EXT4-fs: Ignoring removed bh option
==================================================================
BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff85c68628 of 8 bytes by task 29990 on cpu 0:
 data_alloc+0x291/0x2c0 kernel/printk/printk_ringbuffer.c:1088
 prb_reserve+0x897/0xbc0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x53e/0x800 kernel/printk/printk.c:2228
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x71/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 caif_disconnect_client+0x135/0x140 net/caif/cfcnfg.c:194
 chnl_net_open+0x4ff/0x5a0 net/caif/chnl_net.c:327
 __dev_open+0x1ef/0x2e0 net/core/dev.c:1446
 __dev_change_flags+0x153/0x410 net/core/dev.c:8648
 dev_change_flags+0x59/0xd0 net/core/dev.c:8720
 do_setlink+0x839/0x2440 net/core/rtnetlink.c:2906
 rtnl_setlink+0x255/0x300 net/core/rtnetlink.c:3209
 rtnetlink_rcv_msg+0x80a/0x8c0 net/core/rtnetlink.c:6617
 netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2543
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6635
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x589/0x660 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x1aa/0x230 net/socket.c:1160
 do_iter_readv_writev+0x2b0/0x330
 vfs_writev+0x2e9/0x860 fs/read_write.c:971
 do_writev+0xf8/0x220 fs/read_write.c:1018
 __do_sys_writev fs/read_write.c:1091 [inline]
 __se_sys_writev fs/read_write.c:1088 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1088
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffffffff85c68628 of 8 bytes by task 29987 on cpu 1:
 desc_read kernel/printk/printk_ringbuffer.c:478 [inline]
 desc_push_tail kernel/printk/printk_ringbuffer.c:774 [inline]
 desc_reserve kernel/printk/printk_ringbuffer.c:920 [inline]
 prb_reserve+0x229/0xbc0 kernel/printk/printk_ringbuffer.c:1505
 vprintk_store+0x53e/0x800 kernel/printk/printk.c:2228
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x71/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 __ext4_msg+0x130/0x1a0 fs/ext4/super.c:1008
 ext4_parse_param+0x8cd/0xf80 fs/ext4/super.c:2206
 vfs_parse_fs_param+0x136/0x290 fs/fs_context.c:146
 vfs_parse_fs_string fs/fs_context.c:188 [inline]
 vfs_parse_monolithic_sep fs/fs_context.c:230 [inline]
 generic_parse_monolithic+0x165/0x1d0 fs/fs_context.c:258
 parse_monolithic_mount_data+0x42/0x50 fs/fs_context.c:719
 do_new_mount+0x1fa/0x690 fs/namespace.c:3348
 path_mount+0x496/0xb30 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3875
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x000000000014f840 -> 0x00000000001e4200

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29987 Comm: syz-executor.0 Not tainted 6.8.0-rc7-syzkaller-00231-g09e5c48fea17 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
==================================================================
EXT4-fs: Ignoring removed nobh option
EXT4-fs: Ignoring removed nobh option
EXT4-fs error (device loop0): ext4_validate_block_bitmap:432: comm syz-executor.0: bg 0: block 2: invalid block bitmap