osx el-capitan, missing user account

Question

I came to work today and attempted to log into my imac(27 inch. late 2013) and got the incorrect password shake. Tried a few more times, but it was the same thing every time. Wat. In the end i was 100% sure that my password was correct and started getting worried. I then booted into recovery mode to reset my password, but the account in question was not in the list. Only root and guest were there. More wat. Getting more and more worried i booted into single user mode to check if my files were there at least. And yes. The /Users/username folder was there, but the owner was set to 501. The same group was set, but my account was not the owner anymore. At this point i&#x27;m in panic/confuse mode and googling frantically on my windows box. What is going on? I couldn&#x27;t really find anything.. Anyone with stronger google-fu than i have, please point me to what you could find.I attempt to reset my password in singleuser mode. ( passwd username ).... No such username.. So i give up getting my old account back. It seems to be gone. I reboot and login as root. This seems to crash/hang a few times before i get in( i forced a few reboots). But i&#x27;m in. Still in system preferences &gt; user and groups my account is nowhere to be found. So i create a new account with the same name. It asks me if i want to use the existing folder, i do, and it creates the account in a few minutes( time was spent chown&#x27;ing it seems). I reboot and log into the new-old account and the finder windows open as they would have in my old account. I start iterm and the empty window structure i know so well is there. This is clearly my old account. The keychain spam is real. something something does not exist. Reset? Yes. Yes. Yes.I now don&#x27;t trust my mac at all. I start backing up anything i don&#x27;t think i already have backed up and might want in the future before i reset. Also all logs and crash-reports etc. While thats going on its time attempt to figure out what happened. I have a few applications that log at hourly intervals running and they seem to have run up to about an hour before i attempted to login this morning. So it was running at that point. There are also a lot of crash reports from various osx processes. Some of these are empty files ( or more precisely files with only zeros. like 50K of just zeroes), but some contain stack traces. The first one since i left the machine alone seems to be mdworker that crashed at 000700 and again 20 seconds later. Both 50ish K of zeroes.Then a lof of mds_stores that continue crashing on 5 min intervals for about an hour. Mostly just zeroes but a few have traces like below:Thread 7 Crashed:: Dispatch queue: com.apple.metadata.spotlightindex.Set Attributes scheduler for index at /.Spotlight-V100/Store-V2/449EA84F-858B-4884-A867-CB0920   com.apple.spotlight.index     0x00007fff903a1324 si_writeBackAndIndex + 74581   com.apple.spotlight.index     0x00007fff902be952 setAttributes + 81162   com.apple.spotlight.index     0x00007fff902d4f1c runLoop + 1093   com.apple.spotlight.index     0x00007fff902e8141 work_fun + 6914   libdispatch.dylib             0x00007fff8b8a7324 _dispatch_block_async_invoke_and_release + 6105   libdispatch.dylib             0x00007fff8b88f453 _dispatch_client_callout + 86   libdispatch.dylib             0x00007fff8b894083 _dispatch_queue_drain + 7547   libdispatch.dylib             0x00007fff8b89a6c9 _dispatch_queue_invoke + 5498   libdispatch.dylib             0x00007fff8b894248 _dispatch_queue_drain + 12079   libdispatch.dylib             0x00007fff8b89a6c9 _dispatch_queue_invoke + 54910  libdispatch.dylib             0x00007fff8b894248 _dispatch_queue_drain + 120711  libdispatch.dylib             0x00007fff8b89a6c9 _dispatch_queue_invoke + 54912  libdispatch.dylib             0x00007fff8b892d9b _dispatch_root_queue_drain + 53813  libdispatch.dylib             0x00007fff8b892b48 _dispatch_worker_thread3 + 9114  libsystem_pthread.dylib       0x00007fff8ed814f2 _pthread_wqthread + 112915  libsystem_pthread.dylib       0x00007fff8ed7f375 start_wqthread + 13lsd crashed quite a few times through the night aswell. Again, mostly zeroes, but a few traces like this one:Thread 3 Crashed:: Dispatch queue: com.apple.lsd.database0   