list_add corruption. next->prev should be prev (ffff88021fffab78), but was ffffea000ac0ad20. (next=ffffea000b055320).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:25!
invalid opcode: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 19525 Comm: udevd Not tainted 4.17.0-rc5+ #102
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_add_valid+0x275/0x450 lib/list_debug.c:23
RSP: 0018:ffff88017696f288 EFLAGS: 00010082
RAX: 0000000000000075 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88021fd36eec
RBP: ffff88017696f2f0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffea000b055320
R13: ffffea000ac0ad20 R14: 0000000000000000 R15: ffffffff8b58b000
FS:  00007f4ebfb597a0(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000a3eab8 CR3: 000000013e4bc000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __list_add include/linux/list.h:60 [inline]
 list_add include/linux/list.h:79 [inline]
 __free_one_page+0x1483/0x1800 mm/page_alloc.c:876
 free_one_page mm/page_alloc.c:1176 [inline]
 __free_pages_ok+0x87f/0x16c0 mm/page_alloc.c:1260
 __free_pages+0x109/0x240 mm/page_alloc.c:4442
 kmsan_free_page+0x1b6/0x2e0 mm/kmsan/kmsan.c:959
 free_pages_prepare mm/page_alloc.c:996 [inline]
 __free_pages_ok+0x270/0x16c0 mm/page_alloc.c:1254
 __free_pages mm/page_alloc.c:4442 [inline]
 free_pages+0x1e7/0x320 mm/page_alloc.c:4452
 _pgd_free arch/x86/mm/pgtable.c:367 [inline]
 pgd_free+0x2b2/0x360 arch/x86/mm/pgtable.c:416
 mm_free_pgd kernel/fork.c:551 [inline]
 __mmdrop+0x139/0x930 kernel/fork.c:599
 mmdrop include/linux/sched/mm.h:49 [inline]
 __mmput+0x550/0x600 kernel/fork.c:972
 mmput+0xab/0xf0 kernel/fork.c:983
 exit_mm+0x6ed/0x7a0 kernel/exit.c:545
 do_exit+0xc01/0x38d0 kernel/exit.c:854
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 get_signal+0xfcb/0x1f40 kernel/signal.c:2482
 do_signal+0xb8/0x1cf0 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196
 retint_user+0x8/0x8
RIP: 0033:0x7f4ebf95a890
RSP: 002b:00007ffe8c748a58 EFLAGS: 00010206
RAX: 0000000000000002 RBX: 00007f4ebf19ae20 RCX: 0000000000000000
RDX: 0000000000000467 RSI: 0000000000401a69 RDI: 00007f4ebf1a29de
RBP: 00007f4ebfb5b058 R08: 0000000003f0b27f R09: 0000000000000005
R10: 00007ffe8c748af0 R11: 00007ffe8c748af0 R12: 0000000000000007
R13: 00000000fc2c9fc5 R14: 0000000000000003 R15: 00007ffe8c748c78
Code: 87 80 0c 00 00 00 00 00 00 41 c7 87 20 03 00 00 00 00 00 00 48 c7 c7 d4 77 a5 8a 31 c0 48 89 d6 4c 89 ea 4c 89 e1 e8 5b 7d 42 fd <0f> 0b 66 0f 1f 84 00 00 00 00 00 eb fe 48 8b 7d c8 e8 45 aa bf 
RIP: __list_add_valid+0x275/0x450 lib/list_debug.c:23 RSP: ffff88017696f288
---[ end trace af22b07f69c58bf8 ]---