Date: Thu, 14 Dec 2006 14:05:10 -0500 From: Brian Dean <brian@bsdhome.com> To: freebsd-hackers@freebsd.org Subject: Kernel hang on 6.x Message-ID: <20061214190510.GA26590@neutrino.bsdhome.com>
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Hi,
We're experiencing a kernel hang on a 6.x quad processor Sun amd64
based system. We are able to reproduce it fairly reliably, but the
environment to do so is not easily replicatable so I cannot provide a
simple test case. However, I have been able to build a debug kernel
and when the system "hangs", I can break to the debugger prompt. But
once there, I'm not sure what to do to isolate where the system is
hung up. I have confirmed that the hang occurs in both SMP and
uniprocessor mode. Here are some system details:
uname -a:
FreeBSD bb02f54 6.2-BETA2 FreeBSD 6.2-BETA2 #4: Wed Dec 13 11:43:38 EST 2006 root@bb02f54:/usr/src/sys/amd64/compile/BBKERN amd64
FreeBSD 6.2-BETA2 #4: Wed Dec 13 11:43:38 EST 2006
root@bb02f54:/usr/src/sys/amd64/compile/BBKERN
WARNING: WITNESS option enabled, expect reduced performance.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Dual Core AMD Opteron(tm) Processor 275 (2193.76-MHz K8-class CPU)
Origin = "AuthenticAMD" Id = 0x20f12 Stepping = 2
Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
Features2=0x1<SSE3>
AMD Features=0xe2500800<SYSCALL,NX,MMX+,FFXSR,LM,3DNow+,3DNow>
AMD Features2=0x3<LAHF,CMP>
Cores per package: 2
real memory = 17179869184 (16384 MB)
avail memory = 16518569984 (15753 MB)
ACPI APIC Table: <SUN X4200 >
The hang appears to occur under heavy memory usage and usually seems
to happen when the process size approaches the size of swap.
If anyone can offer a suggestion as to what information from the db>
prompt might help home in on this problem, please let me know. A
simple backtrace wasn't terribly englightening, at least to me:
db> bt
Tracing pid 18 tid 100011 td 0xffffff03e1563980
kdb_enter() at kdb_enter+0x2f
scgetc() at scgetc+0x43e
sckbdevent() at sckbdevent+0x83
kbdmux_intr() at kbdmux_intr+0x4d
kbdmux_kbd_intr() at kbdmux_kbd_intr+0x20
taskqueue_run() at taskqueue_run+0x135
ithread_loop() at ithread_loop+0x132
fork_exit() at fork_exit+0x87
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffffffbf50ad00, rbp = 0 ---
db>
db> show reg
cs 0x8
ss 0x10
rax 0x26
rcx 0x10457a
rdx 0x1
rbx 0
rsp 0xffffffffbf50aac0
rbp 0xffffffffbf50aad0
rsi 0xffffffff80c11000
rdi 0
r8 0xffe00
r9 0xa
r10 0xffffffffbf50a9e0
r11 0xa
r12 0xffffffff80957c20 main_softc
r13 0xffffffff809579c0 main_console
r14 0x2
r15 0
rip 0xffffffff803fd57f kdb_enter+0x2f
rflags 0x286
dr0 0
dr1 0
dr2 0
dr3 0
dr4 0xffff0ff0
dr5 0x400
dr6 0xffff0ff0
dr7 0x400
kdb_enter+0x2f: nop
db>
Thanks!
-Brian
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