rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10499 ticks this GP) idle=155/1/0x4000000000000000 softirq=119219/119219 fqs=4 (t=10501 jiffies g=220025 q=374) rcu: rcu_preempt kthread starved for 10243 jiffies! g220025 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:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x186/0x800 kernel/rcu/tree.c:1957 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2130 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: 13883 Comm: syz-executor.0 Not tainted 5.15.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:native_apic_mem_write+0x8/0x10 arch/x86/include/asm/apic.h:110 Code: c7 00 a8 ee 8e e8 48 ae 8a 00 eb b0 66 0f 1f 44 00 00 be 01 00 00 00 e9 86 15 2d 00 cc cc cc cc cc cc 89 ff 89 b7 00 c0 5f ff 0f 1f 80 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 53 89 fb 48 RSP: 0018:ffffc90000007560 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff8b338a60 RCX: 0000000000000020 RDX: 1ffffffff166714e RSI: 00000000000000ee RDI: 0000000000000380 RBP: ffff8880b9c1f300 R08: 000000000000003f R09: 0000000000000000 R10: ffffffff8168dae7 R11: 0000000000000000 R12: 00000000000000ee R13: 0000000000000020 R14: 0000000000000000 R15: ffff8880b9c223c0 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb182f623a4 CR3: 000000000b68e000 CR4: 00000000003506f0 Call Trace: apic_write arch/x86/include/asm/apic.h:394 [inline] lapic_next_event+0x4d/0x80 arch/x86/kernel/apic/apic.c:469 clockevents_program_event+0x254/0x370 kernel/time/clockevents.c:334 tick_program_event+0xac/0x140 kernel/time/tick-oneshot.c:44 hrtimer_interrupt+0x36e/0x790 kernel/time/hrtimer.c:1824 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:unwind_next_frame+0x8b2/0x1ce0 arch/x86/kernel/unwind_orc.c:521 Code: 85 54 12 00 00 83 e0 07 40 38 c6 40 0f 9e c7 40 84 f6 0f 95 c0 40 84 c7 0f 85 3b 12 00 00 49 0f bf 00 48 01 d0 48 89 44 24 60 aa fd ff ff 49 8d 7e 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa RSP: 0018:ffffc90000007760 EFLAGS: 00000286 RAX: ffffc90000007960 RBX: 1ffff92000000ef4 RCX: ffffffff8decb14f RDX: ffffc900000078d0 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000002 R08: ffffffff8decb14a R09: 0000000000000001 R10: fffff52000000f12 R11: 0000000000086089 R12: ffffc90000007880 R13: ffffc9000000786d R14: ffffc90000007838 R15: ffffffff8decb14e 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+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook+0x81/0x190 mm/slub.c:1725 slab_free mm/slub.c:3483 [inline] kfree+0xe4/0x530 mm/slub.c:4543 skb_free_head net/core/skbuff.c:654 [inline] skb_release_data+0x65a/0x790 net/core/skbuff.c:676 skb_release_all net/core/skbuff.c:741 [inline] __kfree_skb net/core/skbuff.c:755 [inline] consume_skb net/core/skbuff.c:911 [inline] consume_skb+0xc2/0x160 net/core/skbuff.c:905 mac80211_hwsim_tx_frame+0x1f6/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1785 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+0xcd/0x1c0 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:kasan_check_range+0xe/0x180 mm/kasan/generic.c:188 Code: f5 00 00 00 e9 b3 80 3b 02 0f 1f 00 48 89 f2 be f8 00 00 00 e9 a3 80 3b 02 0f 1f 00 48 85 f6 0f 84 70 01 00 00 49 89 f9 41 54 <44> 0f b6 c2 49 01 f1 55 53 0f 82 18 01 00 00 48 b8 ff ff ff ff ff RSP: 0018:ffffc90003e2f750 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81b0b17b RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffea0001224af0 RBP: ffffea0001224ac0 R08: 0000000000000000 R09: ffffea0001224af0 R10: ffffffff81b0b10b R11: 0000000000000000 R12: ffffea0001224ac8 R13: 0000000000000000 R14: 0000000000000000 R15: 00007f3b38ddb000 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_add_negative include/linux/atomic/atomic-instrumented.h:556 [inline] page_remove_file_rmap mm/rmap.c:1280 [inline] page_remove_rmap+0x6eb/0x1480 mm/rmap.c:1351 