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AJvYcCUEapHBgKIw6SxMwFvC7Q3DTO6ZJ1uJsojt8LA/z3Be11F7AywhtJFXjU9Scj8BWFkCJrObLi4emQ==@kvack.org X-Gm-Message-State: AOJu0YztC6DdwIAGj2gGdP6OLyCwMVNy+ur6QuwQrWyFcJNMXbUQxaIi 58RkjCDs1avOv/Jg7AijQS17KZnRq+3aZqAMXov8MZQwj2JOB7byf9vPlviWn3FnLZypoSLO3mt ixD3lfwSWLMBsjPB+XDWffgqE+fD8zSWG+tFqmj2i X-Gm-Gg: ASbGncuBDcnAPIX4aSahPbSWLaBLdvMl762fP9OfJBliZ4Bw4Kgwoh6RpqsmKG1mLpE Ycxsh3ya+VvCQa1Uud847EIqcwztAhVrpRYQzh7OacVIRNIwA38jWtS38qs7YcxzYskJuT6ELnh hWyS8k4w/F+P6hUq2bhTTLUuVI2SkxGwhCD70RMtrIa+wr4auIiIy/MrAj3HYyPNrt3cvywGZ0N p7t/4/+ddWztdPC3y0WJchl+QxWUfbLPcSb/A== X-Google-Smtp-Source: AGHT+IHJSGoncxy6snA63ICBiOwoo+mkeZNRxbOighGafxurDE8wizkpCLimPwYtssEQItZCmnQsCPsYpjGYx5A8nV4= X-Received: by 2002:a05:622a:281:b0:4aa:cba2:2e67 with SMTP id d75a77b69052e-4aedf66ab3dmr4744811cf.21.1753895380766; Wed, 30 Jul 2025 10:09:40 -0700 (PDT) MIME-Version: 1.0 References: <68794b5c.a70a0220.693ce.0050.GAE@google.com> In-Reply-To: From: Suren Baghdasaryan Date: Wed, 30 Jul 2025 10:09:29 -0700 X-Gm-Features: Ac12FXy9U8CDMEZDRh4a79HB_hxWTB9tzdWfnoQgViYYKcrZcwYxF8AOn0Jg8Dk 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-Rspamd-Queue-Id: 5464616000F X-Stat-Signature: jj9bsf4dxqiojo6ciphqjg46cnpx9da8 X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1753895382-466488 X-HE-Meta: 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 75G8MxiC 1iwmcL+rBqd5+JiIdrKDBYk804jj2ryMstGnjlcx1ALqlrPFfrCYDHk2j6si9WG2tKUZp/8QTfdtJjVBEdbfpkgj7KDJx49QHfjljPvjdISZeWcckWF/vXWm46LlAIbv+9qk12GvqsY6Zozv41wW1Q9nZUTS3osC6mR+MI3ONdn1kT7C+QX+abcts0b0m0ZMCjvf84OpM6MTjmqO0q0CmZbhE2aR8o9QiGCY708C2ctDME97vez/eVoAJ0dMOC7lrNDdBMXX1/2EfW8N/wIvb3FkiKLl9tPRO2xV3Z+WIixdxiacyGh+Gvywrjg2WnxD0IHP6Z5BCKpxfK/+yCTEb9qna4EpgkBMfJfX50wU8AgRLkkcast2+8BQO7deFcpryXoPxASo2A6ih2H3Mauae5jd2sdt7z1CBCrZr4WhFeVRff5i51XT7FwtWt/RmAXVWMvrMN1e87EGkZICoJMddsaOqQemjyT/SkEyh+Yh7Ub2HA6V6zV6yma38fSCfa7/in39w7sevikzJEHb7LO0oRLjfpmiU0fFn4XKLlJOZu98MhcGW0gdGxUyM3/zlFAScK8GfLBj6BRvgXr+w81zqv8D4AxPDU+6pws+aOMEiymfRi5htCekIfWDMcMgnpkPedI5jImfcAn1Q6qFUMC6rj95PAHm3IlKcvAeqhqiAhKK/WbahuDtJvUgE8Rcz9VczPLL99+YWv2X9nbawAcf8qSkVG/7cBBxaY5Uj1EF2svLNToEHnTQxXZr2LbwbYjiQ2QjKw5mweY9i5wze0vYMT3JE9G6s5bwUlACcQGjM+LETvC84BVvUu3I7+q52hYH6rmWvlrEPz23ZJrPMZ1K2kxgtQZe2WvKMwMtEszqfjnZqQNSd3EaxBNpVL6lEVTtI8Z1rs6y4twBlwGxZRijWhICEoBx8n9W1K369+oJ8UEPEBn5+WSQFEf+yuYkcOQF2doH+f2UJfPQPNPrWEtvjUEpYvvGE JPtRlOgc toEdKTjOqZvhlAA7LB9VSx1koH22gEees96ENOUZoPgbGVglLfQUBOmzE8Kcys392QSk9X6D4V+Xt/Z7CnvVKN26M2hjO07cWyfbhLCoZh9K/u+OgWKUQIX3DFpIVXLS+v7nni1kFe4= 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 10:51=E2=80=AFAM Suren Baghdasaryan wrote: > > 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 = wrote: > > > > > > > > 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. Ok, pmd_trans_huge_lock() actually confused non-present PMD with a swap/migration entry and does not return NULL in such cases. I posted a fix here: https://lore.kernel.org/all/20250730170733.3829267-1-surenb@goo= gle.com/ > > > > > > > > > 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 20= 250716 > > > > > git tree: linux-next > > > > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=3D17f81= 382580000 > > > > > kernel config: https://syzkaller.appspot.com/x/.config?x=3Db7b0e= 60e17dc5717 > > > > > dashboard link: https://syzkaller.appspot.com/bug?extid=3Db446dbe= 27035ef6bd6c2 > > > > > compiler: Debian clang version 20.1.7 (++20250616065708+614= 6a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 > > > > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D100= 41382580000 > > > > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D10eb1= 58c580000 > > > > > > > > > > Downloadable assets: > > > > > disk image: https://storage.googleapis.com/syzbot-assets/ae8cc81c= 1781/disk-e8352908.raw.xz > > > > > vmlinux: https://storage.googleapis.com/syzbot-assets/57aaea99189= 6/vmlinux-e8352908.xz > > > > > kernel image: https://storage.googleapis.com/syzbot-assets/feb871= 619bd4/bzImage-e8352908.xz > > > > > > > > > > IMPORTANT: if you fix the issue, please add the following tag to = the commit: > > > > > Reported-by: syzbot+b446dbe27035ef6bd6c2@syzkaller.appspotmail.co= m > > > > > > > > > > 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-= rc6-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= 00 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:00000= 00000000000 > > > > > 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= 48 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: 00000000000= 00010 > > > > > 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= 00 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:00000= 00000000000 > > > > > 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 ins= truction > > > > > 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 w= ith: > > > > > #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 t= esting. > > > > > > > > > > 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 > > > >