kern/136426: spawning several dhclients in parallel panics the
kernel
Nikos Vassiliadis
nvass9573 at gmx.com
Tue Jul 7 14:00:10 UTC 2009
>Number: 136426
>Category: kern
>Synopsis: spawning several dhclients in parallel panics the kernel
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Jul 07 14:00:09 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator: Nikos Vassiliadis
>Release: 8.0-CURRENT
>Organization:
>Environment:
FreeBSD speed.homeunix.net 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Mon Jul 6 23:30:56 EEST 2009 root at speed.homeunix.net:/usr/obj/mnt/tst/src/sys/GENERIC i386
>Description:
Spawning many, like 20, dhclients in parallel results to kernel panic.
(kgdb) bt
#0 doadump () at pcpu.h:246
#1 0xc0874a7e in boot (howto=260) at /mnt/tst/src/sys/kern/kern_shutdown.c:419
#2 0xc0874d52 in panic (fmt=Variable "fmt" is not available.
) at /mnt/tst/src/sys/kern/kern_shutdown.c:575
#3 0xc04c4477 in db_panic (addr=Could not find the frame base for "db_panic".
) at /mnt/tst/src/sys/ddb/db_command.c:478
#4 0xc04c4aa1 in db_command (last_cmdp=0xc0d790bc, cmd_table=0x0, dopager=1) at /mnt/tst/src/sys/ddb/db_command.c:445
#5 0xc04c4bfa in db_command_loop () at /mnt/tst/src/sys/ddb/db_command.c:498
#6 0xc04c6a5d in db_trap (type=3, code=0) at /mnt/tst/src/sys/ddb/db_main.c:229
#7 0xc08a2ab6 in kdb_trap (type=3, code=0, tf=0xcd492a48) at /mnt/tst/src/sys/kern/subr_kdb.c:534
#8 0xc0b99efb in trap (frame=0xcd492a48) at /mnt/tst/src/sys/i386/i386/trap.c:685
#9 0xc0b7c41b in calltrap () at /mnt/tst/src/sys/i386/i386/exception.s:165
#10 0xc08a2c3a in kdb_enter (why=0xc0c58f38 "panic", msg=0xc0c58f38 "panic") at cpufunc.h:71
#11 0xc0874d36 in panic (fmt=0xc0bf52d3 "Bad link elm %p prev->next != elm") at /mnt/tst/src/sys/kern/kern_shutdown.c:558
#12 0xc096bcaf in in_control (so=0xc300bce0, cmd=2149607705, data=0xc2f92300 "rl0", ifp=0xc2a7e400, td=0xc3058900) at /mnt/tst/src/sys/netinet/in.c:594
#13 0xc0920f50 in ifioctl (so=0xc300bce0, cmd=2149607705, data=0xc2f92300 "rl0", td=0xc3058900) at /mnt/tst/src/sys/net/if.c:2302
#14 0xc08bed25 in soo_ioctl (fp=0xc2f84dc8, cmd=2149607705, data=0xc2f92300, active_cred=0xc296d100, td=0xc3058900) at /mnt/tst/src/sys/kern/sys_socket.c:212
#15 0xc08b93cd in kern_ioctl (td=0xc3058900, fd=3, com=2149607705, data=0xc2f92300 "rl0") at file.h:262
#16 0xc08b9554 in ioctl (td=0xc3058900, uap=0xcd492cf8) at /mnt/tst/src/sys/kern/sys_generic.c:678
#17 0xc0b99633 in syscall (frame=0xcd492d38) at /mnt/tst/src/sys/i386/i386/trap.c:1073
#18 0xc0b7c480 in Xint0x80_syscall () at /mnt/tst/src/sys/i386/i386/exception.s:261
#19 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)
>How-To-Repeat:
Spawn many dhclients in parallel:
dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 &
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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