Node 0 DMA free:15360kB boost:0kB min:20kB low:32kB high:44kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 2882 7860 ================================================================== BUG: KCSAN: data-race in _prb_read_valid / prb_reserve write to 0xffffffff868ed300 of 88 bytes by task 30387 on cpu 0: prb_reserve+0x696/0xaf0 kernel/printk/printk_ringbuffer.c:1635 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2475 mnt_warn_timestamp_expiry+0x1c3/0x200 fs/namespace.c:3300 do_new_mount_fc fs/namespace.c:3837 [inline] do_new_mount+0x2f6/0x680 fs/namespace.c:3904 path_mount+0x4a4/0xb20 fs/namespace.c:4226 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4427 __x64_sys_mount+0x67/0x80 fs/namespace.c:4427 x64_sys_call+0xd36/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff868ed300 of 8 bytes by task 30385 on cpu 1: desc_read kernel/printk/printk_ringbuffer.c:486 [inline] prb_first_seq kernel/printk/printk_ringbuffer.c:1957 [inline] _prb_read_valid+0x383/0x920 kernel/printk/printk_ringbuffer.c:2114 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2185 printk_get_next_message+0xc8/0x510 kernel/printk/printk.c:3005 console_emit_next_record kernel/printk/printk.c:3092 [inline] console_flush_all+0x290/0x730 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xa1/0x330 kernel/printk/printk.c:3325 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2475 show_free_areas mm/show_mem.c:346 [inline] __show_mem+0xd8b/0x14b0 mm/show_mem.c:403 warn_alloc_show_mem mm/page_alloc.c:3719 [inline] warn_alloc+0x189/0x1a0 mm/page_alloc.c:3744 __vmalloc_node_range_noprof+0x9c/0xe00 mm/vmalloc.c:3822 vmalloc_user_noprof+0x7d/0xb0 mm/vmalloc.c:4038 xskq_create+0x80/0xe0 net/xdp/xsk_queue.c:49 xsk_init_queue+0x95/0xf0 net/xdp/xsk.c:1022 xsk_setsockopt+0x35c/0x510 net/xdp/xsk.c:1436 do_sock_setsockopt net/socket.c:2296 [inline] __sys_setsockopt+0x181/0x200 net/socket.c:2321 __do_sys_setsockopt net/socket.c:2327 [inline] __se_sys_setsockopt net/socket.c:2324 [inline] __x64_sys_setsockopt+0x64/0x80 net/socket.c:2324 x64_sys_call+0x2bd5/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:55 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000002f44 -> 0x0000000000004f44 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 30385 Comm: syz.6.18683 Not tainted 6.16.0-rc3-syzkaller-00072-gee88bddf7f2f #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ================================================================== 7860 Node 0 DMA32 free:2947832kB boost:0kB min:4132kB low:7060kB high:9988kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129332kB managed:2951360kB mlocked:0kB bounce:0kB free_pcp:3528kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 0 4978 4978 Node 0 Normal free:4241232kB boost:0kB min:7188kB low:12284kB high:17380kB reserved_highatomic:0KB free_highatomic:0KB active_anon:222580kB inactive_anon:96kB active_file:33076kB inactive_file:87576kB unevictable:76844kB writepending:1948kB present:5242880kB managed:5098240kB mlocked:0kB bounce:0kB free_pcp:55864kB local_pcp:16316kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15360kB Node 0 DMA32: 4*4kB (M) 3*8kB (M) 5*16kB (M) 2*32kB (M) 5*64kB (M) 4*128kB (M) 3*256kB (M) 4*512kB (M) 3*1024kB (M) 2*2048kB (M) 717*4096kB (M) = 2947832kB Node 0 Normal: 370*4kB (UE) 88*8kB (UE) 575*16kB (U) 285*32kB (U) 14*64kB (UE) 209*128kB (UE) 86*256kB (UE) 56*512kB (UME) 65*1024kB (UE) 24*2048kB (UM) 983*4096kB (UM) = 4240920kB Node 0 hugepages_total=4 hugepages_free=4 hugepages_surp=0 hugepages_size=2048kB 91625 total pagecache pages 67 pages in swap cache Free swap = 124728kB Total swap = 124996kB 2097051 pages RAM 0 pages HighMem/MovableOnly 80811 pages reserved