Re: backup manifests - Mailing list pgsql-hackers

Another scenario, in which if we modify Manifest-Checksum" value from 
backup_manifest file , we are not getting an error

[centos@tushar-ldap-docker bin]$ ./pg_validatebackup data/
pg_validatebackup: * manifest_checksum = 
28d082921650d0ae881de8ceb122c8d2af5f449f51ecfb446827f7f49f91f65d
pg_validatebackup: backup successfully verified

open backup_manifest file and replace

"Manifest-Checksum": 
"8d082921650d0ae881de8ceb122c8d2af5f449f51ecfb446827f7f49f91f65d"}
with
"Manifest-Checksum": "Hello World"}

rerun the pg_validatebackup

[centos@tushar-ldap-docker bin]$ ./pg_validatebackup data/
pg_validatebackup: * manifest_checksum = Hello World
pg_validatebackup: backup successfully verified

regards,

On 3/4/20 3:26 PM, tushar wrote:
> Hi,
> Another observation , if i change the ownership of a file which is 
> under global/ directory
> i.e
>
> [root@tushar-ldap-docker global]# chown enterprisedb 2396
>
> and run the pg_validatebackup command, i am getting this message -
>
> [centos@tushar-ldap-docker bin]$ ./pg_validatebackup gggg
> pg_validatebackup: * manifest_checksum = 
> e8cb007bcc9c0deab6eff51cd8d9d9af6af35b86e02f3055e60e70e56737e877
> pg_validatebackup: error: could not open file "global/2396": 
> Permission denied
> *** Error in `./pg_validatebackup': double free or corruption (!prev): 
> 0x0000000001850ba0 ***
> ======= Backtrace: =========
> /lib64/libc.so.6(+0x81679)[0x7fa2248e3679]
> ./pg_validatebackup[0x401f4c]
> /lib64/libc.so.6(__libc_start_main+0xf5)[0x7fa224884505]
> ./pg_validatebackup[0x402049]
> ======= Memory map: ========
> 00400000-00415000 r-xp 00000000 fd:03 4044545 
> /home/centos/pg13_bk_mani/edb/edbpsql/bin/pg_validatebackup
> 00614000-00615000 r--p 00014000 fd:03 4044545 
> /home/centos/pg13_bk_mani/edb/edbpsql/bin/pg_validatebackup
> 00615000-00616000 rw-p 00015000 fd:03 4044545 
> /home/centos/pg13_bk_mani/edb/edbpsql/bin/pg_validatebackup
> 017f3000-01878000 rw-p 00000000 00:00 
> 0                                  [heap]
> 7fa218000000-7fa218021000 rw-p 00000000 00:00 0
> 7fa218021000-7fa21c000000 ---p 00000000 00:00 0
> 7fa21e122000-7fa21e137000 r-xp 00000000 fd:03 
> 141697                     /usr/lib64/libgcc_s-4.8.5-20150702.so.1
> 7fa21e137000-7fa21e336000 ---p 00015000 fd:03 
> 141697                     /usr/lib64/libgcc_s-4.8.5-20150702.so.1
> 7fa21e336000-7fa21e337000 r--p 00014000 fd:03 
> 141697                     /usr/lib64/libgcc_s-4.8.5-20150702.so.1
> 7fa21e337000-7fa21e338000 rw-p 00015000 fd:03 
> 141697                     /usr/lib64/libgcc_s-4.8.5-20150702.so.1
> 7fa21e338000-7fa224862000 r--p 00000000 fd:03 
> 266442                     /usr/lib/locale/locale-archive
> 7fa224862000-7fa224a25000 r-xp 00000000 fd:03 
> 134456                     /usr/lib64/libc-2.17.so
> 7fa224a25000-7fa224c25000 ---p 001c3000 fd:03 
> 134456                     /usr/lib64/libc-2.17.so
> 7fa224c25000-7fa224c29000 r--p 001c3000 fd:03 
> 134456                     /usr/lib64/libc-2.17.so
> 7fa224c29000-7fa224c2b000 rw-p 001c7000 fd:03 
> 134456                     /usr/lib64/libc-2.17.so
> 7fa224c2b000-7fa224c30000 rw-p 00000000 00:00 0
> 7fa224c30000-7fa224c47000 r-xp 00000000 fd:03 
> 134485                     /usr/lib64/libpthread-2.17.so
> 7fa224c47000-7fa224e46000 ---p 00017000 fd:03 
> 134485                     /usr/lib64/libpthread-2.17.so
> 7fa224e46000-7fa224e47000 r--p 00016000 fd:03 
> 134485                     /usr/lib64/libpthread-2.17.so
> 7fa224e47000-7fa224e48000 rw-p 00017000 fd:03 
> 134485                     /usr/lib64/libpthread-2.17.so
> 7fa224e48000-7fa224e4c000 rw-p 00000000 00:00 0
> 7fa224e4c000-7fa224e90000 r-xp 00000000 fd:03 4044478 
> /home/centos/pg13_bk_mani/edb/edbpsql/lib/libpq.so.5.13
> 7fa224e90000-7fa225090000 ---p 00044000 fd:03 4044478 
> /home/centos/pg13_bk_mani/edb/edbpsql/lib/libpq.so.5.13
> 7fa225090000-7fa225093000 r--p 00044000 fd:03 4044478 
