linux-kernel - Re: [syzbot] memory leak in xas

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Message-Id: <20220529163935.5118b4f91e2c5c3378ab326f@linux-foundation.org>
Date:   Sun, 29 May 2022 16:39:35 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     syzbot <syzbot+9e27a75a8c24f3fe75c1@...kaller.appspotmail.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [syzbot] memory leak in xas_nomem

On Fri, 27 May 2022 20:20:21 -0700 syzbot <syzbot+9e27a75a8c24f3fe75c1@...kaller.appspotmail.com> wrote:

> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    1e57930e9f40 Merge tag 'rcu.2022.05.19a' of git://git.kern..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17afc423f00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=5757003cb23a31a7
> dashboard link: https://syzkaller.appspot.com/bug?extid=9e27a75a8c24f3fe75c1
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16bc056ef00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=116b7d9df00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+9e27a75a8c24f3fe75c1@...kaller.appspotmail.com
> 
> BUG: memory leak

(hopefully cc's willy)

> unreferenced object 0xffff88810cb35d80 (size 576):
>   comm "syz-executor883", pid 3623, jiffies 4294954631 (age 23.510s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     18 48 36 04 81 88 ff ff 98 5d b3 0c 81 88 ff ff  .H6......]......
>   backtrace:
>     [<ffffffff8247dfba>] xas_nomem lib/xarray.c:307 [inline]
>     [<ffffffff8247dfba>] xas_nomem+0x4a/0xd0 lib/xarray.c:299
>     [<ffffffff8157b8d0>] split_huge_page_to_list+0x26d0/0x29f0 mm/huge_memory.c:2626
>     [<ffffffff8148a224>] split_huge_page include/linux/huge_mm.h:191 [inline]
>     [<ffffffff8148a224>] truncate_inode_partial_folio+0x3e4/0x5f0 mm/truncate.c:243
>     [<ffffffff814a78a0>] shmem_undo_range+0x3d0/0xbe0 mm/shmem.c:966
>     [<ffffffff814a8e51>] shmem_truncate_range mm/shmem.c:1044 [inline]
>     [<ffffffff814a8e51>] shmem_fallocate+0x1e1/0x910 mm/shmem.c:2671
>     [<ffffffff815b5c6c>] vfs_fallocate+0x31c/0x670 fs/open.c:308
>     [<ffffffff815237e3>] madvise_remove mm/madvise.c:965 [inline]
>     [<ffffffff815237e3>] madvise_vma_behavior+0x7d3/0x1000 mm/madvise.c:989
>     [<ffffffff8151f2fc>] madvise_walk_vmas+0x11c/0x1d0 mm/madvise.c:1221
>     [<ffffffff8152437b>] do_madvise mm/madvise.c:1399 [inline]
>     [<ffffffff8152437b>] do_madvise+0x23b/0x320 mm/madvise.c:1357
>     [<ffffffff8152478a>] __do_sys_madvise mm/madvise.c:1412 [inline]
>     [<ffffffff8152478a>] __se_sys_madvise mm/madvise.c:1410 [inline]
>     [<ffffffff8152478a>] __x64_sys_madvise+0x2a/0x30 mm/madvise.c:1410
>     [<ffffffff84565f15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84565f15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> BUG: memory leak
> unreferenced object 0xffff88810cb39d80 (size 576):
>   comm "syz-executor883", pid 3622, jiffies 4294954659 (age 23.230s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     98 f8 cd 0d 81 88 ff ff 98 9d b3 0c 81 88 ff ff  ................
>   backtrace:
>     [<ffffffff8247dfba>] xas_nomem lib/xarray.c:307 [inline]
>     [<ffffffff8247dfba>] xas_nomem+0x4a/0xd0 lib/xarray.c:299
>     [<ffffffff8157b8d0>] split_huge_page_to_list+0x26d0/0x29f0 mm/huge_memory.c:2626
>     [<ffffffff8148a224>] split_huge_page include/linux/huge_mm.h:191 [inline]
>     [<ffffffff8148a224>] truncate_inode_partial_folio+0x3e4/0x5f0 mm/truncate.c:243
>     [<ffffffff814a78a0>] shmem_undo_range+0x3d0/0xbe0 mm/shmem.c:966
>     [<ffffffff814a8e51>] shmem_truncate_range mm/shmem.c:1044 [inline]
>     [<ffffffff814a8e51>] shmem_fallocate+0x1e1/0x910 mm/shmem.c:2671
>     [<ffffffff815b5c6c>] vfs_fallocate+0x31c/0x670 fs/open.c:308
>     [<ffffffff815237e3>] madvise_remove mm/madvise.c:965 [inline]
>     [<ffffffff815237e3>] madvise_vma_behavior+0x7d3/0x1000 mm/madvise.c:989
>     [<ffffffff8151f2fc>] madvise_walk_vmas+0x11c/0x1d0 mm/madvise.c:1221
>     [<ffffffff8152437b>] do_madvise mm/madvise.c:1399 [inline]
>     [<ffffffff8152437b>] do_madvise+0x23b/0x320 mm/madvise.c:1357
>     [<ffffffff8152478a>] __do_sys_madvise mm/madvise.c:1412 [inline]
>     [<ffffffff8152478a>] __se_sys_madvise mm/madvise.c:1410 [inline]
>     [<ffffffff8152478a>] __x64_sys_madvise+0x2a/0x30 mm/madvise.c:1410
>     [<ffffffff84565f15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84565f15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> BUG: memory leak
> unreferenced object 0xffff88810cb35d80 (size 576):
>   comm "syz-executor883", pid 3623, jiffies 4294954631 (age 29.410s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     18 48 36 04 81 88 ff ff 98 5d b3 0c 81 88 ff ff  .H6......]......
