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FS#2201 - kernel error: do_page_fault(): sending SIGSEGV to reader#1 for invalid read access from 77a87d90 #8114

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openwrt-bot opened this issue Mar 22, 2019 · 7 comments
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camel:

current trunk from 22.3.2019
git-19.079.18950-11e64f8) / OpenWrt SNAPSHOT r9672-d78e229903

i see in the logs that having more often kernel error:

Fri Mar 22 15:14:27 2019 kern.info kernel: [11750.766284] do_page_fault(): sending SIGSEGV to reader#1 for invalid read access from 77a87d90 Fri Mar 22 15:14:27 2019 kern.info kernel: [11750.774984] epc = 77f55944 in libc.so[77edb000+94000] Fri Mar 22 15:14:27 2019 kern.info kernel: [11750.780320] ra = 77f558e0 in libc.so[77edb000+94000]

any idea about what can be the reason for it ? or how i can give you more infos ?

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camel:

i have this kernel issue every day around 2-3 times ... :(
same address

Sat Mar 30 07:48:57 2019 kern.info kernel: [524298.382997] do_page_fault(): sending SIGSEGV to reader#1 for invalid read access from 77ac1d90 Sat Mar 30 07:48:57 2019 kern.info kernel: [524298.391883] epc = 77f8f944 in libc.so[77f15000+94000] Sat Mar 30 07:48:57 2019 kern.info kernel: [524298.397135] ra = 77f8f8e0 in libc.so[77f15000+94000]

device: ZBT-3526 16MB (mt7621)
and i see no lines before or afterwards :(

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camel:

any news ?
was anyone looking on that ?
nothing ?

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simontretter:

Did you build yourself? If so, any changes to the defaults (gcc version, optmization flags...)?

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yousong:

Are you running collectd and do you happen to have more than 1 WriteThreads? This one and FS#2264 are likely the same issue

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camel:

yes, I'm using the collectd very much ...
and writethreads are on 2 or 4 - depends on cpu and mem (eg: mt7621 - using 4 / mt7620 - using 2)
should i try to set it to 1 ?

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yousong:

It's worth a try. I worked around it that way after collectd/collectd#3310

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camel:

hmm, i will test with deactivated nf_cache module

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