================================================================== BUG: KCSAN: data-race in data_push_tail / string write to 0xffffffff88b9faa2 of 1 bytes by task 15877 on cpu 0: 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 _fat_msg+0xa2/0xd0 fs/fat/misc.c:62 fat__get_entry fs/fat/dir.c:102 [inline] fat_get_entry+0x542/0x5f0 fs/fat/dir.c:128 fat_get_short_entry fs/fat/dir.c:885 [inline] fat_subdirs+0xfa/0x190 fs/fat/dir.c:951 fat_read_root+0x2d3/0x310 fs/fat/inode.c:1345 fat_fill_super+0x14f5/0x1bf0 fs/fat/inode.c:1814 vfat_fill_super+0x24/0x30 fs/fat/namei_vfat.c:1200 get_tree_bdev+0x256/0x2e0 fs/super.c:1635 vfat_get_tree+0x1c/0x30 fs/fat/namei_vfat.c:1205 vfs_get_tree+0x56/0x1e0 fs/super.c:1800 do_new_mount+0x227/0x690 fs/namespace.c:3507 path_mount+0x49b/0xb30 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x27c/0x2d0 fs/namespace.c:4032 __x64_sys_mount+0x67/0x80 fs/namespace.c:4032 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 read to 0xffffffff88b9faa0 of 8 bytes by task 15791 on cpu 1: 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 batadv_check_known_mac_addr+0x153/0x180 net/batman-adv/hard-interface.c:528 batadv_hard_if_event+0x4b0/0x1010 net/batman-adv/hard-interface.c:998 notifier_call_chain kernel/notifier.c:93 [inline] raw_notifier_call_chain+0x6f/0x1d0 kernel/notifier.c:461 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] dev_set_mac_address+0x1ff/0x260 net/core/dev.c:9104 dev_set_mac_address_user+0x31/0x50 net/core/dev.c:9118 do_setlink+0x513/0x2490 net/core/rtnetlink.c:2884 __rtnl_newlink net/core/rtnetlink.c:3725 [inline] rtnl_newlink+0x11a3/0x1690 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:2551 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6693 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x599/0x670 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x5cc/0x6e0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:744 __sys_sendto+0x1d6/0x260 net/socket.c:2214 __do_sys_sendto net/socket.c:2226 [inline] __se_sys_sendto net/socket.c:2222 [inline] __x64_sys_sendto+0x78/0x90 net/socket.c:2222 x64_sys_call+0x2959/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:45 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: 0x00000000fffffbc0 -> 0x2932706f6f6c2820 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 15791 Comm: syz-executor Not tainted 6.12.0-rc3-syzkaller-00319-gb04ae0f45168 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ================================================================== batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: batadv0: Interface activated: batadv_slave_0 syz-executor (15791) used greatest stack depth: 9328 bytes left