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AJvYcCWXkU6unHvZDG21WqR6Ai8yIYhWCtfgIfODzYChb2anG5GKzZ3G4//jnsJsK/AdTCVS6kCUnYaf8A==@kvack.org X-Gm-Message-State: AOJu0Yyx8VlT7tdCs3CH3XHer1lMMa95FL+PCvL8K5KgsbYYSnZJAyI/ HyiOPveHKrMwqdUvj0YONehZpeGGVHFnuT/sTYGj4rLbmgu3y0usa/TCUN6ip3kOPsIR9k+wO6c 5rGn/t8Frr3QUHcsk2KLgbJApS0z3VceqhNgwq0O9 X-Gm-Gg: ASbGncuJCS7vOHnstTis9grq/iDAoHpGaTuzVVlPwb8U9c4kxsIKo6wlKO16WdLiE79 ZhYb6L6Azl7du4zRkJxAta+xUAPdScZv3I6lll70fZLdkKU/tlV/rASkGEHYR9qvalvUzVvl22y ENB8e1PPoz4dflEUycO3tqVcGePT0JcXYBWNhs6BjKkeHt0h7tVnZNDLq98plWHE1vs8V2wJlnA +JXrhwluccwbeJn2ZEI1DTS2GGYaipxPjXSsw== X-Google-Smtp-Source: AGHT+IEKQ1ZSdA0dCGB/QidlUmKWUeKgpTvh58U9nFdnK2Ys0CFX4j/XIXq5wjXiXS9G9FXtIrhwbcQSHH40WD4PyYQ= X-Received: by 2002:a05:622a:1916:b0:4a7:bed9:5251 with SMTP id d75a77b69052e-4aeddd1e930mr3161cf.9.1753811497192; Tue, 29 Jul 2025 10:51:37 -0700 (PDT) MIME-Version: 1.0 References: <68794b5c.a70a0220.693ce.0050.GAE@google.com> In-Reply-To: From: Suren Baghdasaryan Date: Tue, 29 Jul 2025 10:51:26 -0700 X-Gm-Features: Ac12FXydOXggkkwOKVSAz6ykCOejwKRuh2-g1yX-kFBa882Gm_XdDezYtwexigs Message-ID: Subject: Re: [syzbot] [mm?] BUG: unable to handle kernel paging request in move_pages To: Lokesh Gidra Cc: Peter Xu , syzbot , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: CFB512000C X-Stat-Signature: jxyubq1k8gq5pqrsq65yb6erxbxbjd1s X-HE-Tag: 1753811498-594572 X-HE-Meta: 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 2JY03uaR 0VPnC90ti/WjizRSG5mdCWotWXWorUgJFBbSD1jc2JpZPkGuESZMF3dU2qbi/3FgIAGuS5MaQV+9n9JcvP/atZ6/S5OrfNLeNXrvR2KaRIIMZWGJYdRs8vIQ9oIdLEWH4hS8rJn8c/0BaxyB5iGBoMYUjcPVhpiRMTHeqXfUyCZAVaXu6QLD6mnSs6tqvaGzK9jDMugnUkQs17mddg9+cTCDlmhNUXZ5OyoT7Yt4lcnAQdXn/chzgY9c5BWIujH10ANhRe3lBk3GvIKEInfL/0egCSMF5yyLyBrkDVZJLHDvcIkwkND8ZiYrqfddRyxYE55Ira03pDuOkViIQZVkI3Wxif4HORL5i6eZN6kKIzDccGIxfUn2riFdTlVn3SztWLZhBwlyZ78YOElFfJsblTrhoQWQZ2oPDsOxg23twBBoBZjPKeLl8WAZzq/pjWdy2n6Dlvd8o1My82oKUT2dc75qMZIS5rfk49FhbJqtoV9PuzGang9FrN6bfCe5asW0xGuugf7C87pzIJwjPjH3aLSuqtpS80nrtaA2f7DzA62domlHkPRHJxLhO7paF041d3LTrXPLYB++WmMyFd2G1Q7WnzZDZYZx+agsjbcA96qQe1mYtp7VJic3YWnrQmNznglzlSTPPC2IGF4ZMXWl6XTJEytkjFsFyQ/iUEeKf+ypfEGPV8KOnzUR4lAo825Tj0BWGzpvhCiZisg4PNLPztQ77DrS4jjPyR1MHlhQ1Co5wJ/QUcXxF1qp/snYO4siuxHHNsgqDOWY0eg1Qr8gNlPgxO99XU/iurnVtdYDiD7NC5sZSVjAC2fC7spKHByCrJQ1wfIIydLBZRtE+L8jlluE+BiMcXDgOCn0BdSvXtO/QVCifvx4iaMQMptBTXKJZ7vCk5JOKpUn2wYn3mAPrNnH2EOuKbWM1WN1TnQERQW6GbDGvj9u5+Oz4oUwuqwixOO2RN0+K1xgXxU5cBCGWhSiOQpJO q902cifM J7YSolQE8TLozrg2qtQASo4lhXXYpnOgtFpNTAb7UNpimNMl/vJI1RNZgn5v9JQ02fo4o7LSMXrNGYx9bIWK7vGY7RbHSa5qGIg7ki0JD5pvhRy+YUX9UQ== 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: On Tue, Jul 29, 2025 at 1:08=E2=80=AFAM Lokesh Gidra wrote: > > On Mon, Jul 28, 2025 at 7:51=E2=80=AFPM Suren Baghdasaryan wrote: > > > > On Mon, Jul 28, 2025 at 9:08=E2=80=AFPM Peter Xu wr= ote: > > > > > > Copy Lokesh and Suren. > > Thanks Peter! > > > > Thanks! I'll take a closer look tomorrow morning. > > > I think the issue is that we are incorrectly handling src holes in the > THP case. The reproducer is setting 'mode' to > UFFDIO_MOVE_MODE_ALLOW_SRC_HOLES and it seems like the src address is > indeed untouched at the time MOVE ioctl is invoked and hence likely > has a hole. > > When this mode is set, we (correctly) don't fail with -ENOENT, but > then instead of skipping the