[Bug glob/22183] New: commit 5554304f0ddd ("posix: Allow glob to match dangling symlinks") cause "make" segfaults

["markus at trippelsdorf dot de" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22183

            Bug ID: 22183
           Summary: commit 5554304f0ddd ("posix: Allow glob to match
                    dangling symlinks") cause "make" segfaults
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: critical
          Priority: P2
         Component: glob
          Assignee: unassigned at sourceware dot org
          Reporter: markus at trippelsdorf dot de
                CC: adhemerval.zanella at linaro dot org
  Target Milestone: ---

Since:

commit 5554304f0dddf75dc27cc6250fc53355161fd16a                                 
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>                      
Date:   Mon Sep 4 16:22:28 2017 -0300       

    posix: Allow glob to match dangling symlinks [BZ #866] 

I get, e.g.:

markus@x4 linux % make
[1]    303 segmentation fault  nice -n 19 make

...
52590 8275  openat(AT_FDCWD, "/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3          
52591 8275  read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@q\2\0\0\0\0\0"..., 832) = 832   
52592 8275  fstat(3, {st_mode=S_IFREG|0755, st_size=16657728, ...}) = 0         
52593 8275  mmap(NULL, 1779696, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE,
3, 0) = 0x7f3861552000                                                          
52594 8275  mprotect(0x7f38616fa000, 4096, PROT_NONE) = 0                       
52595 8275  mmap(0x7f38616fb000, 24576, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a8000) = 0x7f38616fb000              
52596 8275  mmap(0x7f3861701000, 14320, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f3861701000                    
52597 8275  close(3)                          = 0                               
52598 8275  mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x7f386154f000                                                         
52599 8275  arch_prctl(ARCH_SET_FS, 0x7f386154f740) = 0                         
52600 8275  mprotect(0x7f38616fb000, 12288, PROT_READ) = 0                      
52601 8275  mprotect(0x414000, 4096, PROT_READ) = 0                             
52602 8275  mprotect(0x7f386175a000, 4096, PROT_READ) = 0                       
52603 8275  munmap(0x7f3861705000, 171226)    = 0                               
52604 8275  brk(NULL)                         = 0x1fba000                       
52605 8275  brk(0x1fdb000)                    = 0x1fdb000                       
52606 8275  openat(AT_FDCWD, "/usr/lib/locale/locale-archive",
O_RDONLY|O_CLOEXEC) = 3                                                         
52607 8275  fstat(3, {st_mode=S_IFREG|0644, st_size=3155424, ...}) = 0          
52608 8275  mmap(NULL, 3155424, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f386124c000  
52609 8275  close(3)                          = 0                               
52610 8275  ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0           
52611 8275  newfstatat(AT_FDCWD, ".8267.tmp", 0x1fbc5b8, AT_SYMLINK_NOFOLLOW) =
-1 ENOENT (No such file or directory)                                           
52612 8275  unlinkat(AT_FDCWD, ".8267.tmp", 0) = -1 ENOENT (No such file or
directory)                                                                      
52613 8275  newfstatat(AT_FDCWD, ".8267.o", 0x1fbc6d8, AT_SYMLINK_NOFOLLOW) =
-1 ENOENT (No such file or directory)                                           
52614 8275  unlinkat(AT_FDCWD, ".8267.o", 0)  = -1 ENOENT (No such file or
directory)                                                                      
52615 8275  lseek(0, 0, SEEK_CUR)             = -1 ESPIPE (Illegal seek)        
52616 8275  close(0)                          = 0                               
52617 8275  close(1)                          = 0                               
52618 8275  close(2)                          = 0                               
52619 8275  exit_group(0)                     = ?                               
52620 8275  +++ exited with 0 +++                                               
52621 8267  <... wait4 resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0,
NULL) = 8275                                                                    
52622 8267  rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[],
sa_flags=SA_RESTORER, sa_restorer=0x7fc196ed8070}, {sa_handler=0x43ca80,
sa_mask=[], sa_flags=SA_RESTORER, sa_res      torer=0x7fc196ed8070}, 8) = 0     
52623 8267  rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0                        
52624 8267  --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=8275,
si_uid=1000, si_status=0, si_utime=0, si_stime=0} ---                           
52625 8267  wait4(-1, 0x7ffdd4d28a58, WNOHANG, NULL) = -1 ECHILD (No child
processes)                                                                      
52626 8267  rt_sigreturn({mask=[]})           = 0                               
52627 8267  rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0                        
52628 8267  rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0                        
52629 8267  exit_group(0)                     = ?                               
52630 8267  +++ exited with 0 +++                                               
52631 7948  <... read resumed> "", 198)       = 0                               
52632 7948  close(4)                          = 0                               
52633 7948  wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 8267  
52634 7948  read(3, "rch/$(SRCARCH)/kernel/vmlinux.ld"..., 4096) = 4096         
52635 7948  --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0xc8}
---                                                                             
52636 7948  +++ killed by SIGSEGV +++

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