general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 1 PID: 15235 Comm: syz-executor.2 Not tainted 5.13.0-rc7-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+0x491/0x940 mm/percpu.c:2081
Code: 3c 02 00 0f 85 df 03 00 00 49 8b 7d 00 48 01 df e8 34 1b 08 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 1b 04 00 00 48 8b 68 20 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90008fcfc30 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffffe8fff6aff000 RCX: 0000000000000004
RDX: dffffc0000000000 RSI: 000ffffffffff000 RDI: 0000000000000020
RBP: ffff88823ffe38c0 R08: 0000000000000001 R09: 0000000000000003
R10: fffff520011f9f74 R11: 0000000000000397 R12: 0000607f3ccff000
R13: ffff88823ffe3c08 R14: ffff8880b9e54e48 R15: ffff8880b9e52000
FS:  00007f05319c2700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 000000004781f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tun_free_netdev+0x6e/0x130 drivers/net/tun.c:2203
 netdev_run_todo+0x5aa/0x910 net/core/dev.c:10575
 __tun_chr_ioctl.isra.0+0xcf7/0x3b30 drivers/net/tun.c:3297
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl fs/ioctl.c:1055 [inline]
 __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:1055
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
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:00007f05319c2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9
RDX: 0000000020000040 RSI: 00000000400454ca RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffe97cbb38f R14: 00007f05319c2300 R15: 0000000000022000
Modules linked in:
---[ end trace 00ded0160fba1d7c ]---
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+0x491/0x940 mm/percpu.c:2081
Code: 3c 02 00 0f 85 df 03 00 00 49 8b 7d 00 48 01 df e8 34 1b 08 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 1b 04 00 00 48 8b 68 20 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90008fcfc30 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffffe8fff6aff000 RCX: 0000000000000004
RDX: dffffc0000000000 RSI: 000ffffffffff000 RDI: 0000000000000020
RBP: ffff88823ffe38c0 R08: 0000000000000001 R09: 0000000000000003
R10: fffff520011f9f74 R11: 0000000000000397 R12: 0000607f3ccff000
R13: ffff88823ffe3c08 R14: ffff8880b9e54e48 R15: ffff8880b9e52000
FS:  00007f05319c2700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 000000004781f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400