KASAN: stack-out-of-bounds Write in __tlb_remove_page_size

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 8ae71e76cf1f Merge branch 'bpf-offload-sharing'
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1775bf0c400000
kernel config: https://syzkaller.appspot.com/x/.config?x=89129667b46496c3
dashboard link: https://syzkaller.appspot.com/bug?extid=272b26875d5276d885ee
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [ak...@linux-foundation.org dan.j.w...@intel.com
jgl...@redhat.com kirill....@linux.intel.com
ldu...@linux.vnet.ibm.com linux-...@vger.kernel.org linu...@kvack.org
mho...@suse.com min...@kernel.org ross.z...@linux.intel.com
wi...@infradead.org ying....@intel.com]

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+272b26...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: stack-out-of-bounds in __tlb_remove_page_size+0x448/0x500
mm/memory.c:314
PANIC: double fault, error_code: 0x0
Write of size 8 at addr ffff88019ad6c7a8 by task syz-executor1/11392
CPU: 1 PID: 11378 Comm: syz-executor0 Not tainted 4.18.0-rc3+ #58

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__lock_acquire+0x2e/0x5020 kernel/locking/lockdep.c:3294
CPU: 0 PID: 11392 Comm: syz-executor1 Not tainted 4.18.0-rc3+ #58
Code: 41
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
57 41
Call Trace:
89 cf
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
41 56
41 55
49 89
fd 41
54
print_address_description+0x6c/0x20b mm/kasan/report.c:256
45 89
cc 53
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
65
__asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:438
4c 8b
__tlb_remove_page_size+0x448/0x500 mm/memory.c:314
34 25
__tlb_remove_page include/asm-generic/tlb.h:150 [inline]
zap_pte_range mm/memory.c:1336 [inline]
zap_pmd_range mm/memory.c:1437 [inline]
zap_pud_range mm/memory.c:1466 [inline]
zap_p4d_range mm/memory.c:1487 [inline]
unmap_page_range+0x1059/0x2220 mm/memory.c:1508
40 ee
01 00
48 83
e4 f0
48
81 ec
60 03
00 00
48 8b
45 10
<89> 94
24 80
00 00
00 48
ba 00
00
00
00 00
fc ff
unmap_single_vma+0x1a0/0x310 mm/memory.c:1553
df 48
unmap_vmas+0x120/0x1f0 mm/memory.c:1583
89 84
exit_mmap+0x2c2/0x5b0 mm/mmap.c:3105
24 98
RSP: 0018:ffff88019a0e2db0 EFLAGS: 00010082
__mmput kernel/fork.c:970 [inline]
mmput+0x265/0x620 kernel/fork.c:991
RAX: 0000000000000000 RBX: 1ffff1003341c633 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
RBP: ffff88019a0e3140 R08: 0000000000000000 R09: 0000000000000000
R10: ffff88019af0fbe0 R11: ffff8801c7200a3b R12: 0000000000000000
R13: ffffffff88f92620 R14: ffff8801c72002c0 R15: 0000000000000002
FS: 00000000020ac940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88019a0e2da8 CR3: 00000001b0815000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:


---
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[Dmitry Vyukov]

Looks like the bpf map bug:
#syz fix: bpf: sockhash, disallow bpf_tcp_close and update in parallel

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