From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-181.mta1.migadu.com (out-181.mta1.migadu.com [95.215.58.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 46E6417E0 for ; Mon, 6 Jan 2025 03:37:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.181 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736134639; cv=none; b=ZHEznVyKwUeKgW+cvH46+3vWsfg3TX7ufDQ3J5aFqRr8sePn0+SieHnALD1QvYzFIpCjxCvQaZJeyA94U5rEKIRMa5lFwNV0UPNXbRFyqBigraXFRNUL4wnLj6DaT4thg6VXh62pYOrsyIST2PE6uNrxCYO53TJFTY2R6v3eR5w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736134639; c=relaxed/simple; bh=QE4DgyVP7LbMBsC/iKTWO/Kqx1OXvaLaoT0JrqGq3vU=; h=Content-Type:Mime-Version:Subject:From:In-Reply-To:Date:Cc: Message-Id:References:To; b=agszRdQMnzBrXSANMco9YUXdhKL5rM0VuffTemOcMbRmeh3bdz1HfRiEENY9y1oYC4gGq+rL8LDjLt7onxsBn8kq61YoFNhmIgae5KpFpHBoPVtkY1blqaSGcKqVOpRcVmldwwqGPVuXQy8PxlgpxmWWfnp8EJIsU9yQVkF0DLE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=FhiZM9R2; arc=none smtp.client-ip=95.215.58.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="FhiZM9R2" Content-Type: text/plain; charset=us-ascii DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1736134634; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PQpBofpQnl0SC7Bi5dor0VL3rQqnVvyzbkJ0KQ2jWQ4=; b=FhiZM9R2YuM3C+GbYHcaAwXUTSYoOs7oD/vvjSR6/ms95MfNnvW4yH7dw0LQ2wnSYHA24L GmZxqwDN2ENIdADu77GDxBkmqeyXEU01KA4xO3ZHENJHErRnrB5MttWLTv2V+0s4r2b0jU GJ8r6dELPbWi6aPs/jf/pw/9d16JIgQ= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3826.200.121\)) Subject: Re: [syzbot] [mm?] kernel BUG in alloc_hugetlb_folio_reserve X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Muchun Song In-Reply-To: <677928b5.050a0220.3b53b0.004d.GAE@google.com> Date: Mon, 6 Jan 2025 11:36:36 +0800 Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, syzbot Content-Transfer-Encoding: quoted-printable Message-Id: <61EACBD1-8619-4142-8F29-ED3E5A5DC56F@linux.dev> References: <677928b5.050a0220.3b53b0.004d.GAE@google.com> To: Steve Sistare X-Migadu-Flow: FLOW_OUT > On Jan 4, 2025, at 20:25, syzbot = wrote: >=20 > Hello, >=20 > syzbot found the following issue on: >=20 > HEAD commit: 63676eefb7a0 Merge tag 'sched_ext-for-6.13-rc5-fixes' = of g.. > git tree: upstream > console output: = https://syzkaller.appspot.com/x/log.txt?x=3D15fb66f8580000 > kernel config: = https://syzkaller.appspot.com/x/.config?x=3D1c541fa8af5c9cc7 > dashboard link: = https://syzkaller.appspot.com/bug?extid=3Da504cb5bae4fe117ba94 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for = Debian) 2.40 >=20 > Unfortunately, I don't have any reproducer for this issue yet. >=20 > Downloadable assets: > disk image (non-bootable): = https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_dis= k-63676eef.raw.xz > vmlinux: = https://storage.googleapis.com/syzbot-assets/599e1a07ba5c/vmlinux-63676eef= .xz > kernel image: = https://storage.googleapis.com/syzbot-assets/b52f3534bdbe/bzImage-63676eef= .xz >=20 > IMPORTANT: if you fix the issue, please add the following tag to the = commit: > Reported-by: syzbot+a504cb5bae4fe117ba94@syzkaller.appspotmail.com >=20 > ------------[ cut here ]------------ > kernel BUG at mm/hugetlb.c:2403! It is an assertion VM_BUG_ON(!h->resv_huge_pages) in = alloc_hugetlb_folio_reserve(). Cc Steve, the author of adding this assertion. Maybe you have some = thoughts on this. Muchun, Thanks. > Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI > CPU: 0 UID: 0 PID: 5315 Comm: syz.0.0 Not tainted = 6.13.0-rc5-syzkaller-00161-g63676eefb7a0 #0 > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS = 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 > RIP: 0010:alloc_hugetlb_folio_reserve+0xbc/0xc0 mm/hugetlb.c:2403 > Code: 1f eb 05 e8 56 18 a0 ff 48 c7 c7 40 56 61 8e e8 ba 21 cc 09 4c = 89 f0 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc e8 35 18 a0 ff 90 <0f> 0b = 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f > RSP: 0018:ffffc9000d3d77f8 EFLAGS: 00010087 > RAX: ffffffff81ff6beb RBX: 0000000000000000 RCX: 0000000000100000 > RDX: ffffc9000e51a000 RSI: 00000000000003ec RDI: 00000000000003ed > RBP: 1ffffffff34810d9 R08: ffffffff81ff6ba3 R09: 1ffffd4000093005 > R10: dffffc0000000000 R11: fffff94000093006 R12: dffffc0000000000 > R13: dffffc0000000000 R14: ffffea0000498000 R15: ffffffff9a4086c8 > FS: 00007f77ac12e6c0(0000) GS:ffff88801fc00000(0000) = knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f77ab54b170 CR3: 0000000040b70000 CR4: 0000000000352ef0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > memfd_alloc_folio+0x1bd/0x370 mm/memfd.c:88 > memfd_pin_folios+0xf10/0x1570 mm/gup.c:3750 > udmabuf_pin_folios drivers/dma-buf/udmabuf.c:346 [inline] > udmabuf_create+0x70e/0x10c0 drivers/dma-buf/udmabuf.c:443 > udmabuf_ioctl_create drivers/dma-buf/udmabuf.c:495 [inline] > udmabuf_ioctl+0x301/0x4e0 drivers/dma-buf/udmabuf.c:526 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:906 [inline] > __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f77ab385d29 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 = 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d = 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f77ac12e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007f77ab575fa0 RCX: 00007f77ab385d29 > RDX: 0000000020000040 RSI: 0000000040187542 RDI: 0000000000000006 > RBP: 00007f77ab401b08 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 0000000000000000 R14: 00007f77ab575fa0 R15: 00007fff748b7238 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:alloc_hugetlb_folio_reserve+0xbc/0xc0 mm/hugetlb.c:2403 > Code: 1f eb 05 e8 56 18 a0 ff 48 c7 c7 40 56 61 8e e8 ba 21 cc 09 4c = 89 f0 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc e8 35 18 a0 ff 90 <0f> 0b = 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f > RSP: 0018:ffffc9000d3d77f8 EFLAGS: 00010087 > RAX: ffffffff81ff6beb RBX: 0000000000000000 RCX: 0000000000100000 > RDX: ffffc9000e51a000 RSI: 00000000000003ec RDI: 00000000000003ed > RBP: 1ffffffff34810d9 R08: ffffffff81ff6ba3 R09: 1ffffd4000093005 > R10: dffffc0000000000 R11: fffff94000093006 R12: dffffc0000000000 > R13: dffffc0000000000 R14: ffffea0000498000 R15: ffffffff9a4086c8 > FS: 00007f77ac12e6c0(0000) GS:ffff88801fc00000(0000) = knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f77ab54b170 CR3: 0000000040b70000 CR4: 0000000000352ef0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >=20 >=20 > --- > 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. >=20 > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >=20 > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title >=20 > 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) >=20 > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report >=20 > If you want to undo deduplication, reply with: > #syz undup