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Message-ID: <672c72e7.050a0220.31356.0002.GAE@google.com> Date: Wed, 06 Nov 2024 23:57:27 -0800 From: syzbot <syzbot+16b1da89309a06cd0e3a@...kaller.appspotmail.com> To: bp@...en8.de, dave.hansen@...ux.intel.com, guohui.study@...il.com, hpa@...or.com, linux-kernel@...r.kernel.org, luto@...nel.org, mingo@...hat.com, peterz@...radead.org, syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org Subject: Re: [syzbot] [kernel?] WARNING in get_pat_info syzbot has found a reproducer for the following issue on: HEAD commit: 7758b206117d Merge tag 'tracefs-v6.12-rc6' of git://git.ke.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=10f6bd5f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=921b01cbfd887a9b dashboard link: https://syzkaller.appspot.com/bug?extid=16b1da89309a06cd0e3a compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=148adf40580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1704ae30580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4535eeeccbd4/disk-7758b206.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f7f34cce38f1/vmlinux-7758b206.xz kernel image: https://storage.googleapis.com/syzbot-assets/626c3346b3bd/bzImage-7758b206.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+16b1da89309a06cd0e3a@...kaller.appspotmail.com Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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:00007ffccfb961e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fc6265e02e9 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ff6000 RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000013 R11: 0000000000000246 R12: 00007fc626624153 R13: 00007ffccfb96260 R14: 00007fc62662a29c R15: 00007fc626624032 </TASK> ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5831 at arch/x86/mm/pat/memtype.c:983 get_pat_info+0x1eb/0x3f0 arch/x86/mm/pat/memtype.c:983 Modules linked in: CPU: 0 UID: 0 PID: 5831 Comm: syz-executor181 Not tainted 6.12.0-rc6-syzkaller-00099-g7758b206117d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:get_pat_info+0x1eb/0x3f0 arch/x86/mm/pat/memtype.c:983 Code: 00 00 00 48 89 de e8 c4 e0 50 00 48 83 fb 20 75 13 48 83 7c 24 10 00 0f 84 5e 01 00 00 e8 cd db 50 00 eb 09 e8 c6 db 50 00 90 <0f> 0b 90 b8 ea ff ff ff 48 c7 44 24 20 0e 36 e0 45 48 b9 00 00 00 RSP: 0018:ffffc90003e37020 EFLAGS: 00010293 RAX: ffffffff8143fe3a RBX: 0000000000000000 RCX: ffff88807c4d9e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020 RBP: ffffc90003e37110 R08: ffffffff8143fe1c R09: 1ffffffff2037b8d R10: dffffc0000000000 R11: fffffbfff2037b8e R12: 1ffff920007c6e08 R13: 1ffff1100f973597 R14: ffffc90003e37060 R15: ffff88807cb9ac98 FS: 0000555586d8f480(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 0000000033636000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> untrack_pfn+0x327/0x640 arch/x86/mm/pat/memtype.c:1085 unmap_single_vma+0x1f6/0x2b0 mm/memory.c:1834 zap_page_range_single+0x45c/0x630 mm/memory.c:1935 remap_pfn_range_notrack+0xc8e/0xe10 mm/memory.c:2708 remap_pfn_range+0x12c/0x1b0 mm/memory.c:2733 usbdev_mmap+0x4ba/0x900 drivers/usb/core/devio.c:276 call_mmap include/linux/fs.h:2172 [inline] mmap_region+0x1689/0x2940 mm/mmap.c:1450 do_mmap+0x8f0/0x1000 mm/mmap.c:496 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc6265e02e9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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:00007ffccfb961e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fc6265e02e9 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ff6000 RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000013 R11: 0000000000000246 R12: 00007fc626624153 R13: 00007ffccfb96260 R14: 00007fc62662a29c R15: 00007fc626624032 </TASK> ---------------- Code disassembly (best guess): 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 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 <-- trapping 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 --- 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.
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