KASAN: stack-out-of-bounds Read in debug_check_no_obj_freed (4)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: d90c936fb318 Merge branch 'bpf-nfp-mul-div-support'
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1041e968400000
kernel config: https://syzkaller.appspot.com/x/.config?x=a501a01deaf0fe9
dashboard link: https://syzkaller.appspot.com/bug?extid=d3a124dbc2934b098eba
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [aarc...@redhat.com ak...@linux-foundation.org
dan.j.w...@intel.com dw...@amazon.co.uk jrdr....@gmail.com
linux-...@vger.kernel.org linu...@kvack.org mho...@suse.com
ol...@redhat.com rien...@google.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+d3a124...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: stack-out-of-bounds in __debug_check_no_obj_freed
lib/debugobjects.c:775 [inline]
BUG: KASAN: stack-out-of-bounds in debug_check_no_obj_freed+0x467/0x595
lib/debugobjects.c:815
Read of size 8 at addr ffff8801bf2c00a8 by task blkid/17346

CPU: 1 PID: 17346 Comm: blkid Not tainted 4.18.0-rc3+ #48
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
PANIC: double fault, error_code: 0x0
print_address_description+0x6c/0x20b mm/kasan/report.c:256
CPU: 0 PID: 17324 Comm: syz-executor4 Not tainted 4.18.0-rc3+ #48
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
RIP: 0010:__lock_acquire+0x2e/0x5020 kernel/locking/lockdep.c:3294
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
Code:
__debug_check_no_obj_freed lib/debugobjects.c:775 [inline]
debug_check_no_obj_freed+0x467/0x595 lib/debugobjects.c:815
41 57
41
89
kmem_cache_free+0x216/0x2d0 mm/slab.c:3755
cf 41
remove_vma+0x164/0x1b0 mm/mmap.c:185
56
exit_mmap+0x365/0x5b0 mm/mmap.c:3116
41
55
__mmput kernel/fork.c:970 [inline]
mmput+0x265/0x620 kernel/fork.c:991
49
89
fd
41
54
45 89
cc
53 65
exit_mm kernel/exit.c:544 [inline]
do_exit+0xea9/0x2750 kernel/exit.c:852
4c
8b
34
25
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 df
48
89
84
24 98
RSP: 0018:ffff8801b8dffe90 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 1ffff100371c004e RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
RBP: ffff8801b8e00218 R08: 0000000000000000 R09: 0000000000000000
do_group_exit+0x177/0x440 kernel/exit.c:968
R10: ffff8801bf3ff1b8 R11: ffff8801dae236b3 R12: 0000000000000000
R13: ffffffff88f92620 R14: ffff8801c9f36040 R15: 0000000000000002
FS: 00007fce9fb05700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801b8dffe88 CR3: 00000001ccf70000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000
get_signal+0x88e/0x1970 kernel/signal.c:2468
DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:


---
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[Dmitry Vyukov]

#syz invalid

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