On 02/01/2018 02:50 PM, Guanglei Li wrote:
Scenario:
1. Port down and do fail over
2. Ap do rds_bind syscall
PID: 47039 TASK: ffff89887e2fe640 CPU: 47 COMMAND: "kworker/u:6"
#0 [ffff898e35f159f0] machine_kexec at ffffffff8103abf9
#1 [ffff898e35f15a60] crash_kexec at ffffffff810b96e3
#2 [ffff898e35f15b30] oops_end at ffffffff8150f518
#3 [ffff898e35f15b60] no_context at ffffffff8104854c
#4 [ffff898e35f15ba0] __bad_area_nosemaphore at ffffffff81048675
#5 [ffff898e35f15bf0] bad_area_nosemaphore at ffffffff810487d3
#6 [ffff898e35f15c00] do_page_fault at ffffffff815120b8
#7 [ffff898e35f15d10] page_fault at ffffffff8150ea95
[exception RIP: unknown or invalid address]
RIP: 0000000000000000 RSP: ffff898e35f15dc8 RFLAGS: 00010282
RAX: 00000000fffffffe RBX: ffff889b77f6fc00 RCX:ffffffff81c99d88
RDX: 0000000000000000 RSI: ffff896019ee08e8 RDI:ffff889b77f6fc00
RBP: ffff898e35f15df0 R8: ffff896019ee08c8 R9:0000000000000000
R10: 0000000000000400 R11: 0000000000000000 R12:ffff896019ee08c0
R13: ffff889b77f6fe68 R14: ffffffff81c99d80 R15: ffffffffa022a1e0
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#8 [ffff898e35f15dc8] cma_ndev_work_handler at ffffffffa022a228 [rdma_cm]
#9 [ffff898e35f15df8] process_one_work at ffffffff8108a7c6
#10 [ffff898e35f15e58] worker_thread at ffffffff8108bda0
#11 [ffff898e35f15ee8] kthread at ffffffff81090fe6
PID: 45659 TASK: ffff880d313d2500 CPU: 31 COMMAND: "oracle_45659_ap"
#0 [ffff881024ccfc98] __schedule at ffffffff8150bac4
#1 [ffff881024ccfd40] schedule at ffffffff8150c2cf
#2 [ffff881024ccfd50] __mutex_lock_slowpath at ffffffff8150cee7
#3 [ffff881024ccfdc0] mutex_lock at ffffffff8150cdeb
#4 [ffff881024ccfde0] rdma_destroy_id at ffffffffa022a027 [rdma_cm]
#5 [ffff881024ccfe10] rds_ib_laddr_check at ffffffffa0357857 [rds_rdma]
#6 [ffff881024ccfe50] rds_trans_get_preferred at ffffffffa0324c2a [rds]
#7 [ffff881024ccfe80] rds_bind at ffffffffa031d690 [rds]
#8 [ffff881024ccfeb0] sys_bind at ffffffff8142a670
Race condition:
PID: 45659 PID: 47039
rds_ib_laddr_check
/*create id_priv with a null event_handler*/
rdma_create_id
rdma_bind_addr
cma_acquire_dev
/*add id_priv to cma_dev->id_list*/
cma_attach_to_dev
cma_ndev_work_handler
/*event_hanlder is null*/
id_priv->id.event_handler
Signed-off-by: Guanglei Li <guanglei.li@xxxxxxxxxx>
Signed-off-by: Honglei Wang <honglei.wang@xxxxxxxxxx>
---
drivers/infiniband/core/cma.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index e66963c..d9ca943 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -2431,9 +2431,12 @@ static void cma_ndev_work_handler(struct work_struct *_work)
id_priv->state == RDMA_CM_DEVICE_REMOVAL)
goto out;
- if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
- cma_exch(id_priv, RDMA_CM_DESTROYING);
- destroy = 1;
+ /*event_handler is null when create cm id by calling rds_ib_laddr_check*/
comment should be
/* xxxxx */
Zhu Yanjun
+ if (id_priv->id.event_handler) {
+ if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
+ cma_exch(id_priv, RDMA_CM_DESTROYING);
+ destroy = 1;
+ }
}
out:
--
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