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2024 18:52:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1730832769; bh=XyMYyo3Oig+FDBovBjyMUZ1jHCb4RkEVdx7pQNxMmBk=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=A7rTmj5PoDZ+NsN9ezFu87Z3DJaWy5yhmBDNis1cK/YjWCbSvzf/Gf4xgXWj8seUS 7duUs+45K6kf2QKCT5iubuiZSUaA0i5BqYLhjzJW88Jw/mITmeBZ5D1L8l4eXWtdm/ cHuzGjDjQuueUGGSmzjtIu5w0UBrbYC0gnn0FFBE= Date: Tue, 5 Nov 2024 10:52:48 -0800 From: Andrew Morton To: syzbot Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, kvm@vger.kernel.org Subject: Re: [syzbot] [mm?] BUG: Bad page state in kvm_coalesced_mmio_init Message-Id: <20241105105248.812dc586921df56e5bf78a5e@linux-foundation.org> In-Reply-To: <6729f475.050a0220.701a.0019.GAE@google.com> References: <6729f475.050a0220.701a.0019.GAE@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 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 3cWdhkQM GTE9ycXt105Ttvxu7Nyab+C6gRoRbtNyyFk/1aHViZAYauN+BLx3uUuZprJMn0GEGHY/2NuWuBAetF8YLiethDv+KoR8lS9fcMIrwoBLKpXzpm707Lh1mQ== 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: (cc kvm list) On Tue, 05 Nov 2024 02:33:25 -0800 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 59b723cd2adb Linux 6.12-rc6 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17996587980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=11254d3590b16717 > dashboard link: https://syzkaller.appspot.com/bug?extid=e985d3026c4fd041578e > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > userspace arch: i386 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/202d791be971/disk-59b723cd.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/9bfa02908d87/vmlinux-59b723cd.xz > kernel image: https://storage.googleapis.com/syzbot-assets/93c8c8740b4d/bzImage-59b723cd.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+e985d3026c4fd041578e@syzkaller.appspotmail.com > > BUG: Bad page state in process syz.5.504 pfn:61f45 > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x61f45 > flags: 0xfff00000080204(referenced|workingset|mlocked|node=0|zone=1|lastcpupid=0x7ff) > raw: 00fff00000080204 0000000000000000 dead000000000122 0000000000000000 > raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 > page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set > page_owner tracks the page as allocated > page last allocated via order 0, migratetype Unmovable, gfp_mask 0x400dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO), pid 8443, tgid 8442 (syz.5.504), ts 201884660643, free_ts 201499827394 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 > prep_new_page mm/page_alloc.c:1545 [inline] > get_page_from_freelist+0x303f/0x3190 mm/page_alloc.c:3457 > __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4733 > alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 > kvm_coalesced_mmio_init+0x1f/0xf0 virt/kvm/coalesced_mmio.c:99 > kvm_create_vm virt/kvm/kvm_main.c:1235 [inline] > kvm_dev_ioctl_create_vm virt/kvm/kvm_main.c:5488 [inline] > kvm_dev_ioctl+0x12dc/0x2240 virt/kvm/kvm_main.c:5530 > __do_compat_sys_ioctl fs/ioctl.c:1007 [inline] > __se_compat_sys_ioctl+0x510/0xc90 fs/ioctl.c:950 > do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] > __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386 > do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411 > entry_SYSENTER_compat_after_hwframe+0x84/0x8e > page last free pid 8399 tgid 8399 stack trace: > reset_page_owner include/linux/page_owner.h:25 [inline] > free_pages_prepare mm/page_alloc.c:1108 [inline] > free_unref_folios+0xf12/0x18d0 mm/page_alloc.c:2686 > folios_put_refs+0x76c/0x860 mm/swap.c:1007 > free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335 > __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] > tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] > tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] > tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 > tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 > exit_mmap+0x496/0xc40 mm/mmap.c:1926 > __mmput+0x115/0x390 kernel/fork.c:1348 > exit_mm+0x220/0x310 kernel/exit.c:571 > do_exit+0x9b2/0x28e0 kernel/exit.c:926 > do_group_exit+0x207/0x2c0 kernel/exit.c:1088 > __do_sys_exit_group kernel/exit.c:1099 [inline] > __se_sys_exit_group kernel/exit.c:1097 [inline] > __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 > x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 > 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 > Modules linked in: > CPU: 0 UID: 0 PID: 8442 Comm: syz.5.504 Not tainted 6.12.0-rc6-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 > Call Trace: > > __dump_stack lib/dump_stack.c:94 [inline] > dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 > bad_page+0x176/0x1d0 mm/page_alloc.c:501 > free_page_is_bad mm/page_alloc.c:918 [inline] > free_pages_prepare mm/page_alloc.c:1100 [inline] > free_unref_page+0xed0/0xf20 mm/page_alloc.c:2638 > kvm_destroy_vm virt/kvm/kvm_main.c:1327 [inline] > kvm_put_kvm+0xc75/0x1350 virt/kvm/kvm_main.c:1386 > kvm_vcpu_release+0x54/0x60 virt/kvm/kvm_main.c:4143 > __fput+0x23f/0x880 fs/file_table.c:431 > task_work_run+0x24f/0x310 kernel/task_work.c:239 > exit_task_work include/linux/task_work.h:43 [inline] > do_exit+0xa2f/0x28e0 kernel/exit.c:939 > do_group_exit+0x207/0x2c0 kernel/exit.c:1088 > __do_sys_exit_group kernel/exit.c:1099 [inline] > __se_sys_exit_group kernel/exit.c:1097 [inline] > __ia32_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 > ia32_sys_call+0x2624/0x2630 arch/x86/include/generated/asm/syscalls_32.h:253 > do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] > __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386 > do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411 > entry_SYSENTER_compat_after_hwframe+0x84/0x8e > RIP: 0023:0xf745d579 > Code: Unable to access opcode bytes at 0xf745d54f. > RSP: 002b:00000000f75afd6c EFLAGS: 00000206 ORIG_RAX: 00000000000000fc > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 00000000ffffff9c RDI: 00000000f744cff4 > RBP: 00000000f717ae61 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > > > > --- > 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