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Mon, 07 Apr 2025 03:13:31 -0700 (PDT) MIME-Version: 1.0 References: <67f1c7df.050a0220.0a13.0256.GAE@google.com> <07a22812-4f5b-44e2-a4ce-ad0537934041@lucifer.local> In-Reply-To: <07a22812-4f5b-44e2-a4ce-ad0537934041@lucifer.local> From: Aleksandr Nogikh Date: Mon, 7 Apr 2025 12:13:19 +0200 X-Gm-Features: ATxdqUFjGdWIY06l8_7_zXJNV37YUknnNrM5U7iu92QlypWDo1KBi2KXyJNr3pI Message-ID: Subject: Re: [syzbot] [mm?] general protection fault in mremap To: Lorenzo Stoakes Cc: syzbot , Liam.Howlett@oracle.com, akpm@linux-foundation.org, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 7CFB54000A X-Stat-Signature: hjo174qnce5qyis3kqie4aihsd653kro X-Rspam-User: X-HE-Tag: 1744020812-688356 X-HE-Meta: U2FsdGVkX18JBAL2adhayoSkDVImM19jYlOxKFPL2SZ7tHfOD3EAHKX8TGAhasSvi3NonEV4RqrEvq1PrKIBBcnZXsbV5Aa7y0WVW4Mq+AR8qMsHA/vnVdPwR6weIrvDzc57+Z9RBWORneKFTTWQgX0GQP72TK04ceq3+OmlPVUwiTr4R745sDmrS9ibUfpbfEhyeKjqnXJ7qNhSGIFp772SEdFf+BkCeOeoIIGpcXCGzoCEpJxsoVqkUQgXBb7rWbCl1KHeP69LD0T6Aw7quO2zrI5xApUG38fzt4a/QAffZsAOOeCFoMy59CnZB6u3kRRmGmt0KB1rFUyLc8mef3aItZvUl6rBiI+IH8kxxzJyE6T5MIYYr4fkZ+YmkeMrv59PLe9kzFqs++cRQzr5KG7YRGwmlBJCp8W3hUw7fvySbCEnZHG9D1XSWfWJtPGMfYQDBk9UHq1m5Pg2i9UigUkl+BCVGJmfFgSvRbx2lA60hjKCM9s0XN/QwwPLs9/OBbP0wohLQWSDfdbmpLG0Vo/iucZJptmTEbZZL5/QX3m76LQg5iXQngyrD1QRiFI9pjYuXM1I4OoWZN47ETxb77dHYBiAQ2wpKOm4dyjAsp5WZrSWEnrhBZnPeTbe4Q88OOfPoFdJvw5M6mjKcIjxZYAPGwRoEa+CPNfpufmUtJ+L3xXQ+JpmH0BDsJ0JW/XeKgmZe2s311YHzJpz9FvTay0dh8z3WxxsfMuRKfcurx3yHhjpbhmwRFgYB23nSq4EH9inq1QXUi8khQdegwXOSRZLsZckH0zNaJBDICMPEA5GmIGr5AfL53n1LQ7EgsMycp5+pAOOJiTEsi8MmRGLxamNsrpytnpDAQqpNHKVrx+baoNwN3wtLv/CjV9UZBOJvvL9+nF4J4CvjiVEWVHnZ54UYDAPB9qlfXQ/4XoCyLGe+NMvPu7Fwh36i6SLy0gHHuM2kUXG/8AGZUMNpRZ 3bBbRLR/ 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 S6XSySBq FNAvnanhcTG9EAu6oTwfpMtgcT32Ykhw 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: Hi Lorenzo, Thanks for looking at the report! On Mon, Apr 7, 2025 at 12:09=E2=80=AFPM 'Lorenzo Stoakes' via syzkaller-bug= s wrote: > > I did actually try to mark this fixed, but apparently syz fix doesn't wor= k or > doesn't prevent other syzbots from duplicating reports. This part is not very clear - why would #syz fix: title not work well here? > > Anyway, this is fixed in commit 36eed5400805 ("mm/mremap: do not set > vrm->vma NULL immediately prior to checking it"), was fixed a long time > ago, as soon as reported, and it's been a matter of waiting for this to > land in Linus's tree. > > This is now fixed, upstream, and this report is - as a result - redundant= . > > Thanks, Lorenzo --=20 Aleksandr > > On Sat, Apr 05, 2025 at 05:16:31PM -0700, syzbot wrote: > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: a2cc6ff5ec8f Merge tag 'firewire-updates-6.15' of git:/= /gi.. > > git tree: upstream > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=3D11ab27cf980= 000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=3Dadffebefc9f= eb9d6 > > dashboard link: https://syzkaller.appspot.com/bug?extid=3D5250c4727db03= e3436cc > > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for= Debian) 2.40 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D1693d4045= 80000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D178ac94c580= 000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/8ecd2318067e/d= isk-a2cc6ff5.