Hello, syzbot found the following issue on: HEAD commit: 80e54e84911a Linux 6.14-rc6 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1664a7a8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=958433697845b9a6 dashboard link: https://syzkaller.appspot.com/bug?extid=f2aaf773187f5cae54f3 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e94728c052e3/disk-80e54e84.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/742f05e27746/vmlinux-80e54e84.xz kernel image: https://storage.googleapis.com/syzbot-assets/90d418e775f7/bzImage-80e54e84.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f2aaf773187f5cae54f3@xxxxxxxxxxxxxxxxxxxxxxxxx EXT4-fs (loop0): unmounting filesystem 00000000-0000-0000-0000-000000000000. ================================================================== BUG: KCSAN: data-race in __filemap_add_folio / invalidate_bdev read-write to 0xffff888100630570 of 8 bytes by task 3291 on cpu 0: __filemap_add_folio+0x430/0x6f0 mm/filemap.c:929 filemap_add_folio+0x9c/0x1b0 mm/filemap.c:981 page_cache_ra_unbounded+0x1c1/0x350 mm/readahead.c:276 do_page_cache_ra mm/readahead.c:328 [inline] force_page_cache_ra mm/readahead.c:357 [inline] page_cache_sync_ra+0x252/0x680 mm/readahead.c:585 filemap_get_pages+0x2ca/0x11a0 mm/filemap.c:2580 filemap_read+0x230/0x8c0 mm/filemap.c:2691 blkdev_read_iter+0x228/0x2d0 block/fops.c:796 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x5cc/0x6f0 fs/read_write.c:565 ksys_read+0xe8/0x1b0 fs/read_write.c:708 __do_sys_read fs/read_write.c:717 [inline] __se_sys_read fs/read_write.c:715 [inline] __x64_sys_read+0x42/0x50 fs/read_write.c:715 x64_sys_call+0x2874/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:1 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 0xffff888100630570 of 8 bytes by task 3306 on cpu 1: invalidate_bdev+0x25/0x70 block/bdev.c:99 ext4_put_super+0x571/0x810 fs/ext4/super.c:1356 generic_shutdown_super+0xe5/0x220 fs/super.c:642 kill_block_super+0x2a/0x70 fs/super.c:1710 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7368 deactivate_locked_super+0x7d/0x1c0 fs/super.c:473 deactivate_super+0x9f/0xb0 fs/super.c:506 cleanup_mnt+0x268/0x2e0 fs/namespace.c:1413 __cleanup_mnt+0x19/0x20 fs/namespace.c:1420 task_work_run+0x13a/0x1a0 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xa8/0x120 kernel/entry/common.c:218 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x000000000000000d -> 0x000000000000000e Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 3306 Comm: syz-executor Not tainted 6.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
