Date: Fri, 30 Nov 2012 18:47:15 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: sig6247 <sig6247@gmail.com> Cc: freebsd-current@freebsd.org, fs@freebsd.org Subject: Re: clang compiled kernel panic when mounting zfs root on i386 Message-ID: <20121130164715.GW3013@kib.kiev.ua> In-Reply-To: <50b8a9c5.e64dec0a.1d88.133a@mx.google.com> References: <50b37d46.8584440a.735c.ffffb4e6@mx.google.com> <20121126171658.GD3013@kib.kiev.ua> <20121127071243.D1255@besplex.bde.org> <20121129232944.GQ3013@kib.kiev.ua> <50b8a9c5.e64dec0a.1d88.133a@mx.google.com>
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[-- Attachment #1 --] On Fri, Nov 30, 2012 at 04:42:45AM -0800, sig6247 wrote: > On Fri, 30 Nov 2012 01:29:44 +0200, Konstantin Belousov <kostikbel@gmail.com> wrote: > > > Please apply the patch below and obtain the backtrace of the double fault > > panic again. I will commit the patch later. > > Thanks for the patch. > > WARNING: WITNESS option enabled, expect reduced performance. > Trying to mount root from zfs:zroot []... > > Fatal double fault: > eip = 0xc0e93e07 > esp = 0xc86bffbc > ebp = 0xc86c0032 > cpuid = 1; apic id = 01 > panic: double fault > cpuid = 1 > KDB: enter: panic > [ thread pid 1 tid 100002 ] > Stopped at kdb_enter+0x3d: movl $0,kdb_why > db> bt > Tracing pid 1 tid 100002 td 0xc89efbc0 > kdb_enter(c1065960,c1065960,c10b903b,c139f438,aef01785,...) at kdb_enter+0x3d/frame 0xc139f3f0 > panic(c10b903b,1,1,1,c86c0032,...) at panic+0x14b/frame 0xc139f42c > dblfault_handler() at dblfault_handler+0xab/frame 0xc139f42c > --- trap 0x17, eip = 0xc0e93e07, esp = 0xc86bffbc, ebp = 0xc86c0032 --- > __qdivrem(0,aba80000,c10d,98600000,68c119,...) at __qdivrem+0x197/frame 0xc86c0032 > db> Hm, this is not very useful. Although the panic is again caused by the stack overflow, most likely (please also include the output of the "show thread" from ddb), it is at different place, and probably at the leaf function. Can you try some more times, so that we could see 'big' backtrace ? [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iQIcBAEBAgAGBQJQuOMTAAoJEJDCuSvBvK1Bfb4QAKfQlzWqbvLNxc0iMg7NQlJ8 ZlJanY91GWIuZbgtSYSwkLZ0mJ0xhHgCRGJLFnVncZGY56bPmIDnkV0h776RY7RU 2fH1BI2QLCEVqRH/y4n3uoJZRfdZ2xrqRuvw3qkWQ5xUbMgTFZamckv1Z0rTsp9w NKwzFcWBGvZeioJJALMDbKr4FtmPeFK1K61aQlAL2WzwbTn7xd3Iqs9CrMm8oUEi FMl3mHajW61g2dYY1LwxEpR4/GnMmJARFqMRugN68W0PyfXvYfX7QFJcL/TuZZHS 3pl3fvVIR00sCmEwT1xYyI4Q9oF/5Hs5ybFFFBkLX0CABXyVoAZbUo/Z+JldM6SQ VgjMF+qucbcacBCYerSXjTQv0Hv+3P4ALMepJBuwiE/DCwnWe4UO3LhpUx1rVR5X 8siL9sE4u0qkyxirti7TTlOQS30MEneyYtybNQaiY3cn5YCrCy5otovc047hd65w JIX6I5R0ZS84KoXQe/gfyOcWz87zfFInVfRWevz62x7rfQqF3srlIenpfE1d0ZP1 qRYKGZcRiR02RACoLerlTKukj6ZzXK0XXTt84GZaqzUZvb3tzYS6e22gAEKRd7T6 xcvNILDcPaUHRRLr8+OPGPJNj0ZpKkeGT9EtVWSXBz+Sy+v7jB+nF8Yw4Y85DvnO 4UPihvsOQq9VptkFTkn0 =rLF0 -----END PGP SIGNATURE-----
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