INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=10062, c=10061, q=6) All QSes seen, last rcu_sched kthread activity 10412 (4295005737-4294995325), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.2 R running task 27040 19752 7449 0x00000008 Call Trace: sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x2f0/0x351 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+0xcb1/0xd0a kernel/rcu/tree.c:2792 update_process_times+0x31/0x70 kernel/time/timer.c:1590 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:165 tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:sctp_auth_send_cid+0x3e/0x140 net/sctp/auth.c:677 RSP: 0018:ffff8880aec07880 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffff8880560ee940 RCX: ffff888211c72f00 RDX: 1ffff1100ac1dd3f RSI: ffff8880560ee940 RDI: ffff8880560ee9f8 RBP: ffff8880aec07898 R08: ffff8880711772c4 R09: 0000000000000005 R10: 0000000000000000 R11: ffff888211c72680 R12: 0000000000000004 R13: ffff8880a95e3a80 R14: ffff888056a34a40 R15: ffff88808bf25800 _sctp_make_chunk+0x1b4/0x270 net/sctp/sm_make_chunk.c:1409 sctp_make_control+0x35/0x150 net/sctp/sm_make_chunk.c:1429 sctp_make_heartbeat+0x88/0x250 net/sctp/sm_make_chunk.c:1148 sctp_sf_heartbeat.isra.0+0x26/0x180 net/sctp/sm_statefuns.c:971 sctp_sf_sendbeat_8_3+0x36f/0x520 net/sctp/sm_statefuns.c:1015 sctp_do_sm+0x108/0x50d0 net/sctp/sm_sideeffect.c:1147 sctp_generate_heartbeat_event+0x1dd/0x400 net/sctp/sm_sideeffect.c:391 call_timer_fn+0x161/0x670 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+0x5b7/0x1520 kernel/time/timer.c:1649 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x160/0x1b0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x1ea/0x430 kernel/locking/lockdep.c:3997 RSP: 0018:ffff888211c7f688 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fe2cc9 RBX: ffff888211c72680 RCX: 00000000509febee RDX: dffffc0000000000 RSI: ffff888211c72f50 RDI: 0000000000000282 RBP: ffff888211c7f6d0 R08: 0000000000004343 R09: ffffffff89570298 R10: ffff888211c72f50 R11: ffff888211c72680 R12: ffff8880a6f91d88 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 down_read+0x3b/0xb0 kernel/locking/rwsem.c:24 __ext4_new_inode+0x16e4/0x4860 fs/ext4/ialloc.c:1038 ext4_create+0x1da/0x4f0 fs/ext4/namei.c:2478 lookup_open+0x11a6/0x1860 fs/namei.c:3241 do_last fs/namei.c:3334 [inline] path_openat+0x1028/0x3e50 fs/namei.c:3569 do_filp_open+0x18e/0x250 fs/namei.c:3603 do_sys_open+0x2c5/0x430 fs/open.c:1084 SYSC_open fs/open.c:1102 [inline] SyS_open fs/open.c:1097 [inline] SYSC_creat fs/open.c:1142 [inline] SyS_creat+0x27/0x30 fs/open.c:1140 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c449 RSP: 002b:00007f6ce3012c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f6ce30136d4 RCX: 000000000045c449 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000380 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000098 R14: 00000000004c2ecf R15: 000000000076bf2c