Date: Tue, 15 Dec 2015 14:20:16 -0500 From: Shawn Webb <shawn.webb@hardenedbsd.org> To: Fabian Keil <freebsd-listen@fabiankeil.de> Cc: FreeBSD Current <freebsd-current@freebsd.org>, Oliver Pinter <oliver.pinter@hardenedbsd.org> Subject: Re: fork_findpid() - Fatal trap 12: page fault while in kernel mode Message-ID: <20151215192016.GC73098@mutt-hardenedbsd> In-Reply-To: <20151215174238.2d7cc3bb@fabiankeil.de> References: <20151215174238.2d7cc3bb@fabiankeil.de>
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--UPT3ojh+0CqEDtpF Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Dec 15, 2015 at 05:42:38PM +0100, Fabian Keil wrote: > I've seen the following panic a couple of times in the last three > months, usually while poudriere was running and with sh being the > current process. >=20 > This one is from a system based on r290926 running with > kern.randompid=3D9001 and forking frequently (>1000 forks/second) > due to poudriere and afl-fuzz: >=20 > Fatal trap 12: page fault while in kernel mode > cpuid =3D 1; apic id =3D 04 > fault virtual address =3D 0x618b00a8 > fault code =3D supervisor read data, page not present > instruction pointer =3D 0x20:0xffffffff80909158 > stack pointer =3D 0x28:0xfffffe011e03b940 > frame pointer =3D 0x28:0xfffffe011e03b960 > 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 71325 (sh) > trap number =3D 12 > panic: page fault > cpuid =3D 1 > KDB: stack backtrace: > [...] > Uptime: 13d20h43m20s > [...] Hey Fabien, I'm glad you've seen this, too. We've observed this in HardenedBSD, especially when running Poudriere and Jenkins. I think Oliver Pinter might have a potential patch to fix this. I've CC'd him on this thread. Thanks, --=20 Shawn Webb HardenedBSD GPG Key ID: 0x6A84658F52456EEE GPG Key Fingerprint: 2ABA B6BD EF6A F486 BE89 3D9E 6A84 658F 5245 6EEE --UPT3ojh+0CqEDtpF Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJWcGfuAAoJEGqEZY9SRW7uiK0QAJg8mym9cN4a+a4S5mZI///V 72UTg3v4gdJaRsSWPX2LjAu6rMgQ0KzL0FPlPdYTLhNzf0htsA59bFMf2mQ8Pu+h S/oi6EHN3dTZRQopTlus6dLkbTl1irQlgpOuWvVvOClSQbVEp/EOTJjnYvqnqjsI Q7wQnvmYqaOvthCg+YM6VzPndc01o8b8de0YLby3o+Spq0q1nhGbcOvoPNCbBqmp T634KDKRv3a4y1idrsDwS1CY4OR4ifnypuqZL5PBqdWpJdzUNwgslcJvOxG0/fPD JWnTIQMT0mGEZRKSM9K6iMj6Rq4U8Ylya4K1TpN1gVlCZihaO8OwMJG0brw4pYsK KMHQBMQMIXA2RvQBRHRRpfRjoxbfRNM0GA/L7v0p454f+8qgRGHcLFzSTRk3OD7L KxeJbGJ51Cf1VwUEiX/VZ4a1YkhPm6eaxQIeIeG+shFV5/zuCg09mwF7cT5gDtPG v+fNz/ConHToL7O2oWoZqDdAFOUHT9uZsop8UrejLeimdH29U/nz4HjSBZ2EPtCS +BHVfvB4itnTBQ0JQSVeTP1znj5r0zweR+vpTB5sSO64wk5azcyjhSu4EvaR4aRn BGnMs2J4Qzr87n1Dnj7F4658RABH4jXMt0Aim8I/2SXazZJZUUidn4kIJDeHEy0h Thf/P8XabBYNuPxpJUDV =o5YC -----END PGP SIGNATURE----- --UPT3ojh+0CqEDtpF--
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