syzbot

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

write to 0xffffea00048da418 of 8 bytes by task 13491 on cpu 1:
 page_cache_delete_batch mm/filemap.c:304 [inline]
 delete_from_page_cache_batch+0x301/0x760 mm/filemap.c:330
 truncate_inode_pages_range+0x305/0x8b0 mm/truncate.c:379
 truncate_inode_pages mm/truncate.c:461 [inline]
 truncate_pagecache+0x4f/0x70 mm/truncate.c:768
 ext4_setattr+0x7a0/0xb30 fs/ext4/inode.c:5452
 notify_change+0x924/0xbf0 fs/attr.c:410
 do_truncate+0xf7/0x140 fs/open.c:65
 handle_truncate fs/namei.c:3132 [inline]
 do_open fs/namei.c:3480 [inline]
 path_openat+0x1873/0x1f30 fs/namei.c:3609
 do_filp_open+0x105/0x220 fs/namei.c:3636
 do_sys_openat2+0xb5/0x2b0 fs/open.c:1214
 do_sys_open fs/open.c:1230 [inline]
 __do_sys_openat fs/open.c:1246 [inline]
 __se_sys_openat fs/open.c:1241 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1241
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffea00048da418 of 8 bytes by task 13501 on cpu 0:
 folio_mapping+0x92/0x120 mm/util.c:717
 page_mapping+0x37/0x50 mm/folio-compat.c:13
 page_evictable mm/internal.h:133 [inline]
 shrink_active_list+0x27c/0x960 mm/vmscan.c:2536
 shrink_list mm/vmscan.c:2658 [inline]
 shrink_lruvec+0x3a5/0x710 mm/vmscan.c:2983
 shrink_node_memcgs+0x23e/0x410 mm/vmscan.c:3172
 shrink_node+0x8f6/0x1190 mm/vmscan.c:3295
 shrink_zones+0x2d1/0x5e0 mm/vmscan.c:3532
 do_try_to_free_pages+0x181/0x720 mm/vmscan.c:3590
 try_to_free_mem_cgroup_pages+0x1cb/0x420 mm/vmscan.c:3904
 memory_high_write+0x13f/0x180 mm/memcontrol.c:6257
 cgroup_file_write+0x161/0x300 kernel/cgroup/cgroup.c:3882
 kernfs_fop_write_iter+0x1d3/0x2d0 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2074 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x7f5/0x950 fs/read_write.c:590
 ksys_write+0xd9/0x190 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff88812e94b8f0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13501 Comm: syz-executor.2 Not tainted 5.17.0-syzkaller-01442-gb47d5a4f6b8d-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================