loop2: detected capacity change from 0 to 512 EXT4-fs: Ignoring removed nobh option ================================================================== BUG: KCSAN: data-race in find_get_block_common / has_bh_in_lru read-write to 0xffff888237c26f10 of 8 bytes by task 3817 on cpu 0: bh_lru_install fs/buffer.c:1351 [inline] find_get_block_common+0x4f0/0x960 fs/buffer.c:1416 __find_get_block_nonatomic fs/buffer.c:1435 [inline] bdev_getblk+0x83/0x3d0 fs/buffer.c:1459 __getblk include/linux/buffer_head.h:382 [inline] sb_getblk include/linux/buffer_head.h:388 [inline] __ext4_get_inode_loc+0x303/0x930 fs/ext4/inode.c:4797 ext4_get_inode_loc fs/ext4/inode.c:4925 [inline] ext4_reserve_inode_write+0xd7/0x250 fs/ext4/inode.c:6244 __ext4_mark_inode_dirty+0x8c/0x3f0 fs/ext4/inode.c:6422 ext4_dirty_inode+0x92/0xc0 fs/ext4/inode.c:6459 __mark_inode_dirty+0x15c/0x760 fs/fs-writeback.c:2527 generic_update_time fs/inode.c:2064 [inline] inode_update_time fs/inode.c:2077 [inline] __file_update_time fs/inode.c:2305 [inline] file_update_time+0x288/0x2b0 fs/inode.c:2335 ext4_page_mkwrite+0x18b/0xba0 fs/ext4/inode.c:6577 do_page_mkwrite mm/memory.c:3378 [inline] do_shared_fault mm/memory.c:5666 [inline] do_fault mm/memory.c:5728 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6069 [inline] __handle_mm_fault mm/memory.c:6212 [inline] handle_mm_fault+0x15ce/0x2be0 mm/memory.c:6381 do_user_addr_fault+0x636/0x1090 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 read to 0xffff888237c26f10 of 8 bytes by task 3828 on cpu 1: has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1557 smp_call_function_many_cond+0x38c/0xbf0 kernel/smp.c:838 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1052 on_each_cpu_cond include/linux/smp.h:105 [inline] invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1566 kill_bdev block/bdev.c:90 [inline] set_blocksize+0x24f/0x310 block/bdev.c:207 sb_set_blocksize+0x7a/0x100 block/bdev.c:224 ext4_load_super fs/ext4/super.c:5110 [inline] __ext4_fill_super fs/ext4/super.c:5262 [inline] ext4_fill_super+0x12ab/0x34e0 fs/ext4/super.c:5724 get_tree_bdev_flags+0x291/0x300 fs/super.c:1681 get_tree_bdev+0x1f/0x30 fs/super.c:1704 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5756 vfs_get_tree+0x54/0x1d0 fs/super.c:1804 do_new_mount+0x207/0x680 fs/namespace.c:3902 path_mount+0x4a4/0xb20 fs/namespace.c:4226 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4427 __x64_sys_mount+0x67/0x80 fs/namespace.c:4427 x64_sys_call+0xd36/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0xffff88810047bd00 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 3828 Comm: syz.2.77 Not tainted 6.16.0-rc4-syzkaller-00123-g4c06e63b9203 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ================================================================== EXT4-fs error (device loop2): ext4_do_update_inode:5568: inode #3: comm syz.2.77: corrupted inode contents EXT4-fs error (device loop2): ext4_dirty_inode:6459: inode #3: comm syz.2.77: mark_inode_dirty error EXT4-fs error (device loop2): ext4_do_update_inode:5568: inode #3: comm syz.2.77: corrupted inode contents EXT4-fs error (device loop2): __ext4_ext_dirty:206: inode #3: comm syz.2.77: mark_inode_dirty error EXT4-fs error (device loop2): ext4_acquire_dquot:6933: comm syz.2.77: Failed to acquire dquot type 0 EXT4-fs error (device loop2): ext4_do_update_inode:5568: inode #16: comm syz.2.77: corrupted inode contents EXT4-fs error (device loop2): ext4_dirty_inode:6459: inode #16: comm syz.2.77: mark_inode_dirty error EXT4-fs error (device loop2): ext4_do_update_inode:5568: inode #16: comm syz.2.77: corrupted inode contents EXT4-fs error (device loop2): __ext4_ext_dirty:206: inode #16: comm syz.2.77: mark_inode_dirty error EXT4-fs error (device loop2): ext4_do_update_inode:5568: inode #16: comm syz.2.77: corrupted inode contents EXT4-fs error (device loop2) in ext4_orphan_del:305: Corrupt filesystem EXT4-fs error (device loop2): ext4_do_update_inode:5568: inode #16: comm syz.2.77: corrupted inode contents EXT4-fs error (device loop2): ext4_truncate:4597: inode #16: comm syz.2.77: mark_inode_dirty error EXT4-fs error (device loop2) in ext4_process_orphan:347: Corrupt filesystem EXT4-fs (loop2): 1 truncate cleaned up EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /17/file0 supports timestamps until 2038-01-19 (0x7fffffff) EXT4-fs error (device loop2): ext4_acquire_dquot:6933: comm syz.2.77: Failed to acquire dquot type 1