Messages in this thread | | | Subject | Re: [PATCH] fanotify: allow freeze on suspend when waiting for response from userspace | From | Orion Poplawski <> | Date | Sat, 29 Dec 2018 15:34:41 -0700 |
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On 12/29/18 3:04 PM, Orion Poplawski wrote: >> On Thu 22-02-18 15:14:54, Kunal Shubham wrote: >>> >> On Fri 16-02-18 15:14:40, t.vivek@samsung.com wrote: >>> >> From: Vivek Trivedi <t.vivek@samsung.com> >>> >> >> If fanotify userspace response server thread is frozen first, >>> >> it may fail to send response from userspace to kernel space listener. >>> >> In this scenario, fanotify response listener will never get response >>> >> from userepace and fail to suspend. >>> >> >> Use freeze-friendly wait API to handle this issue. >>> >> >> Same problem was reported here: >>> >> https://bbs.archlinux.org/viewtopic.php?id=232270 >>> >> >> Freezing of tasks failed after 20.005 seconds >>> >> (1 tasks refusing to freeze, wq_busy=0) >>> >> >> Backtrace: >>> >> [<c0582f80>] (__schedule) from [<c05835d0>] (schedule+0x4c/0xa4) >>> >> [<c0583584>] (schedule) from [<c01cb648>] >>> (fanotify_handle_event+0x1c8/0x218) >>> >> [<c01cb480>] (fanotify_handle_event) from [<c01c8238>] >>> (fsnotify+0x17c/0x38c) >>> >> [<c01c80bc>] (fsnotify) from [<c02676dc>] >>> (security_file_open+0x88/0x8c) >>> >> [<c0267654>] (security_file_open) from [<c01854b0>] >>> (do_dentry_open+0xc0/0x338) >>> >> [<c01853f0>] (do_dentry_open) from [<c0185a38>] (vfs_open+0x54/0x58) >>> >> [<c01859e4>] (vfs_open) from [<c0195480>] >>> (do_last.isra.10+0x45c/0xcf8) >>> >> [<c0195024>] (do_last.isra.10) from [<c0196140>] >>> (path_openat+0x424/0x600) >>> >> [<c0195d1c>] (path_openat) from [<c0197498>] (do_filp_open+0x3c/0x98) >>> >> [<c019745c>] (do_filp_open) from [<c0186b44>] >>> (do_sys_open+0x120/0x1e4) >>> >> [<c0186a24>] (do_sys_open) from [<c0186c30>] (SyS_open+0x28/0x2c) >>> >> [<c0186c08>] (SyS_open) from [<c0010200>] >>> (__sys_trace_return+0x0/0x20) >>> > >>> > Yeah, good catch. >>> > >>> >> @@ -63,7 +64,9 @@ static int fanotify_get_response(struct >>> fsnotify_group *group, >>> >> >> pr_debug("%s: group=%p event=%p\n", __func__, group, event); >>> >> >> - wait_event(group->fanotify_data.access_waitq, >>> event->response); >>> >> + while (!event->response) >>> >> + wait_event_freezable(group->fanotify_data.access_waitq, >>> >> + event->response); >>> > >>> > But if the process gets a signal while waiting, we will just >>> livelock the >>> > kernel in this loop as wait_event_freezable() will keep returning >>> > ERESTARTSYS. So you need to be a bit more clever here... >>> >>> Hi Jack, >>> Thanks for the quick review. >>> To avoid livelock issue, is it fine to use below change? If agree, I >>> will send v2 patch. >>> >>> @@ -63,7 +64,11 @@ static int fanotify_get_response(struct >>> fsnotify_group *group, >>> >>> pr_debug("%s: group=%p