[stgt] segfault when stopping the target

[Tomasz Chmielewski]

FUJITA Tomonori schrieb:

>>>> # tgtadm --op delete --mode conn --tid 2 --sid 2 --cid 0
>>>> Segmentation fault
>>>>
>>>> If a segfault does not happen immediately, start all these commands 
>>>> again (or, generally, "tgtadm --op delete --mode conn --tid 2 --sid 1 
>>>> --cid 0" is enough).
>>>>
>>>> For me, on x86, segfault happens in 90% of cases. Sometimes, the 
>>>> connection is eventually deleted.
> 
> I tried the above commands three times on x86 but I can't reproduce
> this problem.

It is easier when there is some traffic to the target.


> Can you use gdb to find where tgtadm crashes?

Sure.
Here is strace output, but it doesn't say much, does it? I'll try to get more data with gdb.

execve("/usr/sbin/tgtadm", ["tgtadm", "--op", "delete", "--mode", "conn", "--tid", "1", "--sid", "1", "--cid", "0"], [/* 20 vars */]) = 0
uname({sys="Linux", node="megathecus", ...}) = 0
brk(0)                                  = 0x804d000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x6feee000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=16095, ...}) = 0
mmap2(NULL, 16095, PROT_READ, MAP_PRIVATE, 3, 0) = 0x6feea000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/tls/libc.so.6", O_RDONLY)    = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240O\1"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=1245488, ...}) = 0
mmap2(NULL, 1251484, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x6fdb8000
mmap2(0x6fee0000, 28672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x128) = 0x6fee0000
mmap2(0x6fee7000, 10396, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x6fee7000
close(3)                                = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x6fdb7000
mprotect(0x6fee0000, 20480, PROT_READ)  = 0
set_thread_area({entry_number:-1 -> 6, base_addr:0x6fdb78e0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0,useable:1}) = 0
munmap(0x6feea000, 16095)               = 0
brk(0)                                  = 0x804d000
brk(0x8070000)                          = 0x8070000
socket(PF_FILE, SOCK_STREAM, 0)         = 3
connect(3, {sa_family=AF_FILE, path=@TGT_IPC_ABSTRACT_NAMESPACE}, 110) = 0
write(3, "\4\0\0\0\1\0\0\0iscsi\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 116) = 116
read(3, "", 8)                          = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
Process 5131 detached


> BTW, what version of tgt do you use? This happens with old versions?

It happens with the newest git.



-- 
Tomasz Chmielewski
http://wpkg.org
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