From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f71.google.com (mail-oo1-f71.google.com [209.85.161.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3885531D372 for ; Fri, 13 Feb 2026 12:26:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770985593; cv=none; b=M/cTW7faX7BJz2L5yYo5GRatn7f5kZi1VuzmqHod0g3uW5jM5udkSN7LBafBexd+zoHNQhF3CK6Xufqzc4jNrMhHUuG/7rbwVGnfA4aXQodMv3y5uMylUOH6aBe3WWTHXxSbQh8aICmGRHub3JKRaVLaKKHAyGNsg4H+mUWHWCY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770985593; c=relaxed/simple; bh=cy0+ZHDEAMEKSDszQAmyywslyn+zUHDVdSLBHcrVdNc=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=MjUoIhlSoVnxsNrLnwjVd8nmk2joHafFzznnmv/JRBHkUY/NyyUM2yCwjwicNQuFfqrqn4gMdHFdtg+o3rDs/cof3vBWA/Pl8xM9d/7k2Qb4XRt9dEK+M92gW2Z62CDgNbSv8jDArnoV8pcU4PbHoXjl6TC5wXz1BhKQrW8J3vU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.161.71 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo1-f71.google.com with SMTP id 006d021491bc7-66304fd62ebso6900062eaf.3 for ; Fri, 13 Feb 2026 04:26:31 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770985591; x=1771590391; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=+o9xcW5Jo0mxLv5BBQLNSiDt1MMXbDDyqrVXsz3ZSCI=; b=H3S1ZIgJ2PEAeA38k4XJZkZVEk/I4wSuNJbsAlQBwrg1UI/ASeX2CdBJ0n79r3IDW2 ruFGWgOxlG+44IB+5lzPYzl1FtoPCm9my875MfjofeR2ztScbU+np9J4BpZHiU0ceFJK 16F1nYi6cIFp0rWmjg+rKxODAWRUB05fFKV2NNuUqk+Gp6LVGtPECJz3Obt+xhLea1LO rZqjYHTO7yhsoe1LvrmwEoCd/6ULrYgEeRrZUDc0hH7uLQLEiR+QToAP7Q4Dr83yl5b5 VNi+9VaF1dG7pLDdB9FBui5wbNxqrhURtbMSnC9AJq29ftwTuBL29iLvjJ6w9THVeq7h EV4Q== X-Forwarded-Encrypted: i=1; AJvYcCUP4/eA/OdhIqaTVGltwewr7bFK7fvsQ5hreHKNn2rCuLDb7Vt8TiSbVWndpY8y8OQwWJXK8kPoEwkDaPc=@vger.kernel.org X-Gm-Message-State: AOJu0YzhpdY4Ke68rkSMaSeLMuYmgd5+5Ows3sxR/USV0/Wn2TmMoATi 4OCGvijlAZRsFTWuN5ndGaHXrgVL2aDuHfgENTC7Z6K6Ns40wTkhXR+LezIFPALE4+X3jcJDhsm LUbk4VlDpMJQLMe0XfWCb7JhfjjfXWB0qQyebsQ5/oXkU9DgK9mOML9tY5dY= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:212:b0:676:b0d8:6324 with SMTP id 006d021491bc7-67769e70b8bmr517498eaf.77.1770985591180; Fri, 13 Feb 2026 04:26:31 -0800 (PST) Date: Fri, 13 Feb 2026 04:26:31 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698f1877.a70a0220.2c38d7.00c2.GAE@google.com> Subject: [syzbot] [mm?] KMSAN: uninit-value in follow_page_pte From: syzbot To: akpm@linux-foundation.org, david@kernel.org, jgg@ziepe.ca, jhubbard@nvidia.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, peterx@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 05f7e89ab973 Linux 6.19 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16c324aa580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9682a42d8ec8b05c dashboard link: https://syzkaller.appspot.com/bug?extid=2aee6839a252e612ce34 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b9c0cdc82aa9/disk-05f7e89a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e43670d95943/vmlinux-05f7e89a.xz kernel image: https://storage.googleapis.com/syzbot-assets/2c8401722932/bzImage-05f7e89a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2aee6839a252e612ce34@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in follow_page_pte+0x385/0x15b0 mm/gup.c:816 follow_page_pte+0x385/0x15b0 mm/gup.c:816 follow_pmd_mask mm/gup.c:915 [inline] follow_pud_mask mm/gup.c:967 [inline] follow_p4d_mask mm/gup.c:984 [inline] follow_page_mask mm/gup.c:1023 [inline] __get_user_pages+0x1524/0x5f00 mm/gup.c:1426 __get_user_pages_locked mm/gup.c:1692 [inline] get_dump_page+0x142/0x570 mm/gup.c:2192 dump_user_range+0x26e/0x2230 fs/coredump.c:1366 elf_core_dump+0x697f/0x6c30 fs/binfmt_elf.c:2111 coredump_write+0x209c/0x2d30 fs/coredump.c:1049 