event=%p\n", __func__, group, event); >>> >>> - wait_event(group->fanotify_data.access_waitq, event->response); >>> + while (!event->response) { >>> + if >>> (wait_event_freezable(group->fanotify_data.access_waitq, >>> + event->response)) >>> + flush_signals(current); >>> + } >> >> Hum, I don't think this is correct either as this way if any signal was >> delivered while waiting for fanotify response, we'd just lose it while >> previously it has been properly handled. So what I think needs to be done >> is that we just use wait_event_freezable() and propagate non-zero return >> value (-ERESTARTSYS) up to the caller to handle the signal and restart >> the >> syscall as necessary. >> >> Honza >> -- >> Jan Kara <jack@suse.com> >> SUSE Labs, CR > > Is there any progress here? This has become a real pain for us while > running BitDefender on EL7 laptops. I tried applying the following to > the EL7 kernel: > > diff -up > linux-3.10.0-957.1.3.el7.x86_64/fs/notify/fanotify/fanotify.c.orig > kernel-3.10.0-957.1.3.el7/linux-3.10.0-957.1.3.el7.x86_64/fs/notify/fanotify/fanotify.c > > --- linux-3.10.0-957.1.3.el7.x86_64/fs/notify/fanotify/fanotify.c.orig > 2018-11-15 10:07:13.000000000 -0700 > +++ linux-3.10.0-957.1.3.el7.x86_64/fs/notify/fanotify/fanotify.c > 2018-12-28 15:44:26.452895337 -0700 > @@ -9,6 +9,7 @@ > #include <linux/types.h> > #include <linux/wait.h> > #include <linux/audit.h> > +#include <linux/freezer.h> > > #include "fanotify.h" > > @@ -64,7 +65,12 @@ static int fanotify_get_response(struct > > pr_debug("%s: group=%p event=%p\n", __func__, group, event); > > - wait_event(group->fanotify_data.access_waitq, event->response); > + while (!event->response) { > + ret = > wait_event_freezable(group->fanotify_data.access_waitq, > + event->response); > + if (ret < 0) > + return ret; > + } > > /* userspace responded, convert to something usable */ > switch (event->response & ~FAN_AUDIT) { > > but I get a kernel panic shortly after logging in to the system. >
Here is the panic:
[ 324.774862] ------------[ cut here ]------------ [ 324.774872] WARNING: CPU: 1 PID: 18685 at fs/notify/notification.c:84 fsnotify_destroy_event+0x6b/0x70 [ 324.774874] Modules linked in: cmac ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 tun bridge stp llc devlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep hid_multitouch iTCO_wdt iTCO_vendor_support intel_wmi_thunderbolt dell_wmi arc4 iwlmvm intel_pmc_core intel_powerclamp coretemp intel_rapl mac80211 kvm_intel vfat fat dell_laptop kvm snd_hda_codec_hdmi dell_smbios dell_wmi_descriptor dcdbas dell_led irqbypass snd_hda_codec_realtek snd_soc_skl snd_hda_codec_generic snd_soc_skl_ipc snd_hda_ext_core snd_soc_sst_dsp iwlwifi snd_soc_sst_ipc snd_soc_acpi snd_soc_core snd_compress snd_hda_intel snd_hda_codec joydev snd_hda_core snd_hwdep snd_seq [ 324.774918] snd_seq_device pcspkr snd_pcm rtsx_pci_ms memstick uvcvideo cfg80211 videobuf2_vmalloc snd_timer videobuf2_memops videobuf2_core snd