EXT4-fs error (device loop0): ext4_mb_generate_buddy:1098: group 0, 
==================================================================
BUG: KCSAN: data-race in data_alloc / data_push_tail

write to 0xffffffff86ec1b90 of 8 bytes by task 10185 on cpu 1:
 data_alloc+0x205/0x2b0 kernel/printk/printk_ringbuffer.c:1074
 prb_reserve+0x897/0xbd0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x50b/0xad0 kernel/printk/printk.c:2282
 vprintk_emit+0xcc/0x430 kernel/printk/printk.c:2338
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2368
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0xa0 kernel/printk/printk.c:2378
 __ext4_msg+0x174/0x180 fs/ext4/super.c:937
 ext4_orphan_cleanup+0x93d/0xa00 fs/ext4/orphan.c:497
 __ext4_fill_super fs/ext4/super.c:5516 [inline]
 ext4_fill_super+0x4237/0x4500 fs/ext4/super.c:5644
 get_tree_bdev+0x2b4/0x3b0 fs/super.c:1282
 ext4_get_tree+0x18/0x20 fs/ext4/super.c:5675
 vfs_get_tree+0x49/0x190 fs/super.c:1489
 do_new_mount+0x200/0x650 fs/namespace.c:3145
 path_mount+0x4aa/0xb70 fs/namespace.c:3475
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3697 [inline]
 __se_sys_mount+0x281/0x2d0 fs/namespace.c:3674
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3674
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff86ec1b90 of 8 bytes by task 10195 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
 data_push_tail+0x10f/0x440 kernel/printk/printk_ringbuffer.c:675
 data_alloc+0xbc/0x2b0 kernel/printk/printk_ringbuffer.c:1046
 prb_reserve+0x897/0xbd0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x50b/0xad0 kernel/printk/printk.c:2282
 vprintk_emit+0xcc/0x430 kernel/printk/printk.c:2338
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2368
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0xa0 kernel/printk/printk.c:2378
 __ext4_grp_locked_error+0x4dd/0x710 fs/ext4/super.c:1003
 ext4_mb_generate_buddy+0x4bb/0x550 fs/ext4/mballoc.c:1095
 ext4_mb_init_cache+0xbb0/0xf00 fs/ext4/mballoc.c:1261
 ext4_mb_init_group+0x29e/0x480 fs/ext4/mballoc.c:1394
 ext4_mb_load_buddy_gfp+0x89c/0x1010 fs/ext4/mballoc.c:1462
 ext4_mb_clear_bb+0x4f5/0x12a0 fs/ext4/mballoc.c:5974
 ext4_free_blocks+0x77d/0x890 fs/ext4/mballoc.c:6173
 ext4_free_branches+0x320/0x440 fs/ext4/indirect.c:1082
 ext4_ind_truncate+0x783/0x8b0 fs/ext4/indirect.c:1193
 ext4_truncate+0x762/0xaf0 fs/ext4/inode.c:4344
 ext4_process_orphan+0x115/0x1c0 fs/ext4/orphan.c:339
 ext4_orphan_cleanup+0x690/0xa00 fs/ext4/orphan.c:474
 __ext4_fill_super fs/ext4/super.c:5516 [inline]
 ext4_fill_super+0x4237/0x4500 fs/ext4/super.c:5644
 get_tree_bdev+0x2b4/0x3b0 fs/super.c:1282
 ext4_get_tree+0x18/0x20 fs/ext4/super.c:5675
 vfs_get_tree+0x49/0x190 fs/super.c:1489
 do_new_mount+0x200/0x650 fs/namespace.c:3145
 path_mount+0x4aa/0xb70 fs/namespace.c:3475
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3697 [inline]
 __se_sys_mount+0x281/0x2d0 fs/namespace.c:3674
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3674
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000001000112f4 -> 0x0000000100011bcc

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10195 Comm: syz-executor.0 Not tainted 6.2.0-rc1-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
==================================================================
block bitmap and bg descriptor inconsistent: 191 vs 220 free clusters
EXT4-fs error (device loop0): ext4_clear_blocks:875: inode #13: comm syz-executor.0: attempt to clear invalid blocks 33619980 len 1
EXT4-fs error (device loop0): ext4_free_branches:1022: inode #13: comm syz-executor.0: invalid indirect mapped block 1819239214 (level 0)
EXT4-fs error (device loop0): ext4_free_branches:1022: inode #13: comm syz-executor.0: invalid indirect mapped block 1819239214 (level 1)
EXT4-fs (loop0): 1 truncate cleaned up
syz-executor.0 (10195) used greatest stack depth: 8912 bytes left