error in process sentinel: mu server process received signal 11

[thierryvolpiatto]

Expected or desired behavior

No error.

Actual behavior

Hello since recently, I often have this error when using "b u" aka bookmark unread when I want to read my new mails.
The first hit on "b u" trigger the error, the second hit show the unread mails as usual.

So the error is in the title:

error in process sentinel: mu server process received signal 11

Steps to reproduce

It's difficult to reproduce, it happen only sometimes.

Versions of mu, mu4e/emacs, operating system etc.

Emacs-28.0.50 but happens as well on Emacs-27.
Mu from master.

Any other detail

E.g. are you using the gnus-based message view?

Yes.

[djcb]

Oh, signal 11 is a segfault.. are you able to get a backtrace? E.g. coredumpctl can get those, if you're using that.

[thierryvolpiatto]

"Dirk-Jan C. Binnema" ***@***.***> writes:

[[PGP Encrypted Part:OK]] Oh, signal 11 is a segfault.. are you able to get a backtrace?

No, not for now, I don't remember how to get a backtrace from gdb. Any help welcome.

E.g. coredumpctl can get those, if you're using that.

No idea how to use this.

…

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-- Thierry

[djcb]

I you have coredumpctl installed, it should be quite easy; execute coredumpctl, see the mu crash (and its PID), and execute coredumpctl info <pid>, with <pid> being the one from the list.

[thierryvolpiatto]

"Dirk-Jan C. Binnema" ***@***.***> writes:

[[PGP Encrypted Part:OK]] I you have coredumpctl installed, it should be quite easy; execute coredumpctl, see the mu crash (and its PID), and execute coredumpctl info <pid>, with <pid> being the one from the list.

Thanks I have it: Thu 2021-04-29 21:36:15 CEST 2054 1000 1000 11 present /usr/local/bin/mu thierry@IPadS340:~/tmp/emacs$ coredumpctl info 2054 PID: 2054 (mu) UID: 1000 (thierry) GID: 1000 (thierry) Signal: 11 (SEGV) Timestamp: Thu 2021-04-29 21:36:15 CEST (10h ago) Command Line: /usr/local/bin/mu server Executable: /usr/local/bin/mu Control Group: /user.slice/user-1000.slice/session-c2.scope Unit: session-c2.scope Slice: user-1000.slice Session: c2 Owner UID: 1000 (thierry) Boot ID: 65c362f735da433a86ee5eb8b78d8be2 Machine ID: 775ccb91c8f84539a863dbbb02766c59 Hostname: IPadS340 Storage: /var/lib/systemd/coredump/core.mu.1000.65c362f735da433a86ee5eb8b78d8be2.2054.1619724975000000.lz4 Message: Process 2054 (mu) of user 1000 dumped core. Stack trace of thread 2054: #0 0x00007ffff6d5db40 _ZSt11_Hash_bytesPKvmm (libstdc++.so.6) #1 0x00005555555986bf _ZNSt10_Hash_impl4hashEPKvmm (mu) #2 0x000055555559680d _ZNSt13unordered_mapINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE9ContainerSt4hashIS5_ESt8equal_toIS5_ESaISt4pairIKS5_S6_EEE4f #3 0x00005555555904fc _ZNK2Mu5Query7Private12run_threadedEONS_12QueryResultsERN6Xapian7EnquireENS_10QueryFlagsEm (mu) #4 0x0000555555590ac1 _ZNK2Mu5Query7Private12run_singularERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEhNS_10QueryFlagsEm (mu) #5 0x00005555555912d5 _ZNK2Mu5Query7Private3runERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEhNS_10QueryFlagsEm (mu) #6 0x0000555555591440 _ZNK2Mu5Query3runERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEhNS_10QueryFlagsEm (mu) #7 0x00005555555a14b6 _ZN2Mu6Server7Private12find_handlerERKSt6vectorINS_4SexpESaIS3_EE (mu) #8 0x000055555559e278 _ZN2Mu6Server7Private6invokeERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE (mu) #9 0x0000555555573a94 _ZN2Mu13mu_cmd_serverEPKNS_9_MuConfigEPP7_GError (mu) #10 0x0000555555575fe3 _ZN2Mu14mu_cmd_executeEPKNS_9_MuConfigEPP7_GError (mu) #11 0x000055555556c5a5 main (mu) #12 0x00007ffff6110bf7 __libc_start_main (libc.so.6) #13 0x000055555556d0ea _start (mu)

…

-- Thierry

[djcb]

Ah, thanks, that helps narrowing things down a bit.

[thierryvolpiatto]

Update: Today I had no error since I have upgraded xapian to 1.4.5.1, crossing fingers :-) I will let you know if I still don't have error with this xapian version.

[thierryvolpiatto]

After nearly a week using xapian 1.4.5, I didn't have one error. Also sometimes, mu4e was hanging forever with a buffer "loading message...", this doesn't happen anymore, messages are loaded very fast.
Maybe documenting the usage of at least this xapian version would be good or forcing its usage when building.
Thanks.

[djcb]

Oh, that's good news! Thanks for testing. Let's hope that was the root cause.