Messages in this thread | | | Date | Sat, 24 Sep 2016 13:45:33 +0900 | From | Seung-Woo Kim <> | Subject | UBSAN: Undefined behaviour in ./arch/arm/include/asm/bitops.h |
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With the patch "arm: ubsan: select ARCH_HAS_UBSAN_SANITIZE_ALL", I got following UBSAN warning on Exynos5422 SoC board.
================================================================================ UBSAN: Undefined behaviour in ./arch/arm/include/asm/bitops.h:296:17 negation of -2147483648 cannot be represented in type 'int': CPU: 2 PID: 5637 Comm: fsck.ext4 Tainted: G W 4.8.0-rc7-00173-g142932f #25 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [<c0119e28>] (unwind_backtrace) from [<c01123dc>] (show_stack+0x20/0x24) [<c01123dc>] (show_stack) from [<c0617f70>] (dump_stack+0x84/0xa0) [<c0617f70>] (dump_stack) from [<c0672ba0>] (ubsan_epilogue+0x14/0x50) [<c0672ba0>] (ubsan_epilogue) from [<c067335c>] (__ubsan_handle_negate_overflow+0x68/0x6c) [<c067335c>] (__ubsan_handle_negate_overflow) from [<c0621044>] (radix_tree_next_chunk+0x4e8/0x5ac) [<c0621044>] (radix_tree_next_chunk) from [<c0286abc>] (find_get_pages_tag+0x1b0/0x390) [<c0286abc>] (find_get_pages_tag) from [<c02a6154>] (pagevec_lookup_tag+0x38/0x68) [<c02a6154>] (pagevec_lookup_tag) from [<c029e818>] (write_cache_pages+0x134/0x85c) [<c029e818>] (write_cache_pages) from [<c029ef9c>] (generic_writepages+0x5c/0x9c) [<c029ef9c>] (generic_writepages) from [<c038eae8>] (blkdev_writepages+0x18/0x1c) [<c038eae8>] (blkdev_writepages) from [<c02a2054>] (do_writepages+0x58/0xa4) [<c02a2054>] (do_writepages) from [<c0289abc>] (__filemap_fdatawrite_range+0xac/0x10c) [<c0289abc>] (__filemap_fdatawrite_range) from [<c0289cc8>] (filemap_write_and_wait_range+0x54/0xb8) [<c0289cc8>] (filemap_write_and_wait_range) from [<c038f75c>] (blkdev_fsync+0x40/0xa4) [<c038f75c>] (blkdev_fsync) from [<c0381bf0>] (vfs_fsync_range+0x70/0x160) [<c0381bf0>] (vfs_fsync_range) from [<c0381d68>] (do_fsync+0x4c/0x74) [<c0381d68>] (do_fsync) from [<c038224c>] (SyS_fsync+0x1c/0x20) [<c038224c>] (SyS_fsync) from [<c010bd20>] (ret_fast_syscall+0x0/0x3c) ================================================================================
================================================================================ UBSAN: Undefined behaviour in ./arch/arm/include/asm/bitops.h:296:17 negation of -2147483648 cannot be represented in type 'int': CPU: 3 PID: 6313 Comm: enlightenment Tainted: G W 4.8.0-rc7-00173-g142932f #25 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [<c0119e28>] (unwind_backtrace) from [<c01123dc>] (show_stack+0x20/0x24) [<c01123dc>] (show_stack) from [<c0617f10>] (dump_stack+0x84/0xa0) [<c0617f10>] (dump_stack) from [<c0672b40>] (ubsan_epilogue+0x14/0x50) [<c0672b40>] (ubsan_epilogue) from [<c06732fc>] (__ubsan_handle_negate_overflow+0x68/0x6c) [<c06732fc>] (__ubsan_handle_negate_overflow) from [<c0147f54>] (next_signal+0x114/0x16c) [<c0147f54>] (next_signal) from [<c0147fdc>] (dequeue_signal+0x30/0x30c) [<c0147fdc>] (dequeue_signal) from [<c014cb58>] (get_signal+0x120/0xe84) [<c014cb58>] (get_signal) from [<c01114fc>] (do_signal+0x37c/0x550) [<c01114fc>] (do_signal) from [<c01119b8>] (do_work_pending+0xd0/0x134) [<c01119b8>] (do_work_pending) from [<c010bd74>] (slow_work_pending+0xc/0x20) ================================================================================
Regards, - Seung-Woo Kim
-- Seung-Woo Kim Samsung Software R&D Center --
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