com.apple.LaunchServices       0x00007fff92cbba3a _UTTypeRemove + 511   com.apple.LaunchServices       0x00007fff92c7d772 _LSBundleRemove + 4592   com.apple.LaunchServices       0x00007fff92c9d8dc _LSServerItemInfoRegistration + 19053   com.apple.LaunchServices       0x00007fff92ca46eb _LSServer_RegisterItemInfo + 3614   com.apple.LaunchServices       0x00007fff92c3141c -[LSDXPCServer registerItemWithRegistrationInfo:alias:diskImageAlias:containerAlias:plist:inst allationDict:extraItems:withReply:] + 995   com.apple.LaunchServices       0x00007fff92c31e4c __55-[LSDXPCServer registerItemInfo:withConnection:Action:]_block_invoke + 986   libdispatch.dylib             0x00007fff8b89a8ff _dispatch_call_block_and_release + 127   libdispatch.dylib             0x00007fff8b88f453 _dispatch_client_callout + 88   libdispatch.dylib             0x00007fff8b894083 _dispatch_queue_drain + 7549   libdispatch.dylib             0x00007fff8b89a6c9 _dispatch_queue_invoke + 54910  libdispatch.dylib             0x00007fff8b892d9b _dispatch_root_queue_drain + 53811  libdispatch.dylib             0x00007fff8b892b48 _dispatch_worker_thread3 + 9112  libsystem_pthread.dylib       0x00007fff8ed814f2 _pthread_wqthread + 112913  libsystem_pthread.dylib       0x00007fff8ed7f375 start_wqthread + 13ditto for apsd:Thread 4 Crashed:: Dispatch queue: com.apple.CSDBThreadedRecordStore.recordStoreQueue.APSMessageStore0   libsystem_kernel.dylib         0x00007fff8c0940ae __pthread_kill + 101   libsystem_pthread.dylib       0x00007fff8ed84500 pthread_kill + 902   libsystem_c.dylib             0x00007fff947e037b abort + 1293   com.apple.CoreSDB             0x00007fff8dd74981 0x7fff8dd6b000 + 392974   com.apple.CoreSDB             0x00007fff8dd76812 0x7fff8dd6b000 + 471225   com.apple.CoreSDB             0x00007fff8dd72289 0x7fff8dd6b000 + 293216   com.apple.CoreSDB             0x00007fff8dd711ce CSDBSqliteDatabaseConnectionForWriting + 1207   com.apple.CoreSDB             0x00007fff8dd77ff3 0x7fff8dd6b000 + 532358   libdispatch.dylib             0x00007fff8b88f453 _dispatch_client_callout + 89   libdispatch.dylib             0x00007fff8b890a3a _dispatch_barrier_sync_f_invoke + 7410  com.apple.CoreSDB             0x00007fff8dd77d35 0x7fff8dd6b000 + 5253311  com.apple.CoreSDB             0x00007fff8dd77353 CSDBThreadedRecordStoreEnsureDatabaseSetup + 7812  apsd                           0x00000001037bbbe4 0x10378c000 + 19555613  apsd                           0x00000001037c4381 0x10378c000 + 23027314  com.apple.CoreSDB             0x00007fff8dd78493 0x7fff8dd6b000 + 5441915  libdispatch.dylib             0x00007fff8b89a8ff _dispatch_call_block_and_release + 1216  libdispatch.dylib             0x00007fff8b88f453 _dispatch_client_callout + 817  libdispatch.dylib             0x00007fff8b894083 _dispatch_queue_drain + 75418  libdispatch.dylib             0x00007fff8b89a6c9 _dispatch_queue_invoke + 54919  libdispatch.dylib             0x00007fff8b892d9b _dispatch_root_queue_drain + 53820  libdispatch.dylib             0x00007fff8b892b48 _dispatch_worker_thread3 + 9121  libsystem_pthread.dylib       0x00007fff8ed814f2 _pthread_wqthread + 112922  libsystem_pthread.dylib       0x00007fff8ed7f375 start_wqthread + 13The most interesting one i guess is identityserviced that crashed twice. Once with a stack trace and once with non-ascii data.Crashed Thread:        6  Dispatch queue: com.apple.CSDBThreadedRecordStore.recordStoreQueue.IDSMessageStoreException Type:        EXC_CRASH (SIGABRT)Exception Codes:       0x0000000000000000, 0x0000000000000000Exception Note:        EXC_CORPSE_NOTIFYApplication Specific Information:abort() calledGlobal Trace Buffer (reverse chronological seconds):1403.724734  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9d38fa0) failed1403.724763  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9d1a460) failed1403.724787  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9d38fa0) failed1403.724810  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9d1a460) failed1403.724850  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9d1a460) failed1403.724874  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9d1a460) failed1403.724951  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9f425a0) failed1403.724981  