rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=439649, q=799) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295275447-4295264945), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g439649 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:28800 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1892 rcu_gp_fqs_loop kernel/rcu/tree.c:2004 [inline] rcu_gp_kthread+0xd07/0x2300 kernel/rcu/tree.c:2177 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 21075 Comm: syz-executor.4 Not tainted 5.13.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kfree_skbmem+0x25/0x1b0 net/core/skbuff.c:682 Code: 00 00 00 00 00 41 54 55 48 89 fd 53 e8 44 8c 6f fa 48 8d 7d 7e 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 <48> 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 56 01 00 00 0f b6 5d 7e RSP: 0018:ffffc90000dc0cb8 EFLAGS: 00000a07 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000100 RDX: 1ffff110043ac777 RSI: ffffffff8705503c RDI: ffff888021d63bbe RBP: ffff888021d63b40 R08: 0000000000000001 R09: ffffffff902278a7 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888021d63c1c R13: ffff8880551db410 R14: 0000000000000000 R15: ffff8880551d8d50 FS: 00007f982dcd9700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31622000 CR3: 00000000441cc000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __kfree_skb net/core/skbuff.c:741 [inline] consume_skb net/core/skbuff.c:896 [inline] consume_skb+0xcf/0x160 net/core/skbuff.c:890 mac80211_hwsim_tx_frame+0x157/0x1e0 drivers/net/wireless/mac80211_hwsim.c:1781 mac80211_hwsim_beacon_tx+0x4ba/0x910 drivers/net/wireless/mac80211_hwsim.c:1834 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1857 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x609/0xe40 kernel/time/hrtimer.c:1601 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1618 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559 invoke_softirq kernel/softirq.c:433 [inline] __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:apply_to_existing_page_range+0x2/0x40 mm/memory.c:2607 Code: 14 46 cb ff 49 89 d8 4c 89 f1 5b 4c 89 ea 4c 89 e6 48 89 ef 5d 41 b9 01 00 00 00 41 5c 41 5d 41 5e e9 72 ef ff ff 66 90 41 56 <49> 89 ce 41 55 49 89 d5 41 54 49 89 f4 55 48 89 fd 53 4c 89 c3 e8 RSP: 0018:ffffc9000208f698 EFLAGS: 00000206 RAX: 1ffff920003a1000 RBX: 0000000001d08000 RCX: ffffffff81b9e9c0 RDX: 0000000000002000 RSI: fffff520003a1000 RDI: ffffffff8c0a00e0 RBP: fffff520003a1000 R08: 0000000000000000 R09: ffffffff902278a7 R10: ffffffff81ae8442 R11: 0000000000000000 R12: fffff520003a3000 R13: ffffc90001d08000 R14: 0000000000017000 R15: dffffc0000000000 kasan_release_vmalloc+0xa7/0xc0 mm/kasan/shadow.c:479 __purge_vmap_area_lazy+0x8f9/0x1c50 mm/vmalloc.c:1652 _vm_unmap_aliases.part.0+0x3dd/0x4f0 mm/vmalloc.c:2055 _vm_unmap_aliases mm/vmalloc.c:2029 [inline] vm_unmap_aliases+0x47/0x50 mm/vmalloc.c:2078 change_page_attr_set_clr+0x241/0x500 arch/x86/mm/pat/set_memory.c:1740 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1797 [inline] set_memory_ro+0x78/0xa0 arch/x86/mm/pat/set_memory.c:1943 bpf_jit_binary_lock_ro include/linux/filter.h:852 [inline] bpf_int_jit_compile+0xe11/0x11b0 arch/x86/net/bpf_jit_comp.c:2329 bpf_prog_select_runtime+0x464/0x6a0 kernel/bpf/core.c:1867 bpf_prog_load+0xe75/0x1f40 kernel/bpf/syscall.c:2221 __do_sys_bpf+0x1272/0x4f40 kernel/bpf/syscall.c:4411 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f982dcd9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd132171cf R14: 00007f982dcd9300 R15: 0000000000022000