tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 048ccca8c1c8f583deec3367d7df521bb1f542ae commit: c6d308534aef6c99904bf5862066360ae067abc4 UBSAN: run-time undefined behavior sanity checker date: 3 days ago config: i386-randconfig-s0-01241136 (attached as .config) reproduce: git checkout c6d308534aef6c99904bf5862066360ae067abc4 # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): In file included from arch/x86/include/asm/xor_32.h:544:0, from arch/x86/include/asm/xor.h:491, from crypto/xor.c:25: include/asm-generic/xor.h: In function 'xor_32regs_p_5': >> include/asm-generic/xor.h:678:1: warning: the frame size of 1604 bytes is larger than 1024 bytes [-Wframe-larger-than=] } ^ include/asm-generic/xor.h: In function 'xor_32regs_p_4': include/asm-generic/xor.h:599:1: warning: the frame size of 1340 bytes is larger than 1024 bytes [-Wframe-larger-than=] } ^ include/asm-generic/xor.h: In function 'xor_32regs_p_3': include/asm-generic/xor.h:531:1: warning: the frame size of 1068 bytes is larger than 1024 bytes [-Wframe-larger-than=] } ^ include/asm-generic/xor.h: In function 'xor_8regs_p_5': include/asm-generic/xor.h:429:1: warning: the frame size of 1604 bytes is larger than 1024 bytes [-Wframe-larger-than=] } ^ include/asm-generic/xor.h: In function 'xor_8regs_p_4': include/asm-generic/xor.h:392:1: warning: the frame size of 1340 bytes is larger than 1024 bytes [-Wframe-larger-than=] } ^ include/asm-generic/xor.h: In function 'xor_8regs_p_3': include/asm-generic/xor.h:358:1: warning: the frame size of 1068 bytes is larger than 1024 bytes [-Wframe-larger-than=] } ^ -- In file included from include/linux/blkdev.h:4:0, from drivers/md/dm-bufio.h:12, from drivers/md/dm-bufio.c:9: drivers/md/dm-bufio.c: In function 'alloc_buffer': >> include/linux/sched.h:2157:56: warning: 'noio_flag' may be used uninitialized in this function [-Wmaybe-uninitialized] current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags; ^ drivers/md/dm-bufio.c:389:11: note: 'noio_flag' was declared here unsigned noio_flag; ^ vim +/noio_flag +2157 include/linux/sched.h 21caf2fc Ming Lei 2013-02-22 2141 static inline gfp_t memalloc_noio_flags(gfp_t flags) 21caf2fc Ming Lei 2013-02-22 2142 { 21caf2fc Ming Lei 2013-02-22 2143 if (unlikely(current->flags & PF_MEMALLOC_NOIO)) 934f3072 Junxiao Bi 2014-10-09 2144 flags &= ~(__GFP_IO | __GFP_FS); 21caf2fc Ming Lei 2013-02-22 2145 return flags; 21caf2fc Ming Lei 2013-02-22 2146 } 21caf2fc Ming Lei 2013-02-22 2147 21caf2fc Ming Lei 2013-02-22 2148 static inline unsigned int memalloc_noio_save(void) 21caf2fc Ming Lei 2013-02-22 2149 { 21caf2fc Ming Lei 2013-02-22 2150 unsigned int flags = current->flags & PF_MEMALLOC_NOIO; 21caf2fc Ming Lei 2013-02-22 2151 current->flags |= PF_MEMALLOC_NOIO; 21caf2fc Ming Lei 2013-02-22 2152 return flags; 21caf2fc Ming Lei 2013-02-22 2153 } 21caf2fc Ming Lei 2013-02-22 2154 21caf2fc Ming Lei 2013-02-22 2155 static inline void memalloc_noio_restore(unsigned int flags) 21caf2fc Ming Lei 2013-02-22 2156 { 21caf2fc Ming Lei 2013-02-22 @2157 current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags; 21caf2fc Ming Lei 2013-02-22 2158 } 21caf2fc Ming Lei 2013-02-22 2159 1d4457f9 Kees Cook 2014-05-21 2160 /* Per-process atomic flags. */ a2b86f77 Zefan Li 2014-09-25 2161 #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ 2ad654bc Zefan Li 2014-09-25 2162 #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ 2ad654bc Zefan Li 2014-09-25 2163 #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ 2ad654bc Zefan Li 2014-09-25 2164 1d4457f9 Kees Cook 2014-05-21 2165 :::::: The code at line 2157 was first introduced by commit :::::: 21caf2fc1931b485483ddd254b634fa8f0099963 mm: teach mm by current context info to not do I/O during memory allocation :::::: TO: Ming Lei <ming.lei@xxxxxxxxxxxxx> :::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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