SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=loop8 ino=13
==================================================================
BUG: KCSAN: data-race in _prb_read_valid / data_alloc

write to 0xffffffff86c78b48 of 8 bytes by task 27196 on cpu 0:
 data_alloc+0x310/0x390 kernel/printk/printk_ringbuffer.c:1129
 prb_reserve+0x8d6/0xad0 kernel/printk/printk_ringbuffer.c:1727
 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354
 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 br_set_state+0x2ae/0x3b0 net/bridge/br_stp.c:57
 new_nbp+0x235/0x300 net/bridge/br_if.c:444
 br_add_if+0x1e7/0xa60 net/bridge/br_if.c:586
 br_add_slave+0x2c/0x40 net/bridge/br_device.c:375
 do_set_master+0x390/0x460 net/core/rtnetlink.c:2986
 do_setlink+0x97b/0x2950 net/core/rtnetlink.c:3188
 rtnl_changelink net/core/rtnetlink.c:3800 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3973 [inline]
 rtnl_newlink+0x108a/0x1400 net/core/rtnetlink.c:4110
 rtnetlink_rcv_msg+0x64b/0x720 net/core/rtnetlink.c:6997
 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2555
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:7024
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x5a8/0x680 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1899
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 __sys_sendto+0x42e/0x490 net/socket.c:2265
 __do_sys_sendto net/socket.c:2272 [inline]
 __se_sys_sendto net/socket.c:2268 [inline]
 __x64_sys_sendto+0x76/0x90 net/socket.c:2268
 x64_sys_call+0x2d35/0x3020 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86c78b48 of 16 bytes by task 27208 on cpu 1:
 desc_read kernel/printk/printk_ringbuffer.c:496 [inline]
 desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1934 [inline]
 prb_read kernel/printk/printk_ringbuffer.c:1982 [inline]
 _prb_read_valid+0x1b6/0x950 kernel/printk/printk_ringbuffer.c:2173
 desc_update_last_finalized+0x8f/0x170 kernel/printk/printk_ringbuffer.c:1573
 prb_final_commit+0x111/0x150 kernel/printk/printk_ringbuffer.c:1842
 vprintk_store+0x88b/0x910 kernel/printk/printk.c:2381
 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 inode_doinit_use_xattr+0x29e/0x2d0 security/selinux/hooks.c:1403
 inode_doinit_with_dentry+0x59f/0x7b0 security/selinux/hooks.c:1508
 selinux_d_instantiate+0x27/0x40 security/selinux/hooks.c:6658
 security_d_instantiate+0x76/0x90 security/security.c:3704
 d_splice_alias_ops+0x53/0x320 fs/dcache.c:3141
 d_splice_alias+0x1f/0x30 fs/dcache.c:3206
 ext4_lookup+0x1a6/0x3a0 fs/ext4/namei.c:1812
 lookup_one_qstr_excl+0xc7/0x240 fs/namei.c:1805
 __start_renaming+0xff/0x2a0 fs/namei.c:3884
 filename_renameat2+0x2d0/0x6e0 fs/namei.c:6147
 __do_sys_renameat2 fs/namei.c:6201 [inline]
 __se_sys_renameat2+0x4f/0x1c0 fs/namei.c:6196
 __x64_sys_renameat2+0x67/0x80 fs/namei.c:6196
 x64_sys_call+0x2a12/0x3020 arch/x86/include/generated/asm/syscalls_64.h:317
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 27208 Comm: syz.8.6813 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
==================================================================
SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=loop8 ino=14
SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=loop8 ino=12
SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=loop8 ino=12
SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=loop8 ino=12
SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=loop8 ino=13
SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=loop8 ino=12
SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=loop8 ino=14
EXT4-fs (loop8): unmounting filesystem 00000000-0000-0000-0000-000000000000.