syzbot


general protection fault in gro_cells_destroy (2)

Status: fixed on 2022/03/08 16:11
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: e28587cc491e sit: do not call ipip6_dev_free() from sit_init_net()
First crash: 221d, last: 205d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in gro_cells_destroy 62 1141d 1305d 0/23 auto-closed as invalid on 2019/10/25 08:37

Sample crash report:
general protection fault, probably for non-canonical address 0xfffd1bfffa614ce1: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0xffe8ffffd30a6708-0xffe8ffffd30a670f]
CPU: 0 PID: 6658 Comm: kworker/u4:10 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:__skb_unlink include/linux/skbuff.h:2167 [inline]
RIP: 0010:__skb_dequeue include/linux/skbuff.h:2183 [inline]
RIP: 0010:__skb_queue_purge include/linux/skbuff.h:2901 [inline]
RIP: 0010:gro_cells_destroy net/core/gro_cells.c:103 [inline]
RIP: 0010:gro_cells_destroy+0x19a/0x360 net/core/gro_cells.c:92
Code: e8 03 80 3c 28 00 0f 85 4c 01 00 00 48 8d 7a 08 49 8b 47 08 49 c7 07 00 00 00 00 48 89 f9 49 c7 47 08 00 00 00 00 48 c1 e9 03 <80> 3c 29 00 0f 85 06 01 00 00 48 89 c1 48 89 42 08 48 c1 e9 03 80
RSP: 0018:ffffc900044df9e8 EFLAGS: 00010a06
RAX: ffe8ffffd30a68ff RBX: ffffe8ffffd30a68 RCX: 1ffd1ffffa614ce1
RDX: ffe8ffffd30a6700 RSI: ffffffff8744e036 RDI: ffe8ffffd30a6708
RBP: dffffc0000000000 R08: 0000000000000008 R09: 0000000000000001
R10: ffffffff872bb5b8 R11: 0000000000000000 R12: fffff91ffffa614f
R13: 0000000000000001 R14: ffff88801d25edd0 R15: ffffe8ffffd30a67
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00858af00 CR3: 0000000018d25000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 ip_tunnel_dev_free+0x15/0x60 net/ipv4/ip_tunnel.c:1010
 netdev_run_todo+0x6c3/0xaa0 net/core/dev.c:9956
 ip_tunnel_delete_nets+0x3a4/0x5b0 net/ipv4/ip_tunnel.c:1124
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595
 process_one_work+0x9b2/0x1660 kernel/workqueue.c:2298
 worker_thread+0x65d/0x1130 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace ba3a5094f3f88535 ]---
RIP: 0010:__skb_unlink include/linux/skbuff.h:2167 [inline]
RIP: 0010:__skb_dequeue include/linux/skbuff.h:2183 [inline]
RIP: 0010:__skb_queue_purge include/linux/skbuff.h:2901 [inline]
RIP: 0010:gro_cells_destroy net/core/gro_cells.c:103 [inline]
RIP: 0010:gro_cells_destroy+0x19a/0x360 net/core/gro_cells.c:92
Code: e8 03 80 3c 28 00 0f 85 4c 01 00 00 48 8d 7a 08 49 8b 47 08 49 c7 07 00 00 00 00 48 89 f9 49 c7 47 08 00 00 00 00 48 c1 e9 03 <80> 3c 29 00 0f 85 06 01 00 00 48 89 c1 48 89 42 08 48 c1 e9 03 80
RSP: 0018:ffffc900044df9e8 EFLAGS: 00010a06
RAX: ffe8ffffd30a68ff RBX: ffffe8ffffd30a68 RCX: 1ffd1ffffa614ce1
RDX: ffe8ffffd30a6700 RSI: ffffffff8744e036 RDI: ffe8ffffd30a6708
RBP: dffffc0000000000 R08: 0000000000000008 R09: 0000000000000001
R10: ffffffff872bb5b8 R11: 0000000000000000 R12: fffff91ffffa614f
R13: 0000000000000001 R14: ffff88801d25edd0 R15: ffffe8ffffd30a67
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00290d980 CR3: 0000000023b9d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	e8 03 80 3c 28       	callq  0x283c8008
   5:	00 0f                	add    %cl,(%rdi)
   7:	85 4c 01 00          	test   %ecx,0x0(%rcx,%rax,1)
   b:	00 48 8d             	add    %cl,-0x73(%rax)
   e:	7a 08                	jp     0x18
  10:	49 8b 47 08          	mov    0x8(%r15),%rax
  14:	49 c7 07 00 00 00 00 	movq   $0x0,(%r15)
  1b:	48 89 f9             	mov    %rdi,%rcx
  1e:	49 c7 47 08 00 00 00 	movq   $0x0,0x8(%r15)
  25:	00
  26:	48 c1 e9 03          	shr    $0x3,%rcx
* 2a:	80 3c 29 00          	cmpb   $0x0,(%rcx,%rbp,1) <-- trapping instruction
  2e:	0f 85 06 01 00 00    	jne    0x13a
  34:	48 89 c1             	mov    %rax,%rcx
  37:	48 89 42 08          	mov    %rax,0x8(%rdx)
  3b:	48 c1 e9 03          	shr    $0x3,%rcx
  3f:	80                   	.byte 0x80

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-bpf-next-kasan-gce 2022/01/14 18:45 bpf-next 86c7ecad3bf8 53e00b45 .config log report info general protection fault in gro_cells_destroy
ci-upstream-bpf-next-kasan-gce 2021/12/29 03:14 bpf-next 4b443bc1785f 76c8cf06 .config log report info general protection fault in gro_cells_destroy