Date: Thu, 13 Jan 2005 15:48:56 -0500 From: Anish Mistry <mistry.7@osu.edu> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: propagate_priority panic [backtrace] Message-ID: <200501131549.08903.mistry.7@osu.edu> In-Reply-To: <200501131348.37699.jhb@FreeBSD.org> References: <200501130111.04893.mistry.7@osu.edu> <200501131127.10811.mistry.7@osu.edu> <200501131348.37699.jhb@FreeBSD.org>
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--nextPart1896723.jU0RUahIWr Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Thursday 13 January 2005 01:48 pm, John Baldwin wrote: > On Thursday 13 January 2005 11:27 am, Anish Mistry wrote: > > On Thursday 13 January 2005 01:10 am, Anish Mistry wrote: > > > Not sure if anyone else is seeing this, but I'm pretty sure the > > > following commit broke my system. When mysql tries to shutdown I get= a > > > panic in propagate_priority. As well as X freezing when I go to start > > > it. Actually one of the applictions or the WM causes it to freeze, but > > > same problem I think but I can't see the console. Before this > > > everything worked fine. I can post the hand transcribed panic > > > backtrace message tomorrow if anyone is interested since I don't have= a > > > serial port on the machine. > > > I'm using the 4BSD scheduler with the latest -CURRENT. > > > > > > jhb 2004-12-30 20:52:44 UTC > > > > > > FreeBSD src repository > > > > > > Modified files: > > > sys/kern sched_4bsd.c sched_ule.c subr_turnstile.c > > > sys/sys proc.h sched.h turnstile.h > > > > > > Revision Changes Path > > > 1.71 +102 -14 src/sys/kern/sched_4bsd.c > > > 1.144 +77 -20 src/sys/kern/sched_ule.c > > > 1.151 +120 -71 src/sys/kern/subr_turnstile.c > > > 1.415 +1 -0 src/sys/sys/proc.h > > > 1.23 +2 -0 src/sys/sys/sched.h > > > 1.6 +1 -0 src/sys/sys/turnstile.h > > > > Dmesg and kernel config attached. > > Ok, here is the panic and backtrace: > > kernel trap 12 with interrupts disabled > > > > > > Fatal trap 12: page fault while in kernel mode > > fault virtual address =3D 0x4 > > fault code =3D supervisor read, page not present > > instruction pointer =3D 0x8:0xc04d5a4f > > stack pointer =3D 0x10:0xcc53bbdc > > frame pointer =3D 0x10:0xcc53bbec > > code segment =3D base 0x0, limit 0xfffff, type 0x1b > > =3D DPL 0, pres 1, def32 1, gran 1 > > processor eflags =3D resume, IOPL =3D 0 > > current process =3D 628 (mysqld) > > [thread pid 628 tid 100085 ] > > Stopped at propagate_priority+0x153: pushl 0x4(%eax) > > db> tr > > Tracing pid 628 tid 100085 td 0xc14e4730 > > propagate_priority(c0645cb4,c0645cb0,c15ac650,c14e4730,c14e4730) at > > propagate_priority+0x153 > > turnstile_wait(c15as650,c15ac650,2,c05f401e,21e) at turnstile_wait+0x1ae > > _mtx_lock_sleep(c15ac650,c14e4730,0,c05f8604,206) at _mtx_lock_sleep+0x= 85 > > _mtx_lock_flags(c15ac650,0,c05f8604,206,c15ac650) at _mtx_lock_flags+0x= 50 > > sleepq_calc_signal_retval(0,0,100,ci4e4730,8476f4c) at > > sleep_calc_signal_retval+0x2b > > msleep(c10bb334,c15ac650,168,c05f399a,402) at msleep+0x3eb > > kse_release(c14e4730,cc53bd14,1,12,296) at kse_release+0x186 > > syscall(2f,2f,2f,8472000,0) at syscall+0x128 > > Xint-x80_syscall() at Xint0x80_syscall+0x1f > > --- syscall (383, FreeBSD ELF32, kse_release), eip =3D 0x285851eb, esp = =3D > > 0x8476f28, ebp =3D 0x8476f64 > > Does this still happen if you turn FULL_PREEMPTION off? Note from NOTES: > > # FULL_PREEMPTION instructs the kernel to preempt non-realtime kernel > # threads. Its sole use is to expose race conditions and other > # bugs during development. Enabling this option will reduce > # performance and increase the frequency of kernel panics by > # design. If you aren't sure that you need it then you don't. > # Relies on the PREEMPTION option. DON'T TURN THIS ON. Yeah, that was it. =2D-=20 Anish Mistry --nextPart1896723.jU0RUahIWr Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (FreeBSD) iD8DBQBB5t7ExqA5ziudZT0RAgHUAJ9toIUhMI4q3GzePmvwQlv4opDXdACgp1ds eKQg87YgEBYDnQwmf6hYDkQ= =eubF -----END PGP SIGNATURE----- --nextPart1896723.jU0RUahIWr--
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