BUG: unable to handle kernel paging request in free

BUG: unable to handle kernel paging request in free_block
Status: upstream: reported on 2020/07/21 03:09
Reported-by: syzbot+aa8165e574f7da5a0f90@syzkaller.appspotmail.com
First crash: 63d, last: 63d

similar bugs (4):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
upstream	BUG: unable to handle kernel paging request in free_block (4)			2	587d	617d	0/17	closed as dup on 2019/01/14 17:27
upstream	BUG: unable to handle kernel paging request in free_block (3)			11	879d	908d	0/17	closed as invalid on 2018/09/05 11:23
upstream	BUG: unable to handle kernel paging request in free_block (2)			1	916d	916d	0/17	closed as invalid on 2018/03/21 12:59
upstream	BUG: unable to handle kernel paging request in free_block (5)	syz	cause+fix	3	124d	523d	0/17	upstream: reported syz repro on 2019/04/18 05:08

Sample crash report:

netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'.
BUG: unable to handle kernel paging request at ffffffff00000101
PGD 8c70067 P4D 8c70067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 24796 Comm: kworker/0:5 Not tainted 4.19.133-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
IPVS: Unknown mcast interface: rose0
Workqueue: events cache_reap
RIP: 0010:__list_del_entry_valid+0x87/0xef lib/list_debug.c:51
Code: 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 e0 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 75 51 <49> 8b 14 24 48 39 ea 0f 85 97 00 00 00 49 8d 7d 08 48 b8 00 00 00
RSP: 0018:ffff888214b07c08 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffffe8ffffc11488 RCX: ffffffffffffffff
RDX: 1fffffffe0000020 RSI: ffffffff8130ec6a RDI: ffffea0000004550
RBP: ffffea0000004548 R08: 0000000000004540 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: ffffffff00000101
R13: 0000000000000000 R14: ffffea0000004540 R15: ffff8880a6718000
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000101 CR3: 0000000094422000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del include/linux/list.h:125 [inline]
 free_block+0xd3/0x230 mm/slab.c:3421
 drain_array_locked+0x30/0x80 mm/slab.c:2213
 drain_array+0x80/0xa0 mm/slab.c:4027
 cache_reap+0x150/0x270 mm/slab.c:4068
 process_one_work+0x864/0x1570 kernel/workqueue.c:2155
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
 kthread+0x30b/0x410 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
CR2: ffffffff00000101
---[ end trace 22d253f6a885d5ce ]---
RIP: 0010:__list_del_entry_valid+0x87/0xef lib/list_debug.c:51
Code: 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 e0 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 75 51 <49> 8b 14 24 48 39 ea 0f 85 97 00 00 00 49 8d 7d 08 48 b8 00 00 00
RSP: 0018:ffff888214b07c08 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffffe8ffffc11488 RCX: ffffffffffffffff
RDX: 1fffffffe0000020 RSI: ffffffff8130ec6a RDI: ffffea0000004550
RBP: ffffea0000004548 R08: 0000000000004540 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: ffffffff00000101
R13: 0000000000000000 R14: ffffea0000004540 R15: ffff8880a6718000
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000101 CR3: 0000000094422000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci2-linux-4-19	2020/07/21 03:08	linux-4.19.y	17a87580	d88894e6	.config	log	report				akpm@osdl.org, keescook@chromium.org, linux-kernel@vger.kernel.org, paul.gortmaker@windriver.com, paulmck@linux.vnet.ibm.com, riel@redhat.com