rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P150/1:b..l (detected by 1, t=10502 jiffies, g=102125, q=977) task:kworker/u4:2 state:R running task stack:24456 pid: 150 ppid: 2 flags:0x00004000 Workqueue: phy66 ieee80211_iface_work Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6302 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6702 irqentry_exit+0x31/0x80 kernel/entry/common.c:427 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:ieee80211_sta_get_rates+0x692/0x960 net/mac80211/util.c:2111 Code: 44 24 10 01 48 8b 44 24 10 41 39 c4 0f 8f d8 fc ff ff e8 21 dd e5 f8 8b 44 24 3c 48 83 c4 60 5b 5d 41 5c 41 5d 41 5e 41 5f c3 09 dd e5 f8 48 8b 44 24 18 48 b9 00 00 00 00 00 fc ff df 48 8d RSP: 0018:ffffc9000143f490 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008 RDX: 0000000000000000 RSI: ffff88801637b900 RDI: 0000000000000003 RBP: 000000000000000c R08: 000000000000000a R09: 0000000000000048 R10: ffffffff8890298e R11: 0000000000000000 R12: 000000000000000a R13: 000000000000000c R14: 000000000000000a R15: 0000000000000000 ieee80211_update_sta_info net/mac80211/ibss.c:1003 [inline] ieee80211_rx_bss_info net/mac80211/ibss.c:1117 [inline] ieee80211_rx_mgmt_probe_beacon+0x546/0x17c0 net/mac80211/ibss.c:1608 ieee80211_ibss_rx_queued_mgmt+0xd37/0x1610 net/mac80211/ibss.c:1635 ieee80211_iface_process_skb net/mac80211/iface.c:1439 [inline] ieee80211_iface_work+0xa65/0xd00 net/mac80211/iface.c:1493 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: rcu_preempt kthread starved for 10491 jiffies! g102125 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:28696 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6302 schedule+0xd3/0x270 kernel/sched/core.c:6381 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 26864 Comm: syz-executor.3 Not tainted 5.14.0-next-20210830-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:55 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x48/0x180 mm/kasan/generic.c:189 Code: b8 ff ff ff ff ff 7f ff ff 48 39 c7 0f 86 05 01 00 00 49 83 e9 01 48 89 fd 48 b8 00 00 00 00 00 fc ff df 4d 89 ca 48 c1 ed 03 <49> c1 ea 03 48 01 c5 49 01 c2 48 89 e8 49 8d 5a 01 48 89 da 48 29 RSP: 0018:ffffc900000070c0 EFLAGS: 00000806 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff815b5d31 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d6e7a10 RBP: 1ffffffff1adcf42 R08: 0000000000000000 R09: ffffffff8d6e7a17 R10: ffffffff8d6e7a17 R11: 0000000000000000 R12: ffffffff8b99ef08 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b9c22440 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000542978 CR3: 000000002586a000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] cpumask_test_cpu include/linux/cpumask.h:379 [inline] cpu_online include/linux/cpumask.h:921 [inline] trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0xa1/0x720 kernel/locking/lockdep.c:5636 seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] ktime_get+0x8d/0x470 kernel/time/timekeeping.c:827 hrtimer_forward_now include/linux/hrtimer.h:506 [inline] perf_swevent_hrtimer+0x246/0x3f0 kernel/events/core.c:10548 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:preempt_count_sub+0x5f/0x150 kernel/sched/core.c:5454 Code: d5 0e 85 c9 75 1b 65 8b 05 8e 5c b2 7e 89 c2 81 e2 ff ff ff 7f 39 da 7c 13 81 fb fe 00 00 00 76 63 f7 db 65 01 1d 71 5c b2 7e <5b> c3 e8 0a 3c 85 02 85 