BUG: unable to handle kernel NULL pointer dereference at (null)

I am running a Java (TIBCO EBX) in linux server with 192 GB RAM and we are constantly seeing Java process getting restarted and application will go into hang state, with High Memory alerts. We had set the heap size as 176 GB and we are seeing Heap size is getting full after 10 hours of interval with memory utilization never going down. If we restart the server, memory utilization will go down. We tried to get the Kdump for the server to analyze memory leak and in vmcore-dmesg.txt, we are seeing below entries. Can anyone suggest if this is causing our memory leak and how we can fix this issue ?

[  389.832835] SysRq : Trigger a crash
[  390.049124] BUG: unable to handle kernel NULL pointer dereference at           (null)
[  390.050076] IP: [<ffffffffbb270326>] sysrq_handle_crash+0x16/0x20
[  390.050076] PGD 80000017c6c6e067 PUD 17fa9c8067 PMD 0

Our Kernel version is below :-

$uname -r 
3.10.0-1062.52.2.el7.x86_64

$ uname -a
Linux sr001 3.10.0-1062.52.2.el7.x86_64 #1 SMP Thu Jul 8 09:03:01 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Any other advice/suggestion to look.

The kernel dmesg messages are a result of deliberately triggering a crash through the SysRq mechanism (either using the magic SysRq key combination Alt-SysRq followed by c, or by writing c to the "/proc/sysrq-trigger" file). (Those require the SysRq mechanism to be enabled in the kernel.) They are unrelated to the memory leak.

When the kernel crash is triggered by the SysRq mechanism, the sysrq_handle_crash() function in "drivers/tty/sysrq.c" (since kernel 2.6.37). For the 3.10 kernel, it the function definition is as follows:

static void sysrq_handle_crash(int key)
{
	char *killer = NULL;

	panic_on_oops = 1;	/* force panic */
	wmb();
	*killer = 1;
}

That *killer = 1; line triggers the bug that results in a kernel panic. But it is not really a bug because it was deliberately done that way.

No doubt the BUG: message will have alarmed some people. In kernel 5.0, the function was changed to avoid the deliberate null pointer dereference and just call panic() directly, as follows:

static void sysrq_handle_crash(int key)
{
	/* release the RCU read lock before crashing */
	rcu_read_unlock();

	panic("sysrq triggered crash\n");
}

(The rcu_read_unlock() call is only there because rcu_read_lock() is called before this function is called.)

I suspect the memory leak is probably in the application rather than in the kernel. One way to tell is by killing the application. If the memory leak is in the application, the memory usage should return to normal when its processes are killed. If the memory leak is in the kernel, the memory remains unavailable for further use until the kernel is rebooted.