videodev soundcore i2c_i801 btusb btrtl btbcm btintel bluetooth rfkill idma64 virt_dma i2c_designware_platform i2c_designware_core wmi pinctrl_sunrisepoint pinctrl_intel intel_hid sparse_keymap int3400_thermal acpi_pad mei_me mei binfmt_misc auth_rpcgss sunrpc ip_tables xfs libcrc32c dm_crypt drbg ansi_cprng rtsx_pci_sdmmc mmc_core crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel i915 ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd serio_raw nvme nvme_core rtsx_pci i2c_hid i2c_algo_bit iosf_mbi drm_kms_helper video ahci syscopyarea sysfillrect sysimgblt fb_sys_fops libahci drm libata drm_panel_orientation_quirks dm_mirror [ 324.774964] dm_region_hash dm_log dm_mod [ 324.774968] CPU: 1 PID: 18685 Comm: gnome-session-f Kdump: loaded Not tainted 3.10.0-957.1.3.el7.fanotify.x86_64 #1 [ 324.774970] Hardware name: Dell Inc. XPS 13 9350/0YT4WT, BIOS 1.7.0 01/16/2018 [ 324.774972] Call Trace: [ 324.774978] [<ffffffffa8961e41>] dump_stack+0x19/0x1b [ 324.774982] [<ffffffffa8297648>] __warn+0xd8/0x100 [ 324.774986] [<ffffffffa829778d>] warn_slowpath_null+0x1d/0x20 [ 324.774989] [<ffffffffa84892bb>] fsnotify_destroy_event+0x6b/0x70 [ 324.774992] [<ffffffffa848c7a9>] fanotify_handle_event+0x279/0x410 [ 324.774996] [<ffffffffa82c2d00>] ? wake_up_atomic_t+0x30/0x30 [ 324.774999] [<ffffffffa8488c27>] fsnotify+0x2d7/0x510 [ 324.775003] [<ffffffffa84f940e>] security_file_open+0x6e/0x70 [ 324.775007] [<ffffffffa843e9d9>] do_dentry_open+0xb9/0x2e0 [ 324.775010] [<ffffffffa84f8e62>] ? security_inode_permission+0x22/0x30 [ 324.775013] [<ffffffffa843ec9a>] vfs_open+0x5a/0xb0 [ 324.775016] [<ffffffffa844d1a8>] ? may_open+0x68/0x120 [ 324.775018] [<ffffffffa844f7ad>] do_last+0x1ed/0x12a0 [ 324.775043] [<ffffffffc06f387c>] ? xfs_iunlock+0xac/0x130 [xfs] [ 324.775046] [<ffffffffa84529d2>] path_openat+0x442/0x640 [ 324.775050] [<ffffffffa845406d>] do_filp_open+0x4d/0xb0 [ 324.775053] [<ffffffffa84616f7>] ? __alloc_fd+0x47/0x170 [ 324.775057] [<ffffffffa8440197>] do_sys_open+0x137/0x240 [ 324.775060] [<ffffffffa84402be>] SyS_open+0x1e/0x20 [ 324.775064] [<ffffffffa8974ddb>] system_call_fastpath+0x22/0x27 [ 324.775067] ---[ end trace e834a395da6ce84e ]--- [ 324.775225] ------------[ cut here ]------------ [ 324.775231] WARNING: CPU: 1 PID: 17759 at lib/list_debug.c:33 __list_add+0xac/0xc0 [ 324.775234] list_add corruption. prev->next should be next (ffff8a8d72d5f9a8), but was ffff8a8d36b7a280. (prev=ffff8a8d36b7a380). [ 324.775236] Modules linked in: cmac ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 tun bridge stp llc devlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep hid_multitouch iTCO_wdt iTCO_vendor_support intel_wmi_thunderbolt dell_wmi arc4 iwlmvm intel_pmc_core intel_powerclamp coretemp intel_rapl mac80211 kvm_intel vfat fat dell_laptop kvm snd_hda_codec_hdmi dell_smbios dell_wmi_descriptor dcdbas dell_led irqbypass snd_hda_codec_realtek snd_soc_skl snd_hda_codec_generic