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9f425a0) failed1405.033408  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9c2d170) failed1405.033408  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9c2d170) failed1405.033443  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9c2d170) failed1405.033505  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9c2d170) failed1405.033512  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9c2d170) failed1405.033583  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9c2d170) failed1405.033655  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e0a2c0) failed1405.033691  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.033748  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.033748  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.033787  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e51710) failed1405.033884  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.034699  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.034705  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.034736  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9c43230) failed1405.034765  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9c43230) failed1405.034807  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9c43230) failed1405.034858  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e51710) failed1405.034885  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e51710) failed1405.034917  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e51710) failed1405.034984  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e0a2c0) failed1405.035027  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e51710) failed1405.036969  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9f33f30) failed1405.037020  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9f18d60) failed1405.277207  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9f18d60) failed1405.277245  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.277268  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.277308  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.277331  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.277366  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.277392  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.277449  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e0a2c0) failed1405.277471  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e0a2c0) failed1405.277507  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.277584  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.277607  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.277640  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.277679  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e0a2c0) failed1405.277799  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9d1a460) failed1405.277847  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9d1a460) failed1405.277936  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9f425a0) failed1405.277981  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e35710) failed1405.278033  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e119f0) failed1405.278103  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e2b430) failed1405.278145  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e2b430) failed1405.278561  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9d1a460) failed1405.278631  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e2b430) failed1405.278693  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e2b430) failed1405.278736  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failed1405.278802  libsystem_trace.dylib     0x00007fff887ac102 dyld_image_header_containing_address(0x7fe2a9e414f0) failedThread 6 Crashed:: Dispatch queue: com.apple.CSDBThreadedRecordStore.recordStoreQueue.IDSMessageStore0   libsystem_kernel.dylib         0x00007fff8c0940ae __pthread_kill + 101   libsystem_pthread.dylib       0x00007fff8ed84500 pthread_kill + 902   libsystem_c.dylib             0x00007fff947e037b abort + 1293   com.apple.CoreSDB             0x00007fff8dd74981 0x7fff8dd6b000 + 392974   com.apple.CoreSDB             0x00007fff8dd76812 0x7fff8dd6b000 + 471225   com.apple.CoreSDB             0x00007fff8dd72289 