>   backtrace:
>     [<ffffffff8247dfba>] xas_nomem lib/xarray.c:307 [inline]
>     [<ffffffff8247dfba>] xas_nomem+0x4a/0xd0 lib/xarray.c:299
>     [<ffffffff8157b8d0>] split_huge_page_to_list+0x26d0/0x29f0 mm/huge_memory.c:2626
>     [<ffffffff8148a224>] split_huge_page include/linux/huge_mm.h:191 [inline]
>     [<ffffffff8148a224>] truncate_inode_partial_folio+0x3e4/0x5f0 mm/truncate.c:243
>     [<ffffffff814a78a0>] shmem_undo_range+0x3d0/0xbe0 mm/shmem.c:966
>     [<ffffffff814a8e51>] shmem_truncate_range mm/shmem.c:1044 [inline]
>     [<ffffffff814a8e51>] shmem_fallocate+0x1e1/0x910 mm/shmem.c:2671
>     [<ffffffff815b5c6c>] vfs_fallocate+0x31c/0x670 fs/open.c:308
>     [<ffffffff815237e3>] madvise_remove mm/madvise.c:965 [inline]
>     [<ffffffff815237e3>] madvise_vma_behavior+0x7d3/0x1000 mm/madvise.c:989
>     [<ffffffff8151f2fc>] madvise_walk_vmas+0x11c/0x1d0 mm/madvise.c:1221
>     [<ffffffff8152437b>] do_madvise mm/madvise.c:1399 [inline]
>     [<ffffffff8152437b>] do_madvise+0x23b/0x320 mm/madvise.c:1357
>     [<ffffffff8152478a>] __do_sys_madvise mm/madvise.c:1412 [inline]
>     [<ffffffff8152478a>] __se_sys_madvise mm/madvise.c:1410 [inline]
>     [<ffffffff8152478a>] __x64_sys_madvise+0x2a/0x30 mm/madvise.c:1410
>     [<ffffffff84565f15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84565f15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> BUG: memory leak
> unreferenced object 0xffff88810cb39d80 (size 576):
>   comm "syz-executor883", pid 3622, jiffies 4294954659 (age 29.130s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     98 f8 cd 0d 81 88 ff ff 98 9d b3 0c 81 88 ff ff  ................
>   backtrace:
>     [<ffffffff8247dfba>] xas_nomem lib/xarray.c:307 [inline]
>     [<ffffffff8247dfba>] xas_nomem+0x4a/0xd0 lib/xarray.c:299
>     [<ffffffff8157b8d0>] split_huge_page_to_list+0x26d0/0x29f0 mm/huge_memory.c:2626
>     [<ffffffff8148a224>] split_huge_page include/linux/huge_mm.h:191 [inline]
>     [<ffffffff8148a224>] truncate_inode_partial_folio+0x3e4/0x5f0 mm/truncate.c:243
>     [<ffffffff814a78a0>] shmem_undo_range+0x3d0/0xbe0 mm/shmem.c:966
>     [<ffffffff814a8e51>] shmem_truncate_range mm/shmem.c:1044 [inline]
>     [<ffffffff814a8e51>] shmem_fallocate+0x1e1/0x910 mm/shmem.c:2671
>     [<ffffffff815b5c6c>] vfs_fallocate+0x31c/0x670 fs/open.c:308
>     [<ffffffff815237e3>] madvise_remove mm/madvise.c:965 [inline]
>     [<ffffffff815237e3>] madvise_vma_behavior+0x7d3/0x1000 mm/madvise.c:989
>     [<ffffffff8151f2fc>] madvise_walk_vmas+0x11c/0x1d0 mm/madvise.c:1221
>     [<ffffffff8152437b>] do_madvise mm/madvise.c:1399 [inline]
>     [<ffffffff8152437b>] do_madvise+0x23b/0x320 mm/madvise.c:1357
>     [<ffffffff8152478a>] __do_sys_madvise mm/madvise.c:1412 [inline]
>     [<ffffffff8152478a>] __se_sys_madvise mm/madvise.c:1410 [inline]
>     [<ffffffff8152478a>] __x64_sys_madvise+0x2a/0x30 mm/madvise.c:1410
>     [<ffffffff84565f15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84565f15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> BUG: memory leak
> unreferenced object 0xffff88810cb35d80 (size 576):
>   comm "syz-executor883", pid 3623, jiffies 4294954631 (age 29.450s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     18 48 36 04 81 88 ff ff 98 5d b3 0c 81 88 ff ff  .H6......]......
