Date: Fri, 23 Apr 2010 11:39:26 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: freebsd-ipfw@freebsd.org Subject: cdpd/ladvd panic after r205511 MFC Message-ID: <20100423163926.GD14572@dan.emsphone.com>
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I recently upgraded my 8-stable i386 kernel, and ladvd caused a panic during bootup. ladvd is a deamon that sends out switch discovery frames via /dev/bpf . Switching to cdpd (another program like ladvd) results in the same panic. I traced it down to the ipfw MFC on 2010-03-23 (rev r205511). Unfortunately, all my crash dumps give garbage stack traces so the only info I have is the trap log and a DDB backtrace. I can generate more crashdumps if they are needed for debugging. It's reproducable on a GENERIC kernel by loading ipfw, ensuring that all traffic is allowed, and starting up either ladvd or cdpd from ports. Fatal trap 12: page fault while in kernel mode cpuid = 2; apic id = 02 fault virtual address = 0x0 fault code = supervisor read, page not present instruction pointer = 0x20:0x808a17f4 stack pointer = 0x28:0xe1526b58 frame pointer = 0x28:0xe1526bb8 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 = 2967 (ladvd) db:0:kdb.enter.default> show pcpu cpuid = 3 dynamic pcpu = 0x5f60600 curthread = 0x8c71b4a0: pid 2967 "ladvd" curpcb = 0xe1526d90 fpcurthread = none idlethread = 0x86d5e940: pid 11 "idle: cpu3" APIC ID = 3 currentldt = 0x50 spin locks held: db:0:kdb.enter.default> bt Tracing pid 2967 tid 100264 td 0x8c71b4a0 bcmp(86ea5d00,e1526c58,0,0,0,...) at bcmp+0x14 devfs_write_f(8eb588c0,e1526c58,86d5a100,0,8c71b4a0,...) at devfs_write_f+0xc1 dofilewrite(e1526c58,ffffffff,ffffffff,0,8eb588c0,...) at dofilewrite+0x95 kern_writev(8c71b4a0,a,e1526c58,e1526c78,1,...) at kern_writev+0x58 write(8c71b4a0,e1526cf8,80954c4b,8093722a,8eb0a550,...) at write+0x4f syscall(e1526d38) at syscall+0x260 Xint0x80_syscall() at Xint0x80_syscall+0x20 --- syscall (4, FreeBSD ELF32, write), eip = 0x281a7543, esp = 0x7fbfe42c, ebp = 0x7fbfe478 --- -- Dan Nelson dnelson@allantgroup.com
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