syzbot

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

write to 0xffffea0004722a18 of 8 bytes by task 7051 on cpu 0:
 page_cache_delete mm/filemap.c:153 [inline]
 __filemap_remove_folio+0x1ac/0x2c0 mm/filemap.c:233
 filemap_remove_folio+0x6b/0x1f0 mm/filemap.c:265
 truncate_inode_folio mm/truncate.c:177 [inline]
 truncate_inode_pages_range+0x58a/0x6b0 mm/truncate.c:398
 truncate_inode_pages+0x24/0x30 mm/truncate.c:422
 kill_bdev block/bdev.c:91 [inline]
 set_blocksize+0x258/0x270 block/bdev.c:173
 sb_set_blocksize block/bdev.c:182 [inline]
 sb_min_blocksize+0x63/0xe0 block/bdev.c:198
 ext4_load_super fs/ext4/super.c:5038 [inline]
 __ext4_fill_super fs/ext4/super.c:5259 [inline]
 ext4_fill_super+0x38b/0x3a10 fs/ext4/super.c:5733
 get_tree_bdev_flags+0x29f/0x310 fs/super.c:1636
 get_tree_bdev+0x1f/0x30 fs/super.c:1659
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5765
 vfs_get_tree+0x56/0x1e0 fs/super.c:1814
 do_new_mount+0x227/0x690 fs/namespace.c:3507
 path_mount+0x49b/0xb30 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x27c/0x2d0 fs/namespace.c:4034
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4034
 x64_sys_call+0x2c84/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:166
 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 to 0xffffea0004722a18 of 8 bytes by task 7049 on cpu 1:
 folio_mapping+0xa0/0x120 mm/util.c:855
 folio_evictable mm/internal.h:434 [inline]
 lru_add+0x89/0x440 mm/swap.c:167
 folio_batch_move_lru+0x15f/0x230 mm/swap.c:199
 lru_add_drain_cpu+0x7c/0x260 mm/swap.c:647
 lru_add_drain+0x26/0x80 mm/swap.c:729
 exit_mmap+0x158/0x680 mm/mmap.c:1918
 __mmput+0x28/0x1b0 kernel/fork.c:1348
 mmput+0x4c/0x60 kernel/fork.c:1370
 exit_mm+0xe4/0x190 kernel/exit.c:570
 do_exit+0x55e/0x17f0 kernel/exit.c:925
 do_group_exit+0x102/0x150 kernel/exit.c:1087
 get_signal+0xeb9/0x1000 kernel/signal.c:3016
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x62/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff8881004c1198 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7049 Comm: syz.2.1208 Not tainted 6.12.0-syzkaller-01892-g8f7c8b88bda4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
==================================================================