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d="scan'208";a="314831359" Received: from unknown (HELO gm-smtp11.centrum.cz) ([46.255.227.75]) by antispam27.centrum.cz with ESMTP; 16 Apr 2025 14:07:22 +0200 Received: from arkam (ip-213-220-240-96.bb.vodafone.cz [213.220.240.96]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by gm-smtp11.centrum.cz (Postfix) with ESMTPSA id A05CB100AE2A3; Wed, 16 Apr 2025 14:07:22 +0200 (CEST) Date: Wed, 16 Apr 2025 14:07:20 +0200 From: Petr =?utf-8?B?VmFuxJtr?= To: linux-kernel@vger.kernel.org Cc: Kevin Brodsky , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, xen-devel@lists.xenproject.org, linux-arch@vger.kernel.org Subject: Regression from a9b3c355c2e6 ("asm-generic: pgalloc: provide generic __pgd_{alloc,free}") with CONFIG_DEBUG_VM_PGFLAGS=y and Xen Message-ID: <202541612720-Z_-deOZTOztMXHBh-arkamar@atlas.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: BC2294000B X-Stat-Signature: oeatq7q9xkr69sq8gogfsb31mqye9cf9 X-HE-Tag: 1744805246-922488 X-HE-Meta: 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 iKO8yo3Y 4ymFIXbal6vUF2/f6jRZBEY3xU1Dt9cgsOX8fXC6p62Tz2UvmrGVv4atN+4rxVMfDGj7s0DJDz4+oNNl5ZTf/bu4JdhSqrUY754MzGVsnuRVEa+9nRhzsgWXnkfTK9tWYqdPodKBArLoH7X4DG9/3aFHCh4TJVh/dUtsKeyO3sZYtctrlzgOWBa1ZZdcBKNEJRLT7O7szDUyWIENg7grrZYmXO0V/EfDSrtatcS2CBrPKt+DrWIVZ07vi4SACoVga1sAOVxdf7x4JpKlRDr52o2Q04GhpWBSz+z0fuEXYUMd0FHNJ3yAHNWZL4DSehbePyTlnTbhaAvgCvLf9Bx2WyXLf3Med6jnuB/52KNJ7Hq/RlFgaXBZYF24kMue7gs8pwVW98q2J75++9Z4z7X7aOQXaoTNN5SA3Xh8NbParm1zlZwDDPv0cnzhChgLzmivCiFgLHrA2hOtni7nPoVNiP3YTp/IkxGk0nvZDpYz22Gt26v40NluI+Mfoiw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi all, I have discovered a regression introduced in commit a9b3c355c2e6 ("asm-generic: pgalloc: provide generic __pgd_{alloc,free}") [1,2] in kernel version 6.14. The problem occurs when the x86 kernel is configured with CONFIG_DEBUG_VM_PGFLAGS=y and is run as a PV Dom0 in Xen 4.19.1. During the startup, the kernel panics with the error log below. The commit changed PGD allocation path. In the new implementation _pgd_alloc allocates memory with __pgd_alloc, which indirectly calls alloc_pages_noprof(gfp | __GFP_COMP, order); This is in contrast to the old behavior, where __get_free_pages was used, which indirectly called alloc_pages_noprof(gfp_mask & ~__GFP_HIGHMEM, order); The key difference is that the new allocator can return a compound page. When xen_pin_page is later called on such a page, it call TestSetPagePinned function, which internally uses the PF_NO_COMPOUND macro. This macro enforces VM_BUG_ON_PGFLAGS if PageCompound is true, triggering the panic when CONFIG_DEBUG_VM_PGFLAGS is enabled. I am reporting this issue without a patch as I am not sure which part of the code should be adapted to resolve the regression. Let me know if I forgot to mention something important. Cheers, Petr [1] a9b3c355c2e6 ("asm-generic: pgalloc: provide generic __pgd_{alloc,free}") [2] https://lkml.kernel.org/r/20250103184415.2744423-6-kevin.brodsky@arm.com [ 0.396244] mem auto-init: stack:all(zero), heap alloc:off, heap free:off [ 0.398164] software IO TLB: area num 2. [ 0.449383] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 [ 0.452043] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888003450000 pfn:0x344e [ 0.454715] head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 0.456908] flags: 0x10000000000040(head|node=0|zone=1) [ 0.458390] raw: 0010000000000040 ffffffff82850ed0 ffffffff82850ed0 0000000000000000 [ 0.460621] raw: ffff888003450000 ffff888003454000 00000001ffffffff 0000000000000000 [ 0.462807] head: 0010000000000040 