[Bug 4979] New: dirstate corruption causes appcrash

[mercurial-bugs at selenic.com]

https://bz.mercurial-scm.org/show_bug.cgi?id=4979

            Bug ID: 4979
           Summary: dirstate corruption causes appcrash
           Product: Mercurial
           Version: 3.6.1
          Hardware: PC
                OS: Windows
            Status: UNCONFIRMED
          Severity: bug
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at selenic.com
          Reporter: kubelsmieci at gmail.com
                CC: mercurial-devel at selenic.com

Created attachment 1880
  --> https://bz.mercurial-scm.org/attachment.cgi?id=1880&action=edit
corrupted dirstate file

Somehow (probably failed restore from hibernated system) my 'dirstate' file was
corrupted: 190kB with only 0x00 bytes in all file.

Any 'hg' command causes hg.exe to crash:
        ========================
                Podpis problemu:
                  Nazwa zdarzenia problemu:     APPCRASH
                  Nazwa aplikacji:      hg.exe
                  Wersja aplikacji:     3.6.1.0
                  Sygnatura czasowa aplikacji:  4918017b
                  Nazwa modułu z błędem:        MSVCR90.dll
                  Wersja modułu z błędem:       9.0.30729.6161
                  Sygnatura czasowa modułu z błędem:    4dace4e7
                  Kod wyjÄ…tku:  c0000005
                  Przesunięcie wyjątku: 000000000001e51d
                  Wersja systemu operacyjnego:  6.1.7601.2.1.0.256.48
                  Identyfikator ustawień regionalnych:  1045
                  Dodatkowe informacje 1:       2ad9
                  Dodatkowe informacje 2:      
2ad922288d1197cb0e39ebfca1c9763d
                  Dodatkowe informacje 3:       5787
                  Dodatkowe informacje 4:      
5787facdad846807ec2517374d75d1a1
        ========================
'hg debugrebuildstate -r tip' also causes appcrash.

Only 'hg clone' from outside of repo worked. Cloned repo worked.

Deleting 'dirstate' from broken repo - hg commands stopped crashed, but working
directory is broken:
        ========================
                λ hg sum
                parent: -1:000000000000  (no revision checked out)
                branch: sralgs
                commit: 2830 unknown (new branch)
                update: 6227 new changesets (update)
                phases: 1034 draft
        ========================
(I understate this is expected)

After copied 'dirstate' from cloned repo to broken repo, working directory
seems ok:
        ========================
                λ hg sum
                parent: 6569:0b005c2a028c tip
                 my last commit message
                branch: sralgs
                commit: 1 modified
                update: (current)
                phases: 1034 draft
        ========================
                λ hg verify -v                                    
                repository uses revlog format 1                   
                checking changesets                               
                checking manifests                                
                crosschecking files in changesets and manifests   
                checking files                                    
                8843 files, 6570 changesets, 28581 total revisions
        ========================

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