INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=2928, c=2927, q=6) All QSes seen, last rcu_sched kthread activity 10433 (4294975866-4294965433), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.3 R running task 27888 10005 7446 0x00000008 Call Trace: sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x2e3/0x347 kernel/sched/core.c:5143 print_other_cpu_stall kernel/rcu/tree.c:1501 [inline] check_cpu_stall kernel/rcu/tree.c:1616 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0xd3f/0xdaa kernel/rcu/tree.c:2792 update_process_times+0x29/0x60 kernel/time/timer.c:1590 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:ipv6_get_ifaddr+0x162/0x520 net/ipv6/addrconf.c:1916 RSP: 0018:ffff8880aea07c38 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: 1ffff110128a3a40 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 1ffff110115dc980 RSI: ffffffff86e453c0 RDI: ffff88808aee4c00 RBP: ffff8880aea07d20 R08: 0000000000000000 R09: 0000000000022298 R10: ffff8880a977ccf8 R11: ffff8880a977c400 R12: ffff88809730fa80 R13: ffff8880537200c0 R14: ffffed1015d40fa4 R15: ffff88808aee4680 ndisc_send_rs+0x176/0x630 net/ipv6/ndisc.c:646 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649 __do_softirq+0x254/0x9bf kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15b/0x1a0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:ext4_inode_table+0x0/0x100 fs/ext4/super.c:244 RSP: 0018:ffff8880462bf6e0 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc90008839000 RDX: 0000000000040000 RSI: ffff88821ff78040 RDI: ffff888099c08b80 RBP: ffff888099c08b80 R08: 0000000000000422 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880462bf880 R13: 000000000000009d R14: 0000000000000010 R15: ffffed1008c57f10 recently_deleted fs/ext4/ialloc.c:690 [inline] find_inode_bit.isra.0+0x1a3/0x4e0 fs/ext4/ialloc.c:730 __ext4_new_inode+0x1285/0x4860 fs/ext4/ialloc.c:922 ext4_create+0x1cf/0x4e0 fs/ext4/namei.c:2486 lookup_open+0x10e8/0x1750 fs/namei.c:3241 do_last fs/namei.c:3334 [inline] path_openat+0xfc1/0x3c50 fs/namei.c:3569 do_filp_open+0x18e/0x250 fs/namei.c:3603 do_sys_open+0x29d/0x3f0 fs/open.c:1084 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c4a9 RSP: 002b:00007fd022885c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007fd0228866d4 RCX: 000000000045c4a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000098 R14: 00000000004c2f3b R15: 000000000076bf2c rcu_sched kthread starved for 10433 jiffies! g2928 c2927 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 rcu_sched R running task 29984 9 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746 rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404