kauditd_printk_skb: 382 callbacks suppressed ================================================================== BUG: KCSAN: data-race in data_alloc / prb_reserve write to 0xffffffff86867c08 of 8 bytes by task 9696 on cpu 1: data_alloc+0x290/0x2c0 kernel/printk/printk_ringbuffer.c:1096 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 br_set_state+0x295/0x390 net/bridge/br_stp.c:57 br_stp_disable_port+0x5c/0x130 net/bridge/br_stp_if.c:106 del_nbp+0xd3/0x770 net/bridge/br_if.c:343 br_del_if+0x98/0x1e0 net/bridge/br_if.c:739 br_del_slave+0x24/0x30 net/bridge/br_device.c:382 do_set_master+0x246/0x4a0 net/core/rtnetlink.c:2930 do_setlink+0xafe/0x2430 net/core/rtnetlink.c:3159 rtnl_group_changelink net/core/rtnetlink.c:3783 [inline] __rtnl_newlink net/core/rtnetlink.c:3937 [inline] rtnl_newlink+0xd90/0x12d0 net/core/rtnetlink.c:4065 rtnetlink_rcv_msg+0x65a/0x740 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x12f/0x230 net/netlink/af_netlink.c:2534 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6982 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x605/0x6c0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x609/0x720 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:727 ____sys_sendmsg+0x350/0x4e0 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x1a0/0x240 net/socket.c:2652 __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x46/0x50 net/socket.c:2655 x64_sys_call+0x26f3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86867c08 of 8 bytes by task 29 on cpu 0: desc_read kernel/printk/printk_ringbuffer.c:482 [inline] desc_push_tail kernel/printk/printk_ringbuffer.c:778 [inline] desc_reserve kernel/printk/printk_ringbuffer.c:924 [inline] prb_reserve+0x239/0xb80 kernel/printk/printk_ringbuffer.c:1619 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: 0xfffffffffffc0590 -> 0x00000000000589b0 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 29 Comm: kauditd Tainted: G W 6.15.0-rc2-syzkaller-00400-g3088d26962e8 #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ================================================================== audit: type=1326 audit(1745053366.671:9540): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9712 comm="syz.5.2308" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f2a6324e169 code=0x7ffc0000 audit: type=1326 audit(1745053366.671:9541): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9712 comm="syz.5.2308" exe="/root/syz-executor" sig=0 arch=c000003e syscall=41 compat=0 ip=0x7f2a6324e169 code=0x7ffc0000 audit: type=1326 audit(1745053366.671:9542): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9712 comm="syz.5.2308" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f2a6324e169 code=0x7ffc0000 audit: type=1326 audit(1745053366.671:9543): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9712 comm="syz.5.2308" exe="/root/syz-executor" sig=0 arch=c000003e syscall=46 compat=0 ip=0x7f2a6324e169 code=0x7ffc0000 audit: type=1326 audit(1745053367.161:9544): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9712 comm="syz.5.2308" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f2a6324e169 code=0x7ffc0000 audit: type=1326 audit(1745053367.161:9545): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9712 comm="syz.5.2308" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f2a6324e169 code=0x7ffc0000