list_del corruption. prev->next should be ffff8880001086a0, but was f000ff53f000ff53 ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:51! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 19195 Comm: systemd-udevd Not tainted 5.9.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid.cold+0xf/0x55 lib/list_debug.c:51 Code: e8 5a b1 b9 fd 0f 0b 48 89 f1 48 c7 c7 80 be b4 88 4c 89 e6 e8 46 b1 b9 fd 0f 0b 48 89 ee 48 c7 c7 20 c0 b4 88 e8 35 b1 b9 fd <0f> 0b 4c 89 ea 48 89 ee 48 c7 c7 60 bf b4 88 e8 21 b1 b9 fd 0f 0b RSP: 0018:ffffc90015d0fbb0 EFLAGS: 00010286 RAX: 0000000000000054 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff88801ceee000 RSI: ffffffff815f5a85 RDI: fffff52002ba1f68 RBP: ffff8880001086a0 R08: 0000000000000054 R09: ffff8880ae6318e7 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000000000 R13: ffff88809f986de0 R14: ffff888097377e00 R15: ffff8880001086a0 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020012030 CR3: 0000000092fc4000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:132 [inline] list_del include/linux/list.h:146 [inline] unlink_anon_vmas+0xa3/0x830 mm/rmap.c:413 free_pgtables+0x1ab/0x2f0 mm/memory.c:416 exit_mmap+0x2c0/0x530 mm/mmap.c:3184 __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: 0033:0x7f8334023618 Code: Bad RIP value. RSP: 002b:00007ffcc1260d78 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007ffcc1260e40 RCX: 00007f8334023618 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00007ffcc1260ef0 R08: 00000000000000e7 R09: fffffffffffffe50 R10: 00000000ffffffff R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000003 R15: 000000000000000e Modules linked in: ---[ end trace 75d15d94f2afcbb3 ]--- RIP: 0010:__list_del_entry_valid.cold+0xf/0x55 lib/list_debug.c:51 Code: e8 5a b1 b9 fd 0f 0b 48 89 f1 48 c7 c7 80 be b4 88 4c 89 e6 e8 46 b1 b9 fd 0f 0b 48 89 ee 48 c7 c7 20 c0 b4 88 e8 35 b1 b9 fd <0f> 0b 4c 89 ea 48 89 ee 48 c7 c7 60 bf b4 88 e8 21 b1 b9 fd 0f 0b RSP: 0018:ffffc90015d0fbb0 EFLAGS: 00010286 RAX: 0000000000000054 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff88801ceee000 RSI: ffffffff815f5a85 RDI: fffff52002ba1f68 RBP: ffff8880001086a0 R08: 0000000000000054 R09: ffff8880ae6318e7 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000000000 R13: ffff88809f986de0 R14: ffff888097377e00 R15: ffff8880001086a0 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31d2c000 CR3: 0000000090149000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400