From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it1-f198.google.com (mail-it1-f198.google.com [209.85.166.198]) by kanga.kvack.org (Postfix) with ESMTP id A83818E005B for ; Mon, 31 Dec 2018 02:51:05 -0500 (EST) Received: by mail-it1-f198.google.com with SMTP id 135so31341245itk.5 for ; Sun, 30 Dec 2018 23:51:05 -0800 (PST) Received: from mail-sor-f69.google.com (mail-sor-f69.google.com. [209.85.220.69]) by mx.google.com with SMTPS id l25sor17014576ioj.101.2018.12.30.23.51.04 for (Google Transport Security); Sun, 30 Dec 2018 23:51:04 -0800 (PST) MIME-Version: 1.0 Date: Sun, 30 Dec 2018 23:51:04 -0800 Message-ID: <000000000000c06550057e4cac7c@google.com> Subject: KMSAN: uninit-value in mpol_rebind_mm From: syzbot Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: owner-linux-mm@kvack.org List-ID: To: aarcange@redhat.com, akpm@linux-foundation.org, glider@google.com, kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux@dominikbrodowski.net, mhocko@suse.com, rientjes@google.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz, xieyisheng1@huawei.com, zhongjiang@huawei.com Hello, syzbot found the following crash on: HEAD commit: 79fc24ff6184 kmsan: highmem: use kmsan_clear_page() in cop.. git tree: kmsan console output: https://syzkaller.appspot.com/x/log.txt?x=13c48b67400000 kernel config: https://syzkaller.appspot.com/x/.config?x=901dd030b2cc57e7 dashboard link: https://syzkaller.appspot.com/bug?extid=b19c2dc2c990ea657a71 compiler: clang version 8.0.0 (trunk 349734) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+b19c2dc2c990ea657a71@syzkaller.appspotmail.com ================================================================== BUG: KMSAN: uninit-value in mpol_rebind_policy mm/mempolicy.c:353 [inline] BUG: KMSAN: uninit-value in mpol_rebind_mm+0x249/0x370 mm/mempolicy.c:384 CPU: 1 PID: 17420 Comm: syz-executor4 Not tainted 4.20.0-rc7+ #15 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x173/0x1d0 lib/dump_stack.c:113 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:613 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:295 mpol_rebind_policy mm/mempolicy.c:353 [inline] mpol_rebind_mm+0x249/0x370 mm/mempolicy.c:384 update_tasks_nodemask+0x608/0xca0 kernel/cgroup/cpuset.c:1120 update_nodemasks_hier kernel/cgroup/cpuset.c:1185 [inline] update_nodemask kernel/cgroup/cpuset.c:1253 [inline] cpuset_write_resmask+0x2a98/0x34b0 kernel/cgroup/cpuset.c:1728 cgroup_file_write+0x44a/0x8e0 kernel/cgroup/cgroup.c:3473 kernfs_fop_write+0x558/0x840 fs/kernfs/file.c:316 __vfs_write+0x1f4/0xb70 fs/read_write.c:485 __kernel_write+0x1fb/0x590 fs/read_write.c:506 write_pipe_buf+0x1c0/0x270 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x48c/0xf10 fs/splice.c:627 splice_from_pipe fs/splice.c:662 [inline] default_file_splice_write+0x1ee/0x3c0 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x19e/0x200 fs/splice.c:1023 splice_direct_to_actor+0x852/0x1140 fs/splice.c:978 do_splice_direct+0x342/0x580 fs/splice.c:1066 do_sendfile+0x108f/0x1de0 fs/read_write.c:1439 __do_sys_sendfile64 fs/read_write.c:1494 [inline] __se_sys_sendfile64+0x189/0x360 fs/read_write.c:1486 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1486 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x4579b9 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f132b74cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004579b9 RDX: 0000000020000080 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 00007f132b74d6d4 R13: 00000000004c471e R14: 00000000004d7d10 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:204 [inline] kmsan_save_stack mm/kmsan/kmsan.c:219 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:439 kmsan_memcpy_memmove_metadata+0x58f/0xfa0 mm/kmsan/kmsan.c:316 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:337 __msan_memcpy+0x5b/0x70 mm/kmsan/kmsan_instr.c:133 __mpol_dup+0x146/0x470 mm/mempolicy.c:2149 mpol_dup