netlink: 52 bytes leftover after parsing attributes in process `syz.5.9845'.
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BUG: KCSAN: data-race in _prb_read_valid / data_alloc

write to 0xffffffff86895f88 of 8 bytes by task 30647 on cpu 1:
 data_alloc+0x271/0x2b0 kernel/printk/printk_ringbuffer.c:1095
 prb_reserve+0x808/0xaf0 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326
 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2475
 parse_rock_ridge_inode_internal+0x87e/0xf50 fs/isofs/rock.c:470
 parse_rock_ridge_inode+0x3d/0xe0 fs/isofs/rock.c:671
 isofs_read_inode fs/isofs/inode.c:1405 [inline]
 __isofs_iget+0xbc7/0x10a0 fs/isofs/inode.c:1509
 isofs_iget fs/isofs/isofs.h:133 [inline]
 isofs_lookup+0x7b8/0x8f0 fs/isofs/namei.c:171
 __lookup_slow+0x190/0x250 fs/namei.c:1817
 lookup_slow+0x3c/0x60 fs/namei.c:1834
 walk_component+0x1ec/0x220 fs/namei.c:2138
 lookup_last fs/namei.c:2636 [inline]
 path_lookupat+0xfe/0x2a0 fs/namei.c:2660
 filename_lookup+0x147/0x340 fs/namei.c:2689
 user_path_at+0x3e/0x130 fs/namei.c:3120
 do_utimes_path fs/utimes.c:95 [inline]
 do_utimes+0xd9/0x210 fs/utimes.c:140
 do_futimesat fs/utimes.c:194 [inline]
 __do_sys_futimesat fs/utimes.c:201 [inline]
 __se_sys_futimesat fs/utimes.c:198 [inline]
 __x64_sys_futimesat+0xd2/0x1a0 fs/utimes.c:198
 x64_sys_call+0x11da/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:262
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86895f88 of 16 bytes by task 30630 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:482 [inline]
 desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1874 [inline]
 prb_read kernel/printk/printk_ringbuffer.c:1922 [inline]
 _prb_read_valid+0x1bc/0x920 kernel/printk/printk_ringbuffer.c:2113
 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2185
 __console_flush_and_unlock kernel/printk/printk.c:3304 [inline]
 console_unlock+0x164/0x330 kernel/printk/printk.c:3325
 con_flush_chars+0xb2/0x1b0 drivers/tty/vt/vt.c:3503
 con_write+0x2e/0x40 drivers/tty/vt/vt.c:3433
 process_output_block drivers/tty/n_tty.c:561 [inline]
 n_tty_write+0x7d8/0xb10 drivers/tty/n_tty.c:2377
 iterate_tty_write drivers/tty/tty_io.c:1015 [inline]
 file_tty_write+0x389/0x670 drivers/tty/tty_io.c:1090
 tty_write+0x25/0x30 drivers/tty/tty_io.c:1111
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x49d/0x8d0 fs/read_write.c:684
 ksys_write+0xda/0x1a0 fs/read_write.c:736
 __do_sys_write fs/read_write.c:747 [inline]
 __se_sys_write fs/read_write.c:744 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:744
 x64_sys_call+0x2cdd/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 30630 Comm: syz.5.9845 Not tainted 6.15.0-rc5-syzkaller-00136-g9c69f8884904 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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