general protection fault, probably for non-canonical address 0xdffffc000000008f: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000478-0x000000000000047f]
CPU: 1 PID: 8582 Comm: syz-executor.5 Not tainted 5.6.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:hlist_add_head_rcu include/linux/rculist.h:538 [inline]
RIP: 0010:qdisc_hash_add.part.21+0xae/0x220 net/sched/sch_api.c:279
Code: 69 6b 38 47 86 c8 61 4c 8d 73 28 48 b8 00 00 00 00 00 fc ff df c1 ed 1c 4d 8d a4 ed 78 04 00 00 4c 89 e2 4c 89 e7 48 c1 ea 03 <80> 3c 02 00 0f 85 21 01 00 00 4c 89 f2 49 8b ac ed 78 04 00 00 48
RSP: 0018:ffffc90002d17ac0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffffff897031c0 RCX: ffffffff814f119e
RDX: 000000000000008f RSI: 0000000000000008 RDI: 0000000000000478
RBP: 0000000000000000 R08: fffffbfff12d9969 R09: fffffbfff12d9969
R10: fffffbfff12d9968 R11: ffffffff896ccb47 R12: 0000000000000478
R13: 0000000000000000 R14: ffffffff897031e8 R15: 0000000000000000
FS:  00007fe7b4b01700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000076c000 CR3: 0000000097c5b000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 dev_qdisc_set_real_num_tx_queues+0x14b/0x230 net/sched/sch_generic.c:1287
 netif_set_real_num_tx_queues+0x1e6/0x650 net/core/dev.c:2878
 tun_set_real_num_queues drivers/net/tun.c:598 [inline]
 tun_attach+0x483/0x11a0 drivers/net/tun.c:845
 tun_set_iff drivers/net/tun.c:2704 [inline]
 __tun_chr_ioctl+0x15e7/0x3db0 drivers/net/tun.c:3043
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0xb8/0x110 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x6a/0xb0 fs/ioctl.c:770
 do_syscall_64+0xc6/0x5e0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c679
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe7b4b00c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe7b4b016d4 RCX: 000000000045c679
RDX: 00000000200000c0 RSI: 00000000400454ca RDI: 0000000000000004
RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000005a2 R14: 00000000004c81e0 R15: 000000000076bfac
Modules linked in:
---[ end trace 2d4b46b33f42eb6a ]---
RIP: 0010:hlist_add_head_rcu include/linux/rculist.h:538 [inline]
RIP: 0010:qdisc_hash_add.part.21+0xae/0x220 net/sched/sch_api.c:279
Code: 69 6b 38 47 86 c8 61 4c 8d 73 28 48 b8 00 00 00 00 00 fc ff df c1 ed 1c 4d 8d a4 ed 78 04 00 00 4c 89 e2 4c 89 e7 48 c1 ea 03 <80> 3c 02 00 0f 85 21 01 00 00 4c 89 f2 49 8b ac ed 78 04 00 00 48
RSP: 0018:ffffc90002d17ac0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffffff897031c0 RCX: ffffffff814f119e
RDX: 000000000000008f RSI: 0000000000000008 RDI: 0000000000000478
RBP: 0000000000000000 R08: fffffbfff12d9969 R09: fffffbfff12d9969
R10: fffffbfff12d9968 R11: ffffffff896ccb47 R12: 0000000000000478
R13: 0000000000000000 R14: ffffffff897031e8 R15: 0000000000000000
FS:  00007fe7b4b01700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000076c000 CR3: 0000000097c5b000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400