syzbot

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BUG: KCSAN: data-race in delete_from_page_cache_batch / page_mapping

write to 0xffffea0004b30798 of 8 bytes by task 2981 on cpu 1:
 page_cache_delete_batch mm/filemap.c:319 [inline]
 delete_from_page_cache_batch+0x30c/0x6c0 mm/filemap.c:349
 truncate_inode_pages_range+0x1d5/0xad0 mm/truncate.c:326
 truncate_inode_pages+0x20/0x30 mm/truncate.c:425
 kill_bdev block/bdev.c:77 [inline]
 set_blocksize+0x24e/0x270 block/bdev.c:157
 sb_set_blocksize+0x2c/0xa0 block/bdev.c:166
 ext4_fill_super+0x2287/0x7830 fs/ext4/super.c:4327
 mount_bdev+0x1e8/0x290 fs/super.c:1368
 ext4_mount+0x2d/0x40 fs/ext4/super.c:6515
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x11ec/0x1d20 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x24b/0x2f0 fs/namespace.c:3516
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3516
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffea0004b30798 of 8 bytes by task 566 on cpu 0:
 page_mapping+0x111/0x1c0 mm/util.c:725
 page_evictable mm/internal.h:83 [inline]
 __pagevec_lru_add_fn+0x82/0x490 mm/swap.c:1024
 __pagevec_lru_add+0x189/0x240 mm/swap.c:1052
 lru_add_drain_cpu+0x6a/0x270 mm/swap.c:597
 lru_add_drain mm/swap.c:701 [inline]
 __pagevec_release+0x57/0xa0 mm/swap.c:980
 pagevec_release include/linux/pagevec.h:81 [inline]
 __invalidate_mapping_pages+0x2b4/0x340 mm/truncate.c:509
 invalidate_mapping_pages+0x23/0x30 mm/truncate.c:533
 invalidate_bdev+0x67/0x80 block/bdev.c:88
 ext4_put_super+0x620/0x910 fs/ext4/super.c:1239
 generic_shutdown_super+0xe1/0x230 fs/super.c:465
 kill_block_super+0x4a/0x90 fs/super.c:1395
 deactivate_locked_super+0x65/0xd0 fs/super.c:335
 deactivate_super+0x85/0x90 fs/super.c:366
 cleanup_mnt+0x267/0x2d0 fs/namespace.c:1137
 __cleanup_mnt+0x15/0x20 fs/namespace.c:1144
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff888104bbcd28 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 566 Comm: syz-executor.3 Tainted: G        W         5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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