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Date: Wed, 18 Apr 2018 06:54:38 -0700 From: Matthew Wilcox <willy@...radead.org> To: Josh Poimboeuf <jpoimboe@...hat.com> Cc: x86@...nel.org, linux-kernel@...r.kernel.org Subject: ORC unwinder bad backtrace [there's no entry in MAINTAINERS for the ORC unwinder. I'm guessing at the mailing lists that might be interested in this] I've done something stupid and fallen off the end of the stack. ORC appears not to handle this very well (see backtrace at the bottom). Look at this loop: [ 60.750032] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.750750] ? do_page_fault+0x85/0xf0 [ 60.751327] ? async_page_fault+0x1e/0x30 [ 60.751970] ? pte_clear.constprop.18+0x2e/0x2e [ 60.752607] ? perf_trace_x86_exceptions+0x44/0x100 The instruction at pte_clear.constprop.18+0x2e/0x2e is a nop (as you might expect for the last byte of a function), so that can't be right: ffffffff81061192 <pte_clear.constprop.18>: ... ffffffff810611bf: 90 nop ffffffff810611c0 <perf_trace_x86_exceptions>: I suspect an off-by-one error; you don't really mean to point to the byte before perf_trace_x86_exception, you mean to point to byte 0 of perf_trace_x86_exception. I'm going to archive up this compilation in case there's anything useful I can extract for you from it later. [ 60.734865] BUG: stack guard page was hit at 0000000020ffe8f7 (stack is 00000000d090cc16..00000000cd7d843a) [ 60.736511] kernel stack overflow (double-fault): 0000 [#1] SMP PTI [ 60.737468] Modules linked in: [ 60.737979] CPU: 0 PID: 1 Comm: init Not tainted 4.17.0-rc1+ #30 [ 60.738884] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1 04/01/2014 [ 60.740143] RIP: 0010:error_entry+0x12/0x100 [ 60.740882] RSP: 0018:ffffb050000d0000 EFLAGS: 00010046 [ 60.741701] RAX: 0000000000000000 RBX: ffffd04fffc042f8 RCX: 0000000000000000 [ 60.742707] RDX: 0000000000000000 RSI: ffffffffb5c010a8 RDI: ffffffffb6425d20 [ 60.743694] RBP: ffffb050000d0090 R08: ffffffffb54611c0 R09: 0000000000000000 [ 60.744687] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffb6425d20 [ 60.745673] R13: ffffd04fffc042f8 R14: 0000000000000000 R15: ffffb050000d00c8 [ 60.746640] FS: 00007fec2d341700(0000) GS:ffff9d42df800000(0000) knlGS:0000000000000000 [ 60.747804] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 60.748620] CR2: ffffb050000cfff8 CR3: 000000001c974003 CR4: 00000000003606f0 [ 60.749607] Call Trace: [ 60.750032] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.750750] ? do_page_fault+0x85/0xf0 [ 60.751327] ? async_page_fault+0x1e/0x30 [ 60.751970] ? pte_clear.constprop.18+0x2e/0x2e [ 60.752607] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.753250] ? do_page_fault+0x85/0xf0 [ 60.753771] ? async_page_fault+0x1e/0x30 [ 60.754317] ? pte_clear.constprop.18+0x2e/0x2e [ 60.754920] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.755562] ? do_page_fault+0x85/0xf0 [ 60.756083] ? async_page_fault+0x1e/0x30 [ 60.756688] ? pte_clear.constprop.18+0x2e/0x2e [ 60.757622] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.758515] ? do_page_fault+0x85/0xf0 [ 60.759174] ? async_page_fault+0x1e/0x30 [ 60.759862] ? pte_clear.constprop.18+0x2e/0x2e [ 60.760633] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.761450] ? do_page_fault+0x85/0xf0 [ 60.762105] ? async_page_fault+0x1e/0x30 [ 60.762797] ? pte_clear.constprop.18+0x2e/0x2e [ 60.763562] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.764383] ? do_page_fault+0x85/0xf0 [ 60.765040] ? async_page_fault+0x1e/0x30 [ 60.765730] ? pte_clear.constprop.18+0x2e/0x2e [ 60.766495] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.767311] ? do_page_fault+0x85/0xf0 [ 60.767967] ? async_page_fault+0x1e/0x30 [ 60.768671] ? pte_clear.constprop.18+0x2e/0x2e [ 60.769449] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.770271] ? do_page_fault+0x85/0xf0 [ 60.770936] ? async_page_fault+0x1e/0x30 [ 60.771627] ? pte_clear.constprop.18+0x2e/0x2e [ 60.772398] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.773254] ? do_page_fault+0x85/0xf0 [ 60.773922] ? async_page_fault+0x1e/0x30 [ 60.774711] ? pte_clear.constprop.18+0x2e/0x2e [ 60.775537] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.776451] ? do_page_fault+0x85/0xf0 [ 60.777140] ? async_page_fault+0x1e/0x30 [ 60.777860] ? pte_clear.constprop.18+0x2e/0x2e [ 60.778628] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.779444] ? do_page_fault+0x85/0xf0 [ 60.780097] ? async_page_fault+0x1e/0x30 [ 60.780792] ? pte_clear.constprop.18+0x2e/0x2e [ 60.781571] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.782524] ? do_page_fault+0x85/0xf0 [ 60.783201] ? async_page_fault+0x1e/0x30 [ 60.783919] ? pte_clear.constprop.18+0x2e/0x2e [ 60.784698] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.785520] ? do_page_fault+0x85/0xf0 [ 60.786176] ? async_page_fault+0x1e/0x30 [ 60.786870] ? pte_clear.constprop.18+0x2e/0x2e [ 60.787641] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.788462] ? do_page_fault+0x85/0xf0 [ 60.789116] ? async_page_fault+0x1e/0x30 [ 60.789829] ? pte_clear.constprop.18+0x2e/0x2e [ 60.790652] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.791495] ? do_page_fault+0x85/0xf0 [ 60.792155] ? async_page_fault+0x1e/0x30 [ 60.792849] ? pte_clear.constprop.18+0x2e/0x2e [ 60.793630] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.794445] ? do_page_fault+0x85/0xf0 [ 60.795101] ? async_page_fault+0x1e/0x30 [ 60.795806] ? pte_clear.constprop.18+0x2e/0x2e [ 60.796576] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.797413] ? do_page_fault+0x85/0xf0 [ 60.798078] ? async_page_fault+0x1e/0x30 [ 60.798768] ? pte_clear.constprop.18+0x2e/0x2e [ 60.799550] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.800370] ? do_page_fault+0x85/0xf0 [ 60.801023] ? async_page_fault+0x1e/0x30 [ 60.801745] ? pte_clear.constprop.18+0x2e/0x2e [ 60.802529] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.803349] ? do_page_fault+0x85/0xf0 [ 60.804015] ? async_page_fault+0x1e/0x30 [ 60.804724] ? pte_clear.constprop.18+0x2e/0x2e [ 60.805495] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.806313] ? do_page_fault+0x85/0xf0 [ 60.806981] ? async_page_fault+0x1e/0x30 [ 60.807673] ? pte_clear.constprop.18+0x2e/0x2e [ 60.816987] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.817816] ? do_page_fault+0x85/0xf0 [ 60.818476] ? async_page_fault+0x1e/0x30 [ 60.819173] ? pte_clear.constprop.18+0x2e/0x2e [ 60.819950] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.820782] ? do_page_fault+0x85/0xf0 [ 60.821442] ? async_page_fault+0x1e/0x30 [ 60.822137] ? pte_clear.constprop.18+0x2e/0x2e [ 60.822905] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.823721] ? do_page_fault+0x85/0xf0 [ 60.824383] ? async_page_fault+0x1e/0x30 [ 60.825072] ? pte_clear.constprop.18+0x2e/0x2e [ 60.825832] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.826688] ? do_page_fault+0x85/0xf0 [ 60.827342] ? async_page_fault+0x1e/0x30 [ 60.828033] ? pte_clear.constprop.18+0x2e/0x2e [ 60.828805] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.829619] ? do_page_fault+0x85/0xf0 [ 60.830286] ? async_page_fault+0x1e/0x30 [ 60.830985] ? pte_clear.constprop.18+0x2e/0x2e [ 60.831762] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.832582] ? do_page_fault+0x85/0xf0 [ 60.833249] ? async_page_fault+0x1e/0x30 [ 60.833945] ? pte_clear.constprop.18+0x2e/0x2e [ 60.834723] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.835538] ? do_page_fault+0x85/0xf0 [ 60.836199] ? async_page_fault+0x1e/0x30 [ 60.836895] ? pte_clear.constprop.18+0x2e/0x2e [ 60.837663] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.838482] ? do_page_fault+0x85/0xf0 [ 60.839126] ? async_page_fault+0x1e/0x30 [ 60.839819] ? pte_clear.constprop.18+0x2e/0x2e [ 60.840591] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.841408] ? do_page_fault+0x85/0xf0 [ 60.842074] ? async_page_fault+0x1e/0x30 [ 60.842763] ? pte_clear.constprop.18+0x2e/0x2e [ 60.843550] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.844547] ? do_page_fault+0x85/0xf0 [ 60.845251] ? async_page_fault+0x1e/0x30 [ 60.845959] ? pte_clear.constprop.18+0x2e/0x2e [ 60.846793] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.847625] ? do_page_fault+0x85/0xf0 [ 60.848291] ? async_page_fault+0x1e/0x30 [ 60.848993] ? pte_clear.constprop.18+0x2e/0x2e [ 60.849759] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.850576] ? do_page_fault+0x85/0xf0 [ 60.851231] ? async_page_fault+0x1e/0x30 [ 60.851918] ? pte_clear.constprop.18+0x2e/0x2e [ 60.852698] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.853526] ? do_page_fault+0x85/0xf0 [ 60.854184] ? async_page_fault+0x1e/0x30 [ 60.854886] ? pte_clear.constprop.18+0x2e/0x2e [ 60.855655] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.856483] ? do_page_fault+0x85/0xf0 [ 60.857069] ? async_page_fault+0x1e/0x30 [ 60.857789] ? pte_clear.constprop.18+0x2e/0x2e [ 60.858554] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.859376] ? do_page_fault+0x85/0xf0 [ 60.860031] ? async_page_fault+0x1e/0x30 [ 60.860734] ? pte_clear.constprop.18+0x2e/0x2e [ 60.861512] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.862335] ? do_page_fault+0x85/0xf0 [ 60.863006] ? async_page_fault+0x1e/0x30 [ 60.863698] ? pte_clear.constprop.18+0x2e/0x2e [ 60.864483] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.865319] ? do_page_fault+0x85/0xf0 [ 60.865980] ? async_page_fault+0x1e/0x30 [ 60.866684] ? pte_clear.constprop.18+0x2e/0x2e [ 60.867453] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.868277] ? do_page_fault+0x85/0xf0 [ 60.868936] ? async_page_fault+0x1e/0x30 [ 60.869637] ? pte_clear.constprop.18+0x2e/0x2e [ 60.870404] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.871237] ? do_page_fault+0x85/0xf0 [ 60.871894] ? async_page_fault+0x1e/0x30 [ 60.872588] ? pte_clear.constprop.18+0x2e/0x2e [ 60.873368] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.874240] ? do_page_fault+0x85/0xf0 [ 60.875060] ? async_page_fault+0x1e/0x30 [ 60.875767] ? pte_clear.constprop.18+0x2e/0x2e [ 60.876571] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.877295] ? do_page_fault+0x85/0xf0 [ 60.877888] ? async_page_fault+0x1e/0x30 [ 60.878501] ? pte_clear.constprop.18+0x2e/0x2e [ 60.879177] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.879894] ? do_page_fault+0x85/0xf0 [ 