Date: Wed, 22 Mar 2006 21:55:08 -0800 From: "David Christensen" <dave@randomparity.com> To: <freebsd-current@freebsd.org> Subject: Witness finds "malloc(M_WAITOK) with non-sleepable lock held" in FreeBSD 7.0-CURRENT (amd64) Message-ID: <22C21BFBEB52B340A1F422CB0D88F5872E0A@snoopy.randomparity.com>
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I'm developing an Ethernet driver with FreeBSD 7.0-CURRENT (amd64) and
I'm=20
receiving many of the following witness errors:
malloc(M_WAITOK) of "128", forcing M_NOWAIT with the following
non-sleepable locks held:
exclusive sleep mutex bce0 (network driver) r =3D 0 (0xffffffff8111e068)
locked @ if_bce.c:4607
KDB: stack backtrace:
kdb_backtrace() at kdb_backtrace+0x37
witness_warn() at witness_warn+0x2c1
uma_zalloc_arg() at uma_zalloc_arg+0x69
malloc() at malloc+0xf5
sysctl_add_oid() at sysctl_add_oid+0xa9
alloc_bounce_zone() at alloc_bounce_zone+0x16b
bus_dma_tag_create() at bus_dma_tag_create+0x1ea
bce_init_rx_chain() at bce_init_rx_chain+0x8e
bce_init_locked() at bce_init_locked+0x1e2
bce_init() at bce_init+0x39
ether_ioctl() at ether_ioctl+0x87
bce_ioctl() at bce_ioctl+0x48e
in6_ifinit() at in6_ifinit+0xbd
in6_update_ifa() at in6_update_ifa+0x563
in6_ifattach_linklocal() at in6_ifattach_linklocal+0x126
in6_ifattach() at in6_ifattach+0xdf
in6_if_up() at in6_if_up+0x59
if_route() at if_route+0x8a
if_up() at if_up+0x13
ifhwioctl() at ifhwioctl+0x2f4
ifioctl() at ifioctl+0x10b
soo_ioctl() at soo_ioctl+0x38c
ioctl() at ioctl+0x436
syscall() at syscall+0x350
Xfast_syscall() at Xfast_syscall+0xa8
--- syscall (54, FreeBSD ELF64, ioctl), rip =3D 0x8008219ac, rsp =3D
0x7fffffffe6b8, rbp =3D 0x1 ---
The bus_dma_tag_create looks like this:
bus_dma_tag_create(
sc->parent_tag, /* parent */
4096, /* alignment */
0, /* boundary */
BUS_SPACE_MAXADDR, /* lowaddr */
BUS_SPACE_MAX_ADDR, /* lowaddr */
NULL, /* filter */
NULL, /* filterarg */
4096, /* maxsize */
1, /* nsegments */
4096, /* maxsegsize */
BUS_DMA_ALLOCNOW, /* flags */
NULL, /* lockfunc */
NULL, /* lockarg */
&sc->rx_bd_chain_tag));
Am I doing something wrong? The function bce_init_rx_chain is called
from with
a lock but isn't that normal?
David Christensen
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