syzbot

bridge_slave_0: entered promiscuous mode
bridge0: port 2(bridge_slave_1) entered blocking state
bridge0: port 2(bridge_slave_1) entered disabled state
==================================================================
BUG: KCSAN: data-race in data_alloc / data_push_tail

write to 0xffffffff886348a0 of 8 bytes by task 8052 on cpu 1:
 data_alloc+0x216/0x2c0 kernel/printk/printk_ringbuffer.c:1082
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x53f/0x810 kernel/printk/printk.c:2269
 vprintk_emit+0x10c/0x5e0 kernel/printk/printk.c:2329
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2363
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2373
 rock_continue+0x2e9/0x2f0 fs/isofs/rock.c:127
 parse_rock_ridge_inode_internal+0xeb6/0xfb0 fs/isofs/rock.c:586
 parse_rock_ridge_inode+0x3e/0xe0 fs/isofs/rock.c:671
 isofs_read_inode fs/isofs/inode.c:1408 [inline]
 __isofs_iget+0xb3f/0xf90 fs/isofs/inode.c:1512
 isofs_iget fs/isofs/isofs.h:133 [inline]
 isofs_fill_super+0xd8c/0x1290 fs/isofs/inode.c:864
 get_tree_bdev+0x256/0x2e0 fs/super.c:1624
 isofs_get_tree+0x1c/0x30 fs/isofs/inode.c:1526
 vfs_get_tree+0x56/0x1d0 fs/super.c:1789
 do_new_mount+0x227/0x690 fs/namespace.c:3472
 path_mount+0x49b/0xb30 fs/namespace.c:3799
 do_mount fs/namespace.c:3812 [inline]
 __do_sys_mount fs/namespace.c:4020 [inline]
 __se_sys_mount+0x27c/0x2d0 fs/namespace.c:3997
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3997
 x64_sys_call+0xd11/0x2e00 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 0xffffffff886348a0 of 8 bytes by task 8000 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:679
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1054
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x53f/0x810 kernel/printk/printk.c:2269
 vprintk_emit+0x10c/0x5e0 kernel/printk/printk.c:2329
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2363
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2373
 br_set_state+0x290/0x390 net/bridge/br_stp.c:57
 new_nbp+0x240/0x310 net/bridge/br_if.c:443
 br_add_if+0x1ef/0xa50 net/bridge/br_if.c:599
 br_add_slave+0x2c/0x40 net/bridge/br_device.c:373
 do_set_master net/core/rtnetlink.c:2701 [inline]
 do_setlink+0x968/0x2490 net/core/rtnetlink.c:2907
 __rtnl_newlink net/core/rtnetlink.c:3696 [inline]
 rtnl_newlink+0x11a3/0x1690 net/core/rtnetlink.c:3743
 rtnetlink_rcv_msg+0x6aa/0x710 net/core/rtnetlink.c:6647
 netlink_rcv_skb+0x12c/0x230 net/netlink/af_netlink.c:2550
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6665
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x593/0x670 net/netlink/af_netlink.c:1357
 netlink_sendmsg+0x5cc/0x6e0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:745
 __sys_sendto+0x1e5/0x260 net/socket.c:2204
 __do_sys_sendto net/socket.c:2216 [inline]
 __se_sys_sendto net/socket.c:2212 [inline]
 __x64_sys_sendto+0x78/0x90 net/socket.c:2212
 x64_sys_call+0x2bc6/0x2e00 arch/x86/include/generated/asm/syscalls_64.h:45
 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

value changed: 0x00000000ffffed5e -> 0x00000000fffffab0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 8000 Comm: syz-executor Not tainted 6.10.0-syzkaller-12246-g786c8248dbd3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
==================================================================
bridge_slave_1: entered allmulticast mode
bridge_slave_1: entered promiscuous mode