mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Neil Horman](/assets/img/avatar_default.png)
Recently had this bug halt reported to me: kernel BUG at net/rds/send.c:329! Oops: Exception in kernel mode, sig: 5 [#1] SMP NR_CPUS=1024 NUMA pSeries Modules linked in: rds sunrpc ipv6 dm_mirror dm_region_hash dm_log ibmveth sg ext4 jbd2 mbcache sd_mod crc_t10dif ibmvscsic scsi_transport_srp scsi_tgt dm_mod [last unloaded: scsi_wait_scan] NIP: d000000003ca68f4 LR: d000000003ca67fc CTR: d000000003ca8770 REGS: c000000175cab980 TRAP: 0700 Not tainted (2.6.32-118.el6.ppc64) MSR: 8000000000029032 <EE,ME,CE,IR,DR> CR: 44000022 XER: 00000000 TASK = c00000017586ec90[1896] 'krdsd' THREAD: c000000175ca8000 CPU: 0 GPR00: 0000000000000150 c000000175cabc00 d000000003cb7340 0000000000002030 GPR04: ffffffffffffffff 0000000000000030 0000000000000000 0000000000000030 GPR08: 0000000000000001 0000000000000001 c0000001756b1e30 0000000000010000 GPR12: d000000003caac90 c000000000fa2500 c0000001742b2858 c0000001742b2a00 GPR16: c0000001742b2a08 c0000001742b2820 0000000000000001 0000000000000001 GPR20: 0000000000000040 c0000001742b2814 c000000175cabc70 0800000000000000 GPR24: 0000000000000004 0200000000000000 0000000000000000 c0000001742b2860 GPR28: 0000000000000000 c0000001756b1c80 d000000003cb68e8 c0000001742b27b8 NIP [d000000003ca68f4] .rds_send_xmit+0x4c4/0x8a0 [rds] LR [d000000003ca67fc] .rds_send_xmit+0x3cc/0x8a0 [rds] Call Trace: [c000000175cabc00] [d000000003ca67fc] .rds_send_xmit+0x3cc/0x8a0 [rds] (unreliable) [c000000175cabd30] [d000000003ca7e64] .rds_send_worker+0x54/0x100 [rds] [c000000175cabdb0] [c0000000000b475c] .worker_thread+0x1dc/0x3c0 [c000000175cabed0] [c0000000000baa9c] .kthread+0xbc/0xd0 [c000000175cabf90] [c000000000032114] .kernel_thread+0x54/0x70 Instruction dump: 4bfffd50 60000000 60000000 39080001 935f004c f91f0040 41820024 813d017c 7d094a78 7d290074 7929d182 394a0020 <0b090000> 40e2ff68 4bffffa4 39200000 Kernel panic - not syncing: Fatal exception Call Trace: [c000000175cab560] [c000000000012e04] .show_stack+0x74/0x1c0 (unreliable) [c000000175cab610] [c0000000005a365c] .panic+0x80/0x1b4 [c000000175cab6a0] [c00000000002fbcc] .die+0x21c/0x2a0 [c000000175cab750] [c000000000030000] ._exception+0x110/0x220 [c000000175cab910] [c000000000004b9c] program_check_common+0x11c/0x180 Signed-off-by: David S. Miller <davem@davemloft.net>
194 lines
5.8 KiB
C
194 lines
5.8 KiB
C
/*
|
|
* Copyright (c) 2006 Oracle. All rights reserved.
|
|
*
|
|
* This software is available to you under a choice of one of two
|
|
* licenses. You may choose to be licensed under the terms of the GNU
|
|
* General Public License (GPL) Version 2, available from the file
|
|
* COPYING in the main directory of this source tree, or the
|
|
* OpenIB.org BSD license below:
|
|
*
|
|
* Redistribution and use in source and binary forms, with or
|
|
* without modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/in.h>
|
|
|
|
#include "rds.h"
|
|
#include "loop.h"
|
|
|
|
static DEFINE_SPINLOCK(loop_conns_lock);
|
|
static LIST_HEAD(loop_conns);
|
|
|
|
/*
|
|
* This 'loopback' transport is a special case for flows that originate
|
|
* and terminate on the same machine.
|
|
*
|
|
* Connection build-up notices if the destination address is thought of
|
|
* as a local address by a transport. At that time it decides to use the
|
|
* loopback transport instead of the bound transport of the sending socket.
|
|
*
|
|
* The loopback transport's sending path just hands the sent rds_message
|
|
* straight to the receiving path via an embedded rds_incoming.
|
|
*/
|
|
|
|
/*
|
|
* Usually a message transits both the sender and receiver's conns as it
|
|
* flows to the receiver. In the loopback case, though, the receive path
|
|
* is handed the sending conn so the sense of the addresses is reversed.