page, we keep going with THP move, which > involves fetching the folio unconditionally from the src_pmd, which is > expected to have no page mapped there. > > Suren, can you please double check if my hypothesis is correct? I think in the case of a hole the prior call to pmd_trans_huge_lock() would return NULL and we would not handle it as THP move. I was able to reproduce the crash, though the call stack is a bit different. Will try to figure it out. > > > > > > On Thu, Jul 17, 2025 at 12:13:32PM -0700, syzbot wrote: > > > > Hello, > > > > > > > > syzbot found the following issue on: > > > > > > > > HEAD commit: e8352908bdcd Add linux-next specific files for 2025= 0716 > > > > git tree: linux-next > > > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=3D17f8138= 2580000 > > > > kernel config: https://syzkaller.appspot.com/x/.config?x=3Db7b0e60= e17dc5717 > > > > dashboard link: https://syzkaller.appspot.com/bug?extid=3Db446dbe27= 035ef6bd6c2 > > > > compiler: Debian clang version 20.1.7 (++20250616065708+6146a= 88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 > > > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D10041= 382580000 > > > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D10eb158= c580000 > > > > > > > > Downloadable assets: > > > > disk image: https://storage.googleapis.com/syzbot-assets/ae8cc81c17= 81/disk-e8352908.raw.xz > > > > vmlinux: https://storage.googleapis.com/syzbot-assets/57aaea991896/= vmlinux-e8352908.xz > > > > kernel image: https://storage.googleapis.com/syzbot-assets/feb87161= 9bd4/bzImage-e8352908.xz > > > > > > > > IMPORTANT: if you fix the issue, please add the following tag to th= e commit: > > > > Reported-by: syzbot+b446dbe27035ef6bd6c2@syzkaller.appspotmail.com > > > > > > > > BUG: unable to handle page fault for address: ffffea6000391008 > > > > #PF: supervisor read access in kernel mode > > > > #PF: error_code(0x0000) - not-present page > > > > PGD 13fff8067 P4D 13fff8067 PUD 0 > > > > Oops: Oops: 0000 [#1] SMP KASAN PTI > > > > CPU: 1 UID: 0 PID: 5860 Comm: syz-executor832 Not tainted 6.16.0-rc= 6-next-20250716-syzkaller #0 PREEMPT(full) > > > > Hardware name: Google Google Compute Engine/Google Compute Engine, = BIOS Google 05/07/2025 > > > > RIP: 0010:_compound_head include/linux/page-flags.h:284 [inline] > > > > RIP: 0010:move_pages+0xbe6/0x1430 mm/userfaultfd.c:1824 > > > > Code: c1 ec 06 4b 8d 1c 2c 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 0= 0 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 9a 30 f4 ff <48> 8b 1b= 48 89 de 48 83 e6 01 31 ff e8 59 70 8f ff 48 89 d8 48 83 > > > > RSP: 0018:ffffc90003f778a8 EFLAGS: 00010246 > > > > RAX: 1ffffd4c00072201 RBX: ffffea6000391008 RCX: dffffc0000000000 > > > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > > > > RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 > > > > R10: dffffc0000000000 R11: fffff520007eef00 R12: 0000006000391000 > > > > R13: ffffea0000000000 R14: 200018000e4401fd R15: 00002000003ab000 > > > > FS: 00007ff35708f6c0(0000) GS:ffff8881258aa000(0000) knlGS:0000000= 000000000 > > > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > > CR2: ffffea6000391008 CR3: 0000000074390000 CR4: 00000000003526f0 > > > > Call Trace: > > > > > > > > userfaultfd_move fs/userfaultfd.c:1923 [inline] > > > > userfaultfd_ioctl+0x2e8b/0x4c80 