On Mon, Nov 06, 2017 at 03:53:08PM -0500, John Ferlan wrote:
Resolve a storage driver crash as a result of a long running storageVolCreateXML when the virStorageVolPoolRefreshThread is run as a result of a storageVolUpload complete and ran the virStoragePoolObjClearVols without checking if the creation code was currently processing a buildVol after incrementing the driver->asyncjob count.
I thought the whole point of refreshing the pool in a thread was to have the storage driver usable for other things. This effectively disables pool refresh during long-running jobs.
The refreshThread needs to wait until all creation threads are completed so as to not alter the volume list while the volume is being built. Crash from valgrind is as follows (with a bit of editing): ==21309== Invalid read of size 8 ==21309== at 0x153E47AF: storageBackendUpdateVolTargetInfo ==21309== by 0x153E4C30: virStorageBackendUpdateVolInfo ==21309== by 0x153E52DE: virStorageBackendVolRefreshLocal ==21309== by 0x153DE29E: storageVolCreateXML
This is a fault of storageVolCreateXML for using invalid objects after dropping the locks. Jan
==21309== by 0x562035B: virStorageVolCreateXML ==21309== by 0x147366: remoteDispatchStorageVolCreateXML ... ==21309== Address 0x2590a720 is 64 bytes inside a block of size 336 free'd ==21309== at 0x4C2F2BB: free ==21309== by 0x54CB9FA: virFree ==21309== by 0x55BC800: virStorageVolDefFree ==21309== by 0x55BF1D8: virStoragePoolObjClearVols ==21309== by 0x153D967E: virStorageVolPoolRefreshThread ... ==21309== Block was alloc'd at ==21309== at 0x4C300A5: calloc ==21309== by 0x54CB483: virAlloc ==21309== by 0x55BDC1F: virStorageVolDefParseXML ==21309== by 0x55BDC1F: virStorageVolDefParseNode ==21309== by 0x55BE5A4: virStorageVolDefParse ==21309== by 0x153DDFF1: storageVolCreateXML ==21309== by 0x562035B: virStorageVolCreateXML ==21309== by 0x147366: remoteDispatchStorageVolCreateXML ... Signed-off-by: John Ferlan <jferlan redhat com> --- src/storage/storage_driver.c | 9 +++++++++ 1 file changed, 9 insertions(+)
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