bridge0: port 3(macvlan2) entered blocking state
bridge0: port 3(macvlan2) entered disabled state
macvlan2: entered allmulticast mode
macvlan2: left allmulticast mode
==================================================================
BUG: KCSAN: data-race in desc_read_finalized_seq / prb_reserve

write to 0xffffffff868a3a00 of 8 bytes by task 21552 on cpu 1:
 prb_reserve+0x750/0xb80 kernel/printk/printk_ringbuffer.c:-1
 vprintk_store+0x552/0x860 kernel/printk/printk.c:2326
 vprintk_emit+0x1a0/0x6c0 kernel/printk/printk.c:2426
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x7f/0xb0 kernel/printk/printk.c:2475
 __ext4_error_inode+0x2e7/0x410 fs/ext4/super.c:848
 ext4_do_update_inode fs/ext4/inode.c:5194 [inline]
 ext4_mark_iloc_dirty+0x383/0xdb0 fs/ext4/inode.c:5852
 ext4_ioctl_setflags fs/ext4/ioctl.c:679 [inline]
 ext4_fileattr_set+0x92f/0xe20 fs/ext4/ioctl.c:1021
 vfs_fileattr_set+0x5d0/0x5f0 fs/ioctl.c:696
 do_vfs_ioctl+0x1216/0x1570 fs/ioctl.c:-1
 __do_sys_ioctl fs/ioctl.c:904 [inline]
 __se_sys_ioctl+0x80/0x140 fs/ioctl.c:892
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:892
 x64_sys_call+0x168d/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff868a3a00 of 8 bytes by task 21562 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:486 [inline]
 desc_read_finalized_seq+0x163/0x280 kernel/printk/printk_ringbuffer.c:1874
 prb_read kernel/printk/printk_ringbuffer.c:1922 [inline]
 _prb_read_valid+0x142/0x710 kernel/printk/printk_ringbuffer.c:2113
 desc_update_last_finalized kernel/printk/printk_ringbuffer.c:1515 [inline]
 prb_final_commit+0x147/0x200 kernel/printk/printk_ringbuffer.c:1782
 vprintk_store+0x737/0x860 kernel/printk/printk.c:2352
 vprintk_emit+0x1a0/0x6c0 kernel/printk/printk.c:2426
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x7f/0xb0 kernel/printk/printk.c:2475
 __netdev_printk+0x2d1/0x3e0 net/core/dev.c:12400
 netdev_info+0x9e/0xd0 net/core/dev.c:12447
 netif_set_allmulti+0x15f/0x250 net/core/dev.c:9249
 dev_set_allmulti+0xd4/0x190 net/core/dev_api.c:295
 br_add_if+0x441/0xa50 net/bridge/br_if.c:720
 br_add_slave+0x2c/0x40 net/bridge/br_device.c:375
 do_set_master+0x3c0/0x4a0 net/core/rtnetlink.c:2943
 rtnl_newlink_create+0x431/0x640 net/core/rtnetlink.c:3844
 __rtnl_newlink net/core/rtnetlink.c:3947 [inline]
 rtnl_newlink+0xf38/0x12d0 net/core/rtnetlink.c:4062
 rtnetlink_rcv_msg+0x65a/0x740 net/core/rtnetlink.c:6952
 netlink_rcv_skb+0x12f/0x230 net/netlink/af_netlink.c:2534
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6979
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x605/0x6c0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x609/0x720 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:727
 ____sys_sendmsg+0x350/0x4e0 net/socket.c:2566
 ___sys_sendmsg net/socket.c:2620 [inline]
 __sys_sendmsg+0x1a0/0x240 net/socket.c:2652
 __do_sys_sendmsg net/socket.c:2657 [inline]
 __se_sys_sendmsg net/socket.c:2655 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2655
 x64_sys_call+0x26f3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000000000000222e -> 0x000000000000422e

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 21562 Comm: syz.6.6372 Not tainted 6.14.0-syzkaller-11144-g1e7857b28020 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================