002 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f00c7216038 R14: 00007f00c7215fa0 R15: 00007ffca5417798