On 3/2/25 3:14 AM, syzbot wrote:
Hello, syzbot found the following issue on: HEAD commit: b4b0881156fb Merge tag 'docs-6.14-2' of git://git.lwn.net/.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=146c5ddf980000 kernel config: https://syzkaller.appspot.com/x/.config?x=7d0bb5e08cf54aa2 dashboard link: https://syzkaller.appspot.com/bug?extid=a84ce0b8e1f3da037bf7 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10cb8518580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=122a0b24580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4dbe3cd3dcb8/disk-b4b08811.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/592d90859f86/vmlinux-b4b08811.xz kernel image: https://storage.googleapis.com/syzbot-assets/4cfde2b63c7f/bzImage-b4b08811.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a84ce0b8e1f3da037bf7@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in full_proxy_poll+0xdf/0x3b0 fs/debugfs/file.c:411 full_proxy_poll+0xdf/0x3b0 fs/debugfs/file.c:411 vfs_poll include/linux/poll.h:82 [inline] ep_item_poll fs/eventpoll.c:1060 [inline] ep_insert+0x19c7/0x2740 fs/eventpoll.c:1736 do_epoll_ctl+0xd83/0x17f0 fs/eventpoll.c:2394 __do_sys_epoll_ctl fs/eventpoll.c:2445 [inline] __se_sys_epoll_ctl fs/eventpoll.c:2436 [inline] __x64_sys_epoll_ctl+0x1b5/0x210 fs/eventpoll.c:2436 x64_sys_call+0x1658/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:234 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: __debugfs_file_get+0xe86/0xef0 fs/debugfs/file.c:122 full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447 do_dentry_open+0x1bdd/0x26b0 fs/open.c:955 vfs_open+0x53/0x5b0 fs/open.c:1085 do_open fs/namei.c:3830 [inline] path_openat+0x56a1/0x6250 fs/namei.c:3989 do_filp_open+0x268/0x600 fs/namei.c:4016 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427 do_sys_open fs/open.c:1442 [inline] __do_sys_openat fs/open.c:1458 [inline] __se_sys_openat fs/open.c:1453 [inline] __x64_sys_openat+0x2a1/0x310 fs/open.c:1453 x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: __debugfs_file_get+0xe59/0xef0 fs/debugfs/file.c:120 full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447 do_dentry_open+0x1bdd/0x26b0 fs/open.c:955 vfs_open+0x53/0x5b0 fs/open.c:1085 do_open fs/namei.c:3830 [inline] path_openat+0x56a1/0x6250 fs/namei.c:3989 do_filp_open+0x268/0x600 fs/namei.c:4016 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427 do_sys_open fs/open.c:1442 [inline] __do_sys_openat fs/open.c:1458 [inline] __se_sys_openat fs/open.c:1453 [inline] __x64_sys_openat+0x2a1/0x310 fs/open.c:1453 x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: __debugfs_file_get+0xdff/0xef0 fs/debugfs/file.c:118 full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447 do_dentry_open+0x1bdd/0x26b0 fs/open.c:955 vfs_open+0x53/0x5b0 fs/open.c:1085 do_open fs/namei.c:3830 [inline] path_openat+0x56a1/0x6250 fs/namei.c:3989 do_filp_open+0x268/0x600 fs/namei.c:4016 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427 do_sys_open fs/open.c:1442 [inline] __do_sys_openat fs/open.c:1458 [inline] __se_sys_openat fs/open.c:1453 [inline] __x64_sys_openat+0x2a1/0x310 fs/open.c:1453 x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4121 [inline] slab_alloc_node mm/slub.c:4164 [inline] __kmalloc_cache_noprof+0x8e3/0xdf0 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [inline] __debugfs_file_get+0x31d/0xef0 fs/debugfs/file.c:101 full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447 do_dentry_open+0x1bdd/0x26b0 fs/open.c:955 vfs_open+0x53/0x5b0 fs/open.c:1085 do_open fs/namei.c:3830 [inline] path_openat+0x56a1/0x6250 fs/namei.c:3989 do_filp_open+0x268/0x600 fs/namei.c:4016 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427 do_sys_open fs/open.c:1442 [inline] __do_sys_openat fs/open.c:1458 [inline] __se_sys_openat fs/open.c:1453 [inline] __x64_sys_openat+0x2a1/0x310 fs/open.c:1453 x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 5778 Comm: syz-executor303 Not tainted 6.13.0-syzkaller-09585-gb4b0881156fb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 ===================================================== --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
|#syz test: |git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git|57b314752ec0ad42685bc78b376326f1f4c04669|
