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Date: Thu, 13 Jun 2024 12:38:26 -0700 From: syzbot <syzbot+e6616d0dc8ded5dc56d6@...kaller.appspotmail.com> To: asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [io-uring?] KMSAN: uninit-value in io_req_cqe_overflow (3) Hello, syzbot found the following issue on: HEAD commit: 614da38e2f7a Merge tag 'hid-for-linus-2024051401' of git:/.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=12980e41980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f5d2cbf33633f507 dashboard link: https://syzkaller.appspot.com/bug?extid=e6616d0dc8ded5dc56d6 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=13526ca2980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=144e5256980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/89eafb874b71/disk-614da38e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/356000512ad9/vmlinux-614da38e.xz kernel image: https://storage.googleapis.com/syzbot-assets/839c73939115/bzImage-614da38e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e6616d0dc8ded5dc56d6@...kaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in io_req_cqe_overflow+0x193/0x1c0 io_uring/io_uring.c:810 io_req_cqe_overflow+0x193/0x1c0 io_uring/io_uring.c:810 __io_submit_flush_completions+0x7eb/0x1be0 io_uring/io_uring.c:1464 io_submit_flush_completions io_uring/io_uring.h:148 [inline] ctx_flush_and_put+0x16c/0x360 io_uring/io_uring.c:1055 io_handle_tw_list+0x58b/0x5c0 io_uring/io_uring.c:1095 tctx_task_work_run+0xf8/0x3d0 io_uring/io_uring.c:1155 tctx_task_work+0x6d/0xc0 io_uring/io_uring.c:1173 task_work_run+0x268/0x310 kernel/task_work.c:180 ptrace_notify+0x304/0x320 kernel/signal.c:2404 ptrace_report_syscall include/linux/ptrace.h:415 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline] syscall_exit_work+0x14e/0x3e0 kernel/entry/common.c:173 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline] syscall_exit_to_user_mode+0x135/0x160 kernel/entry/common.c:218 do_syscall_64+0xdc/0x1e0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: io_req_set_res io_uring/io_uring.h:215 [inline] io_recv_finish+0xf10/0x1560 io_uring/net.c:861 io_recv+0x12ec/0x1ea0 io_uring/net.c:1175 io_issue_sqe+0x429/0x22c0 io_uring/io_uring.c:1751 io_poll_issue+0x32/0x40 io_uring/io_uring.c:1782 io_poll_check_events io_uring/poll.c:331 [inline] io_poll_task_func+0x5f9/0x14d0 io_uring/poll.c:357 io_handle_tw_list+0x23a/0x5c0 io_uring/io_uring.c:1083 tctx_task_work_run+0xf8/0x3d0 io_uring/io_uring.c:1155 tctx_task_work+0x6d/0xc0 io_uring/io_uring.c:1173 task_work_run+0x268/0x310 kernel/task_work.c:180 ptrace_notify+0x304/0x320 kernel/signal.c:2404 ptrace_report_syscall include/linux/ptrace.h:415 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline] syscall_exit_work+0x14e/0x3e0 kernel/entry/common.c:173 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline] syscall_exit_to_user_mode+0x135/0x160 kernel/entry/common.c:218 do_syscall_64+0xdc/0x1e0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:3877 [inline] slab_alloc_node mm/slub.c:3918 [inline] __do_kmalloc_node mm/slub.c:4038 [inline] __kmalloc+0x6e4/0x1060 mm/slub.c:4052 kmalloc include/linux/slab.h:632 [inline] io_alloc_async_data+0xc0/0x220 io_uring/io_uring.c:1662 io_msg_alloc_async io_uring/net.c:166 [inline] io_recvmsg_prep_setup io_uring/net.c:725 [inline] io_recvmsg_prep+0xbe8/0x1a20 io_uring/net.c:806 io_init_req io_uring/io_uring.c:2135 [inline] io_submit_sqe io_uring/io_uring.c:2182 [inline] io_submit_sqes+0x1135/0x2f10 io_uring/io_uring.c:2335 __do_sys_io_uring_enter io_uring/io_uring.c:3246 [inline] __se_sys_io_uring_enter+0x40f/0x3c80 io_uring/io_uring.c:3183 __x64_sys_io_uring_enter+0x11f/0x1a0 io_uring/io_uring.c:3183 x64_sys_call+0x2c0/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:427 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 PID: 5049 Comm: syz-executor107 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 ===================================================== --- 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@...glegroups.com. 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
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