ffffffff82850ed0 ffffffff82850ed0 0000000000000000 [ 0.464928] head: ffff888003450000 ffff888003454000 00000001ffffffff 0000000000000000 [ 0.467106] head: 0010000000000001 ffffea00000d1381 ffffffffffffffff 0000000000000000 [ 0.469263] head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000 [ 0.471430] page dumped because: VM_BUG_ON_PAGE(1 && PageCompound(page)) [ 0.473338] ------------[ cut here ]------------ [ 0.474764] kernel BUG at include/linux/page-flags.h:527! [ 0.476473] Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI [ 0.478294] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.13.0-rc6-00187-ga9b3c355c2e6 #41 [ 0.480971] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-20240910_120124-localhost 04/01/2014 [ 0.484218] RIP: e030:xen_pin_page+0x5e/0x180 [ 0.485580] Code: f0 48 0f ba 2e 0a 73 24 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 a1 75 e1 00 48 c7 c6 68 70 58 82 48 89 df e8 c2 da 30 00 <0f> 0b 49 bd 00 00 00 00 00 16 00 00 31 ff 41 89 d4 48 b8 00 00 00 [ 0.491414] RSP: e02b:ffffffff82803d18 EFLAGS: 00010046 [ 0.493064] RAX: 000000000000003c RBX: ffffea00000d1380 RCX: 0000000000000000 [ 0.495294] RDX: 0000000000000000 RSI: ffffffff82803b68 RDI: 00000000ffffffff [ 0.497513] RBP: ffffffff82803d48 R08: 00000000ffffdfff R09: ffffffff82925148 [ 0.499723] R10: ffffffff828751a0 R11: ffffffff82803a88 R12: ffff88800344e000 [ 0.501940] R13: ffff88808344e000 R14: ffff88800344e000 R15: 0000000000000100 [ 0.504180] FS: 0000000000000000(0000) GS:ffff88803aa00000(0000) knlGS:0000000000000000 [ 0.506699] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.508485] CR2: ffffc90000a00000 CR3: 0000000002842000 CR4: 0000000000000660 [ 0.510648] Call Trace: [ 0.511420] [ 0.512071] ? show_regs.part.0+0x1d/0x30 [ 0.513315] ? __die+0x52/0x90 [ 0.514282] ? die+0x2a/0x50 [ 0.515189] ? do_trap+0x10e/0x120 [ 0.516255] ? do_error_trap+0x6e/0xa0 [ 0.517453] ? xen_pin_page+0x5e/0x180 [ 0.518611] ? exc_invalid_op+0x52/0x70 [ 0.519805] ? xen_pin_page+0x5e/0x180 [ 0.520936] ? asm_exc_invalid_op+0x1b/0x20 [ 0.522245] ? xen_pin_page+0x5e/0x180 [ 0.523424] ? xen_pin_page+0x5e/0x180 [ 0.524596] __xen_pgd_walk+0x2a0/0x2d0 [ 0.525816] ? __pfx_xen_pin_page+0x10/0x10 [ 0.527116] __xen_pgd_pin+0x4d/0x180 [ 0.528288] xen_enter_mmap+0x25/0x40 [ 0.529431] poking_init+0x53/0x130 [ 0.530558] start_kernel+0x4a7/0x6f0 [ 0.531726] x86_64_start_reservations+0x29/0x30 [ 0.533197] xen_start_kernel+0x6cf/0x6e0 [ 0.534466] startup_xen+0x1f/0x20 [ 0.535497] [ 0.536193] ---[ end trace 0000000000000000 ]--- [ 0.537676] RIP: e030:xen_pin_page+0x5e/0x180 [ 0.539049] Code: f0 48 0f ba 2e 0a 73 24 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 a1 75 e1 00 48 c7 c6 68 70 58 82 48 89 df e8 c2 da 30 00 <0f> 0b 49 bd 00 00 00 00 00 16 00 00 31 ff 41 89 d4 48 b8 00 00 00 [ 0.544954] RSP: e02b:ffffffff82803d18 EFLAGS: 00010046 [ 0.546553] RAX: 000000000000003c RBX: ffffea00000d1380 RCX: 0000000000000000 [ 0.548821] RDX: 0000000000000000 RSI: ffffffff82803b68 RDI: 00000000ffffffff [ 0.551022] RBP: ffffffff82803d48 R08: 00000000ffffdfff R09: ffffffff82925148 [ 0.553233] R10: ffffffff828751a0 R11: ffffffff82803a88 R12: ffff88800344e000 [ 0.555420] R13: ffff88808344e000 R14: ffff88800344e000 R15: 0000000000000100 [ 0.557365] FS: 0000000000000000(0000) GS:ffff88803aa00000(0000) knlGS:0000000000000000 [ 0.559528] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.561050] CR2: ffffc90000a00000 CR3: 0000000002842000 CR4: 0000000000000660 [ 0.562970] Kernel panic - not syncing: Attempted to kill the idle task! (XEN) Hardware Dom0 crashed: rebooting machine in 5 seconds. QEMU: Terminated