[syzbot] [mm?] general protection fault in mt_validate

From: syzbot
Date: Sat Jul 01 2023 - 21:26:13 EST

Hello,

syzbot found the following issue on:

HEAD commit: f8566aa4f176 Merge tag 'x86-urgent-2023-07-01' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1776ecb8a80000
kernel config: https://syzkaller.appspot.com/x/.config?x=7406f415f386e786
dashboard link: https://syzkaller.appspot.com/bug?extid=6c0c8f9846801f6fbec0
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=131e8548a80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=141ca8b8a80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/afab0dafcce3/disk-f8566aa4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6b77678d9c2a/vmlinux-f8566aa4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ec2a20a04171/bzImage-f8566aa4.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/1bd3a6492d61/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6c0c8f9846801f6fbec0@xxxxxxxxxxxxxxxxxxxxxxxxx

RSP: 002b:00007f2c3f367168 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f2c3f3bb9d7
RDX: 0000000000008000 RSI: 0000000000008000 RDI: 00007f2c36f26000
RBP: 00007f2c36f26000 R08: 0000000000000000 R09: 0000000000000280
R10: 0000000000008000 R11: 0000000000000246 R12: 00007f2c3f3676b8
R13: 00007f2c3f367180 R14: 00007f2c3f3671c0 R15: 00007f2c3f4407a8
</TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 5347 Comm: syz-executor152 Not tainted 6.4.0-syzkaller-10062-gf8566aa4f176 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:mas_validate_gaps lib/maple_tree.c:7002 [inline]
RIP: 0010:mt_validate+0x32ac/0x4370 lib/maple_tree.c:7224
Code: 89 ee e8 97 18 77 f7 49 83 fd 06 0f 84 a6 06 00 00 e8 48 1c 77 f7 49 01 de 48 ba 00 00 00 00 00 fc ff df 4c 89 f0 48 c1 e8 03 <80> 3c 10 00 0f 85 4b 10 00 00 4d 8b 2e 4c 89 ff 4c 89 ee e8 dc 17
RSP: 0018:ffffc9000423f940 EFLAGS: 00010256
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8a0db288 RDI: 0000000000000007
RBP: ffff888028b33600 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888028b33600 R14: 0000000000000000 R15: ffff800216450000
FS: 00007f2c3f367700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c3f3fd000 CR3: 0000000015ff7000 CR4: 0000000000350ef0
Call Trace:
<TASK>
validate_mm+0x9d/0x470 mm/mmap.c:300
do_vmi_align_munmap+0x1199/0x1680 mm/mmap.c:2561
do_vmi_munmap+0x266/0x430 mm/mmap.c:2619
__vm_munmap+0x137/0x380 mm/mmap.c:2899
__do_sys_munmap mm/mmap.c:2916 [inline]
__se_sys_munmap mm/mmap.c:2913 [inline]
__x64_sys_munmap+0x62/0x80 mm/mmap.c:2913
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2c3f3bb9d7
Code: 00 00 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb 85 66 2e 0f 1f 84 00 00 00 00 00 90 b8 0b 00 00 00 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:00007f2c3f367168 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f2c3f3bb9d7
RDX: 0000000000008000 RSI: 0000000000008000 RDI: 00007f2c36f26000
RBP: 00007f2c36f26000 R08: 0000000000000000 R09: 0000000000000280
R10: 0000000000008000 R11: 0000000000000246 R12: 00007f2c3f3676b8
R13: 00007f2c3f367180 R14: 00007f2c3f3671c0 R15: 00007f2c3f4407a8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:mas_validate_gaps lib/maple_tree.c:7002 [inline]
RIP: 0010:mt_validate+0x32ac/0x4370 lib/maple_tree.c:7224
Code: 89 ee e8 97 18 77 f7 49 83 fd 06 0f 84 a6 06 00 00 e8 48 1c 77 f7 49 01 de 48 ba 00 00 00 00 00 fc ff df 4c 89 f0 48 c1 e8 03 <80> 3c 10 00 0f 85 4b 10 00 00 4d 8b 2e 4c 89 ff 4c 89 ee e8 dc 17
RSP: 0018:ffffc9000423f940 EFLAGS: 00010256
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8a0db288 RDI: 0000000000000007
RBP: ffff888028b33600 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888028b33600 R14: 0000000000000000 R15: ffff800216450000
FS: 00007f2c3f367700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c3f3fd000 CR3: 0000000015ff7000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: 89 ee mov %ebp,%esi
2: e8 97 18 77 f7 callq 0xf777189e
7: 49 83 fd 06 cmp $0x6,%r13
b: 0f 84 a6 06 00 00 je 0x6b7
11: e8 48 1c 77 f7 callq 0xf7771c5e
16: 49 01 de add %rbx,%r14
19: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
20: fc ff df
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction
2e: 0f 85 4b 10 00 00 jne 0x107f
34: 4d 8b 2e mov (%r14),%r13
37: 4c 89 ff mov %r15,%rdi
3a: 4c 89 ee mov %r13,%rsi
3d: e8 .byte 0xe8
3e: dc 17 fcoml (%rdi)


---
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