syzbot

general protection fault, probably for non-canonical address 0xdffffc000901f7ce: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x00000000480fbe70-0x00000000480fbe77]
CPU: 1 PID: 3173 Comm: systemd-udevd Not tainted 5.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:956 [inline]
RIP: 0010:debug_check_no_obj_freed+0x1d3/0x41c lib/debugobjects.c:998
Code: 39 00 0f 85 0f 02 00 00 48 89 45 08 4d 89 30 4c 89 c7 4d 89 68 08 e8 bc c9 ff ff 48 85 ed 74 2c 49 89 e8 4c 89 c0 48 c1 e8 03 <42> 80 3c 38 00 0f 84 2e ff ff ff 4c 89 c7 4c 89 44 24 38 e8 c5 31
RSP: 0018:ffffc90015d3fa20 EFLAGS: 00010002
RAX: 000000000901f7ce RBX: ffff888213307000 RCX: ffffffff815cf7b0
RDX: 1ffffffff1ad54cc RSI: 0000000000000004 RDI: ffff88800013db40
RBP: 00000000480fbe70 R08: 00000000480fbe70 R09: ffff88804cf752d8
R10: fffff52002ba7f32 R11: 0000000000000000 R12: 0000000000000004
R13: dead000000000122 R14: dead000000000100 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056372ae8e160 CR3: 000000009271c000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 free_pages_prepare mm/page_alloc.c:1214 [inline]
 free_pcp_prepare+0x1f3/0x2f0 mm/page_alloc.c:1244
 free_unref_page_prepare mm/page_alloc.c:3099 [inline]
 free_unref_page_list+0x19a/0x930 mm/page_alloc.c:3168
 release_pages+0x663/0x1810 mm/swap.c:913
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
 tlb_flush_mmu mm/mmu_gather.c:249 [inline]
 tlb_finish_mmu+0x165/0x8c0 mm/mmu_gather.c:328
 exit_mmap+0x2d1/0x530 mm/mmap.c:3185
 __mmput+0x122/0x470 kernel/fork.c:1076
 mmput+0x53/0x60 kernel/fork.c:1097
 exit_mm kernel/exit.c:483 [inline]
 do_exit+0xa8b/0x29f0 kernel/exit.c:793
 do_group_exit+0x125/0x310 kernel/exit.c:903
 __do_sys_exit_group kernel/exit.c:914 [inline]
 __se_sys_exit_group kernel/exit.c:912 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:912
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f93e9239618
Code: Bad RIP value.
RSP: 002b:00007ffe83539b98 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007ffe83539c60 RCX: 00007f93e9239618
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00007ffe83539d10 R08: 00000000000000e7 R09: fffffffffffffe50
R10: 00000000ffffffff R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000003 R15: 000000000000000e
Modules linked in:
---[ end trace 59ba9df4d7884c1c ]---
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:956 [inline]
RIP: 0010:debug_check_no_obj_freed+0x1d3/0x41c lib/debugobjects.c:998
Code: 39 00 0f 85 0f 02 00 00 48 89 45 08 4d 89 30 4c 89 c7 4d 89 68 08 e8 bc c9 ff ff 48 85 ed 74 2c 49 89 e8 4c 89 c0 48 c1 e8 03 <42> 80 3c 38 00 0f 84 2e ff ff ff 4c 89 c7 4c 89 44 24 38 e8 c5 31
RSP: 0018:ffffc90015d3fa20 EFLAGS: 00010002
RAX: 000000000901f7ce RBX: ffff888213307000 RCX: ffffffff815cf7b0
RDX: 1ffffffff1ad54cc RSI: 0000000000000004 RDI: ffff88800013db40
RBP: 00000000480fbe70 R08: 00000000480fbe70 R09: ffff88804cf752d8
R10: fffff52002ba7f32 R11: 0000000000000000 R12: 0000000000000004
R13: dead000000000122 R14: dead000000000100 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056372ae8e160 CR3: 000000009271c000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400