Hello, syzbot found the following issue on: HEAD commit: baeb9a7d8b60 Merge tag 'sched-rt-2024-09-17' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16080700580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3b3c9c7ae5fde27e dashboard link: https://syzkaller.appspot.com/bug?extid=3b6b32dc50537a49bb4a 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/b0581f8f76ee/disk-baeb9a7d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/742809660d16/vmlinux-baeb9a7d.xz kernel image: https://storage.googleapis.com/syzbot-assets/628c7d467d97/bzImage-baeb9a7d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3b6b32dc50537a49bb4a@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in __ep_remove / __fput write to 0xffff888117ce4690 of 8 bytes by task 3797 on cpu 1: __ep_remove+0x3c8/0x450 fs/eventpoll.c:826 ep_remove_safe fs/eventpoll.c:864 [inline] ep_clear_and_put+0x158/0x260 fs/eventpoll.c:900 ep_eventpoll_release+0x2c/0x40 fs/eventpoll.c:937 __fput+0x17a/0x6d0 fs/file_table.c:431 ____fput+0x1c/0x30 fs/file_table.c:459 task_work_run+0x13a/0x1a0 kernel/task_work.c:228 get_signal+0xf87/0x1100 kernel/signal.c:2690 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x59/0x130 kernel/entry/common.c:218 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888117ce4690 of 8 bytes by task 3795 on cpu 0: eventpoll_release include/linux/eventpoll.h:45 [inline] __fput+0xee/0x6d0 fs/file_table.c:422 ____fput+0x1c/0x30 fs/file_table.c:459 task_work_run+0x13a/0x1a0 kernel/task_work.c:228 get_signal+0xf87/0x1100 kernel/signal.c:2690 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x59/0x130 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: 0xffff888103209140 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3795 Comm: syz.3.142 Not tainted 6.11.0-syzkaller-07341-gbaeb9a7d8b60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 ================================================================== --- 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
