On Fri, 17 May 2024 15:02:28 +0200 Andrey Konovalov <andreyknvl@xxxxxxxxx> wrote: > +Nico, who also encountered this issue. > > Mailed a patch that should fix this: > https://lore.kernel.org/linux-mm/20240517130118.759301-1-andrey.konovalov@xxxxxxxxx/T/#u > > You can consider disabling CONFIG_FORTIFY_SOURCE for now as a workaround. > > Thank you! The patch fixes the issue on ppc too. Thanks! The test run continues and I get a failing one later on (though not '31 rcu_uaf' Nico reported but) '65 vmalloc_oob': [...] BUG: KASAN: vmalloc-out-of-bounds in vmalloc_oob+0x1d0/0x3cc Read of size 1 at addr f10457f3 by task kunit_try_catch/190 CPU: 0 PID: 190 Comm: kunit_try_catch Tainted: G B N 6.9.1-PMacG4-dirty #1 Hardware name: PowerMac3,1 7450 0x80000201 PowerMac Call Trace: [f197bd60] [c15f48ac] dump_stack_lvl+0x80/0xac (unreliable) [f197bd80] [c04c3f14] print_report+0xd4/0x4fc [f197bdd0] [c04c456c] kasan_report+0xf8/0x10c [f197be50] [c04c723c] vmalloc_oob+0x1d0/0x3cc [f197bed0] [c0c29e98] kunit_try_run_case+0x3bc/0x5d8 [f197bfa0] [c0c2f1c8] kunit_generic_run_threadfn_adapter+0xa4/0xf8 [f197bfc0] [c00facf8] kthread+0x384/0x394 [f197bff0] [c002e304] start_kernel_thread+0x10/0x14 The buggy address belongs to the virtual mapping at [f1045000, f1047000) created by: vmalloc_oob+0x70/0x3cc The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:00000000 index:0x0 pfn:0x79f8b flags: 0x80000000(zone=2) page_type: 0xffffffff() raw: 80000000 00000000 00000122 00000000 00000000 00000000 ffffffff 00000001 raw: 00000000 page dumped because: kasan: bad access detected Memory state around the buggy address: f1045680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1045700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >f1045780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 f8 ^ f1045800: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f1045880: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ================================================================== ================================================================== BUG: KASAN: vmalloc-out-of-bounds in vmalloc_oob+0x294/0x3cc Read of size 1 at addr f10457f8 by task kunit_try_catch/190 CPU: 0 PID: 190 Comm: kunit_try_catch Tainted: G B N 6.9.1-PMacG4-dirty #1 Hardware name: PowerMac3,1 7450 0x80000201 PowerMac Call Trace: [f197bd60] [c15f48ac] dump_stack_lvl+0x80/0xac (unreliable) [f197bd80] [c04c3f14] print_report+0xd4/0x4fc [f197bdd0] [c04c456c] kasan_report+0xf8/0x10c [f197be50] [c04c7300] vmalloc_oob+0x294/0x3cc [f197bed0] [c0c29e98] kunit_try_run_case+0x3bc/0x5d8 [f197bfa0] [c0c2f1c8] kunit_generic_run_threadfn_adapter+0xa4/0xf8 [f197bfc0] [c00facf8] kthread+0x384/0x394 [f197bff0] [c002e304] start_kernel_thread+0x10/0x14 The buggy address belongs to the virtual mapping at [f1045000, f1047000) created by: vmalloc_oob+0x70/0x3cc The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:00000000 index:0x0 pfn:0x79f8b flags: 0x80000000(zone=2) page_type: 0xffffffff() raw: 80000000 00000000 00000122 00000000 00000000 00000000 ffffffff 00000001 raw: 00000000 page dumped because: kasan: bad access detected Memory state around the buggy address: f1045680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1045700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >f1045780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 f8 ^ f1045800: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f1045880: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ================================================================== # vmalloc_oob: ASSERTION FAILED at mm/kasan/kasan_test.c:1680 Expected p_ptr is not null, but is not ok 65 vmalloc_oob [...] This is in line with my CLANG 18 build where I get the same vmalloc_oob failure: https://github.com/ClangBuiltLinux/linux/issues/2020. There Nathan already found out this happens when the machine got more than 867 MB of RAM. Probably this test failing may be a ppc specific issue. I can also open a new thread for that if you'd like. I run my attached .config kernel build on qemu via: qemu-system-ppc -machine mac99,via=pmu -cpu 7450 -m 2G -nographic -append console=ttyS0 -kernel /var/cache/distfiles/vmlinux-6.9.1-PMacG4-dirty -hda Debian-VM_g4.img Regards, Erhard
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