snd_soc_skl_ipc snd_hda_ext_core snd_soc_sst_dsp iwlwifi snd_soc_sst_ipc snd_soc_acpi snd_soc_core snd_compress snd_hda_intel snd_hda_codec joydev snd_hda_core snd_hwdep snd_seq [ 324.775281] snd_seq_device pcspkr snd_pcm rtsx_pci_ms memstick uvcvideo cfg80211 videobuf2_vmalloc snd_timer videobuf2_memops videobuf2_core snd videodev soundcore i2c_i801 btusb btrtl btbcm btintel bluetooth rfkill idma64 virt_dma i2c_designware_platform i2c_designware_core wmi pinctrl_sunrisepoint pinctrl_intel intel_hid sparse_keymap int3400_thermal acpi_pad mei_me mei binfmt_misc auth_rpcgss sunrpc ip_tables xfs libcrc32c dm_crypt drbg ansi_cprng rtsx_pci_sdmmc mmc_core crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel i915 ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd serio_raw nvme nvme_core rtsx_pci i2c_hid i2c_algo_bit iosf_mbi drm_kms_helper video ahci syscopyarea sysfillrect sysimgblt fb_sys_fops libahci drm libata drm_panel_orientation_quirks dm_mirror [ 324.775339] dm_region_hash dm_log dm_mod [ 324.775344] CPU: 1 PID: 17759 Comm: bdepsecd Kdump: loaded Tainted: G W ------------ 3.10.0-957.1.3.el7.fanotify.x86_64 #1 [ 324.775348] Hardware name: Dell Inc. XPS 13 9350/0YT4WT, BIOS 1.7.0 01/16/2018 [ 324.775350] Call Trace: [ 324.775356] [<ffffffffa8961e41>] dump_stack+0x19/0x1b [ 324.775360] [<ffffffffa8297648>] __warn+0xd8/0x100 [ 324.775364] [<ffffffffa82976cf>] warn_slowpath_fmt+0x5f/0x80 [ 324.775369] [<ffffffffa843ec9a>] ? vfs_open+0x5a/0xb0 [ 324.775373] [<ffffffffa8594c7c>] __list_add+0xac/0xc0 [ 324.775378] [<ffffffffa848d1d6>] fanotify_read+0x2a6/0x5a0 [ 324.775382] [<ffffffffa82c2a10>] ? abort_exclusive_wait+0xa0/0xa0 [ 324.775386] [<ffffffffa844117f>] vfs_read+0x9f/0x170 [ 324.775389] [<ffffffffa844203f>] SyS_read+0x7f/0xf0 [ 324.775393] [<ffffffffa8974ddb>] system_call_fastpath+0x22/0x27 [ 324.775397] ---[ end trace e834a395da6ce84f ]--- [ 324.902124] ------------[ cut here ]------------ [ 324.902132] WARNING: CPU: 0 PID: 18693 at lib/list_debug.c:36 __list_add+0x8a/0xc0 [ 324.902135] list_add double add: new=ffff8a8d36b7a390, prev=ffff8a8d43b29b70, next=ffff8a8d36b7a390. [ 324.902136] Modules linked in: cmac ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 tun bridge stp llc devlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep hid_multitouch iTCO_wdt iTCO_vendor_support intel_wmi_thunderbolt dell_wmi arc4 iwlmvm intel_pmc_core intel_powerclamp coretemp intel_rapl mac80211 kvm_intel vfat fat dell_laptop kvm snd_hda_codec_hdmi dell_smbios dell_wmi_descriptor dcdbas dell_led irqbypass snd_hda_codec_realtek snd_soc_skl snd_hda_codec_generic snd_soc_skl_ipc snd_hda_ext_core snd_soc_sst_dsp iwlwifi snd_soc_sst_ipc snd_soc_acpi snd_soc_core snd_compress snd_hda_intel snd_hda_codec joydev snd_hda_core snd_hwdep snd_seq [ 324.902187] snd_seq_device pcspkr snd_pcm rtsx_pci_ms memstick uvcvideo cfg80211 videobuf2_vmalloc snd_timer videobuf2_memops videobuf2_core snd videodev