Date: Sat, 08 Mar 2003 11:46:34 +0100 From: Poul-Henning Kamp <phk@phk.freebsd.dk> To: current@freebsd.org Subject: NULL pointer problem in pid selection ? Message-ID: <54592.1047120394@critter.freebsd.dk>
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Just got this crash on -current, and I belive I have seen similar
before. addr2line(1) reports the faulting address to be
../../../kern/kern_fork.c:395
which is in the inner loop of pid collision avoidance.
Poul-Henning
Fatal trap 12: page fault while in kernel mode
cpuid = 0; lapic.id = 00000000
fault virtual address = 0x14
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc01c3eec
stack pointer = 0x10:0xe74e3c74
frame pointer = 0x10:0xe74e3cbc
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 = 99777 (sh)
trap number = 12
panic: page fault
cpuid = 0; lapic.id = 00000000
Stack backtrace:
backtrace(c032ff8e,0,c03394ce,e74e3b68,1) at 0xc01d86a7 = backtrace+0x17
panic(c03394ce,c0342131,cfe5496c,1,1) at 0xc01d87ba = panic+0x10a
trap_fatal(e74e3c34,14,c03422ba,2e3,cfe4fa50) at 0xc02fa672 = trap_fatal+0x322
trap_pfault(e74e3c34,0,14,c035a038,14) at 0xc02fa322 = trap_pfault+0x1c2
trap(18,10,10,cf19c3f8,cf76b9ec) at 0xc02f9e9d = trap+0x3cd
calltrap() at 0xc02e2cd8 = calltrap+0x5
--- trap 0xc, eip = 0xc01c3eec, esp = 0xe74e3c74, ebp = 0xe74e3cbc ---
fork1(cfe4fa50,14,0,e74e3cd4,cfe54858) at 0xc01c3eec = fork1+0x3fc
fork(cfe4fa50,e74e3d10,c03422ba,404,0) at 0xc01c3852 = fork+0x52
syscall(2f,2f,2f,0,80ff000) at 0xc02fa98e = syscall+0x26e
Xint0x80_syscall() at 0xc02e2d2d = Xint0x80_syscall+0x1d
--- syscall (2), eip = 0x807ba9f, esp = 0xbfbff6bc, ebp = 0xbfbff6e8 ---
boot() called on cpu#0
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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