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7b6275c80a
In the event that rpcrdma_post_recvs() fails to create a work request
(due to memory allocation failure, say) or otherwise exits early, we
should decrement ep->re_receiving before returning. Otherwise we will
hang in rpcrdma_xprt_drain() as re_receiving will never reach zero and
the completion will never be triggered.
On a system with high memory pressure, this can appear as the following
hung task:
INFO: task kworker/u385:17:8393 blocked for more than 122 seconds.
Tainted: G S E 6.19.0 #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u385:17 state:D stack:0 pid:8393 tgid:8393 ppid:2 task_flags:0x4248060 flags:0x00080000
Workqueue: xprtiod xprt_autoclose [sunrpc]
Call Trace:
<TASK>
__schedule+0x48b/0x18b0
? ib_post_send_mad+0x247/0xae0 [ib_core]
schedule+0x27/0xf0
schedule_timeout+0x104/0x110
__wait_for_common+0x98/0x180
? __pfx_schedule_timeout+0x10/0x10
wait_for_completion+0x24/0x40
rpcrdma_xprt_disconnect+0x444/0x460 [rpcrdma]
xprt_rdma_close+0x12/0x40 [rpcrdma]
xprt_autoclose+0x5f/0x120 [sunrpc]
process_one_work+0x191/0x3e0
worker_thread+0x2e3/0x420
? __pfx_worker_thread+0x10/0x10
kthread+0x10d/0x230
? __pfx_kthread+0x10/0x10
ret_from_fork+0x273/0x2b0
? __pfx_kthread+0x10/0x10
ret_from_fork_asm+0x1a/0x30
Fixes:
|
History
|
|
|---|---|---|
| .. | ||
| auth_gss | ||
| xprtrdma | ||
| .kunitconfig | ||
| addr.c | ||
| auth.c | ||
| auth_null.c | ||
| auth_tls.c | ||
| auth_unix.c | ||
| backchannel_rqst.c | ||
| cache.c | ||
| clnt.c | ||
| debugfs.c | ||
| fail.h | ||
| Kconfig | ||
| Makefile | ||
| netns.h | ||
| rpc_pipe.c | ||
| rpcb_clnt.c | ||
| sched.c | ||
| socklib.c | ||
| socklib.h | ||
| stats.c | ||
| sunrpc.h | ||
| sunrpc_syms.c | ||
| svc.c | ||
| svc_xprt.c | ||
| svcauth.c | ||
| svcauth_unix.c | ||
| svcsock.c | ||
| sysctl.c | ||
| sysfs.c | ||
| sysfs.h | ||
| timer.c | ||
| xdr.c | ||
| xprt.c | ||
| xprtmultipath.c | ||
| xprtsock.c | ||