fs/userfaultfd.c:2046 > > > > vfs_ioctl fs/ioctl.c:51 [inline] > > > > __do_sys_ioctl fs/ioctl.c:598 [inline] > > > > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 > > > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > > > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > > > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > > RIP: 0033:0x7ff3570d6519 > > > > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 4= 8 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 b0 ff ff ff f7 d8 64 89 01 48 > > > > RSP: 002b:00007ff35708f218 EFLAGS: 00000246 ORIG_RAX: 0000000000000= 010 > > > > RAX: ffffffffffffffda RBX: 00007ff357160308 RCX: 00007ff3570d6519 > > > > RDX: 0000200000000180 RSI: 00000000c028aa05 RDI: 0000000000000003 > > > > RBP: 00007ff357160300 R08: 0000000000000000 R09: 0000000000000000 > > > > R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff35712d074 > > > > R13: 0000200000000180 R14: 0000200000000188 R15: 00002000002b9000 > > > > > > > > Modules linked in: > > > > CR2: ffffea6000391008 > > > > ---[ end trace 0000000000000000 ]--- > > > > RIP: 0010:_compound_head include/linux/page-flags.h:284 [inline] > > > > RIP: 0010:move_pages+0xbe6/0x1430 mm/userfaultfd.c:1824 > > > > Code: c1 ec 06 4b 8d 1c 2c 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 0= 0 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 9a 30 f4 ff <48> 8b 1b= 48 89 de 48 83 e6 01 31 ff e8 59 70 8f ff 48 89 d8 48 83 > > > > RSP: 0018:ffffc90003f778a8 EFLAGS: 00010246 > > > > RAX: 1ffffd4c00072201 RBX: ffffea6000391008 RCX: dffffc0000000000 > > > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > > > > RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 > > > > R10: dffffc0000000000 R11: fffff520007eef00 R12: 0000006000391000 > > > > R13: ffffea0000000000 R14: 200018000e4401fd R15: 00002000003ab000 > > > > FS: 00007ff35708f6c0(0000) GS:ffff8881258aa000(0000) knlGS:0000000= 000000000 > > > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > > CR2: ffffea6000391008 CR3: 0000000074390000 CR4: 00000000003526f0 > > > > ---------------- > > > > Code disassembly (best guess): > > > > 0: c1 ec 06 shr $0x6,%esp > > > > 3: 4b 8d 1c 2c lea (%r12,%r13,1),%rbx > > > > 7: 48 83 c3 08 add $0x8,%rbx > > > > b: 48 89 d8 mov %rbx,%rax > > > > e: 48 c1 e8 03 shr $0x3,%rax > > > > 12: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx > > > > 19: fc ff df > > > > 1c: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) > > > > 20: 74 08 je 0x2a > > > > 22: 48 89 df mov %rbx,%rdi > > > > 25: e8 9a 30 f4 ff call 0xfff430c4 > > > > * 2a: 48 8b 1b mov (%rbx),%rbx <-- trapping instr= uction > > > > 2d: 48 89 de mov %rbx,%rsi > > > > 30: 48 83 e6 01 and $0x1,%rsi > > > > 34: 31 ff xor %edi,%edi > > > > 36: e8 59 70 8f ff call 0xff8f7094 > > > > 3b: 48 89 d8 mov %rbx,%rax > > > > 3e: 48 rex.W > > > > 3f: 83 .byte 0x83 > > > > > > > > > > > > --- > > > > 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 wit= h: > > > > #syz fix: exact-commit-title > > > > > > > > If you want syzbot to run the reproducer, reply with: > > > > #syz test: git://repo/address.git branch-or-commit-hash > > > > If you attach or paste a git patch, syzbot will apply it before tes= ting. > > > > > > > > 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 > > > > > > > > > > -- > > > Peter Xu > > >