Re: git repack on shallow clone of large repo (linux kernel) hangs at "Enumerating objects"

Hi Jeff, sorry for long reply.

On 18/05/21 19.07, Jeff King wrote:

You need "strace -f". The parent repack process spawns pack-objects (via
the clone() call above), and then waits for it to print the name of the
generated pack at the end. So it will stall on that read() for quite a
while, even under normal circumstances.

-Peff

Now on my clone, git count-objects -v says:

count: 0
size: 0
in-pack: 3469192
packs: 7
size-pack: 2181233
prune-packable: 0
garbage: 0
size-garbage: 0

And I have 60211 commits, with the oldest tag available is v3.15-rc3.

Here is excerpt from strace -f just before I triggered SIGINT due to hang:

22903 openat(AT_FDCWD, ".git/objects/3b/tmp_obj_24pz93", O_RDWR|O_CREAT|O_EXCL, 0444) = 3
22903 write(3, "x\1+)JMU0421d040031Q\320K\316I\314K\327M\313/\312M,"..., 1113) = 1113
22903 close(3)                          = 0
22903 utime(".git/objects/3b/tmp_obj_24pz93", {actime=1621599665 /* 2021-05-21T19:21:05+0700 */, modtime=1621599665 /* 2021-05-21T19:21:05+0700 */}) = 0
22903 link(".git/objects/3b/tmp_obj_24pz93", ".git/objects/3b/816f00a02062692e95a9a756247fca34abb911") = 0
22903 unlink(".git/objects/3b/tmp_obj_24pz93") = 0
22903 access(".git/objects/3b/819396230eda4ce9be9fbb2c91c13ebb28e8d3", F_OK) = -1 ENOENT (No such file or directory)
22903 getpid()                          = 22903
22903 openat(AT_FDCWD, ".git/objects/3b/tmp_obj_yrHAe4", O_RDWR|O_CREAT|O_EXCL, 0444) = 3
22903 write(3, "x\1\224}y<\324\337\367\377(\205\262E\226\262D\205T\0233\214=\n!\25\205R\22\306\314`"..., 4096) = 4096
22903 write(3, "\365\16\236\215!&\37 \v\300\240\334\33r\266/_\317Hg,\333\356w\366\235\307\245<E\347\t"..., 4096) = 4096
22903 write(3, "\362\367\267\224Pc\207\252!\240$\"\26\212\204\22\2315\245\255\357j\373f\316G9\352[\r!\326"..., 4096) = 4096
22903 write(3, "\305\vC3\253\217\343\17kl>v\200_\226Y\206\247\21@\327mi\310\177{7{i\214w\243"..., 4096) = 4096
22903 write(3, "@X\17\213\304\307z\232v\355\313y\316,\342\202p\"\343|x\306\306<\335DM\350\315!m\207"..., 4096) = 4096
22903 write(3, "'\253R\33\267\310p\3\332\201\333\316\254'\3114\347\277\0321\35\223\314i\255v\252X{[r\33"..., 4096) = 4096
22903 write(3, "\261\341a\252\355\360\356\340\375A$\214\377\336O\311A\215\327\5g2\\\324\332\276\363\323\306S\215\342"..., 4096) = 4096
22903 write(3, "s_n83S\326\224]H\271\246-\267\35\32\234\6s!\273\177\30\256k\\eW\355E\264^"..., 4096) = 4096
22903 write(3, "E\0266\37\30244Mtk9\310\305\227\370\245\355qwUi\363\237\302\347S\4Xp\342\330\370"..., 4096) = 4096
22903 write(3, "v\267\303B\177\232v{\342\353\1\340A\205[\336\266\250_e\346\347e)\212^\241]\263\233\270\323"..., 4096) = 4096
22903 write(3, "\325dA\266\333\221\274\32\367\277\271nh\327\276\272C\323-E\242\351\232\352\303]|\335\227\227\200\301"..., 4096 <unfinished ...>
22902 <... read resumed>0x5594d878b7b0, 4096) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
22903 <... write resumed>)              = 4096

The last write() sequence seems running repeatedly, what it means? Infinite loop?

-- 
An old man doll... just what I always wanted! - Clara