>   backtrace:
>     [<ffffffff8247dfba>] xas_nomem lib/xarray.c:307 [inline]
>     [<ffffffff8247dfba>] xas_nomem+0x4a/0xd0 lib/xarray.c:299
>     [<ffffffff8157b8d0>] split_huge_page_to_list+0x26d0/0x29f0 mm/huge_memory.c:2626
>     [<ffffffff8148a224>] split_huge_page include/linux/huge_mm.h:191 [inline]
>     [<ffffffff8148a224>] truncate_inode_partial_folio+0x3e4/0x5f0 mm/truncate.c:243
>     [<ffffffff814a78a0>] shmem_undo_range+0x3d0/0xbe0 mm/shmem.c:966
>     [<ffffffff814a8e51>] shmem_truncate_range mm/shmem.c:1044 [inline]
>     [<ffffffff814a8e51>] shmem_fallocate+0x1e1/0x910 mm/shmem.c:2671
>     [<ffffffff815b5c6c>] vfs_fallocate+0x31c/0x670 fs/open.c:308
>     [<ffffffff815237e3>] madvise_remove mm/madvise.c:965 [inline]
>     [<ffffffff815237e3>] madvise_vma_behavior+0x7d3/0x1000 mm/madvise.c:989
>     [<ffffffff8151f2fc>] madvise_walk_vmas+0x11c/0x1d0 mm/madvise.c:1221
>     [<ffffffff8152437b>] do_madvise mm/madvise.c:1399 [inline]
>     [<ffffffff8152437b>] do_madvise+0x23b/0x320 mm/madvise.c:1357
>     [<ffffffff8152478a>] __do_sys_madvise mm/madvise.c:1412 [inline]
>     [<ffffffff8152478a>] __se_sys_madvise mm/madvise.c:1410 [inline]
>     [<ffffffff8152478a>] __x64_sys_madvise+0x2a/0x30 mm/madvise.c:1410
>     [<ffffffff84565f15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84565f15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> BUG: memory leak
> unreferenced object 0xffff88810cb39d80 (size 576):
>   comm "syz-executor883", pid 3622, jiffies 4294954659 (age 29.170s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     98 f8 cd 0d 81 88 ff ff 98 9d b3 0c 81 88 ff ff  ................
>   backtrace:
>     [<ffffffff8247dfba>] xas_nomem lib/xarray.c:307 [inline]
>     [<ffffffff8247dfba>] xas_nomem+0x4a/0xd0 lib/xarray.c:299
>     [<ffffffff8157b8d0>] split_huge_page_to_list+0x26d0/0x29f0 mm/huge_memory.c:2626
>     [<ffffffff8148a224>] split_huge_page include/linux/huge_mm.h:191 [inline]
>     [<ffffffff8148a224>] truncate_inode_partial_folio+0x3e4/0x5f0 mm/truncate.c:243
>     [<ffffffff814a78a0>] shmem_undo_range+0x3d0/0xbe0 mm/shmem.c:966
>     [<ffffffff814a8e51>] shmem_truncate_range mm/shmem.c:1044 [inline]
>     [<ffffffff814a8e51>] shmem_fallocate+0x1e1/0x910 mm/shmem.c:2671
>     [<ffffffff815b5c6c>] vfs_fallocate+0x31c/0x670 fs/open.c:308
>     [<ffffffff815237e3>] madvise_remove mm/madvise.c:965 [inline]
>     [<ffffffff815237e3>] madvise_vma_behavior+0x7d3/0x1000 mm/madvise.c:989
>     [<ffffffff8151f2fc>] madvise_walk_vmas+0x11c/0x1d0 mm/madvise.c:1221
>     [<ffffffff8152437b>] do_madvise mm/madvise.c:1399 [inline]
>     [<ffffffff8152437b>] do_madvise+0x23b/0x320 mm/madvise.c:1357
>     [<ffffffff8152478a>] __do_sys_madvise mm/madvise.c:1412 [inline]
>     [<ffffffff8152478a>] __se_sys_madvise mm/madvise.c:1410 [inline]
>     [<ffffffff8152478a>] __x64_sys_madvise+0x2a/0x30 mm/madvise.c:1410
>     [<ffffffff84565f15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84565f15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> BUG: memory leak
> unreferenced object 0xffff88810cb35d80 (size 576):
>   comm "syz-executor883", pid 3623, jiffies 4294954631 (age 29.490s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     18 48 36 04 81 88 ff ff 98 5d b3 0c 81 88 ff ff  .H6......]......
