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Message-ID: <66fbc2d9.050a0220.6bad9.0057.GAE@google.com> Date: Tue, 01 Oct 2024 02:37:29 -0700 From: syzbot <syzbot+093d096417e7038a689b@...kaller.appspotmail.com> To: bp@...en8.de, dave.hansen@...ux.intel.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: [syzbot] [kernel?] general protection fault in follow_pfnmap_start Hello, syzbot found the following issue on: HEAD commit: 075dbe9f6e3c Merge tag 'soc-ep93xx-dt-6.12' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17945e27980000 kernel config: https://syzkaller.appspot.com/x/.config?x=b2d4fdf18a83ec0b dashboard link: https://syzkaller.appspot.com/bug?extid=093d096417e7038a689b 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=145dba80580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1703159f980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-075dbe9f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9c02adb371c0/vmlinux-075dbe9f.xz kernel image: https://storage.googleapis.com/syzbot-assets/5e56aa110f69/bzImage-075dbe9f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+093d096417e7038a689b@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f] CPU: 0 UID: 0 PID: 5102 Comm: syz-executor119 Not tainted 6.11.0-syzkaller-11558-g075dbe9f6e3c #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:pfnmap_lockdep_assert mm/memory.c:6349 [inline] RIP: 0010:follow_pfnmap_start+0x1a7/0xfd0 mm/memory.c:6402 Code: 8d 9f 80 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 57 0c 1a 00 48 8b 1b 48 83 c3 58 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 3a 0c 1a 00 4c 8b 23 48 c7 c0 7c RSP: 0018:ffffc9000179f100 EFLAGS: 00010202 RAX: 000000000000000b RBX: 0000000000000058 RCX: ffff88801aa0c880 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000179f1e0 RBP: ffffc9000179f290 R08: ffffc9000179f311 R09: 0000000000000000 R10: ffffc9000179f2f0 R11: fffff520002f3e63 R12: dffffc0000000000 R13: 1ffff110023c0202 R14: ffffc9000179f2e0 R15: ffff888011e01000 FS: 0000555593c58380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9ad1af10f0 CR3: 000000001270e000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> follow_phys arch/x86/mm/pat/memtype.c:956 [inline] get_pat_info+0x182/0x3f0 arch/x86/mm/pat/memtype.c:988 untrack_pfn+0x327/0x640 arch/x86/mm/pat/memtype.c:1101 unmap_single_vma+0x1f6/0x2b0 mm/memory.c:1834 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1900 unmap_region+0x214/0x380 mm/vma.c:354 mmap_region+0x22f9/0x2990 mm/mmap.c:1573 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: 0033:0x7f9ad1a7a879 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd49b2ee58 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9ad1a7a879 RDX: 0000000000000007 RSI: 0000000000005000 RDI: 0000000020371000 RBP: 00007f9ad1aed5f0 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000001 R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:pfnmap_lockdep_assert mm/memory.c:6349 [inline] RIP: 0010:follow_pfnmap_start+0x1a7/0xfd0 mm/memory.c:6402 Code: 8d 9f 80 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 57 0c 1a 00 48 8b 1b 48 83 c3 58 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 3a 0c 1a 00 4c 8b 23 48 c7 c0 7c RSP: 0018:ffffc9000179f100 EFLAGS: 00010202 RAX: 000000000000000b RBX: 0000000000000058 RCX: ffff88801aa0c880 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000179f1e0 RBP: ffffc9000179f290 R08: ffffc9000179f311 R09: 0000000000000000 R10: ffffc9000179f2f0 R11: fffff520002f3e63 R12: dffffc0000000000 R13: 1ffff110023c0202 R14: ffffc9000179f2e0 R15: ffff888011e01000 FS: 0000555593c58380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555593c58ca8 CR3: 000000001270e000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8d 9f 80 00 00 00 lea 0x80(%rdi),%ebx 6: 48 89 d8 mov %rbx,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 57 0c 1a 00 call 0x1a0c73 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 58 add $0x58,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 3a 0c 1a 00 call 0x1a0c73 39: 4c 8b 23 mov (%rbx),%r12 3c: 48 rex.W 3d: c7 .byte 0xc7 3e: c0 .byte 0xc0 3f: 7c .byte 0x7c --- 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@...glegroups.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 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
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