do_coredump fs/coredump.c:1126 [inline] vfs_coredump+0x7a08/0x8d90 fs/coredump.c:1200 get_signal+0x2068/0x29d0 kernel/signal.c:3019 arch_do_signal_or_restart+0x53/0xc00 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop kernel/entry/common.c:75 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0xef/0x6d0 kernel/entry/common.c:196 exc_page_fault+0x7e/0xb0 arch/x86/mm/fault.c:1530 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:618 Uninit was stored to memory at: ext4_xattr_set_entry+0x1312/0x3440 fs/ext4/xattr.c:1740 ext4_xattr_block_set+0xc74/0x5040 fs/ext4/xattr.c:2030 ext4_xattr_set_handle+0x1e25/0x2b10 fs/ext4/xattr.c:2457 ext4_xattr_set+0x2ff/0x5a0 fs/ext4/xattr.c:2559 ext4_xattr_trusted_set+0x51/0x70 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x742/0x840 fs/xattr.c:200 __vfs_setxattr_noperm+0x224/0xad0 fs/xattr.c:234 __vfs_setxattr_locked+0x43c/0x480 fs/xattr.c:295 vfs_setxattr+0x28d/0x650 fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] filename_setxattr+0x3a4/0xcc0 fs/xattr.c:665 path_setxattrat+0x6c8/0x7c0 fs/xattr.c:713 __do_sys_lsetxattr fs/xattr.c:754 [inline] __se_sys_lsetxattr fs/xattr.c:750 [inline] __x64_sys_lsetxattr+0x103/0x1c0 fs/xattr.c:750 x64_sys_call+0x3c8b/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:190 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __alloc_frozen_pages_noprof+0x6df/0xf50 mm/page_alloc.c:5263 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2486 alloc_frozen_pages_noprof+0xf6/0x200 mm/mempolicy.c:2557 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x1ea/0x1700 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0x1048/0x38b0 mm/slub.c:4656 __slab_alloc+0xa3/0x180 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] __kmalloc_cache_noprof+0x9e0/0x1710 mm/slub.c:5775 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] sctp_transport_new+0xb2/0xb60 net/sctp/transport.c:95 sctp_assoc_add_peer+0x440/0x22b0 net/sctp/associola.c:617 sctp_process_param net/sctp/sm_make_chunk.c:2546 [inline] sctp_process_init+0x11b0/0x3bc0 net/sctp/sm_make_chunk.c:2366 sctp_cmd_process_init net/sctp/sm_sideeffect.c:712 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1395 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline] sctp_do_sm+0x1719/0x9b30 net/sctp/sm_sideeffect.c:1175 sctp_assoc_bh_rcv+0x88b/0xbc0 net/sctp/associola.c:1034 sctp_inq_push+0x29d/0x350 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x3ca/0xd80 net/sctp/input.c:331 sk_backlog_rcv include/net/sock.h:1177 [inline] __release_sock+0x3fb/0x7d0 net/core/sock.c:3213 release_sock+0x6b/0x260 net/core/sock.c:3795 sctp_wait_for_connect+0x451/0x810 net/sctp/socket.c:9393 __sctp_connect+0x1483/0x15a0 net/sctp/socket.c:1248 __sctp_setsockopt_connectx net/sctp/socket.c:1337 [inline] sctp_getsockopt_connectx3+0x7e5/0x8a0 net/sctp/socket.c:1422 sctp_getsockopt+0xd9b/0x14c0 net/sctp/socket.c:8174 sock_common_getsockopt+0x9c/0xf0 net/core/sock.c:3946 do_sock_getsockopt+0x3a8/0x4c0 net/socket.c:2383 __sys_getsockopt net/socket.c:2412 [inline] __do_sys_getsockopt net/socket.c:2419 [inline] __se_sys_getsockopt net/socket.c:2416 [inline] __x64_sys_getsockopt+0x32d/0x520 net/socket.c:2416 x64_sys_call+0x3a97/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:56 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 9815 Comm: syz.4.1167 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 ===================================================== --- 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@googlegroups.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 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