Date: Mon, 06 Nov 2023 20:32:21 -0800 From: Cy Schubert <Cy.Schubert@cschubert.com> To: "Oleg V. Nauman" <oleg.nauman@gmail.com> Cc: FreeBSD Current <current@freebsd.org>, manu@freebsd.org Subject: Re: Kernel with INVARIANTS panicing if drm is loaded Message-ID: <20231107043221.A4E1CFA@slippy.cwsent.com> In-Reply-To: <2806934.Tv9pZ1cZgq@moonset.home> References: <2806934.Tv9pZ1cZgq@moonset.home>
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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().
--
Cheers,
Cy Schubert <Cy.Schubert@cschubert.com>
FreeBSD UNIX: <cy@FreeBSD.org> Web: https://FreeBSD.org
NTP: <cy@nwtime.org> Web: https://nwtime.org
e^(i*pi)+1=0
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