rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (9735 ticks this GP) idle=0ce/1/0x4000000000000000 softirq=9507/9508 fqs=4834 (t=10502 jiffies g=8265 q=91) NMI backtrace for cpu 1 CPU: 1 PID: 8732 Comm: syz-executor009 Not tainted 5.10.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline] check_cpu_stall kernel/rcu/tree_stall.h:637 [inline] rcu_pending kernel/rcu/tree.c:3694 [inline] rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567 update_process_times+0x77/0xd0 kernel/time/timer.c:1709 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:__orc_find+0xa3/0xf0 arch/x86/kernel/unwind_orc.c:60 Code: 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 04 46 <48> 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 83 c4 10 31 c0 5b RSP: 0018:ffffc90000d90768 EFLAGS: 00000256 RAX: ffffffff8d66d11e RBX: ffffffff8cfb7020 RCX: ffffffff81601e0a RDX: 0000000000000000 RSI: ffffffff8d66d11e RDI: ffffffff8cfb7020 RBP: ffffffff8cfb7024 R08: ffffffff8d66d124 R09: ffffffff8d66d11e R10: 0000000000082081 R11: 0000000000016fe3 R12: ffffffff8cfb7020 R13: ffffffff8cfb7020 R14: 0000000000000000 R15: dffffc0000000000 orc_find arch/x86/kernel/unwind_orc.c:173 [inline] unwind_next_frame+0x342/0x1f90 arch/x86/kernel/unwind_orc.c:443 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0x102/0x140 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1544 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1577 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3158 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:622 __kfree_skb net/core/skbuff.c:679 [inline] consume_skb net/core/skbuff.c:834 [inline] consume_skb+0xcf/0x160 net/core/skbuff.c:828 mac80211_hwsim_tx_frame+0x157/0x1e0 drivers/net/wireless/mac80211_hwsim.c:1706 mac80211_hwsim_beacon_tx+0x4ba/0x910 drivers/net/wireless/mac80211_hwsim.c:1759 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:792 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:828 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1782 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x693/0xea0 kernel/time/hrtimer.c:1583 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:196 Code: fc ff ff 48 c7 c7 00 d5 38 8b 48 89 54 24 08 48 89 34 24 e8 72 b3 5e 02 48 8b 54 24 08 48 8b 34 24 e9 a1 fd ff ff 0f 1f 40 00 <65> 48 8b 14 25 00 f0 01 00 65 8b 05 40 eb 91 7e a9 00 01 ff 00 48 RSP: 0018:ffffc9000210f950 EFLAGS: 00000282 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffff92000421f0d RDX: 1ffff110173e6172 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff8880b9f30b90 R08: 0000000000000001 R09: ffffffff8ebaf67f R10: fffffbfff1d75ecf R11: 0000000000000000 R12: ffffffff8ae3c6c8 R13: 1ffff92000421f2e R14: 0000000000000007 R15: ffff8880313786c0 lru_add_drain_cpu+0xdc/0x990 mm/swap.c:632 lru_add_drain+0x108/0x430 mm/swap.c:734 exit_mmap+0x27a/0x530 mm/mmap.c:3215 __mmput+0x122/0x470 kernel/fork.c:1079 mmput+0x53/0x60 kernel/fork.c:1100 exit_mm kernel/exit.c:486 [inline] do_exit+0xa72/0x29b0 kernel/exit.c:796 do_group_exit+0x125/0x310 kernel/exit.c:906 get_signal+0x42a/0x1f10 kernel/signal.c:2758 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x442b19 Code: Unable to access opcode bytes at RIP 0x442aef. RSP: 002b:00007ffc5d162e08 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: 0000000020ffc000 RBX: 00007ffc5d162e40 RCX: 0000000000442b19 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffc000 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000003 R13: 00000000006d3dc8 R14: 00000000006d4440 R15: 0000000000000004