netdev - [syzbot] [net?] INFO: task hung in __tun_chr

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Date: Thu, 06 Jun 2024 23:03:18 -0700
From: syzbot <syzbot+26c7b4c3afe5450b3e15@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, jasowang@...hat.com, 
	kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	pabeni@...hat.com, syzkaller-bugs@...glegroups.com, 
	willemdebruijn.kernel@...il.com
Subject: [syzbot] [net?] INFO: task hung in __tun_chr_ioctl (6)

Hello,

syzbot found the following issue on:

HEAD commit:    71d7b52cc33b Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1259b316980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=399230c250e8119c
dashboard link: https://syzkaller.appspot.com/bug?extid=26c7b4c3afe5450b3e15
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/910b86eac08b/disk-71d7b52c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a5a6ad2a9a6c/vmlinux-71d7b52c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ad7485d12317/bzImage-71d7b52c.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+26c7b4c3afe5450b3e15@...kaller.appspotmail.com

INFO: task syz-executor.3:5788 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc2-syzkaller-00064-g71d7b52cc33b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:28496 pid:5788  tgid:5786  ppid:5116   flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
 __tun_chr_ioctl+0x4fc/0x4770 drivers/net/tun.c:3110
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f632567cf69
RSP: 002b:00007f63263a70c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f63257b3f80 RCX: 00007f632567cf69
RDX: 00000000200000c0 RSI: 00000000400454ca RDI: 0000000000000003
RBP: 00007f63256da6fe R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f63257b3f80 R15: 00007ffc7df747b8
 </TASK>
INFO: task syz-executor.3:5790 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc2-syzkaller-00064-g71d7b52cc33b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:28480 pid:5790  tgid:5786  ppid:5116   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
 devinet_ioctl+0x26e/0x1f10 net/ipv4/devinet.c:1101
 inet_ioctl+0x3aa/0x3f0 net/ipv4/af_inet.c:1003
 packet_ioctl+0xb3/0x280 net/packet/af_packet.c:4256
 sock_do_ioctl+0x116/0x280 net/socket.c:1222
 sock_ioctl+0x22e/0x6c0 net/socket.c:1341
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f632567cf69
RSP: 002b:00007f63263860c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f63257b4050 RCX: 00007f632567cf69
RDX: 0000000020000180 RSI: 0000000000008914 RDI: 0000000000000004
RBP: 00007f63256da6fe R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f63257b4050 R15: 00007ffc7df747b8
 </TASK>
INFO: task syz-executor.0:5798 blocked for more than 144 seconds.
      Not tainted 6.10.0-rc2-syzkaller-00064-g71d7b52cc33b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:27280 pid:5798  tgid:5796  ppid:5258   flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
 nl80211_pre_doit+0xb4/0xb10 net/wireless/nl80211.c:16405
 genl_family_rcv_msg_doit+0x1be/0x2f0 net/netlink/genetlink.c:1110
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x565/0x800 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2564
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x542/0x820 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0xab5/0xc90 net/socket.c:2585
 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2639


---
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