Re: kern/57226: NetBSD 10_BETA kernel crash

[Takahiro Kambe <taca%back-street.net@localhost>]

The following reply was made to PR kern/57226; it has been noted by GNATS.

From: Takahiro Kambe <taca%back-street.net@localhost>
To: martin%duskware.de@localhost
Cc: gnats-bugs%netbsd.org@localhost
Subject: Re: kern/57226: NetBSD 10_BETA kernel crash
Date: Tue, 14 Feb 2023 14:18:41 +0900 (JST)

 In message <20230213150322.GB4036%mail.duskware.de@localhost>
 	on Mon, 13 Feb 2023 16:03:22 +0100,
 	Martin Husemann <martin%duskware.de@localhost> wrote:
 > You do not need a kernel core dump for that, just the /netbsd you were
 > using at the time of the crash (or even better: the netbsd.gdb version
 > if you happen to have that in your kernel build directory).
 Oh. I see.  Here it is.
 
 >> >  Can you use gdb (or addr2line) to identify the two functions mentioned
 >> >  in the panic? Something like
 >> >  
 >> >   gdb> list *(0xffffffff80dea0a3)
 (gdb) list *(0xffffffff80dea0a3)
 0xffffffff80dea0a3 is in itimer_callout (/data/netbsd/src/sys/kern/kern_time.c:834).
 829      *      N.B. A delay in processing this callout causes multiple
 830      *      SIGALRM calls to be compressed into one.
 831      */
 832     static void
 833     itimer_callout(void *arg)
 834     {
 835             uint64_t last_val, next_val, interval, now_ns;
 836             struct timespec now, next;
 837             struct itimer * const it = arg;
 838             int backwards;
 
 
 >> >   gdb> list *(0xffffffff80e34fc9)
 (gdb) list *(0xffffffff80e34fc9)
 0xffffffff80e34fc9 is in timerfd_fop_close (/data/netbsd/src/sys/kern/sys_timerfd.c:194).
 189     
 190             itimer_lock();
 191             itimer_poison(&tfd->tfd_itimer);
 192             itimer_fini(&tfd->tfd_itimer);  /* drops itimer lock */
 193     
 194             cv_destroy(&tfd->tfd_read_wait);
 195     
 196             seldestroy(&tfd->tfd_read_sel);
 197     
 198             kmem_free(tfd, sizeof(*tfd));
 
 -- 
 Takahiro Kambe <taca%back-street.net@localhost>