syzbot


BUG: corrupted list in bpf_lru_push_free

Status: moderation: reported on 2024/05/25 02:23
Subsystems: bpf
[Documentation on labels]
Reported-by: syzbot+8967cc86e5b4f6b1c33a@syzkaller.appspotmail.com
First crash: 28d, last: 28d

Sample crash report:
list_del corruption. next->prev should be ffffc9002baebab8, but was ffffc9002baebab9. (next=ffffe8ffab5072c0)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:65!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 3 PID: 13794 Comm: syz-executor.1 Not tainted 6.9.0-syzkaller-09868-g6e51b4b5bbc0 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__list_del_entry_valid_or_report+0x141/0x1c0 lib/list_debug.c:65
Code: eb fc 90 0f 0b 48 89 c2 48 c7 c7 c0 8f 8f 8b e8 e5 43 eb fc 90 0f 0b 48 89 d1 48 c7 c7 40 90 8f 8b 48 89 c2 e8 d0 43 eb fc 90 <0f> 0b 48 89 34 24 e8 f4 db 67 fd 48 8b 34 24 e9 d5 fe ff ff 48 89
RSP: 0018:ffffc9000d26f9a8 EFLAGS: 00010086
RAX: 000000000000006d RBX: ffffc9002baebab8 RCX: ffffffff816f3549
RDX: 0000000000000000 RSI: ffffffff816fc0c6 RDI: 0000000000000005
RBP: ffff888012daf2c0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000001 R11: 0000000000000002 R12: ffffe8ffab5072b0
R13: ffffc9002baebaca R14: 0000000000000004 R15: ffffe8ffab5072d8
FS:  0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f5e5bb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000056ef6480 CR3: 0000000025906000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:124 [inline]
 __list_del_entry include/linux/list.h:215 [inline]
 list_move include/linux/list.h:298 [inline]
 bpf_common_lru_push_free kernel/bpf/bpf_lru_list.c:531 [inline]
 bpf_lru_push_free+0x311/0x5e0 kernel/bpf/bpf_lru_list.c:561
 htab_lru_push_free kernel/bpf/hashtab.c:1197 [inline]
 __htab_map_lookup_and_delete_batch+0x174b/0x2820 kernel/bpf/hashtab.c:1870
 bpf_map_do_batch+0x32a/0x6e0 kernel/bpf/syscall.c:5198
 __sys_bpf+0x52e0/0x5830 kernel/bpf/syscall.c:5747
 __do_sys_bpf kernel/bpf/syscall.c:5794 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5792 [inline]
 __ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5792
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7269579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5e5b5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000165
RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 0000000020000800
RDX: 0000000000000038 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x141/0x1c0 lib/list_debug.c:65
Code: eb fc 90 0f 0b 48 89 c2 48 c7 c7 c0 8f 8f 8b e8 e5 43 eb fc 90 0f 0b 48 89 d1 48 c7 c7 40 90 8f 8b 48 89 c2 e8 d0 43 eb fc 90 <0f> 0b 48 89 34 24 e8 f4 db 67 fd 48 8b 34 24 e9 d5 fe ff ff 48 89
RSP: 0018:ffffc9000d26f9a8 EFLAGS: 00010086
RAX: 000000000000006d RBX: ffffc9002baebab8 RCX: ffffffff816f3549
RDX: 0000000000000000 RSI: ffffffff816fc0c6 RDI: 0000000000000005
RBP: ffff888012daf2c0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000001 R11: 0000000000000002 R12: ffffe8ffab5072b0
R13: ffffc9002baebaca R14: 0000000000000004 R15: ffffe8ffab5072d8
FS:  0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f5e5bb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000056ef6480 CR3: 0000000025906000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/21 02:22 upstream 6e51b4b5bbc0 c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 BUG: corrupted list in bpf_lru_push_free
* Struck through repros no longer work on HEAD.