Re: WITNESS + WITNESS_SKIPSPIN = panic
Peter Jeremy [EMAIL PROTECTED] writes: Is there any progress on fixing this? I posted a patch a couple of months ago. Search the archives. DES -- Dag-Erling Smorgrav - [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with unsubscribe freebsd-current in the body of the message
Re: WITNESS + WITNESS_SKIPSPIN = panic
On 2001-Apr-14 18:54:28 -0700, John Baldwin [EMAIL PROTECTED] wrote: On 14-Apr-01 Peter Jeremy wrote: Is there any progress on fixing this? Peter It panics? I'll see if I can reproduce this on Monday. I never use skipspin. A similar problem was reported here in mid-March, ending with the following message: On Mon, 12 Mar 2001 10:49:51 -0800 (PST), in [EMAIL PROTECTED], John Baldwin [EMAIL PROTECTED] wrote: Just don't use the skipspin stuff, it shouldn't hurt at all. The new witness code will hopefully be in by the end of the week. *crosses fingers* I bumped into the same problem last week and couldn't find anything that looked like a change in the skipspin behaviour since mid-March. Having looked in more detail at the previous thread, I suspect I may be seeing something different. In my case, the kernel is panicing very early during the boot process in either line 302 or 305 of /sys/kern/subr_witness.c in witness_initialize(): 299 /* First add in all the specified order lists. */ 300 for (order = order_lists; order-w_name != NULL; order++) { 301 w = enroll(order-w_name, order-w_class); 302 w-w_file = "order list"; 303 for (order++; order-w_name != NULL; order++) { 304 w1 = enroll(order-w_name, order-w_class); 305 w1-w_file = "order list"; 306 itismychild(w, w1); 307 w = w1; 308 } 309 } The problem is that enroll() will return NULL for spinlocks when witness_skipspin is set, but the above code always assumes it can de-reference the result from enroll(). (There are two other calls to enroll() where a NULL return appears to be acceptable). I don't understand the mutex initialisation well enough to be able to readily work out the correct fix. Peter To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
Re: WITNESS + WITNESS_SKIPSPIN = panic
On 16-Apr-01 Peter Jeremy wrote: On 2001-Apr-14 18:54:28 -0700, John Baldwin [EMAIL PROTECTED] wrote: On 14-Apr-01 Peter Jeremy wrote: Is there any progress on fixing this? Peter It panics? I'll see if I can reproduce this on Monday. I never use skipspin. A similar problem was reported here in mid-March, ending with the following message: On Mon, 12 Mar 2001 10:49:51 -0800 (PST), in [EMAIL PROTECTED], John Baldwin [EMAIL PROTECTED] wrote: Just don't use the skipspin stuff, it shouldn't hurt at all. The new witness code will hopefully be in by the end of the week. *crosses fingers* I bumped into the same problem last week and couldn't find anything that looked like a change in the skipspin behaviour since mid-March. Having looked in more detail at the previous thread, I suspect I may be seeing something different. In my case, the kernel is panicing very early during the boot process in either line 302 or 305 of /sys/kern/subr_witness.c in witness_initialize(): 299 /* First add in all the specified order lists. */ 300 for (order = order_lists; order-w_name != NULL; order++) { 301 w = enroll(order-w_name, order-w_class); 302 w-w_file = "order list"; 303 for (order++; order-w_name != NULL; order++) { 304 w1 = enroll(order-w_name, order-w_class); 305 w1-w_file = "order list"; 306 itismychild(w, w1); 307 w = w1; 308 } 309 } The problem is that enroll() will return NULL for spinlocks when witness_skipspin is set, but the above code always assumes it can de-reference the result from enroll(). (There are two other calls to enroll() where a NULL return appears to be acceptable). Argh, ok. I don't understand the mutex initialisation well enough to be able to readily work out the correct fix. I'll fix it later on today. Peter -- John Baldwin [EMAIL PROTECTED] -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
WITNESS + WITNESS_SKIPSPIN = panic
Is there any progress on fixing this? Peter To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
RE: WITNESS + WITNESS_SKIPSPIN = panic
On 14-Apr-01 Peter Jeremy wrote: Is there any progress on fixing this? Peter It panics? I'll see if I can reproduce this on Monday. I never use skipspin. -- John Baldwin [EMAIL PROTECTED] -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message