https://bugzilla.kernel.org/show_bug.cgi?id=197861 Bug ID: 197861 Summary: Shutting down a VM with Kernel 4.14 will sometime hang and a reboot is the only way to recover. Product: Virtualization Version: unspecified Kernel Version: 4.14-rc8 Hardware: Intel OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: kvm Assignee: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx Reporter: hilld@xxxxxxxxxxxxxxx Regression: No [ 7496.552971] INFO: task qemu-system-x86:5978 blocked for more than 120 seconds. [ 7496.552987] Tainted: G I 4.14.0-0.rc1.git3.1.fc28.x86_64 #1 [ 7496.552996] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 7496.553006] qemu-system-x86 D12240 5978 1 0x00000004 [ 7496.553024] Call Trace: [ 7496.553044] __schedule+0x2dc/0xbb0 [ 7496.553055] ? trace_hardirqs_on+0xd/0x10 [ 7496.553074] schedule+0x3d/0x90 [ 7496.553087] vhost_net_ubuf_put_and_wait+0x73/0xa0 [vhost_net] [ 7496.553100] ? finish_wait+0x90/0x90 [ 7496.553115] vhost_net_ioctl+0x542/0x910 [vhost_net] [ 7496.553144] do_vfs_ioctl+0xa6/0x6c0 [ 7496.553166] SyS_ioctl+0x79/0x90 [ 7496.553182] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 7496.553190] RIP: 0033:0x7fa1ea0e1817 [ 7496.553196] RSP: 002b:00007ffe3d854bc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 7496.553209] RAX: ffffffffffffffda RBX: 000000000000001d RCX: 00007fa1ea0e1817 [ 7496.553215] RDX: 00007ffe3d854bd0 RSI: 000000004008af30 RDI: 0000000000000021 [ 7496.553222] RBP: 000055e33352b610 R08: 000055e33024a6f0 R09: 000055e330245d92 [ 7496.553228] R10: 000055e33344e7f0 R11: 0000000000000246 R12: 000055e33351a000 [ 7496.553235] R13: 0000000000000001 R14: 0000000400000000 R15: 0000000000000000 [ 7496.553284] Showing all locks held in the system: [ 7496.553313] 1 lock held by khungtaskd/161: [ 7496.553319] #0: (tasklist_lock){.+.+}, at: [<ffffffff8111740d>] debug_show_all_locks+0x3d/0x1a0 [ 7496.553373] 1 lock held by in:imklog/1194: [ 7496.553379] #0: (&f->f_pos_lock){+.+.}, at: [<ffffffff8130ecfc>] __fdget_pos+0x4c/0x60 [ 7496.553541] 1 lock held by qemu-system-x86/5978: [ 7496.553547] #0: (&dev->mutex#3){+.+.}, at: [<ffffffffc077e498>] vhost_net_ioctl+0x358/0x910 [vhost_net] I'm currently bisecting to figure out which commit breaks this but for some reasons, when hitting this commit: # bad: [46d4b68f891bee5d83a32508bfbd9778be6b1b63] Merge tag 'wireless-drivers-next-for-davem-2017-08-07' of git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next git bisect bad 46d4b68f891bee5d83a32508bfbd9778be6b1b63 the host will not allow SSHd to establish a new session and when starting a KVM guest, the host will hard lock. I'm still bisecting but I marked that commit as bad even though perhaps it would be good. -- You are receiving this mail because: You are watching the assignee of the bug.
