FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
==================================================================
BUG: KCSAN: data-race in _prb_read_valid / data_alloc

write to 0xffffffff86e852e8 of 8 bytes by task 5815 on cpu 1:
 data_alloc+0x2fc/0x380 kernel/printk/printk_ringbuffer.c:1129
 prb_reserve+0x8e3/0xaf0 kernel/printk/printk_ringbuffer.c:1727
 vprintk_store+0x54e/0x910 kernel/printk/printk.c:2354
 vprintk_emit+0x1a4/0x610 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 __nla_validate_parse+0x17ac/0x1d70 lib/nlattr.c:647
 __nla_parse+0x40/0x60 lib/nlattr.c:732
 __nlmsg_parse include/net/netlink.h:789 [inline]
 genl_family_rcv_msg_attrs_parse+0x154/0x1b0 net/netlink/genetlink.c:944
 genl_family_rcv_msg_doit+0x4b/0x1f0 net/netlink/genetlink.c:1092
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x42f/0x470 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x11e/0x220 net/netlink/af_netlink.c:2576
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x665/0x740 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x5ef/0x740 net/netlink/af_netlink.c:1920
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:818 [inline]
 ____sys_sendmsg+0x54a/0x590 net/socket.c:2715
 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2769
 __sys_sendmsg net/socket.c:2801 [inline]
 __do_sys_sendmsg net/socket.c:2806 [inline]
 __se_sys_sendmsg net/socket.c:2804 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2804
 x64_sys_call+0x22ab/0x2550 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86e852e8 of 16 bytes by task 5809 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:496 [inline]
 desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1934 [inline]
 prb_read kernel/printk/printk_ringbuffer.c:1982 [inline]
 _prb_read_valid+0x183/0x930 kernel/printk/printk_ringbuffer.c:2173
 desc_update_last_finalized+0x8f/0x170 kernel/printk/printk_ringbuffer.c:1573
 prb_final_commit+0x111/0x150 kernel/printk/printk_ringbuffer.c:1842
 vprintk_store+0x88f/0x910 kernel/printk/printk.c:2381
 vprintk_emit+0x1a4/0x610 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 fail_dump lib/fault-inject.c:66 [inline]
 should_fail_ex+0x24a/0x280 lib/fault-inject.c:174
 should_failslab+0x8c/0xb0 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4638 [inline]
 slab_alloc_node mm/slub.c:4974 [inline]
 kmem_cache_alloc_noprof+0x5e/0x3d0 mm/slub.c:5010
 lsm_file_alloc security/security.c:172 [inline]
 security_file_alloc+0x32/0xf0 security/security.c:2428
 init_file+0x5b/0x1b0 fs/file_table.c:184
 alloc_empty_file+0x85/0x1e0 fs/file_table.c:266
 alloc_file fs/file_table.c:396 [inline]
 alloc_file_pseudo+0x92/0x120 fs/file_table.c:427
 __anon_inode_getfile fs/anon_inodes.c:164 [inline]
 __anon_inode_getfd fs/anon_inodes.c:281 [inline]
 anon_inode_getfd+0xc1/0x190 fs/anon_inodes.c:305
 fscontext_create_fd fs/fsopen.c:97 [inline]
 __do_sys_fsopen fs/fsopen.c:156 [inline]
 __se_sys_fsopen+0x1e1/0x230 fs/fsopen.c:121
 __x64_sys_fsopen+0x31/0x40 fs/fsopen.c:121
 x64_sys_call+0x1f0f/0x2550 arch/x86/include/generated/asm/syscalls_64.h:431
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5809 Comm: syz.7.8975 Tainted: G                   Y syzkaller #0 PREEMPT(lazy) 
Tainted: [Y]=FORCED_BIND
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
==================================================================
CPU: 0 UID: 0 PID: 5809 Comm: syz.7.8975 Tainted: G                   Y syzkaller #0 PREEMPT(lazy) 
Tainted: [Y]=FORCED_BIND
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
 <TASK>
 __dump_stack+0x1d/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x95/0xd0 lib/dump_stack.c:120
 dump_stack+0x15/0x1b lib/dump_stack.c:129
 fail_dump lib/fault-inject.c:73 [inline]
 should_fail_ex+0x262/0x280 lib/fault-inject.c:174
 should_failslab+0x8c/0xb0 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4638 [inline]
 slab_alloc_node mm/slub.c:4974 [inline]
 kmem_cache_alloc_noprof+0x5e/0x3d0 mm/slub.c:5010
 lsm_file_alloc security/security.c:172 [inline]
 security_file_alloc+0x32/0xf0 security/security.c:2428
 init_file+0x5b/0x1b0 fs/file_table.c:184
 alloc_empty_file+0x85/0x1e0 fs/file_table.c:266
 alloc_file fs/file_table.c:396 [inline]
 alloc_file_pseudo+0x92/0x120 fs/file_table.c:427
 __anon_inode_getfile fs/anon_inodes.c:164 [inline]
 __anon_inode_getfd fs/anon_inodes.c:281 [inline]
 anon_inode_getfd+0xc1/0x190 fs/anon_inodes.c:305
 fscontext_create_fd fs/fsopen.c:97 [inline]
 __do_sys_fsopen fs/fsopen.c:156 [inline]
 __se_sys_fsopen+0x1e1/0x230 fs/fsopen.c:121
 __x64_sys_fsopen+0x31/0x40 fs/fsopen.c:121
 x64_sys_call+0x1f0f/0x2550 arch/x86/include/generated/asm/syscalls_64.h:431
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc246cdf559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc24572f028 EFLAGS: 00000246 ORIG_RAX: 00000000000001ae
RAX: ffffffffffffffda RBX: 00007fc246f65fa0 RCX: 00007fc246cdf559
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007fc246d76b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc246f66038 R14: 00007fc246f65fa0 R15: 00007ffe01df4928
 </TASK>