================================================================== BUG: KCSAN: data-race in data_push_tail / number write to 0xffffffff88f11de8 of 1 bytes by task 35 on cpu 0: number+0x915/0xb50 lib/vsprintf.c:529 vsnprintf+0xb6d/0xed0 lib/vsprintf.c:2717 vscnprintf+0x29/0x80 lib/vsprintf.c:2754 printk_sprint kernel/printk/printk.c:1936 [inline] vprintk_store+0x4c1/0x9c0 kernel/printk/printk.c:2039 vprintk_emit+0xca/0x3e0 kernel/printk/printk.c:2081 vprintk_default+0x22/0x30 kernel/printk/printk.c:2115 vprintk_func+0x11b/0x120 kernel/printk/printk_safe.c:401 printk+0x62/0x82 kernel/printk/printk.c:2146 kauditd_printk_skb kernel/audit.c:538 [inline] kauditd_hold_skb+0x12d/0x140 kernel/audit.c:571 kauditd_send_queue+0x68/0x290 kernel/audit.c:734 kauditd_thread+0x3cd/0x6d0 kernel/audit.c:860 kthread+0x20b/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffffffff88f11de8 of 8 bytes by task 6763 on cpu 1: data_make_reusable kernel/printk/printk_ringbuffer.c:587 [inline] data_push_tail+0x125/0x460 kernel/printk/printk_ringbuffer.c:672 data_alloc+0xbc/0x2b0 kernel/printk/printk_ringbuffer.c:1043 prb_reserve+0x8f0/0xbc0 kernel/printk/printk_ringbuffer.c:1549 vprintk_store+0x3e9/0x9c0 kernel/printk/printk.c:2029 vprintk_emit+0xca/0x3e0 kernel/printk/printk.c:2081 vprintk_default+0x22/0x30 kernel/printk/printk.c:2115 vprintk_func+0x11b/0x120 kernel/printk/printk_safe.c:401 printk+0x62/0x82 kernel/printk/printk.c:2146 isofs_fill_super+0x1922/0x1940 fs/isofs/inode.c:706 mount_bdev+0x1e8/0x290 fs/super.c:1367 isofs_mount+0x2d/0x40 fs/isofs/inode.c:1566 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592 vfs_get_tree+0x4a/0x1a0 fs/super.c:1497 do_new_mount fs/namespace.c:2903 [inline] path_mount+0x11b9/0x1c00 fs/namespace.c:3233 do_mount fs/namespace.c:3246 [inline] __do_sys_mount fs/namespace.c:3454 [inline] __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3431 __x64_sys_mount+0x63/0x70 fs/namespace.c:3431 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 6763 Comm: syz-executor.4 Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================