[Bugs] [Bug 1717757] New: BItrot: Segmentation Fault if bitrot stub do signature

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1717757

            Bug ID: 1717757
           Summary: BItrot: Segmentation Fault if bitrot stub do signature
           Product: GlusterFS
           Version: 5
            Status: NEW
         Component: bitrot
          Assignee: bugs at gluster.org
          Reporter: david.spisla at iternity.com
                CC: bugs at gluster.org
  Target Milestone: ---
    Classification: Community
      Docs Contact: bugs at gluster.org



Created attachment 1577785
  --> https://bugzilla.redhat.com/attachment.cgi?id=1577785&action=edit
backtrace of /usr/sbin/glusterfsd

Description of problem:

Setup: 2-Node VM Cluster with a Replica 2 Volume
After doing several "wild" write and delete operations from a Win Client, one
of the brick crashes. The crash report says:

[2019-06-05 09:05:05.137156] I [MSGID: 139001]
[posix-acl.c:263:posix_acl_log_permit_denied] 0-archive1-access-control:
client: CTX_ID:fcab5e67-b9d9-4b72-8c15-f29de2084af3-GRAPH_ID:0-PID:189
16-HOST:fs-detlefh-c1-n2-PC_NAME:archive1-client-0-RECON_NO:-0, gfid:
494b42ad-7e40-4e27-8878-99387a80b5dc, req(uid:2000,gid:2000,perm:3,ngrps:1),
ctx(uid:0,gid:0,in-groups:0,perm:755,update
d-fop:LOOKUP, acl:-) [Permission denied]
pending frames:
frame : type(0) op(0)
frame : type(0) op(23)
patchset: git://git.gluster.org/glusterfs.git
signal received: 11
time of crash: 
2019-06-05 09:05:05
configuration details:
argp 1
backtrace 1
dlfcn 1
libpthread 1
llistxattr 1
setfsid 1
spinlock 1
epoll.h 1
xattr.h 1
st_atim.tv_nsec 1
package-string: glusterfs 5.5
/usr/lib64/libglusterfs.so.0(+0x2764c)[0x7f89faa7264c]
/usr/lib64/libglusterfs.so.0(gf_print_trace+0x306)[0x7f89faa7cd26]
/lib64/libc.so.6(+0x361a0)[0x7f89f9c391a0]
/usr/lib64/glusterfs/5.5/xlator/features/bitrot-stub.so(+0x13441)[0x7f89f22ae441]
/usr/lib64/libglusterfs.so.0(default_fsetxattr+0xce)[0x7f89faaf9f8e]
/usr/lib64/glusterfs/5.5/xlator/features/locks.so(+0x22636)[0x7f89f1e68636]
/usr/lib64/libglusterfs.so.0(default_fsetxattr+0xce)[0x7f89faaf9f8e]
/usr/lib64/libglusterfs.so.0(syncop_fsetxattr+0x26b)[0x7f89faab319b]
/usr/lib64/glusterfs/5.5/xlator/features/worm.so(+0xa901)[0x7f89f1c3d901]
/usr/lib64/glusterfs/5.5/xlator/features/locks.so(+0x11b66)[0x7f89f1e57b66]
/usr/lib64/glusterfs/5.5/xlator/features/access-control.so(+0xaebe)[0x7f89f208febe]
/usr/lib64/glusterfs/5.5/xlator/features/locks.so(+0xb081)[0x7f89f1e51081]
/usr/lib64/glusterfs/5.5/xlator/features/worm.so(+0x8c23)[0x7f89f1c3bc23]
/usr/lib64/glusterfs/5.5/xlator/features/read-only.so(+0x4e30)[0x7f89f1a2de30]
/usr/lib64/glusterfs/5.5/xlator/features/leases.so(+0xa444)[0x7f89f181b444]
/usr/lib64/glusterfs/5.5/xlator/features/upcall.so(+0x10a68)[0x7f89f1600a68]
/usr/lib64/libglusterfs.so.0(default_create_resume+0x212)[0x7f89fab10132]
/usr/lib64/libglusterfs.so.0(call_resume_wind+0x2cf)[0x7f89faa97e5f]
/usr/lib64/libglusterfs.so.0(call_resume+0x75)[0x7f89faa983a5]
/usr/lib64/glusterfs/5.5/xlator/performance/io-threads.so(+0x6088)[0x7f89f13e7088]
/lib64/libpthread.so.0(+0x7569)[0x7f89f9fc4569]
/lib64/libc.so.6(clone+0x3f)[0x7f89f9cfb9af]
---------

Version-Release number of selected component (if applicable): v5.5


Additional info:

The backtrace shows that there is a Nulllpointer for *fd in br_stub_fsetxattr:
Thread 1 (Thread 0x7f89f0099700 (LWP 2171)):
#0  br_stub_fsetxattr (frame=0x7f89b846a6e8, this=0x7f89ec015c00, fd=0x0,
dict=0x7f89b84e9ad8, flags=0, xdata=0x0) at bit-rot-stub.c:1328
        ret = 0
        val = 0
        sign = 0x0
        priv = 0x7f89ec07ed60
        op_errno = 22
        __FUNCTION__ = "br_stub_fsetxattr"

This results in a segmentation fault in line 1328 of bit-rot_stub.c :

if (!IA_ISREG(fd->inode->ia_type))
        goto wind;

The bitrot-stub wants to signate a file but the corresponding fd is a
Nullpointer.

The full backtrace is attached!!!

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