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    Subject5.3-rc3: Frozen graphics with kcompactd migrating i915 pages
    Date
    This happened to me today, running kernel 5.3.0-rc3-1.g571863b-default
    (5.3-rc3 with just a few patches on top), after starting a KVM virtual
    machine. The X screen was frozen. Remote login via ssh was still
    possible, thus I was able to retrieve basic logs.

    sysrq-w showed two blocked processes (kcompactd0 and KVM). After a
    minute, the same two processes were still blocked. KVM seems to try to
    acquire a lock that kcompactd is holding. kcompactd is waiting for IO
    to complete on pages owned by the i915 driver.

    kcompactd stack:

    Aug 09 12:12:48 apollon.suse.de kernel: sysrq: Show Blocked State
    Aug 09 12:12:48 apollon.suse.de
    kernel: task PC stack pid father
    Aug 09 12:12:48 apollon.suse.de kernel:
    kcompactd0 D 0 43 2 0x80004000
    Aug 09 12:12:48 apollon.suse.de kernel: Call Trace:
    Aug 09 12:12:48 apollon.suse.de kernel: ? __schedule+0x2af/0x6a0
    Aug 09 12:12:48 apollon.suse.de kernel: schedule+0x33/0x90
    Aug 09 12:12:48 apollon.suse.de kernel: io_schedule+0x12/0x40
    Aug 09 12:12:48 apollon.suse.de kernel: __lock_page+0x123/0x200
    Aug 09 12:12:48 apollon.suse.de kernel: ?
    gen8_ppgtt_clear_pdp+0xc0/0x140 [i915]
    Aug 09 12:12:48 apollon.suse.de kernel: ?
    file_fdatawait_range+0x20/0x20
    Aug 09 12:12:48 apollon.suse.de kernel: set_page_dirty_lock+0x49/0x50
    Aug 09 12:12:48 apollon.suse.de
    kernel: i915_gem_userptr_put_pages+0x13f/0x1c0 [i915]
    Aug 09 12:12:48 apollon.suse.de
    kernel: __i915_gem_object_put_pages+0x5e/0xa0 [i915]
    Aug 09 12:12:48 apollon.suse.de
    kernel: userptr_mn_invalidate_range_start+0x1ff/0x220 [i915]
    Aug 09 12:12:48 apollon.suse.de
    kernel: __mmu_notifier_invalidate_range_start+0x57/0xa0
    Aug 09 12:12:48 apollon.suse.de kernel: try_to_unmap_one+0xa0b/0xae0
    Aug 09 12:12:48 apollon.suse.de kernel: ? __mod_lruvec_state+0x3f/0xf0
    Aug 09 12:12:48 apollon.suse.de kernel: rmap_walk_file+0xf2/0x250
    Aug 09 12:12:48 apollon.suse.de kernel: try_to_unmap+0xa6/0xe0
    Aug 09 12:12:48 apollon.suse.de kernel: ? page_remove_rmap+0x290/0x290
    Aug 09 12:12:48 apollon.suse.de kernel: ? page_not_mapped+0x20/0x20
    Aug 09 12:12:48 apollon.suse.de kernel: ? page_get_anon_vma+0x80/0x80
    Aug 09 12:12:48 apollon.suse.de kernel: migrate_pages+0x8cd/0xbc0
    Aug 09 12:12:48 apollon.suse.de kernel: ?
    fast_isolate_freepages+0x6b0/0x6b0
    Aug 09 12:12:48 apollon.suse.de kernel: ? move_freelist_tail+0xb0/0xb0
    Aug 09 12:12:48 apollon.suse.de kernel: compact_zone+0x669/0xc80
    Aug 09 12:12:48 apollon.suse.de kernel: ?
    entry_SYSCALL_64_after_hwframe+0xb8/0xbe
    Aug 09 12:12:48 apollon.suse.de kernel: kcompactd_do_work+0x120/0x290


    KVM stack:

    Aug 09 12:12:48 apollon.suse.de kernel: CPU 0/KVM D 0
    25189 1 0x00000320
    Aug 09 12:12:48 apollon.suse.de kernel: Call Trace:
    Aug 09 12:12:48 apollon.suse.de kernel: ? __schedule+0x2af/0x6a0
    Aug 09 12:12:48 apollon.suse.de kernel: schedule+0x33/0x90
    Aug 09 12:12:48 apollon.suse.de
    kernel: schedule_preempt_disabled+0xa/0x10
    Aug 09 12:12:48 apollon.suse.de
    kernel: __mutex_lock.isra.0+0x172/0x4d0
    Aug 09 12:12:48 apollon.suse.de
    kernel: userptr_mn_invalidate_range_start+0x1bf/0x220 [i915]
    Aug 09 12:12:48 apollon.suse.de
    kernel: __mmu_notifier_invalidate_range_start+0x57/0xa0
    Aug 09 12:12:48 apollon.suse.de kernel: try_to_unmap_one+0xa0b/0xae0
    Aug 09 12:12:48 apollon.suse.de kernel: rmap_walk_file+0xf2/0x250
    Aug 09 12:12:48 apollon.suse.de kernel: try_to_unmap+0xa6/0xe0
    Aug 09 12:12:48 apollon.suse.de kernel: ? page_remove_rmap+0x290/0x290
    Aug 09 12:12:48 apollon.suse.de kernel: ? page_not_mapped+0x20/0x20
    Aug 09 12:12:48 apollon.suse.de kernel: ? page_get_anon_vma+0x80/0x80
    Aug 09 12:12:48 apollon.suse.de kernel: migrate_pages+0x8cd/0xbc0
    Aug 09 12:12:48 apollon.suse.de kernel: ?
    fast_isolate_freepages+0x6b0/0x6b0
    Aug 09 12:12:48 apollon.suse.de kernel: ? move_freelist_tail+0xb0/0xb0
    Aug 09 12:12:48 apollon.suse.de kernel: compact_zone+0x669/0xc80
    Aug 09 12:12:48 apollon.suse.de kernel: compact_zone_order+0xc6/0xf0
    Aug 09 12:12:48 apollon.suse.de
    kernel: try_to_compact_pages+0xcc/0x2a0
    Aug 09 12:12:48 apollon.suse.de
    kernel: __alloc_pages_direct_compact+0x7c/0x150
    Aug 09 12:12:48 apollon.suse.de
    kernel: __alloc_pages_slowpath+0x1ee/0xd00
    Aug 09 12:12:48 apollon.suse.de kernel: ? vmx_vcpu_load+0x100/0x120
    [kvm_intel]

    Full logs can be found under https://pastebin.com/KJ6tccj4
    I haven't yet tried if this is reproducible.

    Regards
    Martin

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