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/05691b82062c/vmli= nux-a2cc6ff5.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/4698994e99d4= /bzImage-a2cc6ff5.xz > > > > The issue was bisected to: > > > > commit d5c8aec0542e2d79b64de9089b88fabdebe05c1e > > Author: Lorenzo Stoakes > > Date: Mon Mar 10 20:50:37 2025 +0000 > > > > mm/mremap: initial refactor of move_vma() > > > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=3D11ff2a74= 580000 > > final oops: https://syzkaller.appspot.com/x/report.txt?x=3D13ff2a74= 580000 > > console output: https://syzkaller.appspot.com/x/log.txt?x=3D15ff2a74580= 000 > > > > IMPORTANT: if you fix the issue, please add the following tag to the co= mmit: > > Reported-by: syzbot+5250c4727db03e3436cc@syzkaller.appspotmail.com > > Fixes: d5c8aec0542e ("mm/mremap: initial refactor of move_vma()") > > > > Code: 48 83 c4 28 c3 e8 17 1a 00 00 0f 1f 80 00 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 > > RSP: 002b:00007fff0b8738c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 > > RAX: ffffffffffffffda RBX: 00007fff0b8738d0 RCX: 00007f46ffb182e9 > > RDX: 0000000000003000 RSI: 0000000000001000 RDI: 0000200000ffc000 > > RBP: 0000000000000001 R08: 0000200000ffa000 R09: 00007f46ffb80031 > > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f46ffb83618 > > R13: 00007fff0b873aa8 R14: 0000000000000001 R15: 0000000000000001 > > > > Oops: general protection fault, probably for non-canonical address 0xdf= fffc0000000004: 0000 [#1] SMP KASAN NOPTI > > KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] > > CPU: 0 UID: 0 PID: 5820 Comm: syz-executor115 Not tainted 6.14.0-syzkal= ler-12966-ga2cc6ff5ec8f #0 PREEMPT(full) > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS= Google 02/12/2025 > > RIP: 0010:vrm_uncharge mm/mremap.c:964 [inline] > > RIP: 0010:expand_vma_in_place mm/mremap.c:1566 [inline] > > RIP: 0010:expand_vma mm/mremap.c:1621 [inline] > > RIP: 0010:mremap_at mm/mremap.c:1682 [inline] > > RIP: 0010:do_mremap mm/mremap.c:1727 [inline] > > RIP: 0010:__do_sys_mremap+0x1392/0x15c0 mm/mremap.c:1784 > > Code: 0f 85 45 02 00 00 48 8b 04 24 c6 84 24 70 01 00 00 01 48 01 85 68= 02 00 00 eb 9a e8 18 34 af ff 48 b8 04 00 00 00 00 fc ff df <80> 38 00 0f = 85 a7 01 00 00 48 8b 2c 25 20 00 00 00 31 ff 81 e5 00 > > RSP: 0018:ffffc900039dfd20 EFLAGS: 00010293 > > RAX: dffffc0000000004 RBX: ffff88802b765a00 RCX: ffffffff821183c6 > > RDX: ffff88805c7b8000 RSI: ffffffff820c0cb8 RDI: 0000000000000005 > > RBP: ffff8880341fb780 R08: 0000000000000005 R09: 0000000000000000 > > R10: 00000000fffffff4 R11: 0000000000000001 R12: 0000000000002000 > > R13: 1ffff9200073bfaa R14: 0000200000ffc000 R15: ffff88802b765b70 > > FS: 00005555814db380(0000) GS:ffff8881249b8000(0000) knlGS:00000000000= 00000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007fff0b8728e0 