[PATCH] Revert "xen: add helpers to allocate unpopulated memory"
Jürgen Groß
jgross at suse.com
Mon Dec 7 05:35:35 UTC 2020
On 06.12.20 18:22, Marek Marczykowski-Górecki wrote:
> This reverts commit 9e2369c06c8a181478039258a4598c1ddd2cadfa.
>
> On a Xen PV dom0, with NVME disk, this makes the dom0 crash when starting
> a domain. This looks like some bad interaction between xen-blkback and
xen-scsiback has the same use pattern.
> NVME driver, both using ZONE_DEVICE. Since the author is on leave now,
> revert the change until proper solution is developed.
>
> The specific crash message is:
>
> general protection fault, probably for non-canonical address 0xdead000000000100: 0000 [#1] SMP NOPTI
> CPU: 1 PID: 134 Comm: kworker/u12:2 Not tainted 5.9.9-1.qubes.x86_64 #1
> Hardware name: LENOVO 20M9CTO1WW/20M9CTO1WW, BIOS N2CET50W (1.33 ) 01/15/2020
> Workqueue: dm-thin do_worker [dm_thin_pool]
> RIP: e030:nvme_map_data+0x300/0x3a0 [nvme]
> Code: b8 fe ff ff e9 a8 fe ff ff 4c 8b 56 68 8b 5e 70 8b 76 74 49 8b 02 48 c1 e8 33 83 e0 07 83 f8 04 0f 85 f2 fe ff ff 49 8b 42 08 <83> b8 d0 00 00 00 04 0f 85 e1 fe ff ff e9 38 fd ff ff 8b 55 70 be
> RSP: e02b:ffffc900010e7ad8 EFLAGS: 00010246
> RAX: dead000000000100 RBX: 0000000000001000 RCX: ffff8881a58f5000
> RDX: 0000000000001000 RSI: 0000000000000000 RDI: ffff8881a679e000
> RBP: ffff8881a5ef4c80 R08: ffff8881a5ef4c80 R09: 0000000000000002
> R10: ffffea0003dfff40 R11: 0000000000000008 R12: ffff8881a679e000
> R13: ffffc900010e7b20 R14: ffff8881a70b5980 R15: ffff8881a679e000
> FS: 0000000000000000(0000) GS:ffff8881b5440000(0000) knlGS:0000000000000000
> CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000001d64408 CR3: 00000001aa2c0000 CR4: 0000000000050660
> Call Trace:
> nvme_queue_rq+0xa7/0x1a0 [nvme]
> __blk_mq_try_issue_directly+0x11d/0x1e0
> ? add_wait_queue_exclusive+0x70/0x70
> blk_mq_try_issue_directly+0x35/0xc0l[
> blk_mq_submit_bio+0x58f/0x660
> __submit_bio_noacct+0x300/0x330
> process_shared_bio+0x126/0x1b0 [dm_thin_pool]
> process_cell+0x226/0x280 [dm_thin_pool]
> process_thin_deferred_cells+0x185/0x320 [dm_thin_pool]
> process_deferred_bios+0xa4/0x2a0 [dm_thin_pool]UX
> do_worker+0xcc/0x130 [dm_thin_pool]
> process_one_work+0x1b4/0x370
> worker_thread+0x4c/0x310
> ? process_one_work+0x370/0x370
> kthread+0x11b/0x140
> ? __kthread_bind_mask+0x60/0x60<
> ret_from_fork+0x22/0x30
> Modules linked in: loop snd_seq_dummy snd_hrtimer nf_tables nfnetlink vfat fat snd_sof_pci snd_sof_intel_byt snd_sof_intel_ipc snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_xtensa_dsp snd_sof_intel_hda snd_sof snd_soc_skl snd_soc_sst_
> ipc snd_soc_sst_dsp snd_hda_ext_core snd_soc_acpi_intel_match snd_soc_acpi snd_soc_core snd_compress ac97_bus snd_pcm_dmaengine elan_i2c snd_hda_codec_hdmi mei_hdcp iTCO_wdt intel_powerclamp intel_pmc_bxt ee1004 intel_rapl_msr iTCO_vendor
> _support joydev pcspkr intel_wmi_thunderbolt wmi_bmof thunderbolt ucsi_acpi idma64 typec_ucsi snd_hda_codec_realtek typec snd_hda_codec_generic snd_hda_intel snd_intel_dspcfg snd_hda_codec thinkpad_acpi snd_hda_core ledtrig_audio int3403_
> thermal snd_hwdep snd_seq snd_seq_device snd_pcm iwlwifi snd_timer processor_thermal_device mei_me cfg80211 intel_rapl_common snd e1000e mei int3400_thermal int340x_thermal_zone i2c_i801 acpi_thermal_rel soundcore intel_soc_dts_iosf i2c_s
> mbus rfkill intel_pch_thermal xenfs
> ip_tables dm_thin_pool dm_persistent_data dm_bio_prison dm_crypt nouveau rtsx_pci_sdmmc mmc_core mxm_wmi crct10dif_pclmul ttm crc32_pclmul crc32c_intel i915 ghash_clmulni_intel i2c_algo_bit serio_raw nvme drm_kms_helper cec xhci_pci nvme
> _core rtsx_pci xhci_pci_renesas drm xhci_hcd wmi video pinctrl_cannonlake pinctrl_intel xen_privcmd xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn uinput
> ---[ end trace f8d47e4aa6724df4 ]---
> RIP: e030:nvme_map_data+0x300/0x3a0 [nvme]
> Code: b8 fe ff ff e9 a8 fe ff ff 4c 8b 56 68 8b 5e 70 8b 76 74 49 8b 02 48 c1 e8 33 83 e0 07 83 f8 04 0f 85 f2 fe ff ff 49 8b 42 08 <83> b8 d0 00 00 00 04 0f 85 e1 fe ff ff e9 38 fd ff ff 8b 55 70 be
> RSP: e02b:ffffc900010e7ad8 EFLAGS: 00010246
> RAX: dead000000000100 RBX: 0000000000001000 RCX: ffff8881a58f5000
> RDX: 0000000000001000 RSI: 0000000000000000 RDI: ffff8881a679e000
> RBP: ffff8881a5ef4c80 R08: ffff8881a5ef4c80 R09: 0000000000000002
> R10: ffffea0003dfff40 R11: 0000000000000008 R12: ffff8881a679e000
> R13: ffffc900010e7b20 R14: ffff8881a70b5980 R15: ffff8881a679e000
> FS: 0000000000000000(0000) GS:ffff8881b5440000(0000) knlGS:0000000000000000
> CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000001d64408 CR3: 00000001aa2c0000 CR4: 0000000000050660
> Kernel panic - not syncing: Fatal exception
> Kernel Offset: disabled
>
> Discussion at https://lore.kernel.org/xen-devel/20201205082839.ts3ju6yta46cgwjn@Air-de-Roger/T
>
> Cc: stable at vger.kernel.org #v5.9+
> (for 5.9 it's easier to revert the original commit directly)
> Signed-off-by: Marek Marczykowski-Górecki <marmarek at invisiblethingslab.com>
Acked-by: Juergen Gross <jgross at suse.com>
Juergen
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