rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): ------------[ cut here ]------------ WARNING: CPU: 1 PID: 9663 at kernel/sched/core.c:3013 rq_unlock kernel/sched/sched.h:1326 [inline] WARNING: CPU: 1 PID: 9663 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: 1 PID: 9663 Comm: syz-executor.2 Not tainted 5.9.0-rc3-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+0x198/0x1fd lib/dump_stack.c:118 panic+0x347/0x7c0 kernel/panic.c:231 __warn.cold+0x20/0x46 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254 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 ad 9a 08 00 4c 8b 04 24 4c 89 c7 e8 51 02 a6 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:ffffc90000da8bd8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 1ffff920001b517d RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff81612ed0 RDI: ffff88801b1463c0 RBP: ffff88801b1463c0 R08: 0000000000000033 R09: ffffffff89bcb4a3 R10: 0000000000002db9 R11: 0000000000000001 R12: ffffffff81612ed0 R13: ffffc90000da8d00 R14: ffff88801b146740 R15: ffff8880ae736c00 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:3637 [inline] rcu_sched_clock_irq.cold+0x92e/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 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 7f 5b 0b 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:ffffc9000a2778c0 EFLAGS: 00000206 RAX: 0000000000000000 RBX: ffff8880a723e700 RCX: ffffc9000cedf000 RDX: 0000000000000005 RSI: ffffffff8768ef81 RDI: ffff8880a723e73d RBP: dffffc0000000000 R08: 0000000000000001 R09: ffff888069d8febb R10: 0000000000000000 R11: 0000000000000001 R12: ffffc9000a277950 R13: ffff888030378098 R14: ffffffff8a9ba200 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_sendmsg_new_asoc net/sctp/socket.c:1676 [inline] sctp_sendmsg+0x1377/0x1cf0 net/sctp/socket.c:1986 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 __sys_sendto+0x21c/0x320 net/socket.c:1992 __do_sys_sendto net/socket.c:2004 [inline] __se_sys_sendto net/socket.c:2000 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2000 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 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:00007ff41e756c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000000000002d180 RCX: 000000000045d5b9 RDX: 000000000000003e RSI: 000000002087dffe RDI: 0000000000000004 RBP: 000000000118d178 R08: 000000002005ffe4 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d12c R13: 00007fff75aa07ef R14: 00007ff41e7579c0 R15: 000000000118d12c Shutting down cpus with NMI Kernel Offset: disabled Rebooting in 86400 seconds..