[Xen-users] hvm domU crash on linux 4.14.0 with xen 4.8.2

[Tomas Mozes <hydrapolic@xxxxxxxxx>]

Hello,
after upgrading from Linux 4.4.95 to 4.14.0 we've observed a hvm domU crash with Xen 4.8.2.

[70418.163271] int3: 0000 [#1] SMP
[70418.173003] CPU: 1 PID: 11265 Comm: app Not tainted 4.14.0-gentoo #1
[70418.194535] Hardware name: Xen HVM domU, BIOS 4.8.2 11/14/2017
[70418.205537] task: ffff9b2d943e8dc0 task.stack: ffffa314c1e80000
[70418.217757] RIP: 0010:xen_hypercall_event_channel_op+0xb/0x20
[70418.231311] RSP: 0018:ffff9b2de5843d00 EFLAGS: 00000002
[70418.242846] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
[70418.256365] RDX: 0000000000000000 RSI: ffff9b2de5843d0c RDI: 0000000000000004
[70418.274236] RBP: ffff9b2de5843d10 R08: ffff9b2ddd95ac00 R09: ffff9b2dde403230
[70418.285667] R10: 0000000000000000 R11: 0000000000000040 R12: ffff9b2de58db240
[70418.298853] R13: 0000000000000001 R14: ffff9b2d943e8dc0 R15: ffff9b2de5854168
[70418.311083] FS:  00007f5e8365e700(0000) GS:ffff9b2de5840000(0000) knlGS:0000000000000000
[70418.323074] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[70418.332810] CR2: 00000000023de0e0 CR3: 000000010cad6005 CR4: 00000000001606e0
[70418.435201] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[70418.447396] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[70418.492649] Call Trace:
[70418.498815]  <IRQ>
[70418.503783]  ? notify_remote_via_irq+0x24/0x40
[70418.512792]  xen_send_IPI_one+0x2d/0x70
[70418.521370]  xen_smp_send_reschedule+0xb/0x10
[70418.530176]  trigger_load_balance+0x11e/0x220
[70418.537916]  scheduler_tick+0xa1/0xd0
[70418.545604]  ? tick_sched_do_timer+0x40/0x40
[70418.557234]  update_process_times+0x42/0x50
[70418.565434]  tick_sched_handle+0x34/0x50
[70418.573146]  tick_sched_timer+0x34/0x80
[70418.609000]  __hrtimer_run_queues+0xd1/0x200
[70418.617187]  hrtimer_interrupt+0xac/0x200
[70418.624093]  xen_timer_interrupt+0x1d/0x30
[70418.631425]  __handle_irq_event_percpu+0x79/0x190
[70418.669817]  handle_irq_event_percpu+0x1e/0x50
[70418.678067]  handle_percpu_irq+0x35/0x50
[70418.684258]  generic_handle_irq+0x1d/0x30
[70418.688950]  __evtchn_fifo_handle_events+0x13c/0x150
[70418.696224]  evtchn_fifo_handle_events+0xb/0x10
[70418.702332]  __xen_evtchn_do_upcall+0x3e/0x70
[70418.708984]  xen_evtchn_do_upcall+0x26/0x40
[70418.714106]  xen_hvm_callback_vector+0x93/0xa0
[70418.718635]  </IRQ>
[70418.721253] RIP: 0010:memcpy_erms+0x6/0x10
[70418.725842] RSP: 0018:ffffa314c1e83ac8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff0c
[70418.734146] RAX: ffff9b2cff560010 RBX: ffff9b2d656b9180 RCX: 0000000000018028
[70418.742037] RDX: 0000000000019018 RSI: ffff9b2ddda72fdc RDI: ffff9b2cff561000
[70418.746973] RBP: ffffa314c1e83af0 R08: 000000000001d1e0 R09: 00000000000c2260
[70418.752124] R10: 0000000000000000 R11: 0000000000000002 R12: ffff9b2ddbbae000
[70418.757905] R13: ffffa314c1e83d10 R14: 0000000000019018 R15: fffffffffffffffe
[70418.763805]  ? __d_alloc+0x68/0x1d0
[70418.765764]  d_alloc+0x15/0x80
[70418.767645]  d_alloc_parallel+0x2b/0x470
[70418.770036]  ? __follow_mount_rcu.isra.31+0x3f/0x100
[70418.773607]  ? legitimize_links+0x41/0xb0
[70418.776073]  ? legitimize_path.isra.32+0x29/0x60
[70418.779101]  lookup_slow+0x6e/0x130
[70418.781000]  walk_component+0x1c0/0x310
[70418.783690]  ? trailing_symlink+0x15d/0x240
[70418.786197]  path_lookupat+0x62/0x200
[70418.788575]  filename_lookup+0xa4/0x160
[70418.790906]  ? current_time+0x33/0x70
[70418.792964]  ? getname_flags+0x6d/0x1f0
[70418.795520]  user_path_at_empty+0x31/0x40
[70418.798264]  ? user_path_at_empty+0x31/0x40
[70418.801346]  vfs_statx+0x63/0xb0
[70418.803347]  SYSC_newstat+0x2e/0x50
[70418.805599]  ? __do_page_fault+0x251/0x420
[70418.808063]  ? do_page_fault+0x2e/0xe0
[70418.810253]  SyS_newstat+0x9/0x10
[70418.811886]  entry_SYSCALL_64_fastpath+0x1a/0xa5
[70418.814436] RIP: 0033:0x7f5e82967549
[70418.816711] RSP: 002b:00007ffdb89d9700 EFLAGS: 00000246 ORIG_RAX: 0000000000000004
[70418.820899] RAX: ffffffffffffffda RBX: 00000000023de0d0 RCX: 00007f5e82967549
[70418.824408] RDX: 00007ffdb89d9740 RSI: 00007ffdb89d9740 RDI: 00007ffdb89d97d0
[70418.827934] RBP: 00007f5e82c2aae0 R08: 00007f5e82c27100 R09: 0000000000000024
[70418.832181] R10: 0000000000000073 R11: 0000000000000246 R12: 0000000000000000
[70418.836093] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000
[70418.840216] Code: b8 1f 00 00 00 0f 01 c1 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc b8 20 00 00 00 0f 01 c1 c3 cc cc <cc> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
[70418.855259] RIP: xen_hypercall_event_channel_op+0xb/0x20 RSP: ffff9b2de5843d00
[70418.859524] ---[ end trace 9604f5ac6b837408 ]---
[70418.863837] Kernel panic - not syncing: Fatal exception in interrupt
[70418.872681] Kernel Offset: 0x2c600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

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