netlink: 12 bytes leftover after parsing attributes in process `syz.2.6302'.
loop2: detected capacity change from 0 to 512
EXT4-fs: Ignoring removed i_version option
EXT4-fs: Ignoring removed bh option
==================================================================
BUG: KCSAN: data-race in find_get_block_common / has_bh_in_lru

read-write to 0xffff888237d275d0 of 8 bytes by task 23973 on cpu 1:
 bh_lru_install fs/buffer.c:1346 [inline]
 find_get_block_common+0x459/0x890 fs/buffer.c:1411
 bdev_getblk+0x4d/0x3f0 include/linux/gfp.h:-1
 __getblk include/linux/buffer_head.h:380 [inline]
 sb_getblk include/linux/buffer_head.h:386 [inline]
 __ext4_get_inode_loc+0x303/0x930 fs/ext4/inode.c:4835
 ext4_get_inode_loc+0x66/0xe0 fs/ext4/inode.c:4963
 ext4_xattr_ibody_get+0x92/0x2d0 fs/ext4/xattr.c:648
 ext4_xattr_get+0xdc/0x470 fs/ext4/xattr.c:709
 ext4_xattr_security_get+0x32/0x40 fs/ext4/xattr_security.c:20
 __vfs_getxattr+0x2ad/0x2c0 fs/xattr.c:423
 get_vfs_caps_from_disk+0x9e/0x360 security/commoncap.c:694
 get_file_caps security/commoncap.c:785 [inline]
 cap_bprm_creds_from_file+0x1a2/0xcf0 security/commoncap.c:931
 security_bprm_creds_from_file+0x3c/0x70 security/security.c:777
 bprm_creds_from_file fs/exec.c:1589 [inline]
 begin_new_exec+0x1f6/0x1260 fs/exec.c:1097
 load_elf_binary+0x62b/0x1a20 fs/binfmt_elf.c:1010
 search_binary_handler fs/exec.c:1664 [inline]
 exec_binprm fs/exec.c:1696 [inline]
 bprm_execve+0x476/0x9b0 fs/exec.c:1748
 kernel_execve+0x5ea/0x630 fs/exec.c:1892
 call_usermodehelper_exec_async+0x196/0x250 kernel/umh.c:109
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888237d275d0 of 8 bytes by task 23972 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1552
 smp_call_function_many_cond+0x2a9/0xc30 kernel/smp.c:821
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1043
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1561
 kill_bdev block/bdev.c:90 [inline]
 set_blocksize+0x235/0x2c0 block/bdev.c:207
 sb_set_blocksize+0x93/0x170 block/bdev.c:240
 ext4_load_super fs/ext4/super.c:5162 [inline]
 __ext4_fill_super fs/ext4/super.c:5317 [inline]
 ext4_fill_super+0x14a7/0x3800 fs/ext4/super.c:5782
 get_tree_bdev_flags+0x291/0x300 fs/super.c:1694
 get_tree_bdev+0x1f/0x30 fs/super.c:1717
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5814
 vfs_get_tree+0x57/0x1d0 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3760 [inline]
 do_new_mount+0x288/0x8d0 fs/namespace.c:3836
 path_mount+0x4d0/0xbc0 fs/namespace.c:4146
 do_mount fs/namespace.c:4159 [inline]
 __do_sys_mount fs/namespace.c:4348 [inline]
 __se_sys_mount+0x28c/0x2e0 fs/namespace.c:4325
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4325
 x64_sys_call+0x2d61/0x3020 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888100477b60 -> 0xffff888100516a28

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 23972 Comm: syz.2.6302 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
==================================================================
EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
ext4 filesystem being mounted at /141/bus supports timestamps until 2038-01-19 (0x7fffffff)
netlink: 4 bytes leftover after parsing attributes in process `syz.2.6302'.
netlink: 4 bytes leftover after parsing attributes in process `syz.2.6302'.