------------[ cut here ]------------ WARNING: CPU: 1 PID: 10784 at kernel/kthread.c:83 to_kthread kernel/kthread.c:83 [inline] WARNING: CPU: 1 PID: 10784 at kernel/kthread.c:83 kthread_is_per_cpu+0xc4/0xf0 kernel/kthread.c:519 Modules linked in: CPU: 1 PID: 10784 Comm: syz-executor.2 Not tainted 5.10.45 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:to_kthread kernel/kthread.c:83 [inline] RIP: 0010:kthread_is_per_cpu+0xc4/0xf0 kernel/kthread.c:519 Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 2e 4c 8b 23 41 83 e4 01 e8 79 83 23 00 44 89 e0 5b 5d 41 5c c3 e8 6c 83 23 00 <0f> 0b eb 88 e8 73 a1 4e 00 e9 68 ff ff ff e8 79 a1 4e 00 eb 9a 48 RSP: 0018:ffff88803b926e38 EFLAGS: 00010012 RAX: 0000000000000f26 RBX: ffff88802187cbc0 RCX: ffffc900025fe000 RDX: 0000000000040000 RSI: ffffffff811c0854 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000001 R09: ffff88802187cbc0 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88802187cc68 R13: ffff88803b926fc0 R14: ffff88803b926fc0 R15: ffff88802187cbc0 FS: 00007fb5ec964700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb5ec963108 CR3: 0000000016c42000 CR4: 0000000000350ee0 Call Trace: can_migrate_task+0x90/0xa00 kernel/sched/fair.c:7566 detach_tasks kernel/sched/fair.c:7714 [inline] load_balance+0xa0e/0x2990 kernel/sched/fair.c:9638 newidle_balance+0x6bc/0xed0 kernel/sched/fair.c:10610 pick_next_task_fair+0x48/0xb10 kernel/sched/fair.c:7153 pick_next_task kernel/sched/core.c:4342 [inline] __schedule+0x327/0x1e70 kernel/sched/core.c:4493 schedule+0xcb/0x270 kernel/sched/core.c:4603 schedule_timeout+0x325/0x3f0 kernel/time/timer.c:1847 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion_killable+0x167/0x320 kernel/sched/completion.c:243 call_usermodehelper_exec+0x3b0/0x4c0 kernel/umh.c:438 call_modprobe kernel/kmod.c:98 [inline] __request_module+0x414/0x9b0 kernel/kmod.c:170 ctrl_getfamily+0x1e0/0x5a0 net/netlink/genetlink.c:1046 genl_family_rcv_msg_doit+0x22d/0x330 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x33c/0x5a0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x14b/0x430 net/netlink/af_netlink.c:2496 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1306 [inline] netlink_unicast+0x53a/0x7e0 net/netlink/af_netlink.c:1332 netlink_sendmsg+0x860/0xda0 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x150/0x190 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+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x41956c Code: fa fa ff ff 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 20 fb ff ff 48 8b RSP: 002b:00007fb5ec963020 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fb5ec963110 RCX: 000000000041956c RDX: 0000000000000020 RSI: 00007fb5ec963160 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fb5ec963074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007fb5ec9630c8 R13: 00007fb5ec963160 R14: 0000000000000003 R15: 0000000000000000 irq event stamp: 138 hardirqs last enabled at (137): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (137): [] _raw_spin_unlock_irq+0x1f/0x30 kernel/locking/spinlock.c:199 hardirqs last disabled at (138): [] __schedule+0xeef/0x1e70 kernel/sched/core.c:4425 softirqs last enabled at (118): [] netlink_insert+0x187/0x1620 net/netlink/af_netlink.c:592 softirqs last disabled at (116): [] spin_lock_bh include/linux/spinlock.h:359 [inline] softirqs last disabled at (116): [] release_sock+0x1b/0x1b0 net/core/sock.c:3053 ---[ end trace d9a14c98fe8ec132 ]--- ======================================================