Re: dump/restore out of range inode

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On Sat, Jun 05, 2021 at 10:03:21AM -0000, Michael van Elst wrote:
> prlw1%cam.ac.uk@localhost (Patrick Welche) writes:
> 
> >How can gdb not see a spcl anywhere?
> 
> /usr/include/protocols/dumprestore.h:#define spcl u_spcl.s_spcl
> 
> spcl is just a define that got resolved by the compiler.

ach... here it is(gdb) print u_spcl.s_spcl

$2 = {c_type = 6, c_old_date = 0, c_old_ddate = 0, c_volume = 1, 
  c_old_tapea = 0, c_inumber = 397083647, c_magic = 424935705, 
  c_checksum = 1906085926, __c_ino = {__uc_dinode = {di_mode = 0, 
      di_nlink = 0, di_oldids = {0, 0}, di_size = 0, di_atime = 0, 
      di_atimensec = 0, di_mtime = 0, di_mtimensec = 0, di_ctime = 0, 
      di_ctimensec = 0, di_db = {0 <repeats 12 times>}, di_ib = {0, 0, 0}, 
      di_flags = 0, di_blocks = 0, di_gen = 0, di_uid = 0, di_gid = 0, 
      di_modrev = 0}, __uc_ino = {__uc_mode = 0, __uc_spare1 = {0, 0, 0}, 
      __uc_size = 0, __uc_old_atime = 0, __uc_atimensec = 0, 
      __uc_old_mtime = 0, __uc_mtimensec = 0, __uc_spare2 = {0, 0}, 
      __uc_rdev = 0, __uc_birthtimensec = 0, __uc_birthtime = 0, 
      __uc_atime = 0, __uc_mtime = 0, __uc_spare4 = {0, 0, 0, 0, 0, 0, 0}, 
      __uc_file_flags = 0, __uc_spare5 = {0, 0}, __uc_uid = 0, __uc_gid = 0, 
      __uc_spare6 = {0, 0}}}, c_count = 48473, 
  c_addr = '\000' <repeats 511 times>, 
  c_label = "none", '\000' <repeats 11 times>, c_level = 0, 
  c_filesys = "/store/backup", '\000' <repeats 50 times>, 
  c_dev = "/dev/rdk18", '\000' <repeats 53 times>, 
  c_host = "quantz", '\000' <repeats 57 times>, c_flags = 2, 
  c_old_firstrec = 0, c_date = 1622887657, c_ddate = 0, c_tapea = 10, 
  c_firstrec = 0, c_spare = {0 <repeats 24 times>}}
(gdb) bt
#0  flushtape () at /usr/src/sbin/dump/tape.c:333
#1  0x000000000020763e in writerec (dp=dp@entry=0x7f7ff3a01380 "", 
    isspcl=isspcl@entry=0) at /usr/src/sbin/dump/tape.c:168
#2  0x0000000000208e49 in dumpmap (map=<optimized out>, type=type@entry=6, 
    ino=ino@entry=397083647) at /usr/src/sbin/dump/traverse.c:716
#3  0x000000000020b355 in main (argc=1, argv=0x7f7fffffe7e8)
    at /usr/src/sbin/dump/main.c:646
(gdb) list
328             }
329     
330             blks = 0;
331             if (iswap32(spcl.c_type) != TS_END) {
332                     for (i = 0; i < iswap32(spcl.c_count); i++)
333                             if (spcl.c_addr[i] != 0)
334                                     blks++;
335             }
336             slp->count = lastspclrec + blks + 1 - iswap64(spcl.c_tapea);
337             slp->tapea = iswap64(spcl.c_tapea);
(gdb) print i
$6 = <optimized out>
(gdb) print u_spcl.s_spcl.c_count  
$7 = 48473
(gdb) whatis u_spcl.s_spcl.c_addr
type = char [512]

so guess optimized_out i >> 512

c_type==6 = TS_CLRI map of inodes deleted since last dump

(a bit odd:
(gdb) print needswap
$11 = 0
(gdb) print iswap32(u_spcl.s_spcl.c_count)
$10 = 1505558528
)

Still puzzled...


Cheers,

Patrick