Messages in this thread | | | Date | Thu, 24 Oct 2019 09:07:08 -0700 | Subject | KCSAN: data-race in __rb_rotate_set_parents / vm_area_dup | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 05f22368 x86, kcsan: Enable KCSAN for x86 git tree: https://github.com/google/ktsan.git kcsan console output: https://syzkaller.appspot.com/x/log.txt?x=1060c47b600000 kernel config: https://syzkaller.appspot.com/x/.config?x=87d111955f40591f dashboard link: https://syzkaller.appspot.com/bug?extid=c034966b0b02f94f7f34 compiler: gcc (GCC) 9.0.0 20181231 (experimental)
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+c034966b0b02f94f7f34@syzkaller.appspotmail.com
================================================================== BUG: KCSAN: data-race in __rb_rotate_set_parents / vm_area_dup
read to 0xffff88811eef53e8 of 200 bytes by task 7738 on cpu 0: vm_area_dup+0x70/0xf0 kernel/fork.c:359 __split_vma+0x88/0x350 mm/mmap.c:2678 __do_munmap+0xb02/0xb60 mm/mmap.c:2803 do_munmap mm/mmap.c:2856 [inline] mmap_region+0x165/0xd50 mm/mmap.c:1749 do_mmap+0x6d4/0xba0 mm/mmap.c:1577 do_mmap_pgoff include/linux/mm.h:2353 [inline] vm_mmap_pgoff+0x12d/0x190 mm/util.c:496 ksys_mmap_pgoff+0x2d8/0x420 mm/mmap.c:1629 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0x91/0xc0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9
write to 0xffff88811eef5440 of 8 bytes by task 7737 on cpu 1: __rb_rotate_set_parents+0x4d/0xf0 lib/rbtree.c:79 __rb_insert lib/rbtree.c:215 [inline] __rb_insert_augmented+0x109/0x370 lib/rbtree.c:459 rb_insert_augmented include/linux/rbtree_augmented.h:50 [inline] rb_insert_augmented_cached include/linux/rbtree_augmented.h:60 [inline] vma_interval_tree_insert+0x196/0x230 mm/interval_tree.c:23 __vma_link_file+0xd9/0x110 mm/mmap.c:634 __vma_adjust+0x1ac/0x12a0 mm/mmap.c:842 vma_adjust include/linux/mm.h:2276 [inline] __split_vma+0x208/0x350 mm/mmap.c:2707 split_vma+0x73/0xa0 mm/mmap.c:2736 mprotect_fixup+0x43f/0x510 mm/mprotect.c:413 do_mprotect_pkey+0x3eb/0x660 mm/mprotect.c:553 __do_sys_mprotect mm/mprotect.c:578 [inline] __se_sys_mprotect mm/mprotect.c:575 [inline] __x64_sys_mprotect+0x51/0x70 mm/mprotect.c:575 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9
Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7737 Comm: blkid Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================
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