EXT4-fs (loop0): feature flags set on rev 0 fs, running e2fsck is recommended EXT4-fs (loop0): mounting ext2 file system using the ext4 subsystem ================================================================== BUG: KCSAN: data-race in data_push_tail / string write to 0xffffffff88b89f82 of 1 bytes by task 6183 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 __ext4_warning+0x130/0x140 fs/ext4/super.c:1016 ext4_update_dynamic_rev+0x7b/0xc0 fs/ext4/super.c:1135 ext4_set_feature_large_file fs/ext4/ext4.h:2128 [inline] ext4_do_update_inode fs/ext4/inode.c:5142 [inline] ext4_mark_iloc_dirty+0xba4/0xe10 fs/ext4/inode.c:5751 __ext4_mark_inode_dirty+0x314/0x440 fs/ext4/inode.c:5955 ext4_ext_truncate+0x58/0x150 fs/ext4/extents.c:4457 ext4_truncate+0x776/0xb10 fs/ext4/inode.c:4185 ext4_process_orphan+0x113/0x1c0 fs/ext4/orphan.c:339 ext4_orphan_cleanup+0x696/0x9e0 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5563 [inline] ext4_fill_super+0x36b3/0x3a10 fs/ext4/super.c:5686 get_tree_bdev+0x256/0x2e0 fs/super.c:1635 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5718 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 0xffffffff88b89f80 of 8 bytes by task 6185 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 __ext4_msg+0x18e/0x1a0 fs/ext4/super.c:991 ext4_check_feature_compatibility+0x59d/0x5e0 fs/ext4/super.c:4651 __ext4_fill_super fs/ext4/super.c:5269 [inline] ext4_fill_super+0x20dc/0x3a10 fs/ext4/super.c:5686 get_tree_bdev+0x256/0x2e0 fs/super.c:1635 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5718 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 value changed: 0x00000000ffffe29d -> 0x2933706f6f6c2065 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 6185 Comm: syz.0.887 Not tainted 6.11.0-syzkaller-10622-gaa486552a110 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 ================================================================== EXT4-fs (loop0): warning: checktime reached, running e2fsck is recommended [EXT4 FS bs=4096, gc=1, bpg=32768, ipg=32, mo=a042c01c, mo2=0002] System zones: 0-2 , 18-18 , 34-34 EXT4-fs warning (device loop0): ext4_update_dynamic_rev:1138: updating to rev 1 because of new feature flag, running e2fsck is recommended EXT4-fs (loop0): 1 truncate cleaned up