There's strace mentioned in the wiki, so I did it too.
While the wallpaper thumbnails are being loaded, the log is filled with
this (only one fragment is shown, whole log file is too big, over 500KiB
in tar.lzma):
[pid 882] 07:51:59.546835 gettimeofday({1209768719, 546892}, NULL) = 0
[pid 882] 07:51:59.547897
lstat64("/home/rubicon/Картинки/Vague_Illusions_by_Levoduction.jpg",
{st_mode=S_IFREG|0644, st_size=958370, ...}) = 0
[pid 882] 07:51:59.548247
lstat64("/home/rubicon/Картинки/Vague_Illusions_by_Levoduction.jpg",
{st_mode=S_IFREG|0644, st_size=958370, ...}) = 0
[pid 882] 07:51:59.548467 time(NULL) = 1209768719
[pid 882] 07:51:59.548606
open("/home/rubicon/.thumbnails/normal/016c09836fdfa47bd1afea5afc55ce00.png",
O_RDONLY|O_LARGEFILE) = 118
[pid 882] 07:51:59.548760 fstat64(118, {st_mode=S_IFREG|0600, st_size=32779,
...}) = 0
[pid 882] 07:51:59.548917 mmap2(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb68c8000
[pid 882] 07:51:59.549027 read(118,
"\211PNG\r\n\32\n\0\0\0\rIHDR\0\0\0\200\0\0\0r\10\2\0\0"..., 4096) = 4096
[pid 882] 07:51:59.549181 _llseek(118, 0, [0], SEEK_SET) = 0
[pid 882] 07:51:59.549297 read(118,
"\211PNG\r\n\32\n\0\0\0\rIHDR\0\0\0\200\0\0\0r\10\2\0\0"..., 4096) = 4096
[pid 882] 07:51:59.549482 read(118,
"\356v\276\355TbU\222\312\240\344\242\0\245\371\223\217"..., 4096) = 4096
[pid 882] 07:51:59.549634 read(118,
")\245\214\305\30\201\31B\344\30\20\0\214ek$F_U\274\333"..., 4096) = 4096
[pid 882] 07:51:59.550188 read(118,
"\341\0303\222\267r3\35\276{\377\0367\270\265\0063L-Ra\17"..., 4096) = 4096
[pid 882] 07:51:59.550353 read(118,
"\365x\322\337\346\301\215\235\235\33\273\233\377\327\237"..., 4096) = 4096
[pid 882] 07:51:59.550947 read(118,
"\275\341\311bzm\274\276\2776\271\277\312^^\333:\317\226"..., 4096) = 4096
[pid 882] 07:51:59.551080 read(118,
"\301\274\256\277r\345\332\255\311Z\314\274\306\231\217"..., 4096) = 4096
[pid 882] 07:51:59.551594 read(118, "\353`8Bf\tA\202\207\0205\266\r\247)
\263\210\260\0178"..., 4096) = 4096
[pid 882] 07:51:59.552301 read(118, "\0\0\0IEND\256B`\202", 4096) = 11
[pid 882] 07:51:59.552477 close(118) = 0
[pid 882] 07:51:59.552609 munmap(0xb68c8000, 4096) = 0
[pid 882] 07:51:59.552744
open("/home/rubicon/.thumbnails/normal/016c09836fdfa47bd1afea5afc55ce00.png",
O_RDONLY|O_LARGEFILE) = 118
[pid 882] 07:51:59.552915 fstat64(118, {st_mode=S_IFREG|0600, st_size=32779,
...}) = 0
[pid 882] 07:51:59.553067 mmap2(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb68c8000
[pid 882] 07:51:59.553174 read(118,
"\211PNG\r\n\32\n\0\0\0\rIHDR\0\0\0\200\0\0\0r\10\2\0\0"..., 4096) = 4096
[pid 882] 07:51:59.553321 _llseek(118, 0, [0], SEEK_SET) = 0
[pid 882] 07:51:59.553432 read(118,
"\211PNG\r\n\32\n\0\0\0\rIHDR\0\0\0\200\0\0\0r\10\2\0\0"..., 4096) = 4096
[pid 882] 07:51:59.553820 read(118,
"\356v\276\355TbU\222\312\240\344\242\0\245\371\223\217"..., 4096) = 4096
[pid 882] 07:51:59.554009 read(118,
")\245\214\305\30\201\31B\344\30\20\0\214ek$F_U\274\333"..., 4096) = 4096
[pid 882] 07:51:59.554535 read(118,
"\341\0303\222\267r3\35\276{\377\0367\270\265\0063L-Ra\17"..., 4096) = 4096
[pid 882] 07:51:59.554694 read(118,
"\365x\322\337\346\301\215\235\235\33\273\233\377\327\237"..., 4096) = 4096
[pid 882] 07:51:59.555489 read(118,
