Opened 8 years ago
Closed 8 years ago
Last modified 6 years ago
#12668 closed Bug Report - General (Duplicate)
Crash in Mythtv backend while deleting recording from web interface (port 6544)
Reported by: | Owned by: | Bill Meek | |
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Priority: | major | Milestone: | 0.28.1 |
Component: | MythTV - Services API - Backend | Version: | Master Head |
Severity: | medium | Keywords: | |
Cc: | Ticket locked: | no |
Description (last modified by )
2016-02-28 00:42:12.744328 N AutoExpire: CalcParams(): Max required Free Space: 52.0 GB w/freq: 14 min 2016-02-28 00:42:12.749932 N Expiring 54 MB for 10004 at 2012-05-26T11:35:00Z => "Teleshop 4":Woningwijs 2016-02-28 00:42:12.753665 N Expiring 2038 MB for 10002 at 2012-07-28T17:58:00Z => "NOS Journaal" 2016-02-28 00:42:12.757577 E MainServer: ERROR when trying to delete file: myth://test-myth/10004_20120526133500.mpg. File doesn't exist. Database metadata will not be removed. 2016-02-28 00:42:12.764945 E MainServer: ERROR when trying to delete file: myth://test-myth/10002_20120728195800.mpg. File doesn't exist. Database metadata will not be removed. *** Error in `mythbackend': corrupted double-linked list: 0x93bb5310 *** ======= Backtrace: ========= /lib/libc.so.6(+0x77a1d)[0xb24e6a1d] /lib/libc.so.6(+0x7900f)[0xb24e800f] /usr/lib/libQt5Core.so.5(_ZN10QArrayData10deallocateEPS_jj+0x25)[0xb27e66c5] /usr/lib/libQt5Core.so.5(+0x26a108)[0xb29c6108] /usr/lib/libQt5Core.so.5(+0x260d68)[0xb29bcd68] /usr/lib/libQt5Core.so.5(+0x2613c6)[0xb29bd3c6] /usr/lib/libQt5Core.so.5(_ZNK14QFactoryLoader8instanceEi+0x31c)[0xb29b44ac] /usr/lib/libQt5Gui.so.5(+0x12d7ff)[0xb316d7ff] /usr/lib/libQt5Gui.so.5(_ZN12QImageWriter21supportedImageFormatsEv+0x2a0)[0xb316e290] mythbackend[0x81e33f3] /usr/local/lib/libmythservicecontracts-0.28.so.0(+0x1b53a)[0xb492a53a] /usr/local/lib/libmythservicecontracts-0.28.so.0(_ZN15ContentServices11qt_metacallEN11QMetaObject4CallEiPPv+0x76)[0xb492acba] mythbackend[0x820ca15] /usr/local/lib/libmythupnp-0.28.so.0(_ZN10MethodInfo6InvokeEP7ServiceRK4QMapI7QStringS3_E+0x60d)[0xb534dd13] /usr/local/lib/libmythupnp-0.28.so.0(_ZN11ServiceHost14ProcessRequestEP11HTTPRequest+0xe4b)[0xb534f999] /usr/local/lib/libmythupnp-0.28.so.0(_ZN10HttpServer15DelegateRequestEP11HTTPRequest+0x296)[0xb53069e2] /usr/local/lib/libmythupnp-0.28.so.0(+0x5fc30)[0xb5307c30] /usr/local/lib/libmythbase-0.28.so.0(+0x3ab4d)[0xb50fbb4d] /usr/local/lib/libmythbase-0.28.so.0(+0x37a29)[0xb50f8a29] /usr/lib/libQt5Core.so.5(+0x890e5)[0xb27e50e5] /lib/libpthread.so.0(+0x6955)[0xb2748955] /lib/libc.so.6(clone+0x5e)[0xb255785e]
Change History (10)
comment:1 Changed 8 years ago by
Component: | MythTV - General → MythTV - Web Frontend |
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Description: | modified (diff) |
Milestone: | unknown → 0.28 |
Owner: | set to stuartm |
Priority: | minor → major |
Status: | new → assigned |
comment:2 Changed 8 years ago by
Milestone: | 0.28 → 0.28.1 |
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comment:3 Changed 8 years ago by
I just wanted to point out that the same thing happens when you try to delete a recording from either MythWeb or Web Frontend.
comment:4 Changed 8 years ago by
Which version of QT? There is a known bug in one version which could explain this.
Otherwise we need a backtrace as described in the ticket how-to
comment:5 Changed 8 years ago by
I am using Qt 5.6.0 on Arch linux. I suspected a Qt bug based on this error message in the kernel ring buffer:
"segfault at 10 ip 00007fe68048dd10 sp 00007fe57f7fcfd0 error 4 in libQt5Core.so.5.6.0[7fe680203000+4bf000]"
What's the last known working version of Qt?
comment:6 Changed 8 years ago by
This problem seems to be related to GCC 6 and "some non-conforming code-bases" including Qt-5 as stated here https://gcc.gnu.org/gcc-6/changes.html. A workaround is to build Qt5 with the GCC flag -fno-delete-null-pointer-checks. This issue has been discussed on the Qt Development mailing list http://lists.qt-project.org/pipermail/development/2016-March/025153.html but it clearly has not been fixed as of the 5.6 release.
comment:8 Changed 8 years ago by
Owner: | changed from stuartm to Bill Meek |
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comment:9 Changed 8 years ago by
Component: | MythTV - Web Frontend → MythTV - Services API - Backend |
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Resolution: | → Duplicate |
Status: | assigned → closed |
OP:
Closing because the solution is likely being tracked in #12782. A true backtrace from gdb as requested earlier would confirm the issue. The original backtrace doesn't provide the necessary information. It does, however, reference QMetaObject. It doesn't have indexOfClassInfo in it, which is where the SEGV fires.
This is a good test:
curl --data RecordedId=12345 <backend>:6544/Dvr/DeleteRecording
The above works on 29-pre but drops core in 0.28. Just use a RecordedId that you don't have, no need to actually delete a recording. The a good response will be: false.
If the gdb output points to another method, then please reopen.
comment:10 Changed 6 years ago by
Owner: | changed from Bill Meek to Bill Meek |
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Moving unresolved tickets to next point release