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Thu, 20 Mar 2025 12:09:36 -0700 (PDT) Date: Thu, 20 Mar 2025 12:09:36 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67dc67f0.050a0220.25ae54.001e.GAE@google.com> Subject: [syzbot] [mm?] BUG: unable to handle kernel paging request in vma_merge_existing_range From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: E6044C0011 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: tr8nd1sqwx1zmxr7san5ehxhiqpkahyx X-HE-Tag: 1742497776-708806 X-HE-Meta: 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 x5KYqln8 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 9bFlAC7A Q0WD/uI6Bxjg7BzX0TUNGIlmJj+0gOgbv7U6v8NGS+1bHGfR4UBTXC81czFV96mqhvREWAaVuHwVu8E5aKemlIet7pTfAVrbrsNHLsj/aA36OiBU4C8uStg7i34B/UBn+xRsihMEPcjQp/FHxu8pRYfBxngYUCDJrAmCONLw/rRkz9VCHaLhfNfI5sIiO5/djh/I5NAPZTBove1NNC1CKK0Juu5BFeEmjKFMiGCS9cqQyNQ25wackt1f57jPSzZgXvurlWCMx0aJ7RpNQGW6LX3Egtkb+jHlSrDMQiKuq8oNmCdCwpUsptIp+uMRkrAiDIEAvUJWmzlFxE1l0uss1ReQ/8RxB7N5+ALiYAzIVmHj5pcMTC6YYKxbUDY8bUsoLpJHPXVG7wgImHDyD+MmoM40Z3RvwpwA 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: Hello, syzbot found the following issue on: HEAD commit: eb88e6bfbc0a Merge tag 'fsnotify_for_v6.14-rc7' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11e6c83f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=77423669c2b8fa9 dashboard link: https://syzkaller.appspot.com/bug?extid=20ed41006cf9d842c2b5 compiler: gcc (Debian 12.2.0-14) 12.2.0, 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 (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-eb88e6bf.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ded0ce69669f/vmlinux-eb88e6bf.xz kernel image: https://storage.googleapis.com/syzbot-assets/6e6fa3c719e7/bzImage-eb88e6bf.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+20ed41006cf9d842c2b5@syzkaller.appspotmail.com RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 BUG: unable to handle page fault for address: fffffffffffffff4 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD df84067 P4D df84067 PUD df86067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 1 UID: 0 PID: 17805 Comm: syz.8.3237 Not tainted 6.14.0-rc6-syzkaller-00212-geb88e6bfbc0a #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:vma_merge_existing_range+0x266/0x2070 mm/vma.c:734 Code: e8 5f 25 ad ff 48 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 1c 19 00 00 48 8b 04 24 48 8b 74 24 08 <4c> 8b 38 4c 89 ff e8 9f 1f ad ff 48 8b 44 24 08 49 39 c7 0f 83 db RSP: 0000:ffffc9000319f988 EFLAGS: 00010246 RAX: fffffffffffffff4 RBX: ffffc9000319fae8 RCX: ffffffff820cd3e5 RDX: 1ffffffffffffffe RSI: 0000000080c2a000 RDI: 0000000000000005 RBP: 0000000080ce2000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001 R13: ffffc9000319fb08 R14: ffff888025eddc98 R15: ffff88804eec0a00 FS: 0000000000000000(0000) GS:ffff88802b500000(0063) knlGS:00000000f5106b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: fffffffffffffff4 CR3: 00000000614d6000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vma_modify.constprop.0+0x87/0x410 mm/vma.c:1517 vma_modify_flags_uffd+0x241/0x2e0 mm/vma.c:1598 userfaultfd_clear_vma+0x91/0x130 mm/userfaultfd.c:1906 userfaultfd_release_all+0x2ae/0x4c0 mm/userfaultfd.c:2024 userfaultfd_release+0xf4/0x1c0 fs/userfaultfd.c:865 __fput+0x3ff/0xb70 fs/file_table.c:464 task_work_run+0x14e/0x250 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:390 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:412 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7fe6579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f510655c EFLAGS: 00000296 ORIG_RAX: 0000000000000135 RAX: 0000000000000001 RBX: 0000000080000180 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: fffffffffffffff4 ---[ end trace 0000000000000000 ]--- RIP: 0010:vma_merge_existing_range+0x266/0x2070 mm/vma.c:734 Code: e8 5f 25 ad ff 48 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 1c 19 00 00 48 8b 04 24 48 8b 74 24 08 <4c> 8b 38 4c 89 ff e8 9f 1f ad ff 48 8b 44 24 08 49 39 c7 0f 83 db RSP: 0000:ffffc9000319f988 EFLAGS: 00010246 RAX: fffffffffffffff4 RBX: ffffc9000319fae8 RCX: ffffffff820cd3e5 RDX: 1ffffffffffffffe RSI: 0000000080c2a000 RDI: 0000000000000005 RBP: 0000000080ce2000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001 R13: ffffc9000319fb08 R14: ffff888025eddc98 R15: ffff88804eec0a00 FS: 0000000000000000(0000) GS:ffff88802b500000(0063) knlGS:00000000f5106b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: fffffffffffffff4 CR3: 00000000614d6000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: e8 5f 25 ad ff call 0xffad2564 5: 48 8b 14 24 mov (%rsp),%rdx 9: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 10: fc ff df 13: 48 c1 ea 03 shr $0x3,%rdx 17: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 1b: 0f 85 1c 19 00 00 jne 0x193d 21: 48 8b 04 24 mov (%rsp),%rax 25: 48 8b 74 24 08 mov 0x8(%rsp),%rsi * 2a: 4c 8b 38 mov (%rax),%r15 <-- trapping instruction 2d: 4c 89 ff mov %r15,%rdi 30: e8 9f 1f ad ff call 0xffad1fd4 35: 48 8b 44 24 08 mov 0x8(%rsp),%rax 3a: 49 39 c7 cmp %rax,%r15 3d: 0f .byte 0xf 3e: 83 .byte 0x83 3f: db .byte 0xdb --- 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