soundcore i2c_i801 btusb btrtl btbcm btintel bluetooth rfkill idma64 virt_dma i2c_designware_platform i2c_designware_core wmi pinctrl_sunrisepoint pinctrl_intel intel_hid sparse_keymap int3400_thermal acpi_pad mei_me mei binfmt_misc auth_rpcgss sunrpc ip_tables xfs libcrc32c dm_crypt drbg ansi_cprng rtsx_pci_sdmmc mmc_core crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel i915 ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd serio_raw nvme nvme_core rtsx_pci i2c_hid i2c_algo_bit iosf_mbi drm_kms_helper video ahci syscopyarea sysfillrect sysimgblt fb_sys_fops libahci drm libata drm_panel_orientation_quirks dm_mirror [ 324.902233] dm_region_hash dm_log dm_mod [ 324.902237] CPU: 0 PID: 18693 Comm: dbus-launch Kdump: loaded Tainted: G W ------------ 3.10.0-957.1.3.el7.fanotify.x86_64 #1 [ 324.902239] Hardware name: Dell Inc. XPS 13 9350/0YT4WT, BIOS 1.7.0 01/16/2018 [ 324.902241] Call Trace: [ 324.902247] [<ffffffffa8961e41>] dump_stack+0x19/0x1b [ 324.902251] [<ffffffffa8297648>] __warn+0xd8/0x100 [ 324.902254] [<ffffffffa82976cf>] warn_slowpath_fmt+0x5f/0x80 [ 324.902258] [<ffffffffa83df5b7>] ? anon_vma_interval_tree_insert+0x97/0xa0 [ 324.902261] [<ffffffffa83f6557>] ? anon_vma_chain_link+0x37/0x40 [ 324.902265] [<ffffffffa8594c5a>] __list_add+0x8a/0xc0 [ 324.902269] [<ffffffffa83f654a>] anon_vma_chain_link+0x2a/0x40 [ 324.902273] [<ffffffffa83f8909>] anon_vma_fork+0xe9/0x130 [ 324.902277] [<ffffffffa82947f3>] dup_mm+0x473/0x750 [ 324.902281] [<ffffffffa8295f52>] copy_process+0x1452/0x1a40 [ 324.902285] [<ffffffffa82966f1>] do_fork+0x91/0x320 [ 324.902289] [<ffffffffa8296a06>] SyS_clone+0x16/0x20 [ 324.902293] [<ffffffffa89751a4>] stub_clone+0x44/0x70 [ 324.902297] [<ffffffffa8974ddb>] ? system_call_fastpath+0x22/0x27 [ 324.902300] ---[ end trace e834a395da6ce850 ]--- [ 324.902316] BUG: unable to handle kernel paging request at 00007f96c05d8000 [ 324.902319] IP: [<ffffffffa841bf64>] kmem_cache_alloc+0x74/0x1f0 [ 324.902325] PGD 8000000143adc067 PUD 1493c1067 PMD 14386a067 PTE 8000000132ff2865 [ 324.902330] Oops: 0001 [#1] SMP [ 324.902333] Modules linked in: cmac ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 tun bridge stp llc devlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep hid_multitouch iTCO_wdt iTCO_vendor_support intel_wmi_thunderbolt dell_wmi arc4 iwlmvm intel_pmc_core intel_powerclamp coretemp intel_rapl mac80211 kvm_intel vfat fat dell_laptop kvm snd_hda_codec_hdmi dell_smbios dell_wmi_descriptor dcdbas dell_led irqbypass snd_hda_codec_realtek snd_soc_skl snd_hda_codec_generic snd_soc_skl_ipc snd_hda_ext_core snd_soc_sst_dsp iwlwifi snd_soc_sst_ipc snd_soc_acpi snd_soc_core snd_compress snd_hda_intel snd_hda_codec joydev snd_hda_core snd_hwdep snd_seq [ 324.902376] snd_seq_device pcspkr snd_pcm rtsx_pci_ms memstick uvcvideo cfg80211 videobuf2_vmalloc snd_timer videobuf2_memops videobuf2_core snd videodev soundcore i2c_i801 btusb btrtl btbcm