rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): ------------[ cut here ]------------ WARNING: CPU: 0 PID: 20624 at kernel/sched/core.c:3013 rq_unlock kernel/sched/sched.h:1326 [inline] WARNING: CPU: 0 PID: 20624 at kernel/sched/core.c:3013 try_invoke_on_locked_down_task+0x214/0x2c0 kernel/sched/core.c:3019 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 20624 Comm: syz-executor.0 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 panic+0x2e3/0x75c kernel/panic.c:231 __warn.cold+0x20/0x45 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:255 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 RIP: 0010:try_invoke_on_locked_down_task+0x214/0x2c0 kernel/sched/core.c:3013 Code: 45 31 f6 49 39 c0 74 3a 8b 74 24 38 49 8d 78 18 4c 89 04 24 e8 3d 98 08 00 4c 8b 04 24 4c 89 c7 e8 a1 c7 a0 06 e9 29 ff ff ff <0f> 0b e9 86 fe ff ff 4c 89 ee 48 89 ef 41 ff d4 41 89 c6 e9 11 ff RSP: 0018:ffffc90000007bd8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 1ffff92000000f7d RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff81612830 RDI: ffff8881ec39c380 RBP: ffff8881ec39c380 R08: 0000000000000033 R09: ffffffff89bcb543 R10: 0000000000003be5 R11: 0000000000000001 R12: ffffffff81612830 R13: ffffc90000007d00 R14: ffff8881ec39c700 R15: ffff8880ae636c40 rcu_print_task_stall kernel/rcu/tree_stall.h:267 [inline] print_other_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:634 [inline] rcu_pending kernel/rcu/tree.c:3635 [inline] rcu_sched_clock_irq.cold+0x92e/0xccd kernel/rcu/tree.c:2518 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:1520 [inline] __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646 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 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] sysvec_apic_timer_interrupt+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:sctp_bind_addr_state+0xc6/0x1d0 net/sctp/bind_addr.c:402 Code: 89 44 24 08 49 c1 ef 03 49 8d 04 2f 48 89 04 24 e8 bf 77 10 fa 48 8d 7b 3d 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 0f b6 04 28 <38> d0 7f 08 84 c0 0f 85 ba 00 00 00 44 0f b6 7b 3d 31 ff 44 89 fe RSP: 0018:ffffc90018327a48 EFLAGS: 00000206 RAX: 0000000000000000 RBX: ffff88808f725b80 RCX: ffffc90006109000 RDX: 0000000000000005 RSI: ffffffff8763ca41 RDI: ffff88808f725bbd RBP: dffffc0000000000 R08: 0000000000000001 R09: ffff88802712d13b R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90018327ad8 R13: ffff88820c8c6098 R14: ffffffff8a9aa780 R15: 0000000000000000 sctp_copy_local_addr_list+0x217/0x4e0 net/sctp/protocol.c:162 sctp_copy_one_addr net/sctp/bind_addr.c:457 [inline] sctp_bind_addr_copy+0xde/0x460 net/sctp/bind_addr.c:56 sctp_connect_new_asoc+0x1cd/0x770 net/sctp/socket.c:1078 __sctp_connect+0x3e2/0xc00 net/sctp/socket.c:1180 sctp_connect net/sctp/socket.c:4678 [inline] sctp_inet_connect+0x14b/0x1b0 net/sctp/socket.c:4693 __sys_connect_file+0x155/0x1a0 net/socket.c:1853 __sys_connect+0x160/0x190 net/socket.c:1870 __do_sys_connect net/socket.c:1881 [inline] __se_sys_connect net/socket.c:1878 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:1878 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ccd9 Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f314ac98c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00000000000022c0 RCX: 000000000045ccd9 RDX: 000000000000001c RSI: 0000000020000180 RDI: 0000000000000003 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffd827bb93f R14: 00007f314ac999c0 R15: 000000000078bf0c Kernel Offset: disabled Rebooting in 86400 seconds..