> /home/centos/pg13_bk_mani/edb/edbpsql/lib/libpq.so.5.13
> 7fa225093000-7fa225094000 rw-p 00047000 fd:03 4044478 
> /home/centos/pg13_bk_mani/edb/edbpsql/lib/libpq.so.5.13
> 7fa225094000-7fa2250b6000 r-xp 00000000 fd:03 
> 130333                     /usr/lib64/ld-2.17.so
> 7fa22527d000-7fa2252a2000 rw-p 00000000 00:00 0
> 7fa2252b3000-7fa2252b5000 rw-p 00000000 00:00 0
> 7fa2252b5000-7fa2252b6000 r--p 00021000 fd:03 
> 130333                     /usr/lib64/ld-2.17.so
> 7fa2252b6000-7fa2252b7000 rw-p 00022000 fd:03 
> 130333                     /usr/lib64/ld-2.17.so
> 7fa2252b7000-7fa2252b8000 rw-p 00000000 00:00 0
> 7ffdf354f000-7ffdf3570000 rw-p 00000000 00:00 
> 0                          [stack]
> 7ffdf3572000-7ffdf3574000 r-xp 00000000 00:00 
> 0                          [vdso]
> ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 
> 0                  [vsyscall]
> Aborted
> [centos@tushar-ldap-docker bin]$
>
>
> I am getting the error message but along with "*** Error in 
> `./pg_validatebackup': double free or corruption (!prev): 
> 0x0000000001850ba0 ***"  messages
>
> Is this expected ?
>
> regards,
>
> On 3/3/20 8:19 PM, tushar wrote:
>> On 3/3/20 4:04 PM, tushar wrote:
>>> Thanks Robert.  After applying all the 5 patches (v8-00*) against PG 
>>> v13 (commit id -afb5465e0cfce7637066eaaaeecab30b0f23fbe3) , 
>>
>> There is a scenario where pg_validatebackup is not throwing an error 
>> if some file deleted from pg_wal/ folder and  but later at the time 
>> of restoring - we are getting an error
>>
>> [centos@tushar-ldap-docker bin]$ ./pg_basebackup  -D test1
>>
>> [centos@tushar-ldap-docker bin]$ ls test1/pg_wal/
>> 000000010000000000000010  archive_status
>>
>> [centos@tushar-ldap-docker bin]$ rm -rf test1/pg_wal/*
>>
>> [centos@tushar-ldap-docker bin]$ ./pg_validatebackup test1
>> pg_validatebackup: * manifest_checksum = 
>> 88f1ed995c83e86252466a2c88b3e660a69cfc76c169991134b101c4f16c9df7
>> pg_validatebackup: backup successfully verified
>>
>> [centos@tushar-ldap-docker bin]$ ./pg_ctl -D test1 start -o '-p 3333'
>> waiting for server to start....2020-03-02 20:05:22.732 IST [21441] 
>> LOG:  starting PostgreSQL 13devel on x86_64-pc-linux-gnu, compiled by 
>> gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39), 64-bit
>> 2020-03-02 20:05:22.733 IST [21441] LOG:  listening on IPv6 address 
>> "::1", port 3333
>> 2020-03-02 20:05:22.733 IST [21441] LOG:  listening on IPv4 address 
>> "127.0.0.1", port 3333
>> 2020-03-02 20:05:22.736 IST [21441] LOG:  listening on Unix socket 
>> "/tmp/.s.PGSQL.3333"
>> 2020-03-02 20:05:22.739 IST [21442] LOG:  database system was 
>> interrupted; last known up at 2020-03-02 20:04:35 IST
>> 2020-03-02 20:05:22.739 IST [21442] LOG:  creating missing WAL 
>> directory "pg_wal/archive_status"
>> 2020-03-02 20:05:22.886 IST [21442] LOG:  invalid checkpoint record
>> 2020-03-02 20:05:22.886 IST [21442] FATAL:  could not locate required 
>> checkpoint record
>> 2020-03-02 20:05:22.886 IST [21442] HINT:  If you are restoring from 
>> a backup, touch 
>> "/home/centos/pg13_bk_mani/edb/edbpsql/bin/test1/recovery.signal" and 
>> add required recovery options.
>>     If you are not restoring from a backup, try removing the file 
>> "/home/centos/pg13_bk_mani/edb/edbpsql/bin/test1/backup_label".
>>     Be careful: removing 
>> "/home/centos/pg13_bk_mani/edb/edbpsql/bin/test1/backup_label" will 
>> result in a corrupt cluster if restoring from a backup.
>> 2020-03-02 20:05:22.886 IST [21441] LOG:  startup process (PID 21442) 
>> exited with exit code 1
>> 2020-03-02 20:05:22.886 IST [21441] LOG:  aborting startup due to 
>> startup process failure
>> 2020-03-02 20:05:22.889 IST [21441] LOG:  database system is shut down
>>  stopped waiting
>> pg_ctl: could not start server
>> Examine the log output.
>> [centos@tushar-ldap-docker bin]$
>>
>

-- 
regards,tushar
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