CR3: 000000007802e000 CR4: 00000000003526f0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > Call Trace: > > > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > RIP: 0033:0x7f46ffb182e9 > > Code: 48 83 c4 28 c3 e8 17 1a 00 00 0f 1f 80 00 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 > > RSP: 002b:00007fff0b8738c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 > > RAX: ffffffffffffffda RBX: 00007fff0b8738d0 RCX: 00007f46ffb182e9 > > RDX: 0000000000003000 RSI: 0000000000001000 RDI: 0000200000ffc000 > > RBP: 0000000000000001 R08: 0000200000ffa000 R09: 00007f46ffb80031 > > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f46ffb83618 > > R13: 00007fff0b873aa8 R14: 0000000000000001 R15: 0000000000000001 > > > > Modules linked in: > > ---[ end trace 0000000000000000 ]--- > > RIP: 0010:vrm_uncharge mm/mremap.c:964 [inline] > > RIP: 0010:expand_vma_in_place mm/mremap.c:1566 [inline] > > RIP: 0010:expand_vma mm/mremap.c:1621 [inline] > > RIP: 0010:mremap_at mm/mremap.c:1682 [inline] > > RIP: 0010:do_mremap mm/mremap.c:1727 [inline] > > RIP: 0010:__do_sys_mremap+0x1392/0x15c0 mm/mremap.c:1784 > > Code: 0f 85 45 02 00 00 48 8b 04 24 c6 84 24 70 01 00 00 01 48 01 85 68= 02 00 00 eb 9a e8 18 34 af ff 48 b8 04 00 00 00 00 fc ff df <80> 38 00 0f = 85 a7 01 00 00 48 8b 2c 25 20 00 00 00 31 ff 81 e5 00 > > RSP: 0018:ffffc900039dfd20 EFLAGS: 00010293 > > RAX: dffffc0000000004 RBX: ffff88802b765a00 RCX: ffffffff821183c6 > > RDX: ffff88805c7b8000 RSI: ffffffff820c0cb8 RDI: 0000000000000005 > > RBP: ffff8880341fb780 R08: 0000000000000005 R09: 0000000000000000 > > R10: 00000000fffffff4 R11: 0000000000000001 R12: 0000000000002000 > > R13: 1ffff9200073bfaa R14: 0000200000ffc000 R15: ffff88802b765b70 > > FS: 00005555814db380(0000) GS:ffff8881249b8000(0000) knlGS:00000000000= 00000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007fff0b8728e0 CR3: 000000007802e000 CR4: 00000000003526f0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > ---------------- > > Code disassembly (best guess): > > 0: 48 83 c4 28 add $0x28,%rsp > > 4: c3 ret > > 5: e8 17 1a 00 00 call 0x1a21 > > a: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) > > 11: 48 89 f8 mov %rdi,%rax > > 14: 48 89 f7 mov %rsi,%rdi > > 17: 48 89 d6 mov %rdx,%rsi > > 1a: 48 89 ca mov %rcx,%rdx > > 1d: 4d 89 c2 mov %r8,%r10 > > 20: 4d 89 c8 mov %r9,%r8 > > 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 > > 28: 0f 05 syscall > > * 2a: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapp= ing instruction > > 30: 73 01 jae 0x33 > > 32: c3 ret > > 33: 48 c7 c1 b8 ff ff ff mov $0xffffffffffffffb8,%rcx > > 3a: f7 d8 neg %eax > > 3c: 64 89 01 mov %eax,%fs:(%rcx) > > 3f: 48 rex.W > > > > > > --- > > 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. > > For information about bisection process see: https://goo.gl/tpsmEJ#bise= ction > > > > If the report is already addressed, let syzbot know by replying with: > > #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 testing= . > > > > 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 > > --