EXT4-fs warning (device loop6): ext4_evict_inode:259: couldn't mark inode dirty (err -117)
EXT4-fs (loop6): 1 orphan inode deleted
EXT4-fs (loop6): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
==================================================================
BUG: KCSAN: data-race in desc_read_finalized_seq / prb_reserve

write to 0xffffffff866c18f8 of 8 bytes by task 31 on cpu 0:
 prb_reserve+0x740/0xb60
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x168/0x690 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 __ext4_error_inode+0x30b/0x400 fs/ext4/super.c:856
 ext4_map_blocks+0xa85/0xd20
 ext4_getblk+0x11f/0x530 fs/ext4/inode.c:849
 ext4_bread+0x2c/0x110 fs/ext4/inode.c:912
 ext4_quota_read+0x105/0x1c0 fs/ext4/super.c:7228
 read_blk fs/quota/quota_tree.c:61 [inline]
 remove_tree+0x12a/0x1120 fs/quota/quota_tree.c:555
 qtree_delete_dquot fs/quota/quota_tree.c:617 [inline]
 qtree_release_dquot+0x16f/0x180 fs/quota/quota_tree.c:787
 v2_release_dquot+0x96/0xd0 fs/quota/quota_v2.c:391
 dquot_release+0x11a/0x230 fs/quota/dquot.c:537
 ext4_release_dquot+0x12d/0x1e0
 quota_release_workfn+0x252/0x540 fs/quota/dquot.c:840
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4db/0xa20 kernel/workqueue.c:3319
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3400
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffffffff866c18f8 of 8 bytes by task 22021 on cpu 1:
 desc_read kernel/printk/printk_ringbuffer.c:486 [inline]
 desc_read_finalized_seq+0x157/0x280 kernel/printk/printk_ringbuffer.c:1874
 prb_read kernel/printk/printk_ringbuffer.c:1922 [inline]
 _prb_read_valid+0x140/0x6c0 kernel/printk/printk_ringbuffer.c:2113
 prb_read_valid+0x3d/0x60 kernel/printk/printk_ringbuffer.c:2182
 printk_get_next_message+0xd8/0x530 kernel/printk/printk.c:2989
 console_emit_next_record kernel/printk/printk.c:3076 [inline]
 console_flush_all+0x2a7/0x790 kernel/printk/printk.c:3210
 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
 console_unlock+0xb6/0x340 kernel/printk/printk.c:3309
 vprintk_emit+0x408/0x690 kernel/printk/printk.c:2432
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 __ext4_msg+0x18e/0x1a0 fs/ext4/super.c:998
 ext4_fill_super+0x1760/0x3630 fs/ext4/super.c:5737
 get_tree_bdev_flags+0x29f/0x310 fs/super.c:1636
 get_tree_bdev+0x1f/0x30 fs/super.c:1659
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5754
 vfs_get_tree+0x56/0x1e0 fs/super.c:1814
 do_new_mount+0x227/0x690 fs/namespace.c:3560
 path_mount+0x49b/0xb30 fs/namespace.c:3887
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:4088
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4088
 x64_sys_call+0x2c84/0x2dc0 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

value changed: 0x0000000000002807 -> 0x0000000000004807

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 22021 Comm: syz.6.6321 Not tainted 6.14.0-rc7-syzkaller-00205-g586de92313fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================
EXT4-fs error (device loop6): ext4_map_blocks:671: inode #2: block 16: comm syz.6.6321: lblock 0 mapped to illegal pblock 16 (length 1)
EXT4-fs error (device loop6): __ext4_get_inode_loc:4435: comm syz.6.6321: Invalid inode table block 1 in block_group 0
EXT4-fs error (device loop6) in ext4_reserve_inode_write:5838: Corrupt filesystem
EXT4-fs error (device loop6): ext4_dirty_inode:6042: inode #2: comm syz.6.6321: mark_inode_dirty error