freebsd stable - May 2005 - bpf/fxp RELENG_5 LOR

FreeBSD 5.4-STABLE #0: Mon May  2 02:26:10 CEST 2005
    root@82-168-79-254-bbxl.xdsl.tiscali.nl:/usr/obj/usr/src/sys/RENE

#tcpdump

fxp0: promiscuous mode enabled

lock order reversal
 1st 0xc066de80 bpf global lock (bpf global lock) @ /usr/src/sys/net/bpf.c:385
 2nd 0xc14c9264 fxp0 (network driver) @
/usr/src/sys/modules/fxp/../../dev/fxp/if_fxp.c:2394
KDB: stack backtrace:
kdb_backtrace(c05fd3e5,c14c9264,c14a47e0,c06fe820,c06fe7bd) at 0xc04b0aee =
kdb_backtrace+0x2e
witness_checkorder(c14c9264,9,c06fe7bd,95a,c0648ec0) at 0xc04bbb86 =
witness_checkorder+0x6a6
_mtx_lock_flags(c14c9264,0,c06fe7bd,95a,c14c9264) at 0xc048a9ca =
_mtx_lock_flags+0x8a
fxp_ioctl(c14c9000,80206910,cae60aa8,c06212fc,c156d9dc) at 0xc06fe14e =
fxp_ioctl+0x5e
ifpromisc(c14c9000,0,c06024ea,129,c1cdd200) at 0xc050a358 = ifpromisc+0xe8
bpf_detachd(c1cdd200,0,c06024ea,181,c1bfa528) at 0xc0504d85 = bpf_detachd+0xe5
bpfclose(c1b07700,1,2000,c19d1000,c0628e20) at 0xc0504ff4 = bpfclose+0xb4
spec_close(cae60b70,cae60b98,c0500ba7,cae60b70,1) at 0xc04542d8 =
spec_close+0x378
spec_vnoperate(cae60b70,1,c060242a,140,c063ad40) at 0xc0452e58 =
spec_vnoperate+0x18
vn_close(c1bfa528,1,c198cd00,c19d1000,c066d240) at 0xc0500ba7 = vn_close+0x67
vn_closefile(c1d82a18,c19d1000,c05f685f,849,c1d82a18) at 0xc0501d34 =
vn_closefile+0xc4
fdrop_locked(c1d82a18,c19d1000,c05f685f,834) at 0xc0471cde = fdrop_locked+0xbe
fdrop(c1d82a18,c19d1000,c05f685f,77c,cae60c7c,c04bc210,c066d240,cae60c78,c04bbc67,0,c1cdd32c,246,c06212fc,c1cdd32c,3ea,c05f685f,cae60ca0,c048aada,c1cdd32c,1,c05f9016,12b)
at 0xc0471c0c = fdrop+0x3c
closef(c1d82a18,c19d1000,c05f685f,3ea,c19d1000) at 0xc0470032 = closef+0x3d2
close(c19d1000,cae60d04,4,439,1) at 0xc046cfdc = close+0x22c
syscall(2f,2f,2f,280f1a2d,817f000) at 0xc05d9fe0 = syscall+0x2c0
Xint0x80_syscall() at 0xc05c885f = Xint0x80_syscall+0x1f
--- syscall (6, FreeBSD ELF32, close), eip = 0x282506df, esp = 0xbfbfeabc, ebp =
0xbfbfead8 ---
KDB: enter: witness_checkorder

fxp0: promiscuous mode disabled
-- 
"It won't fit on the line."
		-- me, 2001
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On Mon, May 02, 2005 at 02:51:05PM +0200, Rene Ladan
wrote:
> 
> FreeBSD 5.4-STABLE #0: Mon May  2 02:26:10 CEST 2005
>     root@82-168-79-254-bbxl.xdsl.tiscali.nl:/usr/obj/usr/src/sys/RENE
> 
> #tcpdump
> 
> fxp0: promiscuous mode enabled
> 
> lock order reversal
>  1st 0xc066de80 bpf global lock (bpf global lock) @
/usr/src/sys/net/bpf.c:385
>  2nd 0xc14c9264 fxp0 (network driver) @
/usr/src/sys/modules/fxp/../../dev/fxp/if_fxp.c:2394
> 
> fxp0: promiscuous mode disabled
Of course, to obfuscate debugging, this only happens sporadically, e.g.
when using tcpdump the first time. :(

This and related fxp LORs all point to some file and to
src/sys/dev/fxp/if_fxp.c, at places where a FXP_LOCK(sc), with sc of
type fxp_softc * is done.

from src/sys/dev/fxp/fxpvar.h:

#define	FXP_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)

Regards,
Rene
-- 
"It won't fit on the line."
		-- me, 2001
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