Re: Kernel with INVARIANTS panicing if drm is loaded

In reply to: Cy Schubert : "Re: Kernel with INVARIANTS panicing if drm is loaded"
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From: Oleg Nauman <oleg.nauman_at_gmail.com>
Date: Tue, 07 Nov 2023 15:51:47 UTC
On Tue, Nov 7, 2023 at 6:33 AM Cy Schubert <Cy.Schubert@cschubert.com>
wrote:

> In message <2806934.Tv9pZ1cZgq@moonset.home>, "Oleg V. Nauman" writes:
> >  I am observing kernel panic when entering multiuser mode after
> sucessful
> > system boot. It happens when I load CURRENT kernel with INVARIANTS and
> drm
> > module loaded ( drm-515-kmod-5.15.118_1 in particular ) . drm module and
> kene
> > l
> > are in sync
> >
> >
> > FreeBSD moonset.home 15.0-CURRENT FreeBSD 15.0-CURRENT #3 main-n266267-
> > e116e040f309: Sun Nov  5 10:00:51 EET 2023     root@moonset.home
> :/usr/obj/usr
> > /
> > src/amd64.amd64/sys/moonset  amd64
> >
> > panic: sleepq_add: td 0xfffff8000203c000 to sleep on wchan
> 0xfffff800021d8648
> >
> > with sleeping prohibited
> > ...............
> > Reading symbols from /boot/kernel/kernel...
> > Reading symbols from /usr/lib/debug//boot/kernel/kernel.debug...
> >
> > Unread portion of the kernel message buffer:
> > panic: malloc(M_WAITOK) with sleeping prohibited
> > cpuid = 0
> > time = 1699171621
> > .............
> > __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:57
> > 57              __asm("movq %%gs:%P1,%0" : "=r" (td) : "n"
> (offsetof(struct
> > pcpu,
> > (kgdb) #0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:57
> > #1  doadump (textdump=<optimized out>)
> >     at /usr/src/sys/kern/kern_shutdown.c:405
> > #2  0xffffffff81e2ec53 in vt_kms_postswitch () from /boot/modules/drm.ko
> > #3  0xffffffff8043ad6e in vt_window_switch (vw=0xfffff800021d8640)
> >     at /usr/src/sys/dev/vt/vt_core.c:595
> > #4  0xffffffff804ec583 in kern_reboot (howto=4)
> >     at /usr/src/sys/kern/kern_shutdown.c:501
> > #5  0xffffffff804eccfa in vpanic (
> >     fmt=0xffffffff808263fb "malloc(M_WAITOK) with sleeping prohibited",
> >     ap=ap@entry=0xfffffe00ce259850) at
> /usr/src/sys/kern/kern_shutdown.c:970
> > #6  0xffffffff804ecb03 in panic (fmt=<unavailable>)
> >     at /usr/src/sys/kern/kern_shutdown.c:894
> > #7  0xffffffff804c8a04 in malloc_dbg (vap=<optimized out>,
> >     sizep=<optimized out>, mtp=<optimized out>, flags=<optimized out>)
> >     at /usr/src/sys/kern/kern_malloc.c:540
> > #8  0xffffffff804c885c in malloc (size=<optimized out>,
> >     mtp=0xffffffff81e931c0 <M_KMALLOC>, flags=<unavailable>)
> >     at /usr/src/sys/kern/kern_malloc.c:641
> > #9  0xffffffff81c5a750 in intel_atomic_state_alloc ()
> >    from /boot/modules/i915kms.ko
> > #10 0xffffffff81dfe404 in drm_client_modeset_commit_atomic ()
> >    from /boot/modules/drm.ko
> > #11 0xffffffff81dfe614 in drm_client_modeset_commit_locked ()
> >    from /boot/modules/drm.ko
> > #12 0xffffffff81dfe7a1 in drm_client_modeset_commit ()
> >    from /boot/modules/drm.ko
> > #13 0xffffffff81e41ab3 in drm_fb_helper_restore_fbdev_mode_unlocked ()
> >    from /boot/modules/drm.ko
> > #14 0xffffffff81e2ed91 in vt_kms_postswitch () from /boot/modules/drm.ko
> > #15 0xffffffff8043ac31 in vt_window_switch (vw=0xfffff80001d3a600,
> >     vw@entry=0xffffffff80a47178 <vt_conswindow>)
> >     at /usr/src/sys/dev/vt/vt_core.c:612
> > #16 0xffffffff8043be0f in vtterm_cngrab (tm=<unavailable>,
> >     tm@entry=<error reading variable: value is not available>)