>   backtrace:
>     [<ffffffff8247dfba>] xas_nomem lib/xarray.c:307 [inline]
>     [<ffffffff8247dfba>] xas_nomem+0x4a/0xd0 lib/xarray.c:299
>     [<ffffffff8157b8d0>] split_huge_page_to_list+0x26d0/0x29f0 mm/huge_memory.c:2626
>     [<ffffffff8148a224>] split_huge_page include/linux/huge_mm.h:191 [inline]
>     [<ffffffff8148a224>] truncate_inode_partial_folio+0x3e4/0x5f0 mm/truncate.c:243
>     [<ffffffff814a78a0>] shmem_undo_range+0x3d0/0xbe0 mm/shmem.c:966
>     [<ffffffff814a8e51>] shmem_truncate_range mm/shmem.c:1044 [inline]
>     [<ffffffff814a8e51>] shmem_fallocate+0x1e1/0x910 mm/shmem.c:2671
>     [<ffffffff815b5c6c>] vfs_fallocate+0x31c/0x670 fs/open.c:308
>     [<ffffffff815237e3>] madvise_remove mm/madvise.c:965 [inline]
>     [<ffffffff815237e3>] madvise_vma_behavior+0x7d3/0x1000 mm/madvise.c:989
>     [<ffffffff8151f2fc>] madvise_walk_vmas+0x11c/0x1d0 mm/madvise.c:1221
>     [<ffffffff8152437b>] do_madvise mm/madvise.c:1399 [inline]
>     [<ffffffff8152437b>] do_madvise+0x23b/0x320 mm/madvise.c:1357
>     [<ffffffff8152478a>] __do_sys_madvise mm/madvise.c:1412 [inline]
>     [<ffffffff8152478a>] __se_sys_madvise mm/madvise.c:1410 [inline]
>     [<ffffffff8152478a>] __x64_sys_madvise+0x2a/0x30 mm/madvise.c:1410
>     [<ffffffff84565f15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84565f15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> BUG: memory leak
> unreferenced object 0xffff88810cb39d80 (size 576):
>   comm "syz-executor883", pid 3622, jiffies 4294954659 (age 29.210s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     98 f8 cd 0d 81 88 ff ff 98 9d b3 0c 81 88 ff ff  ................
>   backtrace:
>     [<ffffffff8247dfba>] xas_nomem lib/xarray.c:307 [inline]
>     [<ffffffff8247dfba>] xas_nomem+0x4a/0xd0 lib/xarray.c:299
>     [<ffffffff8157b8d0>] split_huge_page_to_list+0x26d0/0x29f0 mm/huge_memory.c:2626
>     [<ffffffff8148a224>] split_huge_page include/linux/huge_mm.h:191 [inline]
>     [<ffffffff8148a224>] truncate_inode_partial_folio+0x3e4/0x5f0 mm/truncate.c:243
>     [<ffffffff814a78a0>] shmem_undo_range+0x3d0/0xbe0 mm/shmem.c:966
>     [<ffffffff814a8e51>] shmem_truncate_range mm/shmem.c:1044 [inline]
>     [<ffffffff814a8e51>] shmem_fallocate+0x1e1/0x910 mm/shmem.c:2671
>     [<ffffffff815b5c6c>] vfs_fallocate+0x31c/0x670 fs/open.c:308
>     [<ffffffff815237e3>] madvise_remove mm/madvise.c:965 [inline]
>     [<ffffffff815237e3>] madvise_vma_behavior+0x7d3/0x1000 mm/madvise.c:989
>     [<ffffffff8151f2fc>] madvise_walk_vmas+0x11c/0x1d0 mm/madvise.c:1221
>     [<ffffffff8152437b>] do_madvise mm/madvise.c:1399 [inline]
>     [<ffffffff8152437b>] do_madvise+0x23b/0x320 mm/madvise.c:1357
>     [<ffffffff8152478a>] __do_sys_madvise mm/madvise.c:1412 [inline]
>     [<ffffffff8152478a>] __se_sys_madvise mm/madvise.c:1410 [inline]
>     [<ffffffff8152478a>] __x64_sys_madvise+0x2a/0x30 mm/madvise.c:1410
>     [<ffffffff84565f15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84565f15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> executing program
> executing program
> executing program
> executing program
> 
> 
> ---
> This report 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@...glegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches