loop5: detected capacity change from 0 to 128 msdos: Unknown parameter '' ================================================================== BUG: KCSAN: data-race in _prb_read_valid / data_alloc write to 0xffffffff8686ba48 of 8 bytes by task 5351 on cpu 1: data_alloc+0x271/0x2b0 kernel/printk/printk_ringbuffer.c:1095 prb_reserve+0x808/0xaf0 kernel/printk/printk_ringbuffer.c:1669 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 sidtab_context_to_sid+0x5bf/0x5e0 security/selinux/ss/sidtab.c:348 security_context_to_sid_core+0x294/0x3b0 security/selinux/ss/services.c:1588 security_context_to_sid_force+0x30/0x40 security/selinux/ss/services.c:1661 selinux_inode_setxattr+0x4e8/0x6e0 security/selinux/hooks.c:3372 security_inode_setxattr+0x13a/0x1b0 security/security.c:2422 __vfs_setxattr_locked+0x83/0x1d0 fs/xattr.c:286 vfs_setxattr+0x132/0x270 fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] filename_setxattr+0x1ad/0x400 fs/xattr.c:665 path_setxattrat+0x2c9/0x310 fs/xattr.c:713 __do_sys_lsetxattr fs/xattr.c:754 [inline] __se_sys_lsetxattr fs/xattr.c:750 [inline] __x64_sys_lsetxattr+0x71/0x90 fs/xattr.c:750 x64_sys_call+0x1e36/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:190 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 0xffffffff8686ba48 of 16 bytes by task 5346 on cpu 0: desc_read kernel/printk/printk_ringbuffer.c:482 [inline] desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1874 [inline] prb_read kernel/printk/printk_ringbuffer.c:1922 [inline] _prb_read_valid+0x1bc/0x920 kernel/printk/printk_ringbuffer.c:2113 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 do_con_write+0x28d7/0x2940 drivers/tty/vt/vt.c:-1 con_write+0x24/0x40 drivers/tty/vt/vt.c:3516 process_output_block drivers/tty/n_tty.c:561 [inline] n_tty_write+0x7d8/0xb10 drivers/tty/n_tty.c:2377 iterate_tty_write drivers/tty/tty_io.c:1006 [inline] file_tty_write+0x38c/0x670 drivers/tty/tty_io.c:1081 tty_write+0x25/0x30 drivers/tty/tty_io.c:1102 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x4a0/0x8e0 fs/read_write.c:686 ksys_write+0xda/0x1a0 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __x64_sys_write+0x40/0x50 fs/read_write.c:746 x64_sys_call+0x2cdd/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:2 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 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 5346 Comm: syz.5.8966 Tainted: G W 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ==================================================================