Date: Thu, 24 May 2007 12:40:09 GMT From: Ruslan Ermilov <ru@FreeBSD.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/112937: Panic in em(4) when issuing a SIOCGIFADDR ioctl Message-ID: <200705241240.l4OCe9Pc066237@freefall.freebsd.org>
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The following reply was made to PR kern/112937; it has been noted by GNATS. From: Ruslan Ermilov <ru@FreeBSD.org> To: Fredrik Lindberg <fli@shapeshifter.se> Cc: yongari@FreeBSD.org, jfv@FreeBSD.org, bug-followup@FreeBSD.org Subject: Re: kern/112937: Panic in em(4) when issuing a SIOCGIFADDR ioctl Date: Thu, 24 May 2007 16:04:30 +0400 On Thu, May 24, 2007 at 01:00:10PM +0200, Fredrik Lindberg wrote: > The em-driver will panic if one issues a SIOCGIFADDR ioctl to a em-device > with only an inet6 address configured. > > em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 > options=18b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWCSUM,TSO4> > ether 00:11:25:16:db:58 > inet6 fe80::211:25ff:fe16:db58%em0 prefixlen 64 scopeid 0x1 > media: Ethernet autoselect > status: no carrier > > Fatal trap 12: page fault while in kernel mode > cpuid = 0; apic id = 00 > fault virtual address = 0x306d66 > fault code = supervisor read, page not present > instruction pointer = 0x20:0xc087113b > stack pointer = 0x28:0xe63b4b4c > frame pointer = 0x28:0xe63b4b7c > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, def32 1, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 1576 (foo) > > Backtrace > #9 0xc06ad62b in calltrap () at /usr/src/sys/i386/i386/exception.s:139 > #10 0xc087113b in em_ioctl (ifp=0xc3c01c00, command=3223349537, > data=0xc48fcd80 "em0") at /usr/src/sys/modules/em/../../dev/em/if_em.c:977 > #11 0xc05e44ff in in6_control (so=0xc46cd318, cmd=3284147200, > data=0xc48fcd80 "em0", ifp=0xc3c01c00, td=0xc4227000) > at /usr/src/sys/netinet6/in6.c:785 > #12 0xc059f258 in ifioctl (so=0xc46cd318, cmd=3223349537, data=0xc48fcd80 "em0", > td=0xc4227000) at /usr/src/sys/net/if.c:1874 > #13 0xc055ae97 in soo_ioctl (fp=0x306d65, cmd=3223349537, data=0xc48fcd80, > active_cred=0xc4265700, td=0xc4227000) at /usr/src/sys/kern/sys_socket.c:202 > #14 0xc0555dba in kern_ioctl (td=0xc4227000, fd=3, com=3223349537, > data=0xc48fcd80 "em0") at file.h:266 > #15 0xc0555bc5 in ioctl (td=0xc4227000, uap=0xe63b4d00) > at /usr/src/sys/kern/sys_generic.c:542 > > The offending line is > (kgdb) f 10 > #10 0xc087113b in em_ioctl (ifp=0xc3c01c00, command=3223349537, > data=0xc48fcd80 "em0") at /usr/src/sys/modules/em/../../dev/em/if_em.c:977 > 977 if (ifa->ifa_addr->sa_family == AF_INET) { > > This is because SIOCGIFADDR expects a pointer to "struct ifreq" as an argument and not "struct ifaddr" -- it got broken in rev. 1.119 by yongari@ which shouldn't have touched SIOCGIFADDR at all. The fix is simple -- just remove the line that tests for SIOCGIFADDR, and it will get correctly passed down to ether_ioctl() later, like it was before rev. 1.119: %%% Index: if_em.c =================================================================== RCS file: /home/ncvs/src/sys/dev/em/if_em.c,v retrieving revision 1.178 diff -u -p -r1.178 if_em.c --- if_em.c 23 May 2007 20:41:20 -0000 1.178 +++ if_em.c 24 May 2007 11:57:41 -0000 @@ -973,7 +973,6 @@ em_ioctl(struct ifnet *ifp, u_long comma switch (command) { case SIOCSIFADDR: - case SIOCGIFADDR: if (ifa->ifa_addr->sa_family == AF_INET) { /* * XXX %%% Thanks for the report! Cheers, -- Ruslan Ermilov ru@FreeBSD.org FreeBSD committer
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