general protection fault in anon_vma_interval_tree

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	general protection fault in anon_vma_interval_tree_verify (2) mm				1	1307d	1303d	0/26	auto-closed as invalid on 2020/12/17 11:34
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 26177 Comm: syz-executor.4 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:avc_start_pgoff mm/interval_tree.c:63 [inline]
RIP: 0010:anon_vma_interval_tree_verify+0x6d/0x190 mm/interval_tree.c:108
Code: 48 c1 ea 03 80 3c 02 00 0f 85 13 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 8d bc 24 98 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e3 00 00 00 4d 8b ac 24 98 00 00 00 4c 89 f7 4c
RSP: 0018:ffffc9000810fac8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880a93730a8 RCX: ffffffff81a037e2
RDX: 0000000000000013 RSI: ffffffff81a036e3 RDI: 0000000000000098
RBP: ffffc9000810fae8 R08: ffff888201828380 R09: ffffed1013ab8c7b
R10: ffffed1013ab8c7a R11: ffff88809d5c63d7 R12: 0000000000000000
R13: ffff8880a7d69078 R14: 0000000000000000 R15: ffff8880a93730a8
FS:  000000000192c940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000075bf24 CR3: 0000000219761000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 validate_mm+0x107/0x620 mm/mmap.c:403
 vma_link+0x114/0x170 mm/mmap.c:660
 mmap_region+0x1297/0x1760 mm/mmap.c:1801
 do_mmap+0x837/0x1150 mm/mmap.c:1549
 do_mmap_pgoff include/linux/mm.h:2338 [inline]
 vm_mmap_pgoff+0x1c5/0x230 mm/util.c:506
 ksys_mmap_pgoff+0xf7/0x630 mm/mmap.c:1601
 __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+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45af9a
Code: 89 f5 41 54 49 89 fc 55 53 74 35 49 63 e8 48 63 da 4d 89 f9 49 89 e8 4d 63 d6 48 89 da 4c 89 ee 4c 89 e7 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 4e 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 00
RSP: 002b:00007ffcfb663fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af9a
RDX: 0000000000000003 RSI: 0000000000021000 RDI: 0000000000000000
RBP: ffffffffffffffff R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000020022 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000021000 R14: 0000000000020022 R15: 0000000000000000
Modules linked in:
---[ end trace e1216cdf4b480e30 ]---
RIP: 0010:avc_start_pgoff mm/interval_tree.c:63 [inline]
RIP: 0010:anon_vma_interval_tree_verify+0x6d/0x190 mm/interval_tree.c:108
Code: 48 c1 ea 03 80 3c 02 00 0f 85 13 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 8d bc 24 98 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e3 00 00 00 4d 8b ac 24 98 00 00 00 4c 89 f7 4c
RSP: 0018:ffffc9000810fac8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880a93730a8 RCX: ffffffff81a037e2
RDX: 0000000000000013 RSI: ffffffff81a036e3 RDI: 0000000000000098
RBP: ffffc9000810fae8 R08: ffff888201828380 R09: ffffed1013ab8c7b
R10: ffffed1013ab8c7a R11: ffff88809d5c63d7 R12: 0000000000000000
R13: ffff8880a7d69078 R14: 0000000000000000 R15: ffff8880a93730a8
FS:  000000000192c940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000075bf24 CR3: 0000000219761000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400