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AJvYcCWRgDNkVXPx+5DBFSm6fgarFYj+bulADzNlJXKTz3hd5vg8wPCE9AzP88ViuhJrlW0EZLMOMgapmGMhQhg=@vger.kernel.org X-Gm-Message-State: AOJu0YyKHLERHkBUkW4ihQ2tGDcrGIJaQ9Sd8YrImVRgOeKNXIefeyZx SvyGcW5ZwzU8ottfIC4cRNjJLFBPxOV7Cg4ytBqZ0QW9aDySbsXkZXQpsFxSaEZym3G9MSM9KNs psYbqq4KqTyFhujrO9UWuqYqO/JxPFNF/FMim3ChDsZOo+mqT8Pk7RRr5u8k= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:617:b0:663:96:a8e0 with SMTP id 006d021491bc7-66d0a478383mr4646526eaf.23.1770604447045; Sun, 08 Feb 2026 18:34:07 -0800 (PST) Date: Sun, 08 Feb 2026 18:34:07 -0800 In-Reply-To: <20260209015545.20766-1-kartikey406@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6989479f.050a0220.3b3015.0066.GAE@google.com> Subject: Re: [syzbot] [kvm?] WARNING in kvm_gmem_fault_user_mapping From: syzbot To: kartikey406@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in __unmap_hugepage_range Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057] CPU: 0 UID: 0 PID: 6527 Comm: syz.4.21 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:hstate_inode include/linux/hugetlb.h:540 [inline] RIP: 0010:hstate_file include/linux/hugetlb.h:756 [inline] RIP: 0010:hstate_vma include/linux/hugetlb.h:772 [inline] RIP: 0010:__unmap_hugepage_range+0x113/0x15f0 mm/hugetlb.c:5177 Code: 48 c1 ea 03 80 3c 02 00 0f 85 dd 12 00 00 48 8b 9b 38 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 cb 12 00 00 48 8b 43 50 48 89 44 24 10 48 05 a8 RSP: 0018:ffffc90003e9f700 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000200000800000 RDX: 000000000000000a RSI: ffffffff826be487 RDI: 0000000000000050 RBP: ffff88804f9ff000 R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000400000 R11: 0000000000000000 R12: 0000000000000003 R13: ffff88804f9ff000 R14: 0000200000000000 R15: 0000200000800000 FS: 0000000000000000(0000) GS:ffff8881245d9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f37b2b31000 CR3: 000000006529d000 CR4: 00000000003526f0 Call Trace: unmap_single_vma+0x1ef/0x240 mm/memory.c:2058 unmap_vmas+0x218/0x470 mm/memory.c:2104 exit_mmap+0x181/0xae0 mm/mmap.c:1277 __mmput+0x12a/0x410 kernel/fork.c:1173 mmput+0x67/0x80 kernel/fork.c:1196 exit_mm kernel/exit.c:581 [inline] do_exit+0x78a/0x2a30 kernel/exit.c:959 do_group_exit+0xd5/0x2a0 kernel/exit.c:1112 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034 arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop+0x86/0x4b0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x4fe/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1b38f9aeb9 Code: Unable to access opcode bytes at 0x7f1b38f9ae8f. RSP: 002b:00007f1b39d820e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f1b39215fa8 RCX: 00007f1b38f9aeb9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f1b39215fac RBP: 00007f1b39215fa0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1b39216038 R14: 00007ffe5bb4b350 R15: 00007ffe5bb4b438 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hstate_inode include/linux/hugetlb.h:540 [inline] RIP: 0010:hstate_file include/linux/hugetlb.h:756 [inline] RIP: 0010:hstate_vma include/linux/hugetlb.h:772 [inline] RIP: 0010:__unmap_hugepage_range+0x113/0x15f0 mm/hugetlb.c:5177 Code: 48 c1 ea 03 80 3c 02 00 0f 85 dd 12 00 00 48 8b 9b 38 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 cb 12 00 00 48 8b 43 50 48 89 44 24 10 48 05 a8 RSP: 0018:ffffc90003e9f700 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000200000800000 RDX: 000000000000000a RSI: ffffffff826be487 RDI: 0000000000000050 RBP: ffff88804f9ff000 R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000400000 R11: 0000000000000000 R12: 0000000000000003 R13: ffff88804f9ff000 R14: 0000200000000000 R15: 0000200000800000 FS: 0000000000000000(0000) GS:ffff8881246d9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6a9d71f286 CR3: 0000000060f0e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 dd 12 00 00 jne 0x12eb e: 48 8b 9b 38 06 00 00 mov 0x638(%rbx),%rbx 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 8d 7b 50 lea 0x50(%rbx),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 cb 12 00 00 jne 0x12ff 34: 48 8b 43 50 mov 0x50(%rbx),%rax 38: 48 89 44 24 10 mov %rax,0x10(%rsp) 3d: 48 rex.W 3e: 05 .byte 0x5 3f: a8 .byte 0xa8 Tested on: commit: 05f7e89a Linux 6.19 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=125217fa580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f1fac0919970b671 dashboard link: https://syzkaller.appspot.com/bug?extid=33a04338019ac7e43a44 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=171d865a580000