------------[ cut here ]------------ sched: Unexpected reschedule of offline CPU#3! WARNING: arch/x86/kernel/apic/ipi.c:71 at native_smp_send_reschedule+0x4d/0x60 arch/x86/kernel/apic/ipi.c:71, CPU#2: kworker/u32:4/5842 Modules linked in: CPU: 2 UID: 0 PID: 5842 Comm: kworker/u32:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: netns cleanup_net RIP: 0010:native_smp_send_reschedule+0x4f/0x60 arch/x86/kernel/apic/ipi.c:71 Code: b0 c6 00 48 0f a3 2d a8 86 8e 0f 73 14 89 df be fd 00 00 00 5b 5d e9 a0 2a 01 00 90 0f 0b 90 eb c7 48 8d 3d 63 3f 91 0f 89 de <67> 48 0f b9 3a 5b 5d e9 05 b6 19 0a 0f 1f 44 00 00 90 90 90 90 90 RSP: 0018:ffffc9000617ee40 EFLAGS: 00010046 RAX: 0000000000000001 RBX: 0000000000000003 RCX: ffffffff81b69fa8 RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffffffff9147df30 RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff228a4cb R10: ffffffff9145265f R11: 0000000000000003 R12: 0000000000000004 R13: 1ffff92000c2fdcc R14: ffffc9000617ee80 R15: 0000000000000010 FS: 0000000000000000(0000) GS:ffff888096b67000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055a33142b090 CR3: 000000000eb96000 CR4: 0000000000350ef0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: arch_smp_send_reschedule arch/x86/include/asm/smp.h:90 [inline] __resched_curr+0x2db/0x500 kernel/sched/core.c:1225 wakeup_preempt+0xd0/0x400 kernel/sched/core.c:2301 ttwu_do_activate+0x1ad/0x800 kernel/sched/core.c:3835 ttwu_queue kernel/sched/core.c:4087 [inline] try_to_wake_up+0xcf0/0x1c90 kernel/sched/core.c:4425 cpu_stop_queue_work+0x271/0x340 kernel/stop_machine.c:108 stop_one_cpu_nowait+0xe8/0x160 kernel/stop_machine.c:387 sched_balance_rq+0x317c/0x48b0 kernel/sched/fair.c:13661 sched_balance_newidle kernel/sched/fair.c:14627 [inline] pick_task_fair+0xb6b/0x1e00 kernel/sched/fair.c:10073 __pick_next_task+0x105/0x710 kernel/sched/core.c:6159 pick_next_task kernel/sched/core.c:6257 [inline] __schedule+0x57f/0x6920 kernel/sched/core.c:7185 __schedule_loop kernel/sched/core.c:7347 [inline] schedule+0xdd/0x2c0 kernel/sched/core.c:7362 schedule_timeout+0x1b2/0x280 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common+0x2e7/0x4c0 kernel/sched/completion.c:121 kthread_stop+0x18e/0x630 kernel/kthread.c:760 rxrpc_unuse_local+0x107/0x140 net/rxrpc/local_object.c:409 rxrpc_release_sock net/rxrpc/af_rxrpc.c:967 [inline] rxrpc_release+0x384/0x6a0 net/rxrpc/af_rxrpc.c:994 __sock_release net/socket.c:735 [inline] sock_release+0x91/0x1c0 net/socket.c:763 afs_close_socket+0x24b/0x410 fs/afs/rxrpc.c:154 afs_net_exit+0x93/0x150 fs/afs/main.c:149 ops_exit_list net/core/net_namespace.c:200 [inline] ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:253 cleanup_net+0x499/0x920 net/core/net_namespace.c:706 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387 process_scheduled_works kernel/workqueue.c:3470 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: b0 c6 mov $0xc6,%al 2: 00 48 0f add %cl,0xf(%rax) 5: a3 2d a8 86 8e 0f 73 movabs %eax,0x8914730f8e86a82d c: 14 89 e: df be fd 00 00 00 fistpll 0xfd(%rsi) 14: 5b pop %rbx 15: 5d pop %rbp 16: e9 a0 2a 01 00 jmp 0x12abb 1b: 90 nop 1c: 0f 0b ud2 1e: 90 nop 1f: eb c7 jmp 0xffffffe8 21: 48 8d 3d 63 3f 91 0f lea 0xf913f63(%rip),%rdi # 0xf913f8b 28: 89 de mov %ebx,%esi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 5b pop %rbx 30: 5d pop %rbp 31: e9 05 b6 19 0a jmp 0xa19b63b 36: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop