lseek system call failure due to SIGSEGV

[Pankaj Agrawal]

The following lseek call in failing due to the receipt of SIGSEGV signal. Can someone comment on the possible cause.

lseek(10, 0, 0) = 0

The truss output of the process is as shown:

Incurred fault #6, FLTBOUNDS %pc = 0xBFFC9550
siginfo: SIGSEGV SEGV_ACCERR addr=0x00000000
Received signal #11, SIGSEGV [caught]
siginfo: SIGSEGV SEGV_ACCERR addr=0x00000000

The process is getting killed as a result

[A. Clay Stephenson]

I rather doubt that it is lseek() that is failing because all of the parameters are reasonable. This looks more like the actual failure occurred in a read() or write() and a NULL pointer was passed. It's possible for lseek() to give very strange results in some implementations if for example you attempt to lseek() on a file that does not support random access, e.g. a serial device.

[Pankaj Agrawal]

Clay, thanks for the info...
But still i am unable to figure out the actual cause. I am attaching a detailed truss output...

sigsuspend(0x080475CC) (sleeping...)
Received signal #14, SIGALRM, in sigsuspend) [caught]
sigsuspend(0x080475CC) Err#4 EINTR
setcontext(0x080473A4)
alarm(0) = 0
sigprocmask(SIG_UNBLOCK, 0x080475DC, 0x00000000) = 0
sigaction(SIGALRM, 0x08047574, 0x00000000) = 0
getpid() = 15237 [ 7000 ]
time() = 1121145011
xstat(2, "xui5001A.trace", 0x080475A0) = 0
fxstat(2, 7, 0x080474C4) = 0
write(7, " T R A C E 1 : C N C".., 113) = 113
fcntl(9, F_SETLK, 0x080476AC) = 0
getpid() = 15237 [ 7000 ]
time() = 1121145011
xstat(2, "xui5001A.trace", 0x08047478) = 0
fxstat(2, 7, 0x0804739C) = 0
write(7, " T R A C E 1 : C N C".., 105) = 105
ioctl(9, TCGETA, 0x080473FC) Err#25 ENOTTY
fxstat(2, 9, 0x08047430) = 0
read(9, " U s e r I D = 0 0 4 5 6".., 8192) = 16
getpid() = 15237 [ 7000 ]
time() = 1121145011
xstat(2, "xui5001A.trace", 0x08047478) = 0
fxstat(2, 7, 0x0804739C) = 0
write(7, " T R A C E 1 : C N C".., 105) = 105
lseek(9, 0, 0) = 0
Incurred fault #6, FLTBOUNDS %pc = 0xBFFC9550
siginfo: SIGSEGV SEGV_ACCERR addr=0x00000000
Received signal #11, SIGSEGV [caught]
siginfo: SIGSEGV SEGV_ACCERR addr=0x00000000
sigaction(SIGSEGV, 0x08047304, 0x00000000) = 0
sigrelse(SIGSEGV) = SIG_DFL
umask(0) = 0
open("/opt/topenddir/logs/tp_err", O_RDWR|O_APPEND|O_CREAT, 0666) = 10
umask(0) = 0
time() = 1121145011
fcntl(4, F_SETLKW, 0x08046424) = 0
fcntl(4, F_SETLKW, 0x08046424) = 0
fcntl(4, F_SETLK, 0x0804655C) = 0
fcntl(4, F_SETLK, 0x0804655C) = 0
time() = 1121145011
getpid() = 15237 [ 7000 ]
fcntl(10, F_SETLKW, 0x0804655C) = 0
fcntl(10, F_SETLKW, 0x0804655C) = 0
xstat(2, "/opt/topenddir/logs/tp_err_init", 0x08046954) = 0
xstat(2, "/opt/topenddir/logs/tp_err", 0x080468CC) = 0
ioctl(10, TCGETA, 0x080464B0) Err#25 ENOTTY
fxstat(2, 10, 0x080464E4) = 0
fcntl(10, F_SETLK, 0x08046554) = 0
fcntl(10, F_SETLK, 0x08046554) = 0
msgsnd(3, 0x08046D70, 146, IPC_NOWAIT) = 0
write(10, " 0 7 / 1 2 / 0 5 | 0 5 :".., 141) = 141
close(10) = 0
fcntl(4, F_SETLKW, 0x08046424) = 0
fcntl(4, F_SETLKW, 0x08046424) = 0
write(4, "\n # #\n 4 | 0 7 / 1 2 /".., 145) = 145
xstat(2, "/opt/topenddir/rdba/ac/xui5001/tp_logfile", 0x08046520) = 0
fxstat(2, 4, 0x08046498) = 0
fcntl(4, F_SETLK, 0x0804655C) = 0
fcntl(4, F_SETLK, 0x0804655C) = 0
fcntl(4, F_SETLKW, 0x08046E0C) = 0
fcntl(4, F_SETLKW, 0x08046E0C) = 0
time() = 1121145011
getpid() = 15237 [ 7000 ]
write(4, "\n # #\n 1 | 0 7 / 1 2 /".., 129) = 129
xstat(2, "/opt/topenddir/rdba/ac/xui5001/tp_logfile", 0x08046F08) = 0
fxstat(2, 4, 0x08046E80) = 0
fcntl(4, F_SETLK, 0x08046F44) = 0
fcntl(4, F_SETLK, 0x08046F44) = 0
fcntl(4, F_SETLKW, 0x08046DDC) = 0
fcntl(4, F_SETLKW, 0x08046DDC) = 0
time() = 1121145011
getpid() = 15237 [ 7000 ]
write(4, "\n # #\n 1 | 0 7 / 1 2 /".., 133) = 133
xstat(2, "/opt/topenddir/rdba/ac/xui5001/tp_logfile", 0x08046ED8) = 0
fxstat(2, 4, 0x08046E50) = 0
fcntl(4, F_SETLK, 0x08046F14) = 0
fcntl(4, F_SETLK, 0x08046F14) = 0
fcntl(4, F_SETLKW, 0x08046DD8) = 0
fcntl(4, F_SETLKW, 0x08046DD8) = 0
time() = 1121145011
getpid() = 15237 [ 7000 ]
write(4, "\n # #\n 1 | 0 7 / 1 2 /".., 163) = 163
xstat(2, "/opt/topenddir/rdba/ac/xui5001/tp_logfile", 0x08046ED4) = 0
fxstat(2, 4, 0x08046E4C) = 0
fcntl(4, F_SETLK, 0x08046F10) = 0
fcntl(4, F_SETLK, 0x08046F10) = 0
fcntl(4, F_SETLKW, 0x08046DD4) = 0
fcntl(4, F_SETLKW, 0x08046DD4) = 0
time() = 1121145011
getpid() = 15237 [ 7000 ]
write(4, "\n # #\n 2 | 0 7 / 1 2 /".., 8153) = 8153
write(4, "\n 0 8 0 7 8 7 4 4 1 3".., 7823) = 7823
xstat(2, "/opt/topenddir/rdba/ac/xui5001/tp_logfile", 0x08046ED0) = 0
fxstat(2, 4, 0x08046E48) = 0
fcntl(4, F_SETLK, 0x08046F0C) = 0
fcntl(4, F_SETLK, 0x08046F0C) = 0
fcntl(4, F_SETLKW, 0x08046DD4) = 0
fcntl(4, F_SETLKW, 0x08046DD4) = 0
time() = 1121145011
getpid() = 15237 [ 7000 ]
write(4, "\n # #\n 2 | 0 7 / 1 2 /".., 8192) = 8192
write(4, "\n 0 8 0 8 6 a 3 8 0 6".., 7937) = 7937
xstat(2, "/opt/topenddir/rdba/ac/xui5001/tp_logfile", 0x08046ED0) = 0
fxstat(2, 4, 0x08046E48) = 0
fcntl(4, F_SETLK, 0x08046F0C) = 0
fcntl(4, F_SETLK, 0x08046F0C) = 0
sighold(SIGSEGV) = SIG_DFL
getpid() = 15237 [ 7000 ]
kill(15237, SIGSEGV) = 0
setcontext(0x08047434)
Received signal #11, SIGSEGV [default]
siginfo: SIGSEGV pid=15237 uid=201
*** process killed ***


Lemme know if u have some suggestion...