flags: 0x2fffc0000000000()
raw: 02fffc0000000000 ffffea000659a801 dead000000000200 dead000000000400
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: VM_BUG_ON_PAGE(PageSlab(page))
------------[ cut here ]------------
kernel BUG at include/linux/mm.h:631!
invalid opcode: 0000 [#1] SMP KASAN
CPU: 0 PID: 18992 Comm: syz-executor5 Not tainted 4.19.0-rc2+ #220
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:page_mapcount include/linux/mm.h:631 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1339 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1440 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1469 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1490 [inline]
RIP: 0010:unmap_page_range+0x1b0a/0x2560 mm/memory.c:1511
Code: ff e8 8a d2 cf ff 48 8b 85 d8 fb ff ff 4c 8d 68 ff e9 13 f1 ff ff e8 75 d2 cf ff 48 c7 c6 20 1f 32 87 4c 89 e7 e8 86 73 fe ff <0f> 0b e8 5f d2 cf ff 48 8b bd 70 fc ff ff e8 f3 40 04 00 e9 4f f7
RSP: 0018:ffff8801953570f8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000020ff1000 RCX: 0000000000000000
RDX: 000000000000a634 RSI: ffffffff81ab81f5 RDI: ffffed0032a6ae10
RBP: ffff880195357558 R08: ffff88013ccac340 R09: 0000000000000006
R10: ffff88013ccac340 R11: 0000000000000000 R12: ffffea000659a880
R13: 0000000000000100 R14: dffffc0000000000 R15: ffff8801ca5b4f80
FS:  00007fb81e768700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb81e746db8 CR3: 000000016b7bf000 CR4: 00000000001426f0
Call Trace:
 unmap_single_vma+0x1a0/0x310 mm/memory.c:1556
 unmap_vmas+0x125/0x200 mm/memory.c:1586
 unmap_region+0x353/0x570 mm/mmap.c:2571
 do_munmap+0x617/0xf60 mm/mmap.c:2781
 mmap_region+0x78a/0x1c50 mm/mmap.c:1705
 do_mmap+0xa10/0x1220 mm/mmap.c:1535
 do_mmap_pgoff include/linux/mm.h:2298 [inline]
 vm_mmap_pgoff+0x213/0x2c0 mm/util.c:357
 ksys_mmap_pgoff+0x4da/0x660 mm/mmap.c:1585
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb81e767c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fb81e7686d4 RCX: 0000000000457099
RDX: 0000000000000000 RSI: 0000000000010000 RDI: 0000000020ff0000
RBP: 0000000000930140 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000011011 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d2e08 R14: 00000000004c7f13 R15: 0000000000000001
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 51b070dccfc8b4c3 ]---
RIP: 0010:page_mapcount include/linux/mm.h:631 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1339 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1440 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1469 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1490 [inline]
RIP: 0010:unmap_page_range+0x1b0a/0x2560 mm/memory.c:1511
Code: ff e8 8a d2 cf ff 48 8b 85 d8 fb ff ff 4c 8d 68 ff e9 13 f1 ff ff e8 75 d2 cf ff 48 c7 c6 20 1f 32 87 4c 89 e7 e8 86 73 fe ff <0f> 0b e8 5f d2 cf ff 48 8b bd 70 fc ff ff e8 f3 40 04 00 e9 4f f7
syz_tun: mtu greater than device maximum
RSP: 0018:ffff8801953570f8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000020ff1000 RCX: 0000000000000000
RDX: 000000000000a634 RSI: ffffffff81ab81f5 RDI: ffffed0032a6ae10
RBP: ffff880195357558 R08: ffff88013ccac340 R09: 0000000000000006
R10: ffff88013ccac340 R11: 0000000000000000 R12: ffffea000659a880
R13: 0000000000000100 R14: dffffc0000000000 R15: ffff8801ca5b4f80
FS:  00007fb81e768700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb81e746db8 CR3: 000000016b7bf000 CR4: 00000000001426f0