include/linux/mempolicy.h:91 [inline] vma_dup_policy+0x93/0x190 mm/mempolicy.c:2116 dup_mmap kernel/fork.c:529 [inline] dup_mm kernel/fork.c:1320 [inline] copy_mm kernel/fork.c:1375 [inline] copy_process+0x65e6/0xb020 kernel/fork.c:1919 _do_fork+0x384/0x1050 kernel/fork.c:2218 __do_sys_clone kernel/fork.c:2325 [inline] __se_sys_clone+0xf6/0x110 kernel/fork.c:2319 __x64_sys_clone+0x62/0x80 kernel/fork.c:2319 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:204 [inline] kmsan_save_stack mm/kmsan/kmsan.c:219 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:439 kmsan_memcpy_memmove_metadata+0x58f/0xfa0 mm/kmsan/kmsan.c:316 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:337 __msan_memcpy+0x5b/0x70 mm/kmsan/kmsan_instr.c:133 __mpol_dup+0x146/0x470 mm/mempolicy.c:2149 mpol_dup include/linux/mempolicy.h:91 [inline] vma_replace_policy mm/mempolicy.c:656 [inline] mbind_range mm/mempolicy.c:728 [inline] do_mbind mm/mempolicy.c:1223 [inline] kernel_mbind+0x254d/0x31a0 mm/mempolicy.c:1347 __do_sys_mbind mm/mempolicy.c:1354 [inline] __se_sys_mbind+0x11c/0x130 mm/mempolicy.c:1350 __x64_sys_mbind+0x6e/0x90 mm/mempolicy.c:1350 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:204 [inline] kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:158 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176 kmem_cache_alloc+0x572/0xb90 mm/slub.c:2777 mpol_new mm/mempolicy.c:276 [inline] do_mbind mm/mempolicy.c:1180 [inline] kernel_mbind+0x8a7/0x31a0 mm/mempolicy.c:1347 __do_sys_mbind mm/mempolicy.c:1354 [inline] __se_sys_mbind+0x11c/0x130 mm/mempolicy.c:1350 __x64_sys_mbind+0x6e/0x90 mm/mempolicy.c:1350 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. 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[209.85.220.69]) by mx.google.com with SMTPS id l25sor17014576ioj.101.2018.12.30.23.51.04 for (Google Transport Security); Sun, 30 Dec 2018 23:51:04 -0800 (PST) Received-SPF: pass (google.com: domain of 3amopxakbais7dezp00t6p44xs.v33v0t97t6r328t28.r31@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) client-ip=209.85.220.69; Authentication-Results: mx.google.com; spf=pass (google.com: domain of 3amopxakbais7dezp00t6p44xs.v33v0t97t6r328t28.r31@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=3aMopXAkbAIs7DEzp00t6p44xs.v33v0t97t6r328t28.r31@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Google-Smtp-Source: ALg8bN7UvxTW/tVd0ZZBjdqQL1056zg74TXcTo/Inyc5KBwM/qzF+bO909d/IEUkSdgV7NKNgByMpHoI+QyjyzO+pdXjTBrrCDpp MIME-Version: 1.0 X-Received: by 2002:a5d:8d81:: with SMTP id b1mr34927650ioj.27.1546242664454; Sun, 30 Dec 2018 23:51:04 -0800 (PST) Date: Sun, 30 Dec 2018 23:51:04 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c06550057e4cac7c@google.com> Subject: KMSAN: uninit-value in mpol_rebind_mm From: syzbot To: aarcange@redhat.com, akpm@linux-foundation.org, glider@google.com, kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux@dominikbrodowski.net, mhocko@suse.com, rientjes@google.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz, xieyisheng1@huawei.com, zhongjiang@huawei.com Content-Type: text/plain; charset="UTF-8"; delsp="yes"; format="flowed" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Message-ID: <20181231075104.Eg5oOgoy8pdo-6GfWnothmJYEt_f54JaP3Q3klIryo0@z> Hello, syzbot found the following crash on: HEAD commit: 79fc24ff6184 kmsan: highmem: use kmsan_clear_page() in cop.. git tree: kmsan console output: https://syzkaller.appspot.com/x/log.txt?x=13c48b67400000 kernel config: https://syzkaller.appspot.com/x/.config?x=901dd030b2cc57e7 dashboard link: https://syzkaller.appspot.com/bug?extid=b19c2dc2c990ea657a71 compiler: clang version 8.0.0 (trunk 349734) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+b19c2dc2c990ea657a71@syzkaller.appspotmail.com ================================================================== BUG: KMSAN: uninit-value in mpol_rebind_policy mm/mempolicy.c:353 [inline] BUG: KMSAN: uninit-value in mpol_rebind_mm+0x249/0x370 mm/mempolicy.c:384 CPU: 1 PID: 17420 Comm: syz-executor4 Not tainted 4.20.0-rc7+ #15 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x173/0x1d0 lib/dump_stack.c:113 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:613 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:295 mpol_rebind_policy mm/mempolicy.c:353 [inline] mpol_rebind_mm+0x249/0x370 mm/mempolicy.c:384 update_tasks_nodemask+0x608/0xca0 kernel/cgroup/cpuset.c:1120 update_nodemasks_hier kernel/cgroup/cpuset.c:1185 [inline] update_nodemask kernel/cgroup/cpuset.c:1253 [inline] cpuset_write_resmask+0x2a98/0x34b0 kernel/cgroup/cpuset.c:1728 cgroup_file_write+0x44a/0x8e0 kernel/cgroup/cgroup.c:3473 kernfs_fop_write+0x558/0x840 fs/kernfs/file.c:316 __vfs_write+0x1f4/0xb70 fs/read_write.c:485 __kernel_write+0x1fb/0x590 fs/read_write.c:506 write_pipe_buf+0x1c0/0x270 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x48c/0xf10 fs/splice.c:627 splice_from_pipe fs/splice.c:662 [inline] default_file_splice_write+0x1ee/0x3c0 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x19e/0x200 fs/splice.c:1023 splice_direct_to_actor+0x852/0x1140 fs/splice.c:978 do_splice_direct+0x342/0x580 fs/splice.c:1066 do_sendfile+0x108f/0x1de0 fs/read_write.c:1439 __do_sys_sendfile64 fs/read_write.c:1494 [inline] __se_sys_sendfile64+0x189/0x360 fs/read_write.c:1486 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1486 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x4579b9 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f132b74cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004579b9 RDX: 0000000020000080 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 00007f132b74d6d4 R13: 00000000004c471e R14: 00000000004d7d10 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:204 [inline] kmsan_save_stack mm/kmsan/kmsan.c:219 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:439 kmsan_memcpy_memmove_metadata+0x58f/0xfa0 mm/kmsan/kmsan.c:316 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:337 __msan_memcpy+0x5b/0x70 mm/kmsan/kmsan_instr.c:133 __mpol_dup+0x146/0x470 mm/mempolicy.c:2149 mpol_dup include/linux/mempolicy.h:91 [inline] vma_dup_policy+0x93/0x190 mm/mempolicy.c:2116 dup_mmap kernel/fork.c:529 [inline] dup_mm kernel/fork.c:1320 [inline] copy_mm kernel/fork.c:1375 [inline] copy_process+0x65e6/0xb020 kernel/fork.c:1919 _do_fork+0x384/0x1050 kernel/fork.c:2218 __do_sys_clone kernel/fork.c:2325 [inline] __se_sys_clone+0xf6/0x110 kernel/fork.c:2319 __x64_sys_clone+0x62/0x80 kernel/fork.c:2319 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:204 [inline] kmsan_save_stack mm/kmsan/kmsan.c:219 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:439 kmsan_memcpy_memmove_metadata+0x58f/0xfa0 mm/kmsan/kmsan.c:316 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:337 __msan_memcpy+0x5b/0x70 mm/kmsan/kmsan_instr.c:133 __mpol_dup+0x146/0x470 mm/mempolicy.c:2149 mpol_dup include/linux/mempolicy.h:91 [inline] vma_replace_policy mm/mempolicy.c:656 [inline] mbind_range mm/mempolicy.c:728 [inline] do_mbind mm/mempolicy.c:1223 [inline] kernel_mbind+0x254d/0x31a0 mm/mempolicy.c:1347 __do_sys_mbind mm/mempolicy.c:1354 [inline] __se_sys_mbind+0x11c/0x130 mm/mempolicy.c:1350 __x64_sys_mbind+0x6e/0x90 mm/mempolicy.c:1350 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:204 [inline] kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:158 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176 kmem_cache_alloc+0x572/0xb90 mm/slub.c:2777 mpol_new mm/mempolicy.c:276 [inline] do_mbind mm/mempolicy.c:1180 [inline] kernel_mbind+0x8a7/0x31a0 mm/mempolicy.c:1347 __do_sys_mbind mm/mempolicy.c:1354 [inline] __se_sys_mbind+0x11c/0x130 mm/mempolicy.c:1350 __x64_sys_mbind+0x6e/0x90 mm/mempolicy.c:1350 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 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