BUG: unable to handle kernel paging request in qdisc_put

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 15bc20c6 Merge tag 'tty-5.9-rc3' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1277d741900000
kernel config: https://syzkaller.appspot.com/x/.config?x=978db74cb30aa994
dashboard link: https://syzkaller.appspot.com/bug?extid=932046320fcbfa8a8bba
compiler: gcc (GCC) 10.1.0-syz 20200507
CC: [da...@davemloft.net j...@mojatatu.com ji...@resnulli.us ku...@kernel.org linux-...@vger.kernel.org net...@vger.kernel.org xiyou.w...@gmail.com]

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+932046...@syzkaller.appspotmail.com

BUG: unable to handle page fault for address: ffffffff00000010
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 9a90067 P4D 9a90067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 27632 Comm: syz-executor.0 Not tainted 5.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:qdisc_put+0x3b/0xe0 net/sched/sch_generic.c:983
Code: e8 aa ea 1c fb 48 8d 7d 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 9b 00 00 00 <8b> 5d 10 31 ff 83 e3 01 89 de e8 f6 e6 1c fb 85 db 74 09 5b 5d 41
RSP: 0018:ffffc9000747fba0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000050 RCX: ffffc90006299000
RDX: 1fffffffe0000002 RSI: ffffffff86575466 RDI: ffffffff00000010
RBP: ffffffff00000000 R08: 0000000000000001 R09: ffffffff8c5f39ff
R10: 0000000000000050 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff888000107810 R14: ffffed1002276080 R15: ffffffff00000000
FS: 00007f71404d9700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000010 CR3: 000000003fcde000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
shutdown_scheduler_queue net/sched/sch_generic.c:1308 [inline]
netdev_for_each_tx_queue include/linux/netdevice.h:2229 [inline]
dev_shutdown+0x11b/0x499 net/sched/sch_generic.c:1314
rollback_registered_many+0x62f/0x1210 net/core/dev.c:9276
rollback_registered net/core/dev.c:9328 [inline]
unregister_netdevice_queue+0x2dd/0x570 net/core/dev.c:10409
unregister_netdevice include/linux/netdevice.h:2774 [inline]
__tun_detach+0xff6/0x1310 drivers/net/tun.c:691
tun_detach drivers/net/tun.c:708 [inline]
tun_chr_close+0xd9/0x180 drivers/net/tun.c:3408
__fput+0x285/0x920 fs/file_table.c:281
task_work_run+0xdd/0x190 kernel/task_work.c:141
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:140 [inline]
exit_to_user_mode_prepare+0x195/0x1c0 kernel/entry/common.c:167
syscall_exit_to_user_mode+0x59/0x2b0 kernel/entry/common.c:242
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f71404d8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 0000000000019dc0 RCX: 000000000045d5b9
RDX: 0000000020000000 RSI: 00000000400454ca RDI: 0000000000000004
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 000000000169fb6f R14: 00007f71404d99c0 R15: 000000000118cf4c
Modules linked in:
CR2: ffffffff00000010
---[ end trace 17be5d27b84b6d95 ]---
RIP: 0010:qdisc_put+0x3b/0xe0 net/sched/sch_generic.c:983
Code: e8 aa ea 1c fb 48 8d 7d 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 9b 00 00 00 <8b> 5d 10 31 ff 83 e3 01 89 de e8 f6 e6 1c fb 85 db 74 09 5b 5d 41
RSP: 0018:ffffc9000747fba0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000050 RCX: ffffc90006299000
RDX: 1fffffffe0000002 RSI: ffffffff86575466 RDI: ffffffff00000010
RBP: ffffffff00000000 R08: 0000000000000001 R09: ffffffff8c5f39ff
R10: 0000000000000050 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff888000107810 R14: ffffed1002276080 R15: ffffffff00000000
FS: 00007f71404d9700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000010 CR3: 000000003fcde000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.