Yes, definitely the main thread - we close down the database during applicationWillTerminate. It gives us 5 seconds to exit before it triggers the watchdog.
Termination Description: SPRINGBOARD, process-exit watchdog transgression: xxx exhausted real (wall clock) time allowance of 5.00 seconds | | ProcessVisibility: Foreground | ProcessState: Running | WatchdogEvent: process-exit | WatchdogVisibility: Foreground | WatchdogCPUStatistics: ( | "Elapsed total CPU time (seconds): 3.740 (user 3.740, system 0.000), 25% CPU", | "Elapsed application CPU time (seconds): 0.049, 0% CPU" | ) Triggered by Thread: 0 Thread 0 crashed: __semwait_signal: external code (libsystem_kernel.dylib) nanosleep: external code (libsystem_c.dylib) +[NSThread sleepForTimeInterval:]: external code (Foundation) Database::signalCloseAndWait() App::~App() -[AppDelegate applicationWillTerminate:]: appdelegate.mm @ 377 -[UIApplication _terminateWithStatus:]: external code (UIKit) "If the offending call really was "sqlite3LeaveMutexAndCloseZombie" then you may have some sort of mismanagement in your code" What do you mean by that? Is it abnormal for sqlite3close to call sqlite3LeaveMutexAndCloseZombie? - Deon -----Original Message----- From: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] On Behalf Of Simon Slavin Sent: Wednesday, February 21, 2018 7:23 AM To: SQLite mailing list <sqlite-users@mailinglists.sqlite.org> Subject: Re: [sqlite] iOS Watchdog and database corruption On 21 Feb 2018, at 2:35pm, Deon Brewis <de...@outlook.com> wrote: > The application got watchdog terminated by iOS because the main thread was > taking too long (waiting for the sqlite3close on the worker thread). The > resultant force close seems to have aborted SQLITE in such a way that it > caused the database to be corrupted. > > Worker thread stack: > Thread 4: > ftruncate: external code (libsystem_kernel.dylib) > unixTruncate: sqlite3.c @ 34036 > sqlite3WalCheckpoint: sqlite3.c @ 56846 > sqlite3WalClose: sqlite3.c @ 56955 > sqlite3PagerClose: sqlite3.c @ 51556 > sqlite3BtreeClose: sqlite3.c @ 62169 > sqlite3LeaveMutexAndCloseZombie: sqlite3.c @ 142752 > sqlite3Close: sqlite3.c @ 0 I'm puzzled by this. iOS gives applications quite a long time to terminate before calling "kill" on them. Had "applicationWillTerminate" been called ? Was it definitely your main thread (via thread 4) which was delaying the termination, and not another thread ? You should find the offending thread identified further up in that same report, just before it starts listing the call-stacks of each thread. If the offending call really was "sqlite3LeaveMutexAndCloseZombie" then you may have some sort of mismanagement in your code. Or it might be just a once-in-a-blue-moon problem which will never occur again. The rest I lave up to the devs. SQLite should not be corrupting a database just because it was unexpectedly terminated, no matter what it was doing when terminated. It was written to avoid that and no amount of testing has shown such a bug. > SQLITE3 version is 3.20.1. Database size is around 5 GB. You have a 5 GB database on a device which may have a 16 GB capacity ? I assume you know what you're doing. Simon. _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailinglists.sqlite.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fsqlite-users&data=02%7C01%7C%7C84050f4c5810477347f708d5793effe3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636548233837936119&sdata=ALIGynOvAu4HWcRE3wlBELXyEjC39PDXTYJDSNnJiqc%3D&reserved=0 _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users