|
|
*/
|
|
static int rds_loop_xmit(struct rds_connection *conn, struct rds_message *rm,
|
|
unsigned int hdr_off, unsigned int sg,
|
|
unsigned int off)
|
|
{
|
|
struct scatterlist *sgp = &rm->data.op_sg[sg];
|
|
int ret = sizeof(struct rds_header) +
|
|
be32_to_cpu(rm->m_inc.i_hdr.h_len);
|
|
|
|
/* Do not send cong updates to loopback */
|
|
if (rm->m_inc.i_hdr.h_flags & RDS_FLAG_CONG_BITMAP) {
|
|
rds_cong_map_updated(conn->c_fcong, ~(u64) 0);
|
|
ret = min_t(int, ret, sgp->length - conn->c_xmit_data_off);
|
|
goto out;
|
|
}
|
|
|
|
BUG_ON(hdr_off || sg || off);
|
|
|
|
rds_inc_init(&rm->m_inc, conn, conn->c_laddr);
|
|
/* For the embedded inc. Matching put is in loop_inc_free() */
|
|
rds_message_addref(rm);
|
|
|
|
rds_recv_incoming(conn, conn->c_laddr, conn->c_faddr, &rm->m_inc,
|
|
GFP_KERNEL, KM_USER0);
|
|
|
|
rds_send_drop_acked(conn, be64_to_cpu(rm->m_inc.i_hdr.h_sequence),
|
|
NULL);
|
|
|
|
rds_inc_put(&rm->m_inc);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* See rds_loop_xmit(). Since our inc is embedded in the rm, we
|
|
* make sure the rm lives at least until the inc is done.
|
|
*/
|
|
static void rds_loop_inc_free(struct rds_incoming *inc)
|
|
{
|
|
struct rds_message *rm = container_of(inc, struct rds_message, m_inc);
|
|
rds_message_put(rm);
|
|
}
|
|
|
|
/* we need to at least give the thread something to succeed */
|
|
static int rds_loop_recv(struct rds_connection *conn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
struct rds_loop_connection {
|
|
struct list_head loop_node;
|
|
struct rds_connection *conn;
|
|
};
|
|
|
|
/*
|
|
* Even the loopback transport needs to keep track of its connections,
|
|
* so it can call rds_conn_destroy() on them on exit. N.B. there are
|
|
* 1+ loopback addresses (127.*.*.*) so it's not a bug to have
|
|
* multiple loopback conns allocated, although rather useless.
|
|
*/
|
|
static int rds_loop_conn_alloc(struct rds_connection *conn, gfp_t gfp)
|
|
{
|
|
struct rds_loop_connection *lc;
|
|
unsigned long flags;
|
|
|
|
lc = kzalloc(sizeof(struct rds_loop_connection), GFP_KERNEL);
|
|
if (!lc)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&lc->loop_node);
|
|
lc->conn = conn;
|
|
conn->c_transport_data = lc;
|
|
|
|
spin_lock_irqsave(&loop_conns_lock, flags);
|
|
list_add_tail(&lc->loop_node, &loop_conns);
|
|
spin_unlock_irqrestore(&loop_conns_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rds_loop_conn_free(void *arg)
|
|
{
|
|
struct rds_loop_connection *lc = arg;
|
|
unsigned long flags;
|
|
|
|
rdsdebug("lc %p\n", lc);
|
|
spin_lock_irqsave(&loop_conns_lock, flags);
|
|
list_del(&lc->loop_node);
|
|
spin_unlock_irqrestore(&loop_conns_lock, flags);
|
|
kfree(lc);
|
|
}
|
|
|
|
static int rds_loop_conn_connect(struct rds_connection *conn)
|
|
{
|
|
rds_connect_complete(conn);
|
|
return 0;
|
|
}
|
|
|
|
static void rds_loop_conn_shutdown(struct rds_connection *conn)
|
|
{
|
|
}
|
|
|
|
void rds_loop_exit(void)
|
|
{
|
|
struct rds_loop_connection *lc, *_lc;
|
|
LIST_HEAD(tmp_list);
|
|
|
|
/* avoid calling conn_destroy with irqs off */
|
|
spin_lock_irq(&loop_conns_lock);
|
|
list_splice(&loop_conns, &tmp_list);
|
|
INIT_LIST_HEAD(&loop_conns);
|
|
spin_unlock_irq(&loop_conns_lock);
|
|
|
|
list_for_each_entry_safe(lc, _lc, &tmp_list, loop_node) {
|
|
WARN_ON(lc->conn->c_passive);
|
|
rds_conn_destroy(lc->conn);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is missing .xmit_* because loop doesn't go through generic
|
|
* rds_send_xmit() and doesn't call rds_recv_incoming(). .listen_stop and
|
|
* .laddr_check are missing because transport.c doesn't iterate over
|
|
* rds_loop_transport.
|
|
*/
|
|
struct rds_transport rds_loop_transport = {
|
|
.xmit = rds_loop_xmit,
|
|
.recv = rds_loop_recv,
|
|
.conn_alloc = rds_loop_conn_alloc,
|
|
.conn_free = rds_loop_conn_free,
|
|
.conn_connect = rds_loop_conn_connect,
|
|
.conn_shutdown = rds_loop_conn_shutdown,
|
|
.inc_copy_to_user = rds_message_inc_copy_to_user,
|
|
.inc_free = rds_loop_inc_free,
|
|
.t_name = "loopback",
|
|
};
|