watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syzkaller040604:3007] Modules linked in: irq event stamp: 5000742 hardirqs last enabled at (5000741): [] restore_regs_and_iret+0x0/0x1d hardirqs last disabled at (5000742): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:702 softirqs last enabled at (5000550): [] __do_softirq+0x7ba/0xba3 kernel/softirq.c:310 softirqs last disabled at (5000539): [] invoke_softirq kernel/softirq.c:364 [inline] softirqs last disabled at (5000539): [] irq_exit+0x1cc/0x200 kernel/softirq.c:405 CPU: 1 PID: 3007 Comm: syzkaller040604 Not tainted 4.13.0-rc5+ #41 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d14e0040 task.stack: ffff8801cf340000 RIP: 0010:genl_family_attrbuf+0x69/0xf0 net/netlink/genetlink.c:1072 RSP: 0018:ffff8801cf346d90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffffffff8580abc0 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffff8801cf346f78 RDI: ffffffff85cbd600 RBP: ffff8801cf346d98 R08: 0000000000000001 R09: 1ffff10039e68d52 R10: ffffffff84c10898 R11: 0000000000000002 R12: ffff8801cf346f78 R13: 000000000000000a R14: 0000000000000000 R15: ffffffff86067500 FS: 0000000001bcf880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020fdb000 CR3: 00000001d0da1000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tipc_nlmsg_parse+0x29/0xe0 net/tipc/netlink.c:267 tipc_nl_publ_dump+0x7f4/0xef0 net/tipc/socket.c:2864 __tipc_nl_compat_dumpit.isra.10+0x20c/0xa10 net/tipc/netlink_compat.c:192 tipc_nl_compat_publ_dump net/tipc/netlink_compat.c:914 [inline] tipc_nl_compat_sk_dump+0x834/0xbb0 net/tipc/netlink_compat.c:962 __tipc_nl_compat_dumpit.isra.10+0x30d/0xa10 net/tipc/netlink_compat.c:201 tipc_nl_compat_dumpit+0x1d2/0x3c0 net/tipc/netlink_compat.c:264 tipc_nl_compat_handle net/tipc/netlink_compat.c:1136 [inline] tipc_nl_compat_recv+0x419/0x18f0 net/tipc/netlink_compat.c:1199 genl_family_rcv_msg+0x7b7/0xfb0 net/netlink/genetlink.c:598 genl_rcv_msg+0xb2/0x140 net/netlink/genetlink.c:623 netlink_rcv_skb+0x216/0x440 net/netlink/af_netlink.c:2397 genl_rcv+0x28/0x40 net/netlink/genetlink.c:634 netlink_unicast_kernel net/netlink/af_netlink.c:1265 [inline] netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1291 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1854 sock_sendmsg_nosec net/socket.c:633 [inline] sock_sendmsg+0xca/0x110 net/socket.c:643 sock_write_iter+0x31a/0x5d0 net/socket.c:898 call_write_iter include/linux/fs.h:1743 [inline] new_sync_write fs/read_write.c:457 [inline] __vfs_write+0x684/0x970 fs/read_write.c:470 vfs_write+0x189/0x510 fs/read_write.c:518 SYSC_write fs/read_write.c:565 [inline] SyS_write+0xef/0x220 fs/read_write.c:557 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x4403c9 RSP: 002b:00007ffd914e31b8 EFLAGS: 00000207 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00000000004403c9 RDX: 0000000000000022 RSI: 0000000020fdb000 RDI: 0000000000000006 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000401930 R13: 00000000004019c0 R14: 0000000000000000 R15: 0000000000000000 Code: 86 00 00 00 e8 79 da 76 fd 48 c7 c7 00 d6 cb 85 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 <83> c0 03 38 d0 7c 04 84 d2 75 67 8b 05 76 b5 d4 01 85 c0 75 27