syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: rcu_gp process_srcu
RIP: 0010:____bpf_get_local_storage kernel/bpf/cgroup.c:1774 [inline]
RIP: 0010:bpf_get_local_storage+0xbd/0x180 kernel/bpf/cgroup.c:1756
Code: e0 49 83 c6 08 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 a2 83 39 00 4d 8b 36 83 fb 15 75 5c 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 84 83 39 00 49 8b 1e e8 ec 7e 6c
RSP: 0018:ffffc900000072d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000015 RCX: 0000000000000100
RDX: ffff88801bef4980 RSI: 0000000000000015 RDI: 0000000000000015
RBP: ffffc90000007310 R08: 0000000000000003 R09: 0000000000000000
R10: ffffc90000007380 R11: ffffffffa0203ce4 R12: 0000000000000001
R13: ffff88801248d640 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001c40 CR3: 000000003701b000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 bpf_prog_e63b106389d7305a+0x2e/0x45
 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
 __bpf_prog_run include/linux/filter.h:723 [inline]
 bpf_prog_run include/linux/filter.h:730 [inline]
 __bpf_prog_run_save_cb+0x127/0x370 include/linux/filter.h:980
 bpf_prog_run_array_cg kernel/bpf/cgroup.c:81 [inline]
 __cgroup_bpf_run_filter_skb+0x9e0/0xf40 kernel/bpf/cgroup.c:1612
 sk_filter_trim_cap+0xd42/0xf50 net/core/filter.c:150
 tcp_filter net/ipv4/tcp_ipv4.c:2117 [inline]
 tcp_v4_rcv+0x1f90/0x2f20 net/ipv4/tcp_ipv4.c:2304
 ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:207
 ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:241
 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318
 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318
 __netif_receive_skb_one_core net/core/dev.c:6137 [inline]
 __netif_receive_skb+0x143/0x380 net/core/dev.c:6250
 process_backlog+0x54f/0x1340 net/core/dev.c:6602
 __napi_poll+0xae/0x320 net/core/dev.c:7666
 napi_poll net/core/dev.c:7729 [inline]
 net_rx_action+0x64a/0xe00 net/core/dev.c:7881
 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:delay_loop+0x20/0x30 arch/x86/lib/delay.c:44
Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 f8 48 85 c0 74 19 eb 02 66 90 eb 0e 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 <48> ff c8 75 fb 48 ff c8 c3 cc cc cc cc cc 66 90 90 90 90 90 90 90
RSP: 0018:ffffc900001b78d0 EFLAGS: 00000216
RAX: 00000000000022ff RBX: 0000000000000001 RCX: 0000000008583a9c
RDX: 00000000000036b0 RSI: 0000000000000008 RDI: 00000000000036b1
RBP: 0000000000000001 R08: ffff88801fc42b47 R09: 1ffff11003f88568
R10: dffffc0000000000 R11: ffffffff8b5a31d0 R12: 0000000000000001
R13: 0000000000004fb8 R14: ffff88801fc42b60 R15: dffffc0000000000
 udelay include/asm-generic/delay.h:64 [inline]
 try_check_zero+0x412/0x470 kernel/rcu/srcutree.c:1182
 srcu_advance_state kernel/rcu/srcutree.c:1886 [inline]
 process_srcu+0x2d3/0x1220 kernel/rcu/srcutree.c:1995
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:____bpf_get_local_storage kernel/bpf/cgroup.c:1774 [inline]
RIP: 0010:bpf_get_local_storage+0xbd/0x180 kernel/bpf/cgroup.c:1756
Code: e0 49 83 c6 08 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 a2 83 39 00 4d 8b 36 83 fb 15 75 5c 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 84 83 39 00 49 8b 1e e8 ec 7e 6c
RSP: 0018:ffffc900000072d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000015 RCX: 0000000000000100
RDX: ffff88801bef4980 RSI: 0000000000000015 RDI: 0000000000000015
RBP: ffffc90000007310 R08: 0000000000000003 R09: 0000000000000000
R10: ffffc90000007380 R11: ffffffffa0203ce4 R12: 0000000000000001
R13: ffff88801248d640 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001c40 CR3: 000000003701b000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	e0 49                	loopne 0x4b
   2:	83 c6 08             	add    $0x8,%esi
   5:	4c 89 f0             	mov    %r14,%rax
   8:	48 c1 e8 03          	shr    $0x3,%rax
   c:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
  11:	74 08                	je     0x1b
  13:	4c 89 f7             	mov    %r14,%rdi
  16:	e8 a2 83 39 00       	call   0x3983bd
  1b:	4d 8b 36             	mov    (%r14),%r14
  1e:	83 fb 15             	cmp    $0x15,%ebx
  21:	75 5c                	jne    0x7f
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 84 83 39 00       	call   0x3983bd
  39:	49 8b 1e             	mov    (%r14),%rbx
  3c:	e8                   	.byte 0xe8
  3d:	ec                   	in     (%dx),%al
  3e:	7e 6c                	jle    0xac