general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 0 PID: 22646 Comm: syz-executor.1 Not tainted 5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:pcpu_get_page_chunk mm/percpu.c:261 [inline]
RIP: 0010:pcpu_chunk_addr_search mm/percpu.c:1579 [inline]
RIP: 0010:free_percpu mm/percpu.c:2099 [inline]
RIP: 0010:free_percpu+0x183/0xae0 mm/percpu.c:2081
Code: 80 3c 02 00 0f 85 d5 08 00 00 48 8b 3b 4c 01 ef e8 c2 aa 09 00 48 ba 00 00 00 00 00 fc ff df 48 8d 78 20 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 df 08 00 00 48 8b 58 20 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90002177c20 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffff88823ffe7c80 RCX: 0000000000000004
RDX: dffffc0000000000 RSI: ffffffff81ace1c4 RDI: 0000000000000020
RBP: ffff88823ffe7988 R08: 0000000000000000 R09: 0000000000000003
R10: ffffffff81ace16d R11: 0000000000000002 R12: 0000607f45ad8000
R13: ffffe8ffff6d8000 R14: ffff8880b9c36000 R15: 0000000000000003
FS:  00007f5bfb5a6700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c014401000 CR3: 0000000062587000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tun_free_netdev+0x78/0x140 drivers/net/tun.c:2195
 netdev_run_todo+0x6b4/0xa80 net/core/dev.c:10550
 __tun_chr_ioctl.isra.0+0x9c9/0x4150 drivers/net/tun.c:3250
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x466459
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5bfb5a6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 0000000020000000 RSI: 00000000400454ca RDI: 0000000000000005
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffe8a34182f R14: 00007f5bfb5a6300 R15: 0000000000022000
Modules linked in:
---[ end trace a5d3ba9f74444804 ]---
RIP: 0010:pcpu_get_page_chunk mm/percpu.c:261 [inline]
RIP: 0010:pcpu_chunk_addr_search mm/percpu.c:1579 [inline]
RIP: 0010:free_percpu mm/percpu.c:2099 [inline]
RIP: 0010:free_percpu+0x183/0xae0 mm/percpu.c:2081
Code: 80 3c 02 00 0f 85 d5 08 00 00 48 8b 3b 4c 01 ef e8 c2 aa 09 00 48 ba 00 00 00 00 00 fc ff df 48 8d 78 20 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 df 08 00 00 48 8b 58 20 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90002177c20 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffff88823ffe7c80 RCX: 0000000000000004
RDX: dffffc0000000000 RSI: ffffffff81ace1c4 RDI: 0000000000000020
RBP: ffff88823ffe7988 R08: 0000000000000000 R09: 0000000000000003
R10: ffffffff81ace16d R11: 0000000000000002 R12: 0000607f45ad8000
R13: ffffe8ffff6d8000 R14: ffff8880b9c36000 R15: 0000000000000003
FS:  00007f5bfb5a6700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c014401000 CR3: 0000000062587000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400