> >     at /usr/src/sys/dev/vt/vt_core.c:1863
> > #17 0xffffffff804893f6 in cngrab () at /usr/src/sys/kern/kern_cons.c:385
> > #18 0xffffffff804ecc79 in vpanic (
> >     fmt=0xffffffff808799a9 "%s: td %p to sleep on wchan %p with sleeping
> > prohibited", ap=ap@entry=0xfffffe00ce259c20)
> >     at /usr/src/sys/kern/kern_shutdown.c:942
> > #19 0xffffffff804ecb03 in panic (fmt=<unavailable>)
> >     at /usr/src/sys/kern/kern_shutdown.c:894
> > #20 0xffffffff805465b3 in sleepq_add (wchan=wchan@entry
> =0xfffff800021d8648,
> >     lock=lock@entry=0xfffff80001823340,
> >     wmesg=wmesg@entry=0xffffffff808b194e "tq_drain", flags=0,
> >     flags@entry=<unavailable>, queue=queue@entry=0)
> >     at /usr/src/sys/kern/subr_sleepqueue.c:326
> > #21 0xffffffff804f8efe in _sleep (ident=ident@entry=0xfffff800021d8648,
> >     lock=lock@entry=0xfffff80001823340, priority=priority@entry=0,
> >     wmesg=0xffffffff808b194e "tq_drain", sbt=sbt@entry=0, pr=pr@entry=0,
> >     flags=256) at /usr/src/sys/kern/kern_synch.c:207
> > #22 0xffffffff8054cffb in TQ_SLEEP (tq=0xfffff80001823300,
> >     p=0xfffff800021d8648, wm=<optimized out>)
> >     at /usr/src/sys/kern/subr_taskqueue.c:124
> > #23 taskqueue_drain (queue=0xfffff80001823300, task=0xfffff800021d8648)
> >     at /usr/src/sys/kern/subr_taskqueue.c:614
> > #24 0xffffffff81e2ed35 in vt_kms_postswitch () from /boot/modules/drm.ko
> > #25 0xffffffff8043ac31 in vt_window_switch (vw=0xfffff800021d8648,
> >     vw@entry=0xfffff800038fb180) at /usr/src/sys/dev/vt/vt_core.c:612
> > #26 0xffffffff8043b3b2 in vt_late_window_switch (vw=0xfffff800038fb180)
> >     at /usr/src/sys/dev/vt/vt_core.c:468
> > #27 vt_proc_window_switch (vw=0xfffff800038fb180)
> >     at /usr/src/sys/dev/vt/vt_core.c:553
> > #28 0xffffffff8043e318 in vt_processkey (
> >     kbd=0xffffffff80cef898 <default_kbd>, vd=0xffffffff80a472c8
> <vt_consdev>,
> >     c=<optimized out>) at /usr/src/sys/dev/vt/vt_core.c:903
> > #29 vt_kbdevent (kbd=0xffffffff80cef898 <default_kbd>, event=<optimized
> out>,
> >     arg=0xffffffff80a472c8 <vt_consdev>) at
> /usr/src/sys/dev/vt/vt_core.c:101
> > 8
> > #30 0xffffffff8078ffcf in atkbd_intr (kbd=0xffffffff80cef898
> <default_kbd>,
> >     arg=<optimized out>) at /usr/src/sys/dev/atkbdc/atkbd.c:565
> > #31 0xffffffff804b1376 in intr_event_execute_handlers
> (ie=0xfffff800010ece00,
> >     p=<optimized out>) at /usr/src/sys/kern/kern_intr.c:1205
> > #32 ithread_execute_handlers (ie=0xfffff800010ece00, p=<optimized out>)
> >     at /usr/src/sys/kern/kern_intr.c:1218
> > #33 ithread_loop (arg=arg@entry=0xfffff80001c5aea0)
> >     at /usr/src/sys/kern/kern_intr.c:1306
> > #34 0xffffffff804adae2 in fork_exit (
> >     callout=0xffffffff804b1120 <ithread_loop>, arg=0xfffff80001c5aea0,
> >     frame=0xfffffe00ce259f40) at /usr/src/sys/kern/kern_fork.c:1160
> > #35 <signal handler called>
> > #36 0x0000000000000b88 in ?? ()
> > Backtrace stopped: Cannot access memory at address 0xbc7
> > (kgdb)
> >
> >
> >
> >
> >
> >
>
> Can you submit a PR for this? GFP_KERNEL is an alias for M_WAITOK, which
> is
> verboten when intel_atomic_state_alloc() makes its call to kzalloc(), an
> alias for kmalloc().
>
>
>
Done,  https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274954

Thank you


> --
> Cheers,
> Cy Schubert <Cy.Schubert@cschubert.com>
> FreeBSD UNIX:  <cy@FreeBSD.org>   Web:  https://FreeBSD.org
> NTP:           <cy@nwtime.org>    Web:  https://nwtime.org
>
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