rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=24a/1/0x4000000000000000 softirq=119349/119350 fqs=1 (t=10502 jiffies g=219577 q=64) rcu: rcu_preempt kthread starved for 10501 jiffies! g219577 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:29080 pid: 10 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x148/0x250 kernel/time/timer.c:1879 rcu_gp_fqs_loop kernel/rcu/tree.c:1888 [inline] rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2058 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 NMI backtrace for cpu 1 CPU: 1 PID: 5478 Comm: syz-executor.5 Not tainted 5.8.0-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+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:318 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline] check_cpu_stall kernel/rcu/tree_stall.h:625 [inline] rcu_pending kernel/rcu/tree.c:3637 [inline] rcu_sched_clock_irq.cold+0x5b3/0xccd kernel/rcu/tree.c:2519 update_process_times+0x25/0xa0 kernel/time/timer.c:1710 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:1524 [inline] __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1588 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] sysvec_apic_timer_interrupt+0x4c/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:kfree+0x1e0/0x2c0 mm/slab.c:3757 Code: 4e 7e 0f 85 55 fe ff ff e8 1c 97 4c ff e9 4b fe ff ff e8 23 28 c6 ff 48 83 3d 63 56 02 08 00 0f 84 d2 00 00 00 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d 41 5c 41 5d c3 65 ff 05 bd 1e 4e 7e 48 8b 05 RSP: 0018:ffffc90000da8a70 EFLAGS: 00000282 RAX: 0000000000e06b0e RBX: 0000000000000282 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000282 RBP: ffff8881fe1fe000 R08: 0000000000000001 R09: ffffffff8c5f0ab7 R10: fffffbfff18be156 R11: 0000000000000001 R12: ffff8880aa040800 R13: ffffffff86367e39 R14: 0000000000000000 R15: ffff8881fe1fe6f0 skb_free_head net/core/skbuff.c:590 [inline] skb_release_data+0x6d9/0x910 net/core/skbuff.c:610 skb_release_all net/core/skbuff.c:664 [inline] __kfree_skb net/core/skbuff.c:678 [inline] kfree_skb.part.0+0xc2/0x350 net/core/skbuff.c:696 kfree_skb include/linux/refcount.h:270 [inline] kfree_skb_list+0xa3/0x150 net/core/skbuff.c:705 __dev_xmit_skb net/core/dev.c:3806 [inline] __dev_queue_xmit+0x14fd/0x2d60 net/core/dev.c:4105 mrp_queue_xmit net/802/mrp.c:351 [inline] mrp_join_timer+0x8a/0xc0 net/802/mrp.c:595 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768 __do_softirq+0x2de/0xa24 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/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+0x1f3/0x230 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:process_measurement+0x7fd/0x1760 security/integrity/ima/ima_main.c:362 Code: fe 48 c7 c0 88 47 b2 8a 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 a7 0e 00 00 48 8b 3d 8e 31 44 07 4c 89 e6 be f5 45 fe e8 19 2b 06 fe 44 8b 74 24 34 31 ff 44 89 f6 e8 8a RSP: 0018:ffffc90018827790 EFLAGS: 00000246 RAX: 1ffffffff15648f1 RBX: ffff88809e580d40 RCX: ffffc900135a5000 RDX: dffffc0000000000 RSI: ffff88820c10cc40 RDI: ffff8880aa241900 RBP: 1ffff92003104efc R08: 0000000000000001 R09: ffff8880473e17ff R10: ffffed1008e7c2ff R11: 0000000000000001 R12: ffff88820c10cc40 R13: 0000000000000000 R14: 00000000ffffffc3 R15: ffff8880473e18a8 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:492 do_open fs/namei.c:3253 [inline] path_openat+0x154d/0x2730 fs/namei.c:3368 do_filp_open+0x17e/0x3c0 fs/namei.c:3395 do_sys_openat2+0x16d/0x420 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d239 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd7219a0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000020e80 RCX: 000000000045d239 RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000000 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffe970ef75f R14: 00007fd7219a19c0 R15: 000000000118cf4c