EXT4-fs (loop8): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /27/bus supports timestamps until 2038-01-19 (0x7fffffff) ================================================================== BUG: KCSAN: data-race in data_push_tail / string write to 0xffffffff88bc79e0 of 1 bytes by task 13030 on cpu 1: string_nocheck lib/vsprintf.c:650 [inline] string+0x16c/0x210 lib/vsprintf.c:728 vsnprintf+0xa09/0xe30 lib/vsprintf.c:2803 vscnprintf+0x42/0x90 lib/vsprintf.c:2909 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2197 vprintk_store+0x570/0x810 kernel/printk/printk.c:2311 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2383 vprintk_default+0x26/0x30 kernel/printk/printk.c:2422 vprintk+0x75/0x80 kernel/printk/printk_safe.c:68 _printk+0x7a/0xa0 kernel/printk/printk.c:2432 __nla_validate_parse+0x1881/0x1e30 lib/nlattr.c:647 __nla_parse+0x40/0x60 lib/nlattr.c:732 nla_parse_nested_deprecated include/net/netlink.h:1339 [inline] __rtnl_newlink net/core/rtnetlink.c:3659 [inline] rtnl_newlink+0x564/0x1690 net/core/rtnetlink.c:3772 rtnetlink_rcv_msg+0x6aa/0x710 net/core/rtnetlink.c:6675 netlink_rcv_skb+0x12c/0x230 net/netlink/af_netlink.c:2536 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6693 netlink_unicast_kernel net/netlink/af_netlink.c:1316 [inline] netlink_unicast+0x599/0x670 net/netlink/af_netlink.c:1342 netlink_sendmsg+0x5cc/0x6e0 net/netlink/af_netlink.c:1886 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:744 ____sys_sendmsg+0x312/0x410 net/socket.c:2607 ___sys_sendmsg net/socket.c:2661 [inline] __sys_sendmsg+0x1d9/0x270 net/socket.c:2690 __do_sys_sendmsg net/socket.c:2699 [inline] __se_sys_sendmsg net/socket.c:2697 [inline] __x64_sys_sendmsg+0x46/0x50 net/socket.c:2697 x64_sys_call+0x2689/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:47 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 read to 0xffffffff88bc79e0 of 8 bytes by task 13039 on cpu 0: data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline] data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:679 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1054 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669 vprintk_store+0x53f/0x810 kernel/printk/printk.c:2301 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2383 vprintk_default+0x26/0x30 kernel/printk/printk.c:2422 vprintk+0x75/0x80 kernel/printk/printk_safe.c:68 _printk+0x7a/0xa0 kernel/printk/printk.c:2432 mnt_warn_timestamp_expiry+0x1cd/0x210 fs/namespace.c:2961 do_new_mount_fc fs/namespace.c:3442 [inline] do_new_mount+0x316/0x690 fs/namespace.c:3509 path_mount+0x49b/0xb30 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x27c/0x2d0 fs/namespace.c:4034 __x64_sys_mount+0x67/0x80 fs/namespace.c:4034 x64_sys_call+0x203e/0x2d60 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: 0x00000000fffff8a3 -> 0x000a2e272e273337 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 13039 Comm: syz.8.2475 Not tainted 6.12.0-syzkaller-00171-g23acd177540d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 ================================================================== EXT4-fs (loop8): unmounting filesystem 00000000-0000-0000-0000-000000000000.