"\275\341\311bzm\274\276\2776\271\277\312^^\333:\317\226"..., 4096) = 4096
[pid 882] 07:51:59.555691 read(118,
"\301\274\256\277r\345\332\255\311Z\314\274\306\231\217"..., 4096) = 4096
[pid 882] 07:51:59.556437 read(118, "\353`8Bf\tA\202\207\0205\266\r\247)
\263\210\260\0178"..., 4096) = 4096
[pid 882] 07:51:59.557279 read(118, "\0\0\0IEND\256B`\202", 4096) = 11
[pid 882] 07:51:59.557452 close(118) = 0
[pid 882] 07:51:59.557578 munmap(0xb68c8000, 4096) = 0
[pid 882] 07:51:59.558507
lstat64("/home/rubicon/Картинки/Vague_Illusions_by_Levoduction.jpg",
{st_mode=S_IFREG|0644, st_size=958370, ...}) = 0
[pid 882] 07:51:59.558756 time(NULL) = 1209768719
[pid 882] 07:51:59.558881
open("/home/rubicon/.thumbnails/normal/016c09836fdfa47bd1afea5afc55ce00.png",
O_RDONLY|O_LARGEFILE) = 118
[pid 882] 07:51:59.559032 fstat64(118, {st_mode=S_IFREG|0600, st_size=32779,
...}) = 0
[pid 882] 07:51:59.559182 mmap2(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb68c8000
[pid 882] 07:51:59.559289 read(118,
"\211PNG\r\n\32\n\0\0\0\rIHDR\0\0\0\200\0\0\0r\10\2\0\0"..., 4096) = 4096
[pid 882] 07:51:59.559441 _llseek(118, 0, [0], SEEK_SET) = 0
[pid 882] 07:51:59.559568 read(118,
"\211PNG\r\n\32\n\0\0\0\rIHDR\0\0\0\200\0\0\0r\10\2\0\0"..., 4096) = 4096
[pid 882] 07:51:59.559713 brk(0x8c3a000) = 0x8c3a000
[pid 882] 07:51:59.559867 read(118,
"\356v\276\355TbU\222\312\240\344\242\0\245\371\223\217"..., 4096) = 4096
[pid 882] 07:51:59.559996 read(118,
")\245\214\305\30\201\31B\344\30\20\0\214ek$F_U\274\333"..., 4096) = 4096
[pid 882] 07:51:59.560597 read(118,
"\341\0303\222\267r3\35\276{\377\0367\270\265\0063L-Ra\17"..., 4096) = 4096
[pid 882] 07:51:59.560727 read(118,
"\365x\322\337\346\301\215\235\235\33\273\233\377\327\237"..., 4096) = 4096
[pid 882] 07:51:59.561371 read(118,
"\275\341\311bzm\274\276\2776\271\277\312^^\333:\317\226"..., 4096) = 4096
[pid 882] 07:51:59.561499 read(118,
"\301\274\256\277r\345\332\255\311Z\314\274\306\231\217"..., 4096) = 4096
[pid 882] 07:51:59.562110 read(118, "\353`8Bf\tA\202\207\0205\266\r\247)
\263\210\260\0178"..., 4096) = 4096
[pid 882] 07:51:59.562712 read(118, "\0\0\0IEND\256B`\202", 4096) = 11
[pid 882] 07:51:59.562944 close(118) = 0
[pid 882] 07:51:59.563046 munmap(0xb68c8000, 4096) = 0
[pid 882] 07:51:59.563173
open("/home/rubicon/Картинки/Vague_Illusions_by_Levoduction.jpg",
O_RDONLY|O_LARGEFILE) = 118
[pid 882] 07:51:59.563346 fstat64(118, {st_mode=S_IFREG|0644, st_size=958370,
...}) = 0
[pid 882] 07:51:59.563500 mmap2(NULL, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb68c8000
[pid 882] 07:51:59.563627 read(118,
"\377\330\377\340\0\20JFIF\0\1\1\1\1,\1,\0\0\377\333\0C"..., 4096) = 4096
[pid 882] 07:51:59.563880 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
[pid 882] 07:51:59.564116 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
[pid 882] 07:51:59.564250 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 882] 07:51:59.564359 close(118) = 0
[pid 882] 07:51:59.564458 munmap(0xb68c8000, 4096) = 0
If you think full strace log may help you, tell me!
--
Handling large list of wallpaper images in Appearance Preferences dialog
freezes the window
https://bugs.launchpad.net/bugs/225862
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