Unluckily this commit breaks hibernation:
0a14dbaa0736 ("video: hyperv_fb: Fix hibernation for the deferred IO feature"):
https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/+git/focal/commit/?h=Ubuntu-azure-5.4.0-1022.22&id=0a14dbaa0736a6021c02e74d42cf3a7ca5438da6
We should include the patch only if the kernel also includes
a4ddb11d297e ("video: hyperv: hyperv_fb: Support deferred IO for Hyper-V frame
buffer driver"
Now I'm seeing a hang/panic issue when hibernating the VM ("5.4.0-1022-azure
#22-Ubuntu"):
[ 67.736061] ------------[ cut here ]------------
[ 67.736068] WARNING: CPU: 5 PID: 1358 at kernel/workqueue.c:3040
__flush_work+0x1b5/0x1d0
[ 67.736068] Modules linked in: xt_owner iptable_security xt_conntrack
nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c bpfilter nls_iso8859_1
dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua sb_edac crct10dif_pclmul
crc32_pclmul ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper
joydev hid_generic hyperv_fb cfbfillrect hid_hyperv intel_rapl_perf serio_raw
hyperv_keyboard pata_acpi hv_netvsc hv_balloon hid cfbimgblt pci_hyperv
cfbcopyarea hv_utils pci_hyperv_intf sch_fq_codel drm
drm_panel_orientation_quirks i2c_core ip_tables x_tables autofs4
[ 67.736088] CPU: 5 PID: 1358 Comm: bash Not tainted 5.4.0-1022-azure
#22-Ubuntu
[ 67.736089] Hardware name: Microsoft Corporation Virtual Machine/Virtual
Machine, BIOS 090007 06/02/2017
[ 67.736091] RIP: 0010:__flush_work+0x1b5/0x1d0
[ 67.736092] Code: f0 eb e3 4d 8b 7c 24 20 e9 f3 fe ff ff 8b 0b 48 8b 53 08
83 e1 08 48 0f ba 2b 03 80 c9 f0 e9 4f ff ff ff 0f 0b e9 68 ff ff ff <0f> 0b 45
31 f6 e9 5e ff ff ff e8 ec e0 fd ff 66 66 2e 0f 1f 84 00
[ 67.736095] RSP: 0018:ffffa7ce8a8ffb78 EFLAGS: 00010246
[ 67.736096] RAX: 0000000000000000 RBX: ffff8be3621f02a0 RCX: 0000000000000000
[ 67.736096] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8be3621f02a0
[ 67.736097] RBP: ffffa7ce8a8ffbf0 R08: 0000000000000000 R09: 00000000ff010101
[ 67.736098] R10: ffff8be363f7a320 R11: 0000000000000001 R12: ffff8be3621f02a0
[ 67.736098] R13: 0000000000000001 R14: 0000000000000001 R15: ffffffffbc390fd1
[ 67.736099] FS: 00007f6df35fe740(0000) GS:ffff8be375d40000(0000)
knlGS:0000000000000000
[ 67.736100] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 67.736100] CR2: 0000561eef2c1b50 CR3: 0000000e40a14004 CR4: 00000000001706e0
[ 67.736102] Call Trace:
[ 67.736108] __cancel_work_timer+0x107/0x180
[ 67.736119] cancel_delayed_work_sync+0x13/0x20
[ 67.736121] hvfb_suspend+0x48/0x80 [hyperv_fb]
[ 67.736122] vmbus_suspend+0x2a/0x40
[ 67.736125] dpm_run_callback+0x5b/0x150
[ 67.736127] __device_suspend_noirq+0x9e/0x2f0
[ 67.736128] dpm_suspend_noirq+0x101/0x2d0
[ 67.736130] dpm_suspend_end+0x53/0x80
[ 67.736132] hibernation_snapshot+0xd8/0x460
[ 67.736133] hibernate.cold+0x6d/0x1f6
[ 67.736135] state_store+0xde/0xe0
[ 67.736138] kobj_attr_store+0x12/0x20
[ 67.736141] sysfs_kf_write+0x3e/0x50
[ 67.736142] kernfs_fop_write+0xda/0x1b0
[ 67.736145] __vfs_write+0x1b/0x40
[ 67.736147] vfs_write+0xb9/0x1a0
[ 67.736149] ksys_write+0x67/0xe0
[ 67.736150] __x64_sys_write+0x1a/0x20
[ 67.736152] do_syscall_64+0x5e/0x200
[ 67.736156] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 67.736157] RIP: 0033:0x7f6df3712057
After I revert 0a14dbaa0736, hibernation works.
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-azure in Ubuntu.
https://bugs.launchpad.net/bugs/1880032
Title:
[linux-azure] Enable Hibernation on The 18.04 and 20.04 5.4 Kernels
Status in linux-azure package in Ubuntu:
Fix Released
Status in linux-azure source package in Focal:
Fix Released
Bug description:
Microsoft would like to request commits to enable VM hibernation in
the Azure 5.4 kernels for 18.04 and 20.04.
Some of the commits needed to enable VM hibernation were included in
mainline 5.4 and older. However, 24 commits were added in 5.5 and
later, which are required in the 5.4 kernel. The list of commits
requested are:
38dce4195f0d x86/hyperv: Properly suspend/resume reenlightenment
notifications
2351f8d295ed PM: hibernate: Freeze kernel threads in software_resume()
421f090c819d x86/hyperv: Suspend/resume the VP assist page for hibernation
1a06d017fb3f Drivers: hv: vmbus: Fix Suspend-to-Idle for Generation-2 VM
3704a6a44579 PM: hibernate: Propagate the return value of
hibernation_restore()
54e19d34011f hv_utils: Add the support of hibernation
ffd1d4a49336 hv_utils: Support host-initiated hibernation request
3e9c72056ed5 hv_utils: Support host-initiated restart request
9fc3c01a1fae6 Tools: hv: Reopen the devices if read() or write() returns
05bd330a7fd8 x86/hyperv: Suspend/resume the hypercall page for hibernation
382a46221757 video: hyperv_fb: Fix hibernation for the deferred IO feature
e2379b30324c Input: hyperv-keyboard: Add the support of hibernation
ac82fc8327088 PCI: hv: Add hibernation support
a8e37506e79a PCI: hv: Reorganize the code in preparation of hibernation
1349401ff1aa4 clocksource/drivers/hyper-v: Suspend/resume Hyper-V clocksource
for hibernation
af13f9ed6f9a HID: hyperv: Add the support of hibernation
25bd2b2f1f053 hv_balloon: Add the support of hibernation
b96f86534fa31 x86/hyperv: Implement hv_is_hibernation_supported()
4df4cb9e99f83 x86/hyperv: Initialize clockevents earlier in CPU onlining
0efeea5fb1535 hv_netvsc: Add the support of hibernation
2194c2eb6717f hv_sock: Add the support of hibernation
1ecf302021040 video: hyperv_fb: Add the support of hibernation
56fb105859345 scsi: storvsc: Add the support of hibernation
f2c33ccacb2d4 PCI/PM: Always return devices to D0 when thawing
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https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1880032/+subscriptions
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