btintel bluetooth rfkill idma64 virt_dma i2c_designware_platform i2c_designware_core wmi pinctrl_sunrisepoint pinctrl_intel intel_hid sparse_keymap int3400_thermal acpi_pad mei_me mei binfmt_misc auth_rpcgss sunrpc ip_tables xfs libcrc32c dm_crypt drbg ansi_cprng rtsx_pci_sdmmc mmc_core crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel i915 ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd serio_raw nvme nvme_core rtsx_pci i2c_hid i2c_algo_bit iosf_mbi drm_kms_helper video ahci syscopyarea sysfillrect sysimgblt fb_sys_fops libahci drm libata drm_panel_orientation_quirks dm_mirror [ 324.902423] dm_region_hash dm_log dm_mod [ 324.902428] CPU: 0 PID: 18693 Comm: dbus-launch Kdump: loaded Tainted: G W ------------ 3.10.0-957.1.3.el7.fanotify.x86_64 #1 [ 324.902430] Hardware name: Dell Inc. XPS 13 9350/0YT4WT, BIOS 1.7.0 01/16/2018 [ 324.902433] task: ffff8a8c3108c100 ti: ffff8a8d3e4a0000 task.ti: ffff8a8d3e4a0000 [ 324.902435] RIP: 0010:[<ffffffffa841bf64>] [<ffffffffa841bf64>] kmem_cache_alloc+0x74/0x1f0 [ 324.902441] RSP: 0018:ffff8a8d3e4a3d30 EFLAGS: 00010282 [ 324.902443] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000000bd1d1 [ 324.902445] RDX: 00000000000bd1d0 RSI: 00000000000000d0 RDI: ffff8a8d7a001b00 [ 324.902447] RBP: ffff8a8d3e4a3d60 R08: 000000000001f0a0 R09: ffffffffa83f88c3 [ 324.902450] R10: ffff8a8d43b29af8 R11: ffff8a8d3e4a396e R12: 00007f96c05d8000 [ 324.902452] R13: 00000000000000d0 R14: ffff8a8d7a001b00 R15: ffff8a8d7a001b00 [ 324.902455] FS: 00007f96c3eb6880(0000) GS:ffff8a8d7ec00000(0000) knlGS:0000000000000000 [ 324.902458] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 324.902460] CR2: 00007f96c05d8000 CR3: 000000014389a000 CR4: 00000000003607f0 [ 324.902463] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 324.902465] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 324.902467] Call Trace: [ 324.902472] [<ffffffffa83f88c3>] ? anon_vma_fork+0xa3/0x130 [ 324.902476] [<ffffffffa83f88c3>] anon_vma_fork+0xa3/0x130 [ 324.902480] [<ffffffffa82947f3>] dup_mm+0x473/0x750 [ 324.902484] [<ffffffffa8295f52>] copy_process+0x1452/0x1a40 [ 324.902488] [<ffffffffa82966f1>] do_fork+0x91/0x320 [ 324.902492] [<ffffffffa8296a06>] SyS_clone+0x16/0x20 [ 324.902497] [<ffffffffa89751a4>] stub_clone+0x44/0x70 [ 324.902500] [<ffffffffa8974ddb>] ? system_call_fastpath+0x22/0x27 [ 324.902503] Code: 52 bf 57 49 8b 50 08 4d 8b 20 49 8b 40 10 4d 85 e4 0f 84 28 01 00 00 48 85 c0 0f 84 1f 01 00 00 49 63 46 20 48 8d 4a 01 4d 8b 06 <49> 8b 1c 04 4c 89 e0 65 49 0f c7 08 0f 94 c0 84 c0 74 ba 49 63 [ 324.902545] RIP [<ffffffffa841bf64>] kmem_cache_alloc+0x74/0x1f0 [ 324.902549] RSP <ffff8a8d3e4a3d30> [ 324.902551] CR2: 00007f96c05d8000
-- Orion Poplawski Manager of NWRA Technical Systems 720-772-5637 NWRA, Boulder/CoRA Office FAX: 303-415-9702 3380 Mitchell Lane orion@nwra.com Boulder, CO 80301 https://www.nwra.com/
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