audit: type=1400 audit(2000000034.200:3120): avc: denied { mounton } for pid=7754 comm="syz.5.1486" path="/171/file0" dev="tmpfs" ino=912 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_tmpfs_t tclass=blk_file permissive=1 audit: type=1400 audit(2000000034.200:3121): avc: denied { ioctl } for pid=7752 comm="syz.1.1485" path="socket:[18615]" dev="sockfs" ino=18615 ioctlcmd=0x8933 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_xfrm_socket permissive=1 ================================================================== BUG: KCSAN: data-race in data_push_tail / number write to 0xffffffff88e4ab9f of 1 bytes by task 7757 on cpu 1: number+0x7f2/0xac0 lib/vsprintf.c:558 vsnprintf+0x6b0/0x8a0 lib/vsprintf.c:2811 vscnprintf+0x42/0x90 lib/vsprintf.c:2912 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2216 vprintk_store+0x583/0x860 kernel/printk/printk.c:2336 vprintk_emit+0x1a0/0x6c0 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x7f/0xb0 kernel/printk/printk.c:2475 set_capacity_and_notify+0x155/0x200 block/genhd.c:93 loop_set_size+0x2e/0x70 drivers/block/loop.c:210 loop_configure+0x89c/0xa30 drivers/block/loop.c:1120 lo_ioctl+0x5fa/0x1570 drivers/block/loop.c:-1 blkdev_ioctl+0x35b/0x450 block/ioctl.c:698 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xc9/0x140 fs/ioctl.c:892 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:892 x64_sys_call+0x168d/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff88e4ab98 of 8 bytes by task 29 on cpu 0: data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline] data_push_tail+0x107/0x440 kernel/printk/printk_ringbuffer.c:679 data_alloc+0xbd/0x2c0 kernel/printk/printk_ringbuffer.c:1054 prb_reserve+0x86a/0xb80 kernel/printk/printk_ringbuffer.c:1669 vprintk_store+0x552/0x860 kernel/printk/printk.c:2326 vprintk_emit+0x1a0/0x6c0 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x7f/0xb0 kernel/printk/printk.c:2475 kauditd_printk_skb kernel/audit.c:546 [inline] kauditd_hold_skb+0x1a3/0x1b0 kernel/audit.c:581 kauditd_send_queue+0x288/0x2e0 kernel/audit.c:766 kauditd_thread+0x432/0x640 kernel/audit.c:890 kthread+0x4b7/0x540 kernel/kthread.c:464 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 value changed: 0x00000000ffffe5b5 -> 0x742030206d6f7266 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 29 Comm: kauditd Tainted: G W 6.14.0-syzkaller-11270-g08733088b566 #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ==================================================================