Date: Thu, 22 Dec 2011 15:22:42 GMT From: Volodymyr Kostyrko <c.kworr@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/163540: SCHED_4BSD seems unstable on RELENG_9 Message-ID: <201112221522.pBMFMgL5048667@red.freebsd.org> Resent-Message-ID: <201112221530.pBMFUCAx071764@freefall.freebsd.org>
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>Number: 163540
>Category: kern
>Synopsis: SCHED_4BSD seems unstable on RELENG_9
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Dec 22 15:30:11 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Volodymyr Kostyrko
>Release: RELENG_9
>Organization:
>Environment:
FreeBSD green.tandem.local 9.0-PRERELEASE FreeBSD 9.0-PRERELEASE #0: Thu Dec 22 15:46:04 EET 2011 arcade@green.tandem.local:/usr/obj/usr/src/sys/MINIMAL_4BSD amd64
>Description:
Recently tried to switch to SCHED_4BSD for testing purposes. After that system starts to dump core from time to time.
>How-To-Repeat:
Compile a kernel with SCHED_4BSD, then sysctl -a for me throws:
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address = 0xf
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff8038cd3f
stack pointer = 0x28:0xffffff80d7e48700
frame pointer = 0x28:0xffffff80d7e48770
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 2030 (sysctl)
trap number = 12
panic: page fault
cpuid = 1
KDB: stack backtrace:
#0 0xffffffff803b2198 at kdb_backtrace+0x58
#1 0xffffffff80381f40 at panic+0x190
#2 0xffffffff8058ee55 at trap_fatal+0x395
#3 0xffffffff8058f029 at trap_pfault+0x1c9
#4 0xffffffff8058e876 at trap+0x3a6
#5 0xffffffff80579943 at calltrap+0x8
#6 0xffffffff8038cd11 at sysctl_sysctl_next_ls+0x71
#7 0xffffffff8038cd11 at sysctl_sysctl_next_ls+0x71
#8 0xffffffff8038cd11 at sysctl_sysctl_next_ls+0x71
#9 0xffffffff8038cc43 at sysctl_sysctl_next+0x83
#10 0xffffffff8038bf41 at sysctl_root+0x211
#11 0xffffffff8038c508 at userland_sysctl+0x1d8
#12 0xffffffff8038c2f4 at sys___sysctl+0x74
#13 0xffffffff8058f505 at amd64_syscall+0x2a5
#14 0xffffffff80579c2b at Xfast_syscall+0xfb
(kgdb) bt
#0 sched_switch (td=Variable "td" is not available.
) at /usr/src/sys/kern/sched_4bsd.c:1021
#1 0xffffffff80389c94 in mi_switch (flags=dwarf2_read_address: Corrupted DWARF expression.
) at /usr/src/sys/kern/kern_synch.c:448
#2 0xffffffff803bc8ca in sleepq_timedwait (wchan=dwarf2_read_address: Corrupted DWARF expression.
) at /usr/src/sys/kern/subr_sleepqueue.c:652
#3 0xffffffff80389846 in _sleep (ident=Variable "ident" is not available.
) at /usr/src/sys/kern/kern_synch.c:230
#4 0xffffffff8055ed29 in scheduler (dummy=dwarf2_read_address: Corrupted DWARF expression.
) at /usr/src/sys/vm/vm_glue.c:793
#5 0xffffffff803394c3 in mi_startup () at /usr/src/sys/kern/init_main.c:258
#6 0xffffffff8025c93c in btext ()
#7 0xffffffff808e0aa0 in sleepq_chains ()
#8 0xfffffe0006b14440 in ?? ()
#9 0x0000000000000000 in ?? ()
#10 0x0000000000000000 in ?? ()
#11 0xffffffff81ef0bb0 in ?? ()
#12 0xffffffff81ef0b68 in ?? ()
#13 0xffffffff80929890 in bootverbose ()
#14 0xffffffff803a5345 in sched_switch (td=Variable "td" is not available.
) at /usr/src/sys/kern/sched_4bsd.c:1001
Current language: auto; currently minimal
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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