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tracing of active sockets and handles

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If NETMGR_TRACE is defined, we now maintain a list of active sockets
in the netmgr object and a list of active handles in each socket
object; by walking the list and printing `backtrace` in a debugger
we can see where they were created, to assist in in debugging of
reference counting errors.

On shutdown, if netmgr finds there are still active sockets after
waiting, isc__nm_dump_active() will be called to log the list of
active sockets and their underlying handles, along with some details
about them.
This commit is contained in:
Witold Kręcicki
2020-09-02 17:57:44 +02:00
committed by Evan Hunt
parent 2f2d60a989
commit 00e04a86c8
2 changed files with 147 additions and 2 deletions
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29
lib/isc/netmgr/netmgr-int.h
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@@ -49,6 +49,20 @@
#define ISC_NETMGR_RECVBUF_SIZE (65536)
#endif
/*
* Define NETMGR_TRACE to activate tracing of handles and sockets.
* This will impair performance but enables us to quickly determine,
* if netmgr resources haven't been cleaned up on shutdown, which ones
* are still in use.
*/
#ifdef NETMGR_TRACE
#define TRACE_SIZE 8
void
isc__nm_dump_active(isc_nm_t *nm);
#endif
/*
* Single network event loop worker.
*/
@@ -104,6 +118,11 @@ struct isc_nmhandle {
isc_sockaddr_t local;
isc_nm_opaquecb_t doreset; /* reset extra callback, external */
isc_nm_opaquecb_t dofree; /* free extra callback, external */
#ifdef NETMGR_TRACE
void *backtrace[TRACE_SIZE];
int backtrace_size;
LINK(isc_nmhandle_t) active_link;
#endif
void *opaque;
char extra[];
};
@@ -308,6 +327,10 @@ struct isc_nm {
uint32_t idle;
uint32_t keepalive;
uint32_t advertised;
#ifdef NETMGR_TRACE
ISC_LIST(isc_nmsocket_t) active_sockets;
#endif
};
typedef enum isc_nmsocket_type {
@@ -524,6 +547,12 @@ struct isc_nmsocket {
isc_nm_accept_cb_t accept_cb;
void *accept_cbarg;
#ifdef NETMGR_TRACE
void *backtrace[TRACE_SIZE];
int backtrace_size;
LINK(isc_nmsocket_t) active_link;
ISC_LIST(isc_nmhandle_t) active_handles;
#endif
};
bool