Date: Mon, 10 Aug 2020 09:41:08 +0100 From: Alexandre Levy <a13xlevy@gmail.com> To: Hans Petter Selasky <hps@selasky.org> Cc: freebsd-current@freebsd.org Subject: Re: Kernel crash during video transcoding Message-ID: <CAEWSB323KtVrixgRyKsekdgcGjFm4kUqG6qDE59Aev3Cc6sYBg@mail.gmail.com> In-Reply-To: <13793020-1bde-b13f-65e3-909e27d876ad@selasky.org> References: <CAEWSB323c2zapSG30OS5T30Wd_bpT=7NbvrPtsyQDRRHQUf7qA@mail.gmail.com> <13793020-1bde-b13f-65e3-909e27d876ad@selasky.org>
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I'm recompiling the kernel using GENERIC at the moment but I'm not sure how to enable debugging in i915 kms, there is no compile option for that, am I missing something ? Le lun. 10 ao=C3=BBt 2020 =C3=A0 08:44, Hans Petter Selasky <hps@selasky.or= g> a =C3=A9crit : > Hi, > > On 2020-08-10 00:19, Alexandre Levy wrote: > > Hi, > > > > I installed the port drm-devel-kmod for Plex to be able to transcode > videos > > using the integrated GPU of my Intel Celeron G5900. > > > > I'm running r364031 and the kernel is compiled with GENERIC-NODEBUG > profile. > > > > Transcoding has been working fine for quite a while now but one video > > transcoding is causing a kernel panic that is reproducible all the time > > with that particular video. It seems like it's caused by the i915kms > module > > (call of i915_gms_fault() in the stack) : > > If you compile the kernel using GENERIC and then enable debugging in the > i915 kms and reproduce, we might get a more clear picture! > > It is a so called NULL pointer you've experienced. > > --HPS > > > > > Fatal trap 12: page fault while in kernel mode > > cpuid =3D 0; apic id =3D 00 > > fault virtual address =3D 0xdf > > fault code =3D supervisor read data, page not present > > instruction pointer =3D 0x20:0xffffffff80bdd2b4 > > stack pointer =3D 0x0:0xfffffe00d2be56d0 > > frame pointer =3D 0x0:0xfffffe00d2be56d0 > > code segment =3D base 0x0, limit 0xfffff, type 0x1b > > =3D DPL 0, pres 1, long 1, def32 0, gran 1 > > processor eflags =3D interrupt enabled, resume, IOPL =3D 0 > > current process =3D 4611 (Plex Transcoder) > > trap number =3D 12 > > panic: page fault > > cpuid =3D 0 > > time =3D 1596976796 > > KDB: stack backtrace: > > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame > > 0xfffffe00d2be5390 > > vpanic() at vpanic+0x182/frame 0xfffffe00d2be53e0 > > panic() at panic+0x43/frame 0xfffffe00d2be5440 > > trap_fatal() at trap_fatal+0x387/frame 0xfffffe00d2be54a0 > > trap_pfault() at trap_pfault+0x4f/frame 0xfffffe00d2be54f0 > > trap() at trap+0x271/frame 0xfffffe00d2be5600 > > calltrap() at calltrap+0x8/frame 0xfffffe00d2be5600 > > --- trap 0xc, rip =3D 0xffffffff80bdd2b4, rsp =3D 0xfffffe00d2be56d0, r= bp =3D > > 0xfffffe00d2be56d0 --- > > _rw_wowned() at _rw_wowned+0x4/frame 0xfffffe00d2be56d0 > > vm_page_busy_acquire() at vm_page_busy_acquire+0x141/frame > > 0xfffffe00d2be5710 > > remap_io_mapping() at remap_io_mapping+0x120/frame 0xfffffe00d2be5760 > > i915_gem_fault() at i915_gem_fault+0x25f/frame 0xfffffe00d2be57d0 > > linux_cdev_pager_populate() at linux_cdev_pager_populate+0x11b/frame > > 0xfffffe00d2be5840 > > vm_fault() at vm_fault+0x3d1/frame 0xfffffe00d2be5950 > > vm_fault_trap() at vm_fault_trap+0x60/frame 0xfffffe00d2be5990 > > trap_pfault() at trap_pfault+0x19c/frame 0xfffffe00d2be59e0 > > trap() at trap+0x3f1/frame 0xfffffe00d2be5af0 > > calltrap() at calltrap+0x8/frame 0xfffffe00d2be5af0 > > --- trap 0xc, rip =3D 0x80296659a, rsp =3D 0x7fffffffbd38, rbp =3D 0x80= fc00000 > --- > > KDB: enter: panic > > > > I don't see any crash dump in /var/crash despite having the right > > configuration and I should have enough space on my swap device (128GB U= SB > > drive) : > > > > $ cat /etc/rc.conf | grep dump > > dumpdev=3D"AUTO" > > > > $ swapinfo > > Device 1K-blocks Used Avail Capacity > > /dev/gpt/crash0 121307096 0 121307096 0% > > > > $ cat /etc/fstab > > /dev/gpt/crash0 none swap sw 0 0 > > > > $ dumpon -l > > gpt/crash0 > > > > Not sure why no dump was generated, is it because the kernel was compil= ed > > with the GENERIC-NODEBUG profile ? However I see various KDB options in > the > > GENERIC profile that are inherited by GENERIC-NODEBUG. > > > > Happy to recompile the kernel with GENERIC profile if it's required. > > > > Thank you. > > _______________________________________________ > > freebsd-current@freebsd.org mailing list > > https://lists.freebsd.org/mailman/listinfo/freebsd-current > > To unsubscribe, send any mail to " > freebsd-current-unsubscribe@freebsd.org" > > > >
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