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+0x1d0/0x630 mm/mmap.c:3171 __mmput+0x122/0x4b0 kernel/fork.c:1115 mmput+0x58/0x60 kernel/fork.c:1136 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:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f3b3abae8d9 Code: Unable to access opcode bytes at RIP 0x7f3b3abae8af. RSP: 002b:00007f3b38125188 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: 0000000000000004 RBX: 00007f3b3acb2f60 RCX: 00007f3b3abae8d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000280 RBP: 00007f3b3ac08cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3b3b1e6b2f R14: 00007f3b38125300 R15: 0000000000022000 NMI backtrace for cpu 1 CPU: 1 PID: 13880 Comm: syz-executor.3 Not tainted 5.15.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline] check_cpu_stall kernel/rcu/tree_stall.h:711 [inline] rcu_pending kernel/rcu/tree.c:3880 [inline] rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2599 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421 __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:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x2d/0x60 kernel/kcov.c:197 Code: 79 f1 8b 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 40 f0 01 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 3c 15 00 00 <85> c0 74 2b 8b 82 18 15 00 00 83 f8 02 75 20 48 8b 8a 20 15 00 00 RSP: 0018:ffffc90000dc0cc8 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 00000000000002a5 RCX: 0000000000000100 RDX: ffff88801dd19c80 RSI: ffffffff8751c6d0 RDI: 0000000000000003 RBP: ffff88807a3e1b50 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff87517fd5 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000007 R14: 0000000000000400 R15: ffff88807a3e1b00 fq_pie_timer+0x170/0x2a0 net/sched/sch_fq_pie.c:383 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __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:page_remove_file_rmap mm/rmap.c:1257 [inline] RIP: 0010:page_remove_rmap+0x67b/0x1480 mm/rmap.c:1351 Code: ff 44 89 ee e8 d6 53 c5 ff 45 84 ed 0f 85 c4 03 00 00 e8 88 4d c5 ff 48 89 ef e8 50 45 07 00 31 ff 89 c3 89 c6 e8 b5 54 c5 ff <85> db 74 59 e8 6c 4d c5 ff 48 8d 7d 54 be 04 00 00 00 e8 1e a6 0c RSP: 0018:ffffc90003ddf760 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88801dd19c80 RDI: 0000000000000003 RBP: ffffea0001f15980 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81b0b10b R11: 0000000000000000 R12: ffffea0001f15988 R13: 0000000000000000 R14: 0000000000000000 R15: 00007fe6f069b000 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+0x1d0/0x630 mm/mmap.c:3171 __mmput+0x122/0x4b0 kernel/fork.c:1115 mmput+0x58/0x60 kernel/fork.c:1136 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:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe6f21d88d9 Code: Unable to access opcode bytes at RIP 0x7fe6f21d88af. RSP: 002b:00007fe6ef74f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffff0 RBX: 00007fe6f22dcf60 RCX: 00007fe6f21d88d9 RDX: 0000000000000005 RSI: 0000000000004c00 RDI: 0000000000000004 RBP: 00007fe6f2232cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe6f2810b2f R14: 00007fe6ef74f300 R15: 0000000000022000 raw-gadget gadget: ignoring, device is not running ---------------- Code disassembly (best guess): 0: c7 00 a8 ee 8e e8 movl $0xe88eeea8,(%rax) 6: 48 ae rex.W scas %es:(%rdi),%al 8: 8a 00 mov (%rax),%al a: eb b0 jmp 0xffffffbc c: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) 12: be 01 00 00 00 mov $0x1,%esi 17: e9 86 15 2d 00 jmpq 0x2d15a2 1c: cc int3 1d: cc int3 1e: cc int3 1f: cc int3 20: cc int3 21: cc int3 22: 89 ff mov %edi,%edi 24: 89 b7 00 c0 5f ff mov %esi,-0xa04000(%rdi) * 2a: c3 retq <-- trapping instruction 2b: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 32: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 39: fc ff df 3c: 53 push %rbx 3d: 89 fb mov %edi,%ebx 3f: 48 rex.W