60.880481] ? async_page_fault+0x1e/0x30 [ 60.881090] ? pte_clear.constprop.18+0x2e/0x2e [ 60.881774] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.882495] ? do_page_fault+0x85/0xf0 [ 60.883074] ? async_page_fault+0x1e/0x30 [ 60.883684] ? pte_clear.constprop.18+0x2e/0x2e [ 60.884376] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.885091] ? do_page_fault+0x85/0xf0 [ 60.885665] ? async_page_fault+0x1e/0x30 [ 60.886271] ? pte_clear.constprop.18+0x2e/0x2e [ 60.886944] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.887694] ? do_page_fault+0x85/0xf0 [ 60.888275] ? async_page_fault+0x1e/0x30 [ 60.888883] ? pte_clear.constprop.18+0x2e/0x2e [ 60.889557] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.890274] ? do_page_fault+0x85/0xf0 [ 60.890849] ? async_page_fault+0x1e/0x30 [ 60.891456] ? pte_clear.constprop.18+0x2e/0x2e [ 60.892144] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.892890] ? do_page_fault+0x85/0xf0 [ 60.893466] ? async_page_fault+0x1e/0x30 [ 60.894040] ? pte_clear.constprop.18+0x2e/0x2e [ 60.894646] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.895288] ? acpi_ns_lookup+0x294/0x3b2 [ 60.895834] ? do_page_fault+0x85/0xf0 [ 60.896355] ? async_page_fault+0x1e/0x30 [ 60.896940] ? pte_clear.constprop.18+0x2e/0x2e [ 60.897615] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.898332] ? __update_load_avg_se.isra.39+0x1cf/0x1e0 [ 60.899088] ? do_page_fault+0x85/0xf0 [ 60.899668] ? async_page_fault+0x1e/0x30 [ 60.900282] ? pte_clear.constprop.18+0x2e/0x2e [ 60.900958] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.901673] ? do_page_fault+0x85/0xf0 [ 60.902255] ? async_page_fault+0x1e/0x30 [ 60.902867] ? pte_clear.constprop.18+0x2e/0x2e [ 60.903539] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.904255] ? do_page_fault+0x85/0xf0 [ 60.904839] ? async_page_fault+0x1e/0x30 [ 60.905466] ? pte_clear.constprop.18+0x2e/0x2e [ 60.906212] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.906932] ? do_select+0x6a6/0x7b0 [ 60.907492] ? do_page_fault+0x85/0xf0 [ 60.908076] ? async_page_fault+0x1e/0x30 [ 60.908706] ? pte_clear.constprop.18+0x2e/0x2e [ 60.909452] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.910213] ? do_page_fault+0x85/0xf0 [ 60.910794] ? async_page_fault+0x1e/0x30 [ 60.911404] ? pte_clear.constprop.18+0x2e/0x2e [ 60.912081] ? perf_trace_x86_exceptions+0x44/0x100 [ 60.912797] ? do_page_fault+0x85/0xf0 [ 60.913371] ? async_page_fault+0x1e/0x30 [ 60.913970] ? copy_user_enhanced_fast_string+0xe/0x20 [ 60.914709] ? find_get_entry+0x19/0xc0 [ 60.915291] ? copyout+0x22/0x30 [ 60.915794] ? copy_page_to_iter+0x10c/0x2f0 [ 60.916432] ? generic_file_read_iter+0x44a/0x9c0 [ 60.917132] ? do_mmap+0x3c9/0x5e0 [ 60.917670] ? __vfs_read+0x100/0x170 [ 60.918234] ? vfs_read+0x89/0x130 [ 60.918770] ? ksys_read+0x52/0xc0 [ 60.919308] ? do_syscall_64+0x55/0xf0 [ 60.919885] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 60.920673] Code: 48 0f b3 1c 25 da 10 02 00 eb 05 49 0f ba ee 3f 41 0f 22 de e9 eb f7 ff ff fc 56 48 8b 74 24 08 48 89 7c 24 08 52 31 d2 51 31 c9 <50> 41 50 45 31 c0 41 51 45 31 c9 41 52 45 31 d2 41 53 45 31 db [ 60.923194] RIP: error_entry+0x12/0x100 RSP: ffffb050000d0000 [ 60.924008] ---[ end trace 8a1ab620615a934d ]--- [ 60.924693] Kernel panic - not syncing: Fatal exception [ 60.925556] Kernel Offset: 0x34400000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
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