FAT-fs (loop3): Directory bread(block 69) failed FAT-fs (loop3): Directory bread(block 70) failed FAT-fs (loop3): Directory bread(block 71) failed ================================================================== BUG: KCSAN: data-race in data_push_tail / vsnprintf write to 0xffffffff8413a9a0 of 1 bytes by task 32508 on cpu 0: vsnprintf+0xe8f/0xed0 lib/vsprintf.c:2869 vscnprintf+0x29/0x80 lib/vsprintf.c:2900 printk_sprint kernel/printk/printk.c:2075 [inline] vprintk_store+0x5c2/0xb10 kernel/printk/printk.c:2185 vprintk_emit+0xac/0x380 kernel/printk/printk.c:2228 vprintk_default+0x22/0x30 kernel/printk/printk.c:2255 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50 _printk+0x62/0x87 kernel/printk/printk.c:2265 fat_msg+0x80/0xaf fs/fat/misc.c:56 fat_read_bpb fs/fat/inode.c:1501 [inline] fat_fill_super+0x1f80/0x2a80 fs/fat/inode.c:1656 vfat_fill_super+0x2c/0x40 fs/fat/namei_vfat.c:1051 mount_bdev+0x1e8/0x290 fs/super.c:1368 vfat_mount+0x2d/0x40 fs/fat/namei_vfat.c:1058 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498 do_new_mount fs/namespace.c:2987 [inline] path_mount+0x11ca/0x1d00 fs/namespace.c:3317 do_mount fs/namespace.c:3330 [inline] __do_sys_mount fs/namespace.c:3538 [inline] __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3515 __x64_sys_mount+0x63/0x70 fs/namespace.c:3515 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffffffff8413a9a0 of 8 bytes by task 32493 on cpu 1: data_make_reusable kernel/printk/printk_ringbuffer.c:587 [inline] data_push_tail+0x125/0x460 kernel/printk/printk_ringbuffer.c:672 data_alloc+0xbc/0x2b0 kernel/printk/printk_ringbuffer.c:1043 prb_reserve+0x8f0/0xbc0 kernel/printk/printk_ringbuffer.c:1549 vprintk_store+0x4ef/0xb10 kernel/printk/printk.c:2175 vprintk_emit+0xac/0x380 kernel/printk/printk.c:2228 vprintk_default+0x22/0x30 kernel/printk/printk.c:2255 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50 _printk+0x62/0x87 kernel/printk/printk.c:2265 fat_msg+0x80/0xaf fs/fat/misc.c:56 fat__get_entry fs/fat/dir.c:102 [inline] fat_get_entry+0x540/0x5f0 fs/fat/dir.c:128 fat_get_short_entry fs/fat/dir.c:873 [inline] fat_subdirs+0x10c/0x1b0 fs/fat/dir.c:939 fat_read_root fs/fat/inode.c:1413 [inline] fat_fill_super+0x254c/0x2a80 fs/fat/inode.c:1863 vfat_fill_super+0x2c/0x40 fs/fat/namei_vfat.c:1051 mount_bdev+0x1e8/0x290 fs/super.c:1368 vfat_mount+0x2d/0x40 fs/fat/namei_vfat.c:1058 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498 do_new_mount fs/namespace.c:2987 [inline] path_mount+0x11ca/0x1d00 fs/namespace.c:3317 do_mount fs/namespace.c:3330 [inline] __do_sys_mount fs/namespace.c:3538 [inline] __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3515 __x64_sys_mount+0x63/0x70 fs/namespace.c:3515 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000100000443 -> 0x0000000100000400 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 32493 Comm: syz-executor.3 Tainted: G W 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== FAT-fs (loop3): Directory bread(block 72) failed FAT-fs (loop3): Directory bread(block 73) failed