c0 74 f5 48 c7 c0 28 ae 6e 8d 48 ba 00 00 RSP: 0018:ffffc90000007688 EFLAGS: 00000213 RAX: 0000000000000103 RBX: 00000000ffffffff RCX: 0000000000000000 RDX: 0000000000000103 RSI: ffffc9000b77ff58 RDI: 0000000000000001 RBP: 00007fed91c93188 R08: ffffffff8e8012d6 R09: 0000000000000001 R10: fffff52000000ef9 R11: 0000000000086089 R12: ffffc9000b778000 R13: ffffc9000b77ff58 R14: ffffc90000007770 R15: ffffc9000b77ff58 unwind_next_frame+0xec8/0x1ce0 arch/x86/kernel/unwind_orc.c:611 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:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x83/0xb0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3182 [inline] kmem_cache_alloc_node+0x259/0x3d0 mm/slub.c:3218 __alloc_skb+0x20b/0x340 net/core/skbuff.c:414 skb_copy+0x137/0x2f0 net/core/skbuff.c:1585 mac80211_hwsim_tx_frame_no_nl.isra.0+0xb17/0x1330 drivers/net/wireless/mac80211_hwsim.c:1565 mac80211_hwsim_tx_frame+0x1ee/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1784 mac80211_hwsim_beacon_tx+0x49b/0x930 drivers/net/wireless/mac80211_hwsim.c:1838 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1861 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:folio_test_anon include/linux/page-flags.h:572 [inline] RIP: 0010:PageAnon include/linux/page-flags.h:577 [inline] RIP: 0010:page_remove_rmap+0x6f/0x1480 mm/rmap.c:1350 Code: ff 49 89 de 41 83 e6 01 4c 89 f6 e8 3b 76 c6 ff 4d 85 f6 0f 85 c5 07 00 00 e8 cd 70 c6 ff 48 89 eb e8 c5 70 c6 ff 48 8d 7b 18 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f RSP: 0018:ffffc9000b77f760 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffea0001255780 RCX: 0000000000000000 RDX: ffff888021e08000 RSI: ffffffff81af98fb RDI: ffffea0001255798 RBP: ffffea0001255780 R08: 0000000000000000 R09: ffffea0001255787 R10: ffffffff81af98e5 R11: 0000000000000000 R12: ffffea0001255788 R13: 0000000000000000 R14: 0000000000000000 R15: 00007fed92d15000 zap_pte_range mm/memory.c:1362 [inline] zap_pmd_range mm/memory.c:1481 [inline] zap_pud_range mm/memory.c:1510 [inline] zap_p4d_range mm/memory.c:1531 [inline] unmap_page_range+0xed5/0x2a10 mm/memory.c:1552 unmap_single_vma+0x198/0x310 mm/memory.c:1597 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629 exit_mmap+0x1d0/0x620 mm/mmap.c:3194 __mmput+0x122/0x470 kernel/fork.c:1154 mmput+0x58/0x60 kernel/fork.c:1175 exit_mm kernel/exit.c:501 [inline] do_exit+0xabc/0x2a30 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 Code: Unable to access opcode bytes at RIP 0x4665cf. RSP: 002b:00007fed91c93188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffa1 RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000040 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffca57dee6f R14: 00007fed91c93300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 44 24 10 rex.R and $0x10,%al 3: 01 48 8b add %ecx,-0x75(%rax) 6: 44 24 10 rex.R and $0x10,%al 9: 41 39 c4 cmp %eax,%r12d c: 0f 8f d8 fc ff ff jg 0xfffffcea 12: e8 21 dd e5 f8 callq 0xf8e5dd38 17: 8b 44 24 3c mov 0x3c(%rsp),%eax 1b: 48 83 c4 60 add $0x60,%rsp 1f: 5b pop %rbx 20: 5d pop %rbp 21: 41 5c pop %r12 23: 41 5d pop %r13 25: 41 5e pop %r14 27: 41 5f pop %r15 29: c3 retq * 2a: e8 09 dd e5 f8 callq 0xf8e5dd38 <-- trapping instruction 2f: 48 8b 44 24 18 mov 0x18(%rsp),%rax 34: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 3b: fc ff df 3e: 48 rex.W 3f: 8d .byte 0x8d