ext4 filesystem being mounted at /435/file1 supports timestamps until 2038-01-19 (0x7fffffff)
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BUG: KCSAN: data-race in _prb_read_valid / prb_reserve

write to 0xffffffff868a7cd8 of 88 bytes by task 24428 on cpu 1:
 prb_reserve+0x695/0xaf0 kernel/printk/printk_ringbuffer.c:1651
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2299
 vprintk_emit+0x10d/0x580 kernel/printk/printk.c:2399
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2438
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2448
 __ext4_error+0x248/0x320 fs/ext4/super.c:822
 ext4_read_block_bitmap_nowait+0x58c/0x680 fs/ext4/balloc.c:516
 ext4_mb_prefetch+0x143/0x230 fs/ext4/mballoc.c:2842
 ext4_mb_might_prefetch fs/ext4/mballoc.c:2882 [inline]
 ext4_mb_scan_group+0x183/0xf10 fs/ext4/mballoc.c:2927
 ext4_mb_scan_groups_linear fs/ext4/mballoc.c:1146 [inline]
 ext4_mb_scan_groups fs/ext4/mballoc.c:1180 [inline]
 ext4_mb_regular_allocator+0x70a/0x15e0 fs/ext4/mballoc.c:3026
 ext4_mb_new_blocks+0x800/0x2080 fs/ext4/mballoc.c:6295
 ext4_alloc_branch fs/ext4/indirect.c:340 [inline]
 ext4_ind_map_blocks+0xb86/0x14f0 fs/ext4/indirect.c:635
 ext4_map_create_blocks fs/ext4/inode.c:611 [inline]
 ext4_map_blocks+0x598/0xd00 fs/ext4/inode.c:811
 _ext4_get_block+0x10a/0x350 fs/ext4/inode.c:910
 ext4_get_block+0x39/0x50 fs/ext4/inode.c:927
 ext4_block_write_begin+0x5e8/0xc00 fs/ext4/inode.c:1198
 ext4_convert_inline_data_to_extent+0x3df/0x7d0 fs/ext4/ext4_jbd2.h:-1
 ext4_try_to_write_inline_data+0x54/0x90 fs/ext4/inline.c:771
 ext4_write_begin+0x1b3/0xeb0 fs/ext4/inode.c:1302
 ext4_da_write_begin+0x1fb/0x6e0 fs/ext4/inode.c:3129
 generic_perform_write+0x184/0x490 mm/filemap.c:4242
 ext4_buffered_write_iter+0x1ee/0x3c0 fs/ext4/file.c:299
 ext4_file_write_iter+0x387/0xf60 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x52a/0x960 fs/read_write.c:686
 ksys_pwrite64 fs/read_write.c:793 [inline]
 __do_sys_pwrite64 fs/read_write.c:801 [inline]
 __se_sys_pwrite64 fs/read_write.c:798 [inline]
 __x64_sys_pwrite64+0xfd/0x150 fs/read_write.c:798
 x64_sys_call+0xc4d/0x3000 arch/x86/include/generated/asm/syscalls_64.h:19
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff868a7cd8 of 8 bytes by task 24436 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:483 [inline]
 prb_first_seq kernel/printk/printk_ringbuffer.c:1975 [inline]
 _prb_read_valid+0x383/0x920 kernel/printk/printk_ringbuffer.c:2132
 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2203
 printk_get_next_message+0xc8/0x510 kernel/printk/printk.c:2978
 console_emit_next_record kernel/printk/printk.c:3065 [inline]
 console_flush_all+0x290/0x6a0 kernel/printk/printk.c:3199
 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline]
 console_unlock+0xa1/0x2e0 kernel/printk/printk.c:3298
 class_console_lock_destructor include/linux/console.h:669 [inline]
 do_con_write+0x28df/0x2940 drivers/tty/vt/vt.c:3243
 con_write+0x24/0x40 drivers/tty/vt/vt.c:3565
 do_output_char+0x49a/0x500 drivers/tty/n_tty.c:422
 process_output drivers/tty/n_tty.c:486 [inline]
 n_tty_write+0x869/0xb40 drivers/tty/n_tty.c:2388
 iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
 file_tty_write+0x378/0x690 drivers/tty/tty_io.c:1081
 tty_write+0x25/0x30 drivers/tty/tty_io.c:1102
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x52a/0x960 fs/read_write.c:686
 ksys_write+0xda/0x1a0 fs/read_write.c:738
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:746
 x64_sys_call+0x2802/0x3000 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000000022d7 -> 0x00000000000042d7

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 24436 Comm: +}[@ Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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