linux-kernel - [syzbot] [fs?] [mm?] KCSAN: data-race in read_pages / read

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Message-ID: <676dce37.050a0220.2f3838.0472.GAE@google.com>
Date: Thu, 26 Dec 2024 13:44:23 -0800
From: syzbot <syzbot+e1d2475cbd1f0c63692f@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	syzkaller-bugs@...glegroups.com, willy@...radead.org
Subject: [syzbot] [fs?] [mm?] KCSAN: data-race in read_pages / read_pages (4)

Hello,

syzbot found the following issue on:

HEAD commit:    9b2ffa6148b1 Merge tag 'mtd/fixes-for-6.13-rc5' of git://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10431018580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=87d3cfca6847d1fa
dashboard link: https://syzkaller.appspot.com/bug?extid=e1d2475cbd1f0c63692f
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8f3f5cceed80/disk-9b2ffa61.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1ba00b70d91e/vmlinux-9b2ffa61.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b99c1bb4d63f/bzImage-9b2ffa61.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e1d2475cbd1f0c63692f@...kaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in read_pages / read_pages

read-write to 0xffff8881034df5e0 of 4 bytes by task 9479 on cpu 1:
 read_pages+0x23f/0x540 mm/readahead.c:170
 page_cache_ra_unbounded+0x2b8/0x310 mm/readahead.c:295
 do_page_cache_ra mm/readahead.c:325 [inline]
 page_cache_ra_order mm/readahead.c:524 [inline]
 page_cache_async_ra+0x40c/0x420 mm/readahead.c:674
 do_async_mmap_readahead mm/filemap.c:3231 [inline]
 filemap_fault+0x2d1/0xb30 mm/filemap.c:3330
 __do_fault+0xb6/0x200 mm/memory.c:4907
 do_read_fault mm/memory.c:5322 [inline]
 do_fault mm/memory.c:5456 [inline]
 do_pte_missing mm/memory.c:3979 [inline]
 handle_pte_fault mm/memory.c:5801 [inline]
 __handle_mm_fault mm/memory.c:5944 [inline]
 handle_mm_fault+0xe98/0x2ac0 mm/memory.c:6112
 faultin_page mm/gup.c:1196 [inline]
 __get_user_pages+0xf2c/0x2670 mm/gup.c:1494
 populate_vma_page_range mm/gup.c:1932 [inline]
 __mm_populate+0x25b/0x3b0 mm/gup.c:2035
 do_mlock+0x415/0x510 mm/mlock.c:653
 __do_sys_mlock mm/mlock.c:661 [inline]
 __se_sys_mlock mm/mlock.c:659 [inline]
 __x64_sys_mlock+0x36/0x40 mm/mlock.c:659
 x64_sys_call+0x26b2/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:150
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read-write to 0xffff8881034df5e0 of 4 bytes by task 9477 on cpu 0:
 read_pages+0x23f/0x540 mm/readahead.c:170
 page_cache_ra_unbounded+0x266/0x310
 do_page_cache_ra mm/readahead.c:325 [inline]
 page_cache_ra_order+0xf7/0x110 mm/readahead.c:524
 do_sync_mmap_readahead+0x267/0x2a0 mm/filemap.c:3203
 filemap_fault+0x32f/0xb30 mm/filemap.c:3344
 __do_fault+0xb6/0x200 mm/memory.c:4907
 do_read_fault mm/memory.c:5322 [inline]
 do_fault mm/memory.c:5456 [inline]
 do_pte_missing mm/memory.c:3979 [inline]
 handle_pte_fault mm/memory.c:5801 [inline]
 __handle_mm_fault mm/memory.c:5944 [inline]
 handle_mm_fault+0xe98/0x2ac0 mm/memory.c:6112
 faultin_page mm/gup.c:1196 [inline]
 __get_user_pages+0xf2c/0x2670 mm/gup.c:1494
 populate_vma_page_range mm/gup.c:1932 [inline]
 __mm_populate+0x25b/0x3b0 mm/gup.c:2035
 mm_populate include/linux/mm.h:3396 [inline]
 vm_mmap_pgoff+0x1d6/0x290 mm/util.c:585
 ksys_mmap_pgoff+0x286/0x330 mm/mmap.c:542
 x64_sys_call+0x1940/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000001f -> 0x0000001c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9477 Comm: syz.5.1573 Tainted: G        W          6.13.0-rc4-syzkaller-00012-g9b2ffa6148b1 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================


---
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