0x7fff8dd6b000 + 293216   com.apple.CoreSDB             0x00007fff8dd711ce CSDBSqliteDatabaseConnectionForWriting + 1207   com.apple.CoreSDB             0x00007fff8dd77ff3 0x7fff8dd6b000 + 532358   libdispatch.dylib             0x00007fff8b88f453 _dispatch_client_callout + 89   libdispatch.dylib             0x00007fff8b890a3a _dispatch_barrier_sync_f_invoke + 7410  com.apple.CoreSDB             0x00007fff8dd77d35 0x7fff8dd6b000 + 5253311  com.apple.CoreSDB             0x00007fff8dd773ab CSDBThreadedRecordStoreEnsureDatabaseSetupWithProtection + 8112  com.apple.identityservicesd   0x000000010c84f8dd 0x10c6e1000 + 150140513  com.apple.identityservicesd   0x000000010c80d1d3 0x10c6e1000 + 122926714  com.apple.identityservicesd   0x000000010c80fe41 0x10c6e1000 + 124064115  com.apple.CoreSDB             0x00007fff8dd78493 0x7fff8dd6b000 + 5441916  libdispatch.dylib             0x00007fff8b88f453 _dispatch_client_callout + 817  libdispatch.dylib             0x00007fff8b89db20 _dispatch_barrier_sync_f_slow + 85618  com.apple.CoreSDB             0x00007fff8dd78478 0x7fff8dd6b000 + 5439219  com.apple.identityservicesd   0x000000010c80fe1e 0x10c6e1000 + 124060620  com.apple.identityservicesd   0x000000010c80d16c 0x10c6e1000 + 122916421  com.apple.identityservicesd   0x000000010c8282f9 0x10c6e1000 + 134015322  libdispatch.dylib             0x00007fff8b88f453 _dispatch_client_callout + 823  libdispatch.dylib             0x00007fff8b89f675 _dispatch_source_latch_and_call + 223524  libdispatch.dylib             0x00007fff8b893acb _dispatch_source_invoke + 98325  libdispatch.dylib             0x00007fff8b894248 _dispatch_queue_drain + 120726  libdispatch.dylib             0x00007fff8b89a6c9 _dispatch_queue_invoke + 54927  libdispatch.dylib             0x00007fff8b892d9b _dispatch_root_queue_drain + 53828  libdispatch.dylib             0x00007fff8b892b48 _dispatch_worker_thread3 + 9129  libsystem_pthread.dylib       0x00007fff8ed814f2 _pthread_wqthread + 112930  libsystem_pthread.dylib       0x00007fff8ed7f375 start_wqthread + 13&#x3D;&#x3D;&#x3D;&#x3D;0005 1607 0002 0000 4d61 6320 4f53 20582020 2020 2020 2020 0002 0000 0009 00000032 0000 01a5 0000 0002 0000 01d7 00000000 0000 0000 0000 0000 0000 0000 00000000 0000 0000 0000 0000 0000 0000 00000000 0000 4154 5452 0000 0000 0000 01d70000 0154 0000 0083 0000 0000 0000 00000000 0000 0000 0009 0000 0154 0000 00040000 1261 7070 5f62 7569 6c64 5f76 65727369 6f6e 0000 0000 0000 0158 0000 002a0000 1061 7070 5f64 6573 6372 6970 74696f6e 0000 0000 0182 0000 0004 0000 0c617070 5f76 6572 7369 6f6e 0000 0000 01860000 0001 0000 0962 7567 5f74 7970 65000000 0187 0000 0002 0000 1164 6961 6c6f675f 6469 7370 6c61 7965 6400 0000 01890000 0011 0000 0c64 6973 706c 6179 4e616d65 0000 0000 019a 0000 0011 0000 056e616d 6500 0000 01ab 0000 000c 0000 0b6f735f 7665 7273 696f 6e00 0000 0000 01b70000 0020 0000 0c70 7265 7369 675f 68617368 0000 3130 3030 6964 656e 7469 74797365 7276 6963 6573 645b 3431 335d 20766572 7369 6f6e 2031 302e 3020 2831 30303029 3130 2e30 394e 4f69 6465 6e74 69747973 6572 7669 6365 7364 6964 656e 74697479 7365 7276 6963 6573 6431 302e 31313a31 3541 3238 3441 3535 3145 3343 44363335 4244 4438 4445 4345 4336 3846 31363531 3546 3437 36Both at the same time 015900.Then in the morning when i logged in it seems lsd crashed once every minute. mostly zeroes but some traces:Crashed Thread:        0  Dispatch queue: com.apple.main-threadException Type:        EXC_BAD_ACCESS (SIGSEGV)Exception Codes:       KERN_INVALID_ADDRESS at 0x00000001fb35624aException Note:        EXC_CORPSE_NOTIFYVM Regions Near 0x1fb35624a:    VM_ALLOCATE            0000000102e0b000-0000000102e0c000 [    4K] rw-/rwx SM&#x3D;ALI  --&gt;     MALLOC_TINY            00007fcc68400000-00007fcc68700000 [ 3072K] rw-/rwx SM&#x3D;PRV  Thread 0 Crashed:: Dispatch queue: com.apple.main-thread0   com.apple.LaunchServices       0x00007fff92c3f9c1 _FreeSegValidateLength + 211   com.apple.LaunchServices       0x00007fff92c4079e _CSStoreValidateTable + 11642   com.apple.LaunchServices       0x00007fff92c40105 _CSStoreValidate + 3163   com.apple.LaunchServices       0x00007fff92c83934 ___ZL34_LSPerformOneTimePerfectValidationPK9__CSStore_block_invoke + 324   libdispatch.dylib             0x00007fff8b88f453 _dispatch_client_callout + 85   libdispatch.dylib             0x00007fff8b88f34b dispatch_once_f + 676   com.apple.LaunchServices       0x00007fff92c821a6 _LSCreateStoreWithFileContents(char const*, __CSStore const**) + 4227   com.apple.LaunchServices       0x00007fff92c82253 _LSDatabaseCreateFromPersistentStore + 1198   com.apple.LaunchServices       0x00007fff92c60935 -[LSDatabaseBuilder createAndSeedLocalDatabase:] + 539   com.apple.LaunchServices       0x00007fff92c2d409 -[LSServerDelegate beginListening] + 17210  com.apple.LaunchServices       0x00007fff92c2f056 _LSServerMain + 17511  libdyld.dylib                 0x00007fff90c815ad start + 1Thread 0 crashed with X86 Thread State (64-bit):  rax: 0x0000000000060001  rbx: 0x00000000000a0000  rcx: 0x00000000000600b0  rdx: 0x00000000f880c24e  rdi: 0x0000000102b4a000  rsi: 0x00000000000600b0  rbp: 0x00007fff5d3bd330  rsp: 0x00007fff5d3bd330   r8: 0x0000000000000000   r9: 0x000000000010703c  r10: 0x00007fcc6860b260  r11: 0x0000000000000246  r12: 0x0000000102aaa000  r13: 0x00000000000600b0  r14: 0x000000000005e044  r15: 0x0000000102b4a000  rip: 0x00007fff92c3f9c1  rfl: 0x0000000000010206  cr2: 0x00000001fb35624aThey mostly seem to be related to calls about, or connected to, the filesystem. I also booted into single-user a few times and it could randomly hang on "still waiting for root device". I do get in like 2/3 times. So i&#x27;m guessing (again) that this is the harddrive thats failing or somesuch. fsck doesn&#x27;t report any errors though. In the end i&#x27;m able to login and &#x27;use&#x27; it again. But there are a lot of random beachballs on applications from time to time. For instance when shutting down almost everything will beachball. mds_stores and mdworker are working hard. Even the activity monitor will beachball in the end. So i&#x27;m replacing it. I would just really like to know what happened. If my user was actually bricked due to a hardware failure. So, anyone?

Anthony Hildebrandt · Answer

I have been seeing the same crash log as you posted above starting towards the bottom:&gt;&gt;Exception Type:        EXC_BAD_ACCESS (SIGSEGV)Exception Codes:       KERN_INVALID_ADDRESS at 0x00000001fb35624aException Note:        EXC_CORPSE_NOTIFYVM Regions Near 0x1fb35624a:    VM_ALLOCATE            0000000102e0b000-0000000102e0c000 [    4K] rw-/rwx SM&#x3D;ALI--&gt;    MALLOC_TINY            00007fcc68400000-00007fcc68700000 [ 3072K] rw-/rwx SM&#x3D;PRVThread 0 Crashed:: Dispatch queue: com.apple.main-thread0   com.apple.LaunchServices       0x00007fff92c3f9c1 _FreeSegValidateLength + 211   ...&lt;&lt;I have replaced the hard drive, and the RAM.  I have tried restoring from an older Time Machine save point... I have gone into diagnostics mode, and done an extended hardware test.  The test came back with no errors.  I performed a file system repair (fsck -fy) and it claimed to modify some system files for me.  But no matter what I do, I always get half way through boot, and it hangs.So, in my mind, I have ruled out:- Hard Drive- RAMWhat I am suspicious of:- File system corruption- Main Board failure- (More specifically) Hard Drive Controller on Main BoardI am not sure what the FreeSegValidateLength call is in my crash report.  I did a search for it, and found this post here as the only result in my request results.  So, I am not sure what it is, what it does, and how to make it happy.  It smells of memory and memory management.  I am assuming it is a segment validator, possibly doing a pre-flight check on the hard drive or RAM, and it can&#x27;t complete safely.I have been working on ways to just log in.  I have not seen a log in screen in days.  Recovery Mode gets me the recovery interface... and Single User Mode gets me access to a terminal interface.  I can traverse the file system in both, but I have not seen a successful boot to a user no matter what I try.  I am using El Capitan on a MacBookPro9,2 (2012 Mac Book Pro 12" / USB3)This has been a sturdy MacBook... I really don&#x27;t want to have to replace it.  It was the last form factor I really enjoyed, having RJ45 and a built in SuperDrive.  If anyone can lend support to this thread, please, I am really hopeful to get this machine back in production.

Eric Root · Answer

Startup Issues - ResolveStartup Issues - Resolve (2)Startup Issues - Resolve (3)