[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   27.186585] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available)
[   27.515211] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available)
[   28.474109] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available)
[   45.460545] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available)
[   45.613550] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.48' (ECDSA) to the list of known hosts.
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[   51.287982] BUG: using __this_cpu_add() in preemptible [00000000] code: syzkaller571781/4095
[   51.296764] caller is __this_cpu_preempt_check+0x1c/0x20
[   51.302192] CPU: 0 PID: 4095 Comm: syzkaller571781 Not tainted 4.4.113-g962d1f3 #2
[   51.309870] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   51.319202]  0000000000000000 3b3df7b6291c9124 ffff8800b950f6c8 ffffffff81d028ed
[   51.327176]  0000000000000000 ffffffff839fe3a0 ffffffff83cef6a0 ffff8800b98edf00
[   51.335148]  0000000000000003 ffff8800b950f708 ffffffff81d62834 ffffffff810002b8
[   51.343125] Call Trace:
[   51.345690]  [<ffffffff81d028ed>] dump_stack+0xc1/0x124
[   51.351029]  [<ffffffff81d62834>] check_preemption_disabled+0x1d4/0x200
[   51.357759]  [<ffffffff810002b8>] ? 0xffffffff810002b8
[   51.363006]  [<ffffffff81d6289c>] __this_cpu_preempt_check+0x1c/0x20
[   51.369488]  [<ffffffff831289d9>] tcp_try_coalesce+0x249/0x4d0
[   51.375438]  [<ffffffff83128790>] ? tcp_parse_options+0x970/0x970
[   51.381645]  [<ffffffff82e1ff9c>] ? skb_copy_datagram_from_iter+0x38c/0x5a0
[   51.388721]  [<ffffffff83130b57>] tcp_queue_rcv+0x127/0x720
[   51.394405]  [<ffffffff8314842b>] tcp_send_rcvq+0x39b/0x450
[   51.400088]  [<ffffffff83148090>] ? tcp_rcv_established+0x2230/0x2230
[   51.406642]  [<ffffffff8113bd00>] ? do_softirq.part.17+0x40/0x60
[   51.412761]  [<ffffffff81235cfb>] ? trace_hardirqs_on_caller+0x38b/0x590
[   51.419577]  [<ffffffff82df2ad0>] ? lock_sock_nested+0x90/0x120
[   51.425606]  [<ffffffff81235f0d>] ? trace_hardirqs_on+0xd/0x10
[   51.431551]  [<ffffffff8113bd8a>] ? __local_bh_enable_ip+0x6a/0xd0
[   51.437843]  [<ffffffff8311f71f>] tcp_sendmsg+0x1e8f/0x2b10
[   51.443542]  [<ffffffff81236530>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[   51.450537]  [<ffffffff81b67052>] ? sock_has_perm+0x1c2/0x3e0
[   51.456397]  [<ffffffff8311d890>] ? tcp_sendpage+0x1830/0x1830
[   51.462342]  [<ffffffff831d5141>] ? inet_sendmsg+0x201/0x4c0
[   51.468113]  [<ffffffff831d51fc>] inet_sendmsg+0x2bc/0x4c0
[   51.473707]  [<ffffffff831d4fb3>] ? inet_sendmsg+0x73/0x4c0
[   51.479393]  [<ffffffff831d4f40>] ? inet_recvmsg+0x4c0/0x4c0
[   51.485163]  [<ffffffff82dea20a>] sock_sendmsg+0xca/0x110
[   51.490673]  [<ffffffff82debde1>] ___sys_sendmsg+0x6c1/0x7c0
[   51.496444]  [<ffffffff82deb720>] ? copy_msghdr_from_user+0x550/0x550
[   51.503010]  [<ffffffff815772f2>] ? __fget+0x232/0x3b0
[   51.508261]  [<ffffffff81577107>] ? __fget+0x47/0x3b0
[   51.513422]  [<ffffffff81577551>] ? __fget_light+0xa1/0x1e0
[   51.519104]  [<ffffffff815776a8>] ? __fdget+0x18/0x20
[   51.524267]  [<ffffffff82dede33>] __sys_sendmsg+0xd3/0x190
[   51.529866]  [<ffffffff82dedd60>] ? SyS_shutdown+0x1b0/0x1b0
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[   51.535644]  [<ffffffff810dc6f0>] ? __do_page_fault+0x380/0xa00
[   51.541675]  [<ffffffff81235cfb>] ? trace_hardirqs_on_caller+0x38b/0x590
[   51.548493]  [<ffffffff82dedf1d>] SyS_sendmsg+0x2d/0x50
[   51.553830]  [<ffffffff83771c9f>] entry_SYSCALL_64_fastpath+0x1c/0x98