EXT4-fs error (device loop3): ext4_do_update_inode:5653: inode #16: comm syz.3.5582: corrupted inode contents EXT4-fs error (device loop3): __ext4_ext_dirty:206: inode #16: comm syz.3.5582: mark_inode_dirty error ================================================================== BUG: KCSAN: data-race in console_flush_all / console_flush_all write to 0xffffffff86a20b48 of 8 bytes by task 18420 on cpu 0: console_emit_next_record kernel/printk/printk.c:3099 [inline] console_flush_all+0x35a/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 chnl_net_open+0x2a9/0x560 net/caif/chnl_net.c:260 __dev_open+0x2d2/0x530 net/core/dev.c:1682 __dev_change_flags+0x163/0x400 net/core/dev.c:9537 netif_change_flags+0x5a/0xd0 net/core/dev.c:9600 do_setlink+0x9d2/0x2810 net/core/rtnetlink.c:3143 rtnl_group_changelink net/core/rtnetlink.c:3775 [inline] __rtnl_newlink net/core/rtnetlink.c:3929 [inline] rtnl_newlink+0xd8b/0x12d0 net/core/rtnetlink.c:4057 rtnetlink_rcv_msg+0x5fe/0x6d0 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2552 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6973 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5bd/0x690 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x142/0x180 net/socket.c:729 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2614 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2703 x64_sys_call+0x191e/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:47 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 0xffffffff86a20b48 of 8 bytes by task 18413 on cpu 1: console_flush_all+0x563/0x730 kernel/printk/printk.c:3227 __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 __ext4_error_inode+0x2ca/0x3f0 fs/ext4/super.c:844 __ext4_mark_inode_dirty+0xbd/0x3f0 fs/ext4/inode.c:6512 __ext4_ext_dirty+0xdb/0x1f0 fs/ext4/extents.c:206 ext4_ext_rm_leaf fs/ext4/extents.c:2752 [inline] ext4_ext_remove_space+0x135b/0x2900 fs/ext4/extents.c:2965 ext4_ext_truncate+0xc7/0x170 fs/ext4/extents.c:4484 ext4_truncate+0x708/0xad0 fs/ext4/inode.c:4643 ext4_process_orphan+0x110/0x1c0 fs/ext4/orphan.c:339 ext4_orphan_cleanup+0x6a8/0xa00 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5605 [inline] ext4_fill_super+0x3171/0x34e0 fs/ext4/super.c:5724 get_tree_bdev_flags+0x28e/0x300 fs/super.c:1692 get_tree_bdev+0x1f/0x30 fs/super.c:1715 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5756 vfs_get_tree+0x57/0x1d0 fs/super.c:1815 do_new_mount+0x207/0x5e0 fs/namespace.c:3805 path_mount+0x4a4/0xb20 fs/namespace.c:4120 do_mount fs/namespace.c:4133 [inline] __do_sys_mount fs/namespace.c:4344 [inline] __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4321 __x64_sys_mount+0x67/0x80 fs/namespace.c:4321 x64_sys_call+0x2b4d/0x2ff0 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 value changed: 0x00000000000034b5 -> 0x00000000000034b6 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 18413 Comm: syz.3.5582 Not tainted 6.17.0-rc1-syzkaller-00199-gdfd4b508c8c6 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 ================================================================== EXT4-fs error (device loop3): ext4_do_update_inode:5653: inode #16: comm syz.3.5582: corrupted inode contents EXT4-fs error (device loop3) in ext4_orphan_del:305: Corrupt filesystem EXT4-fs error (device loop3): ext4_do_update_inode:5653: inode #16: comm syz.3.5582: corrupted inode contents EXT4-fs error (device loop3): ext4_truncate:4666: inode #16: comm syz.3.5582: mark_inode_dirty error EXT4-fs error (device loop3) in ext4_process_orphan:347: Corrupt filesystem EXT4-fs (loop3): 1 truncate cleaned up EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /568/file0 supports timestamps until 2038-01-19 (0x7fffffff)