Page fault while link_path_walk for path_len > 4060 bytes

On Mon, Aug 28, 2017 at 09:53:00AM +0530, ankijain at codeaurora.org wrote:

Hi Will Deacon/ Al viro


-->Please find the attached kmsg.txt
<3>[17620.275249] BUG: sleeping function called from invalid context at /local/mnt/workspace/lnxbuild/project/trees_in_use/free_tree_platform_manifest_refs_tags_AU_LINUX_ANDROID_LA.UM.5.7.07.01.01.287.725_sdm660_64_commander_26168534/checkout/kernel/msm-4.4/arch/arm64/mm/fault.c:313
<3>[17620.276504] in_atomic(): 0, irqs_disabled(): 0, pid: 10290, name:
stress-ng-dirde
<6>[17620.298995] ------------[ cut here ]------------
<2>[17620.299009] kernel BUG at /local/mnt/workspace/lnxbuild/project/trees_in_use/free_tree_platform_manifest_refs_tags_AU_LINUX_ANDROID_LA.UM.5.7.07.01.01.287.725_sdm660_64_commander_26168534/checkout/kernel/msm-4.4/kernel/sched/core.c:8528!
<6>[17620.306372] ------------[ cut here ]------------
<2>[17620.327239] kernel BUG at /local/mnt/workspace/lnxbuild/project/trees_in_use/free_tree_platform_manifest_refs_tags_AU_LINUX_ANDROID_LA.UM.5.7.07.01.01.287.725_sdm660_64_commander_26168534/checkout/kernel/msm-4.4/kernel/sched/core.c:8528!


--> we are using arm64 machine with kernel 4.4.
--> can you please guide us, how to capture ESR value while taking the
fault?
-->
-    { do_page_fault,    SIGSEGV, SEGV_MAPERR,    "level 3 translation
fault"    },
+    { do_translation_fault,    SIGSEGV, SEGV_MAPERR,    "level 3
translation fault"    },
we will try with above changes and get back to you.

Did you test with this change?

Will