Mobile/4.0b5 crashes
Don't bother looking at crashes newer than March 4, and even ones from then can be hit or miss - some have been reprocessed, most haven't. The numbers on the main crash listing page mean nothing and are frequently incorrect, unfortunately.
tl;dr: The generic OOM (libc.so, 0xdeadbaad), nsJNIString leak (libdvm.so, 0xdeadd00d), and CloseSuperfluousFds (libc.so, non-0xdeadbaad) triumvirate take the cake for probably >90% of all crashes. The JNIString leak is fixed, and the CloseSuperfluousFds crash only happens in the content process, so we're in decent shape.
Now, drilling down:
Most named stacks are invalid recent ones or references to old reprocessed ones - the vast majority of crashes are hidden behind libc.so, libdvm.so and libxul.so. Continue to see libz.so stacks, not necessarily happening on cyanogenmod devices. OOM stacks are still pretty screwed up and don't give much useful info (libc.so, crash address 0xdeadbaad) Child process crashes don't display hardware type - this is a known bug.
OOM stacks - why are they so wacky? Either they have a single common nonsense frame showing after mozalloc_abort (nsXULTemplateQueryProcessorRDF::ComputeContainmentProperties), or they have a bunch of unrelated stacks interleaved,like https://crash-stats.mozilla.com/report/index/697fd5b5-fca4-4bb3-a748-72fd12110227
Other common crashes:
gfxFont::AddRef
nsThebesFontMetrics::GetMetrics
nsXPConnect::GetPrincipal and friends, but that's fixed in recent builds (yay!)
js::Interpret coming out of nsFrameMessageManager
Large numbers of libc-2.5.so crashes with non-useful stack, quite mysterious
Interesting crashes encountered:
A couple js_EmitTree crashes at startup
Strange PR_AtomicDecrement stacks, ipc-related: https://crash-stats.mozilla.com/report/list?range_value=2&range_unit=weeks&date=2011-03-05%2005%3A00%3A00&signature=PR_AtomicDecrement%20%7C%20PR_DestroyCondVar&version=Fennec%3A4.0b5
Seems like any stack that begins with "@0x0 |" contains Java_org_mozilla_gecko_GeckoAppShell_callObserver
The regular nsTHashtable<mozilla::FrameLayerBuilder::ThebesLayerItemsEntry>::s_ClearEntry> crash is still around: https://crash-stats.mozilla.com/report/list?range_value=2&range_unit=weeks&date=2011-03-05%2005%3A00%3A00&signature=nsTArray_base%3CnsTArrayDefaultAllocator%3E%3A%3AShiftData%20%7C%20nsTHashtable%3Cmozilla%3A%3AFrameLayerBuilder%3A%3AThebesLayerItemsEntry%3E%3A%3As_ClearEntry&version=Fennec%3A4.0b5
libGLES* crashes: https://crash-stats.mozilla.com/report/list?range_value=2&range_unit=weeks&date=2011-03-05%2005%3A00%3A00&signature=libGLESv2_adreno200.so%400x7afd6&version=Fennec%3A4.0b5 https://crash-stats.mozilla.com/report/index/4bff1f97-1180-4247-acee-501002110301
AndroidBridge::SetClipboardText: https://crash-stats.mozilla.com/report/index/739b7d65-e12b-4c2b-9520-5f7722110304
xpconnect: https://crash-stats.mozilla.com/report/index/ac049960-85b6-495f-a76e-ce7402110227
PL_Arena_Allocate: https://crash-stats.mozilla.com/report/index/4355382b-9607-437c-9547-d03992110226
js: https://crash-stats.mozilla.com/report/index/47b646fe-68bc-471e-8a21-25fbd2110227
libz, from turning canvas data into a png: https://crash-stats.mozilla.com/report/index/793dbf2b-b8ff-4d58-90cf-fa4832110301 https://crash-stats.mozilla.com/report/index/b035bb8d-d636-466a-9d6d-331c92110302
Varities of different crashes hiding behind libc.so and libxul.so, in descending popularity:
neon_composite_src_0565_0565: https://crash-stats.mozilla.com/report/list?range_value=2&range_unit=weeks&date=2011-03-05%2005%3A00%3A00&signature=libxul.so%400xc533e4&version=Fennec%3A4.0b5
HttpChannelChild::OnDataAvailable: https://crash-stats.mozilla.com/report/list?range_value=2&range_unit=weeks&date=2011-03-05%2005%3A00%3A00&signature=libxul.so%400xdb100&version=Fennec%3A4.0b5
js mjit: https://crash-stats.mozilla.com/report/index/ec523b7d-8026-428d-96fa-f1fe82110301
chromium ipc: https://crash-stats.mozilla.com/report/index/81df1589-e9fe-4b3b-94a9-af1a12110304
cycle collector: https://crash-stats.mozilla.com/report/index/b1dd6dbd-72d9-469d-923c-0db612110301
nsStyleFont allocation: https://crash-stats.mozilla.com/report/index/7095dbb8-268f-4821-9459-8cc612110228
places -> nsACString: https://crash-stats.mozilla.com/report/index/e0ee2857-2b22-4205-8b9f-f855d2110226
various jit crashes: https://crash-stats.mozilla.com/report/index/d6b1aef5-3c49-41b4-8824-abd102110301 https://crash-stats.mozilla.com/report/index/6e76dfa9-035b-481f-b28c-067dd2110224 https://crash-stats.mozilla.com/report/index/6e76dfa9-035b-481f-b28c-067dd2110224