according some bug reports in sunsolve interrupt Level "N" may refers to a device, like Level 5 indicates that the problem is probably that of a cdrom drive
Level 15 from reading several sunsolve reports seems to indicate that Interrupt Level 15 related to volume manager or some "disk" controller related problem.
Do you have any jbod or san storage connected recently to your box? Or installed any patches/firmware related to it in recent memory?
The system is connected with a NAS server, the hardware connection was not changed since they were in solaris 8.
There are many coredumps under /var/crash/hostname, i've checked through these images by mdb, found CPU status and stack info are different each time, can you tell how can i parse the images of this kind of panic? The system is a cPCI processer card, with 650MHz sparc cpu.
A sample piece of messages around the panic is below:
Jul 31 19:19:51 vzss7sip2 xntpd[232]: [ID 774427 daemon.notice] time reset (step) 3.113106 s
Jul 31 19:20:32 vzss7sip2 fxp: [ID 786680 kern.notice] fxp1 : No response from Ethernet network : Link down -- cable problem?
Jul 31 19:24:16 vzss7sip2 unix: [ID 257829 kern.warning] WARNING: interrupt 0x7c0 at level 15 not serviced
Jul 31 19:24:16 vzss7sip2 unix: [ID 836849 kern.notice]
Jul 31 19:24:16 vzss7sip2 ^Mpanic[cpu0]/thread=2a100117cc0:
Jul 31 19:24:16 vzss7sip2 unix: [ID 534432 kern.notice] dispatcher invoked from high-level interrupt handler
Jul 31 19:24:16 vzss7sip2 unix: [ID 100000 kern.notice]
Jul 31 19:24:16 vzss7sip2 genunix: [ID 672855 kern.notice] syncing file systems...