INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 1, t=100002 jiffies, g=20487, c=20486, q=115) All QSes seen, last rcu_sched kthread activity 100002 (4294984038-4294884036), jiffies_till_next_fqs=3, root ->qsmask 0x0 syz-executor4 R running task 58720 7337 4521 0x00000008 Call Trace: sched_show_task+0x600/0x730 kernel/sched/core.c:5332 print_other_cpu_stall kernel/rcu/tree.c:1441 [inline] check_cpu_stall kernel/rcu/tree.c:1559 [inline] __rcu_pending kernel/rcu/tree.c:3244 [inline] rcu_pending kernel/rcu/tree.c:3291 [inline] rcu_check_callbacks+0x2627/0x2990 kernel/rcu/tree.c:2646 update_process_times+0x132/0x1a0 kernel/time/timer.c:1636 tick_sched_handle kernel/time/tick-sched.c:164 [inline] tick_sched_timer+0x3a6/0x500 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0xbfc/0x15b0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x458/0x13d0 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt+0x6b/0x250 arch/x86/kernel/apic/apic.c:1028 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1056 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:868 RIP: 0010:check_kcov_mode kernel/kcov.c:67 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x1d/0x50 kernel/kcov.c:101 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 04 24 65 48 8b 0c 25 80 fc 02 00 65 8b 14 25 94 fc 02 00 f7 c2 00 01 1f 00 75 2c <8b> 91 b8 18 00 00 83 fa 02 75 21 48 8b 91 c0 18 00 00 48 8b 32 48 RSP: 0018:ffff8801287af078 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81535185 RBX: 0000000000000001 RCX: ffff8801298fd880 RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea0006f2e1a0 RBP: ffff8801287af158 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff81174df0 R12: ffff8801287af0f8 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801298fe178 smp_call_function_many+0x658/0xdb0 kernel/smp.c:434 native_flush_tlb_others+0x4e8/0x500 arch/x86/mm/tlb.c:595 flush_tlb_mm_range+0x32b/0x450 arch/x86/mm/tlb.c:644 flush_tlb_page arch/x86/include/asm/tlbflush.h:526 [inline] ptep_clear_flush+0x11c/0x1f0 mm/pgtable-generic.c:87 wp_page_copy+0x160c/0x2480 mm/memory.c:2536 do_wp_page+0xe46/0x2ed0 mm/memory.c:2735 handle_pte_fault mm/memory.c:3988 [inline] __handle_mm_fault mm/memory.c:4096 [inline] handle_mm_fault+0x3373/0x7ea0 mm/memory.c:4133 __do_page_fault+0xc8b/0x17e0 arch/x86/mm/fault.c:1397 do_page_fault+0x98/0xd0 arch/x86/mm/fault.c:1474 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1169 RIP: 0010:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:66 Code: 38 4c 89 47 20 4c 89 4f 28 4c 89 57 30 4c 89 5f 38 48 8d 76 40 48 8d 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 <4c> 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a RSP: 0018:ffff8801287af9f8 EFLAGS: 00010206 RAX: ffffffff84050b1b RBX: 0000000000704000 RCX: 0000000000000005 RDX: 0000000000000000 RSI: ffff8801287afa70 RDI: 0000000000704076 RBP: ffff8801287afa60 R08: 0000000000006f6c R09: ffff88012c2efa70 R10: 0000000000000000 R11: ffffffff872f01c0 R12: 0000000000000000 R13: ffff8801287afa00 R14: 0000000000000000 R15: ffff8801298fe178 copy_to_user include/linux/uaccess.h:183 [inline] inet_gifconf+0x2e8/0x500 net/ipv4/devinet.c:1223 dev_ifconf+0x2b8/0x4e0 net/core/dev_ioctl.c:78 sock_do_ioctl+0x397/0x6b0 net/socket.c:984 sock_ioctl+0x7a8/0xd70 net/socket.c:1094 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0xc77/0x2670 fs/ioctl.c:686 ksys_ioctl fs/ioctl.c:701 [inline] __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x280/0x320 fs/ioctl.c:706 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457089 Code: fd 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3a9bc21c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3a9bc226d4 RCX: 0000000000457089 RDX: 00000000200000c0 RSI: 0000000000008912 RDI: 0000000000000005 RBP: 0000000000930280 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cd278 R14: 00000000004c3d61 R15: 0000000000000003 rcu_sched kthread starved for 100002 jiffies! g20487 c20486 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 RCU grace-period kthread stack dump: rcu_sched R running task 61928 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2857 [inline] __schedule+0x667/0x770 kernel/sched/core.c:3507 schedule+0x1bc/0x2d0 kernel/sched/core.c:3551 schedule_timeout+0x3f0/0x580 kernel/time/timer.c:1801 rcu_gp_kthread+0x1da1/0x3850 kernel/rcu/tree.c:2179 kthread+0x44d/0x480 kernel/kthread.c:247 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415