KCSAN: data-race in delete_from_page_cache_batch / page_mapping (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3cea11cd Linux 5.10-rc2
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=149b5d46500000
kernel config: https://syzkaller.appspot.com/x/.config?x=76dfc991796328d4
dashboard link: https://syzkaller.appspot.com/bug?extid=1836817ad26433eced7e
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project.git 913f6005669cfb590c99865a90bc51ed0983d09d)
CC: [ak...@linux-foundation.org linux-...@vger.kernel.org linu...@kvack.org]

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+183681...@syzkaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in delete_from_page_cache_batch / page_mapping

write to 0xffffea000136c158 of 8 bytes by task 17855 on cpu 1:
page_cache_delete_batch mm/filemap.c:327 [inline]
delete_from_page_cache_batch+0x36b/0x800 mm/filemap.c:358
truncate_inode_pages_range+0x482/0xf20 mm/truncate.c:366
truncate_pagecache_range+0x80/0x90 mm/truncate.c:953
ext4_punch_hole+0x36a/0x9c0 fs/ext4/inode.c:4066
ext4_fallocate+0x11b/0x580 fs/ext4/extents.c:4660
vfs_fallocate+0x43d/0x5d0 fs/open.c:309
ksys_fallocate fs/open.c:332 [inline]
__do_sys_fallocate fs/open.c:340 [inline]
__se_sys_fallocate fs/open.c:338 [inline]
__x64_sys_fallocate+0x75/0xc0 fs/open.c:338
do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffea000136c158 of 8 bytes by task 17888 on cpu 0:
page_mapping+0x13b/0x200 mm/util.c:694
page_evictable mm/internal.h:84 [inline]
__pagevec_lru_add_fn+0xb1/0x550 mm/swap.c:1048
pagevec_lru_move_fn+0xff/0x190 mm/swap.c:227
__pagevec_lru_add mm/swap.c:1070 [inline]
lru_cache_add+0x10b/0x160 mm/swap.c:473
add_to_page_cache_lru+0x150/0x1b0 mm/filemap.c:955
page_cache_ra_unbounded+0x272/0x4c0 mm/readahead.c:222
ondemand_readahead+0x560/0x780 mm/readahead.c:267
page_cache_async_ra+0x1aa/0x1d0 mm/readahead.c:607
page_cache_async_readahead include/linux/pagemap.h:862 [inline]
generic_file_buffered_read+0x455/0x2110 mm/filemap.c:2239
generic_file_read_iter+0x80/0x3d0 mm/filemap.c:2535
ext4_file_read_iter+0x2d0/0x420 fs/ext4/file.c:74
__kernel_read+0x307/0x560 fs/read_write.c:454
integrity_kernel_read+0x4c/0x70 security/integrity/iint.c:191
ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:484 [inline]
ima_calc_file_shash security/integrity/ima/ima_crypto.c:515 [inline]
ima_calc_file_hash+0x9c7/0x1430 security/integrity/ima/ima_crypto.c:580
ima_collect_measurement+0x168/0x300 security/integrity/ima/ima_api.c:250
process_measurement+0x9f1/0x1050 security/integrity/ima/ima_main.c:330
ima_file_check+0x72/0xa0 security/integrity/ima/ima_main.c:498
do_open fs/namei.c:3254 [inline]
path_openat+0x1887/0x20a0 fs/namei.c:3369
do_filp_open+0xbd/0x1d0 fs/namei.c:3396
do_sys_openat2+0xa3/0x240 fs/open.c:1168
do_sys_open fs/open.c:1184 [inline]
__do_sys_open fs/open.c:1192 [inline]
__se_sys_open fs/open.c:1188 [inline]
__x64_sys_open+0xe2/0x110 fs/open.c:1188
do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17888 Comm: syz-executor.5 Not tainted 5.10.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.