Maslan <[email protected]> writes: > Fatal trap 12: page fault while in kernel mode > cpuid = 1; apic id = 01 > fault virtual address = 0x10 > fault code = supervisor read, page not present > instruction pointer = 0x20:0xc085935b > [...] > #7 0xc085935b in namei (ndp=0xe6cd3bc8) at /usr/src/sys/kern/vfs_lookup.c:191 > #8 0xc08706d7 in vn_open_cred (ndp=0xe6cd3bc8, flagp=0xe6cd3cc4, cmode=1, > cred=0xc408fc00, fp=0xc4b5b344) at /usr/src/sys/kern/vfs_vnops.c:188 > #9 0xc08709a3 in vn_open (ndp=0xe6cd3bc8, flagp=0xe6cd3cc4, cmode=1, > fp=0xc4b5b344) at /usr/src/sys/kern/vfs_vnops.c:94 > #10 0xc086e0d3 in kern_open (td=0xc499dd20, path=0xc4c7a978 "/root/test.txt", > pathseg=UIO_SYSSPACE, flags=1, mode=1) > at /usr/src/sys/kern/vfs_syscalls.c:1042 > #11 0xc4c7a805 in f_open () from ./test.ko > #12 0xc4c7a8a1 in thread_main () from ./test.ko > #13 0xc07bd079 in fork_exit (callout=0xc4c7a880 <thread_main>, arg=0x0, > frame=0xe6cd3d38) at /usr/src/sys/kern/kern_fork.c:810 > #14 0xc0ac92b0 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:264
Depending on the exact FreeBSD version you're working on, line 191 in sys/kern/vfs_lookup.c is either 188 /* 189 * Get starting point for the translation. 190 */ * 191 FILEDESC_SLOCK(fdp); 192 ndp->ni_rootdir = fdp->fd_rdir; 193 ndp->ni_topdir = fdp->fd_jdir; or 187 /* 188 * Get starting point for the translation. 189 */ 190 FILEDESC_SLOCK(fdp); * 191 ndp->ni_rootdir = fdp->fd_rdir; 192 ndp->ni_topdir = fdp->fd_jdir; Either way, the problem is not ndp (which we know is valid), but fdp, which is dereferenced either by FILEDESC_SLOCK(), which evaluates to sx_slock(&fdp->fd_sx), or in the assignment. You're calling namei() (indirectly) from a thread assigned to proc0, and I'm pretty sure proc0 has a valid filedesc table (see proc0_init() in sys/kern/init_main.c), but all the same, I suspect that creating a separate process as I suggested earlier will fix the panic. DES -- Dag-Erling Smørgrav - [email protected] _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
