[EXT4 FS bs=1024, gc=1, bpg=8192, ipg=32, mo=a002c11c, mo2=0002]
==================================================================
BUG: KCSAN: data-race in data_alloc / data_push_tail

write to 0xffffffff86f19568 of 8 bytes by task 12714 on cpu 1:
 data_alloc+0x216/0x2c0 kernel/printk/printk_ringbuffer.c:1074
 prb_reserve+0x893/0xbc0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x53e/0x800 kernel/printk/printk.c:2232
 vprintk_emit+0xd0/0x430 kernel/printk/printk.c:2288
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x83/0x90 kernel/printk/printk_safe.c:50
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 __ext4_msg+0x18a/0x1a0 fs/ext4/super.c:937
 ext4_get_journal_inode+0x4f/0x130
 ext4_calculate_overhead+0x876/0x980 fs/ext4/super.c:4226
 __ext4_fill_super fs/ext4/super.c:5424 [inline]
 ext4_fill_super+0x2e18/0x38f0 fs/ext4/super.c:5672
 get_tree_bdev+0x2a8/0x3a0 fs/super.c:1303
 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5704
 vfs_get_tree+0x51/0x190 fs/super.c:1510
 do_new_mount+0x203/0x660 fs/namespace.c:3039
 path_mount+0x498/0xb40 fs/namespace.c:3369
 do_mount fs/namespace.c:3382 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3568
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff86f19568 of 8 bytes by task 12702 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:675
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1046
 prb_reserve+0x893/0xbc0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x53e/0x800 kernel/printk/printk.c:2232
 vprintk_emit+0xd0/0x430 kernel/printk/printk.c:2288
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x83/0x90 kernel/printk/printk_safe.c:50
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 ext4_setup_super+0x554/0x560 fs/ext4/super.c:3116
 __ext4_fill_super fs/ext4/super.c:5467 [inline]
 ext4_fill_super+0x2fa3/0x38f0 fs/ext4/super.c:5672
 get_tree_bdev+0x2a8/0x3a0 fs/super.c:1303
 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5704
 vfs_get_tree+0x51/0x190 fs/super.c:1510
 do_new_mount+0x203/0x660 fs/namespace.c:3039
 path_mount+0x498/0xb40 fs/namespace.c:3369
 do_mount fs/namespace.c:3382 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3568
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x000000010000c89a -> 0x000000010000d722

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12702 Comm: syz-executor.4 Not tainted 6.4.0-rc6-syzkaller-00242-g1639fae5132b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
==================================================================
EXT4-fs (loop4): failed to initialize system zone (-22)
EXT4-fs (loop4): mount failed