Here's the offending source code up to the failing X call. I'm not so
sure that the math is right (or how getting it wrong might trigger this
bug)...
static cairo_xlib_shm_t *
_cairo_xlib_shm_pool_create(cairo_xlib_display_t *display,
size_t size, void **ptr)
{
Display *dpy = display->display;
cairo_xlib_shm_t *pool;
size_t bytes, maxbits = 16, minbits = MIN_BITS;
Status success;
pool = malloc (sizeof (cairo_xlib_shm_t));
if (pool == NULL)
return NULL;
bytes = 1 << maxbits;
while (bytes <= size)
bytes <<= 1, maxbits++;
bytes <<= 3;
minbits += (maxbits - 16) / 2;
pool->shm.shmid = shmget (IPC_PRIVATE, bytes, IPC_CREAT | 0600);
while (pool->shm.shmid == -1 && bytes >= 2*size) {
bytes >>= 1;
pool->shm.shmid = shmget (IPC_PRIVATE, bytes, IPC_CREAT | 0600);
}
if (pool->shm.shmid == -1)
goto cleanup;
pool->shm.readOnly = FALSE;
pool->shm.shmaddr = shmat (pool->shm.shmid, NULL, 0);
if (pool->shm.shmaddr == (char *) -1) {
shmctl (pool->shm.shmid, IPC_RMID, NULL);
goto cleanup;
}
pool->attached = XNextRequest (dpy);
success = XShmAttach (dpy, &pool->shm);
Possibly worth noting is that size==4096 at scale 200%, and size==256 at
scale 100%.
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https://bugs.launchpad.net/bugs/1751252
Title:
[regression] ubiquity crashed in debconf.py:104 with ValueError:
invalid literal for int() with base 10: ''
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