list_del corruption. prev->next should be ffff88810e6dd628, but was ffff000000000000. (prev=ffff88810e7d00a8) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:59! invalid opcode: 0000 [#2] PREEMPT SMP KASAN CPU: 0 PID: 241 Comm: kworker/u4:1 Tainted: G D 6.0.0-rc1-syzkaller-00028-g4dce3b375179 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:__list_del_entry_valid.cold+0x12/0x72 lib/list_debug.c:59 Code: fc ff 0f 0b 48 89 f1 48 c7 c7 e0 b2 62 86 4c 89 e6 e8 25 1f fc ff 0f 0b 4c 89 e1 48 89 ee 48 c7 c7 40 b5 62 86 e8 11 1f fc ff <0f> 0b 48 89 ee 48 c7 c7 20 b4 62 86 e8 00 1f fc ff 0f 0b 4c 89 e2 RSP: 0000:ffffc9000177fcc8 EFLAGS: 00010082 RAX: 000000000000006d RBX: ffff8881f6837b00 RCX: 0000000000000000 RDX: ffff88810e6db900 RSI: ffffffff812c97e8 RDI: fffff520002eff8b RBP: ffff88810e6dd628 R08: 000000000000006d R09: 0000000000000000 R10: 0000000080000002 R11: 0000000000000000 R12: ffff88810e7d00a8 R13: ffff88810e6b1d28 R14: ffff8881f68385e8 R15: ffffc9000177fda0 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823ffff000 CR3: 0000000007825000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:134 [inline] list_move include/linux/list.h:217 [inline] pick_next_task_fair+0x170/0xf80 kernel/sched/fair.c:7468 __pick_next_task kernel/sched/core.c:5804 [inline] pick_next_task kernel/sched/core.c:6313 [inline] __schedule+0x3a3/0x26f0 kernel/sched/core.c:6458 do_task_dead+0xd1/0x100 kernel/sched/core.c:6512 do_exit+0x18bd/0x2930 kernel/exit.c:847 call_usermodehelper_exec_async+0x418/0x580 kernel/umh.c:125 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:freelist_dereference mm/slub.c:347 [inline] RIP: 0010:get_freepointer mm/slub.c:354 [inline] RIP: 0010:get_freepointer_safe mm/slub.c:368 [inline] RIP: 0010:slab_alloc_node mm/slub.c:3211 [inline] RIP: 0010:slab_alloc mm/slub.c:3251 [inline] RIP: 0010:kmem_cache_alloc_trace+0x15e/0x3b0 mm/slub.c:3282 Code: 8b 51 08 48 8b 01 48 83 79 10 00 48 89 44 24 08 0f 84 9d 01 00 00 48 85 c0 0f 84 94 01 00 00 48 8b 7d 00 8b 4d 28 40 f6 c7 0f <48> 8b 1c 08 0f 85 a0 01 00 00 48 8d 4a 08 65 48 0f c7 0f 0f 94 c0 RSP: 0000:ffffc9000001fce8 EFLAGS: 00010246 RAX: ffff000000000000 RBX: 0000000000000000 RCX: 0000000000000800 RDX: 0000000000004d49 RSI: 0000000000000dc0 RDI: 000000000003b470 RBP: ffff888100042140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000dc0 R13: 0000000000000a20 R14: 0000000000000dc0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823ffff000 CR3: 0000000007825000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8b 51 08 mov 0x8(%rcx),%edx 3: 48 8b 01 mov (%rcx),%rax 6: 48 83 79 10 00 cmpq $0x0,0x10(%rcx) b: 48 89 44 24 08 mov %rax,0x8(%rsp) 10: 0f 84 9d 01 00 00 je 0x1b3 16: 48 85 c0 test %rax,%rax 19: 0f 84 94 01 00 00 je 0x1b3 1f: 48 8b 7d 00 mov 0x0(%rbp),%rdi 23: 8b 4d 28 mov 0x28(%rbp),%ecx 26: 40 f6 c7 0f test $0xf,%dil * 2a: 48 8b 1c 08 mov (%rax,%rcx,1),%rbx <-- trapping instruction 2e: 0f 85 a0 01 00 00 jne 0x1d4 34: 48 8d 4a 08 lea 0x8(%rdx),%rcx 38: 65 48 0f c7 0f cmpxchg16b %gs:(%rdi) 3d: 0f 94 c0 sete %al