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On failed task initialization due to memory allocation failures, we can call into destroy_context() with process_tb entry already populated. This patch forces the process_tb entry to zero in destroy_context(). With this patch, we lose the ability to track if we are destroying a context without flushing the process table entry. WARNING: CPU: 4 PID: 6368 at arch/powerpc/mm/mmu_context_book3s64.c:246 destroy_context+0x58/0x340 NIP [c0000000000875f8] destroy_context+0x58/0x340 LR [c00000000013da18] __mmdrop+0x78/0x270 Call Trace: [c000000f7db77c80] [c00000000013da18] __mmdrop+0x78/0x270 [c000000f7db77cf0] [c0000000004d6a34] __do_execve_file.isra.13+0xbd4/0x1000 [c000000f7db77e00] [c0000000004d7428] sys_execve+0x58/0x70 [c000000f7db77e30] [c00000000000b388] system_call+0x5c/0x70 Reported-by: Priya M.A <priyama2@in.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> [mpe: Reformat/tweak comment wording] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190918140103.24395-1-aneesh.kumar@linux.ibm.com |
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| .. | ||
| book3s32 | ||
| book3s64 | ||
| kasan | ||
| nohash | ||
| ptdump | ||
| copro_fault.c | ||
| dma-noncoherent.c | ||
| drmem.c | ||
| fault.c | ||
| highmem.c | ||
| hugetlbpage.c | ||
| init_32.c | ||
| init_64.c | ||
| init-common.c | ||
| ioremap_32.c | ||
| ioremap_64.c | ||
| ioremap.c | ||
| Makefile | ||
| mem.c | ||
| mmap.c | ||
| mmu_context.c | ||
| mmu_decl.h | ||
| numa.c | ||
| pgtable_32.c | ||
| pgtable_64.c | ||
| pgtable-frag.c | ||
| pgtable.c | ||
| slice.c | ||