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[[!comment format=mdwn
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username="yarikoptic"
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avatar="http://cdn.libravatar.org/avatar/f11e9c84cb18d26a1748c33b48c924b4"
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subject="comment 18"
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date="2022-06-06T14:50:16Z"
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content="""
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> I have made a standalone tarball built that way available here: https://downloads.kitenet.net/git-annex/linux/debuglocks/
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> It should display a backtrace on stderr when the MVar deadlock happens.
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jinxing helped ... thought I thought to complain that I don't see any traceback but apparently it is due to `-J5` (I guess) and lines being ovrewritten, but I managed to `Ctrl-s` at a point showing
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```
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get 0/0/0/3/5/50 (from web...)
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MVar deadlock detected CallStack (from HasCallStack):
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debugLocks, called at ./Database/Queue.hs:55:30 in main:Database.Queue
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thread blocked indefinitely in an MVar operation
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(Delaying 1s before retrying....)
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```
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which when I let it go became smth like
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```
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get 0/0/0/3/0/98 (from web...)
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thread blocked indefinitely in an MVar operation
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(Delaying 1s before retrying....)
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ok
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get 0/0/0/3/1/111 (from web...) ok
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```
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and reconfirmed for those in screenlog I quickly collected:
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```
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(base) dandi@drogon:~$ grep debugLocks screenlog.3
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debugLocks, called at ./Database/Queue.hs:55:30 in main:Database.Queue
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debugLocks, called at ./Database/Queue.hs:55:30 in main:Database.Queue
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debugLocks, called at ./Database/Queue.hs:55:30 in main:Database.Queue
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debugLocks, called at ./Database/Queue.hs:55:30 in main:Database.Queue
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debugLocks, called at ./Database/Queue.hs:55:30 in main:Database.Queue
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```
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"""]]
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