[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
Starting mcstransd: 
[   11.127845] random: crng init done
[....] 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

Warning: Permanently added '10.128.1.56' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   19.385335] 
[   19.385743] ===============================
[   19.386472] [ INFO: suspicious RCU usage. ]
[   19.387184] 4.9.202+ #0 Not tainted
[   19.387855] -------------------------------
[   19.388657] include/linux/radix-tree.h:199 suspicious rcu_dereference_check() usage!
[   19.389828] 
[   19.389828] other info that might help us debug this:
[   19.389828] 
[   19.391044] 
[   19.391044] rcu_scheduler_active = 2, debug_locks = 0
[   19.392303] 2 locks held by syz-executor190/2044:
[   19.393061]  #0:  (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<0000000060a1d721>] shmem_add_seals+0x166/0x1020
[   19.394810]  #1:  (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000d0941056>] shmem_add_seals+0x342/0x1020
[   19.396557] 
[   19.396557] stack backtrace:
[   19.397340] CPU: 1 PID: 2044 Comm: syz-executor190 Not tainted 4.9.202+ #0
[   19.398986]  ffff8801d13cfca0 ffffffff81b55d2b ffff8801c4c50de8 0000000000000000
[   19.400624]  0000000000000002 00000000000000c7 ffff8801d144c740 ffff8801d13cfcd0
[   19.402188]  ffffffff81406867 ffffea000735f240 dffffc0000000000 ffff8801d13cfd78
[   19.403526] Call Trace:
[   19.403893]  [<000000006dc5ea78>] dump_stack+0xcb/0x130
[   19.404630]  [<00000000e4809cf9>] lockdep_rcu_suspicious.cold+0x10a/0x149
[   19.406121]  [<000000002ad946d1>] shmem_add_seals+0xa44/0x1020
[   19.412069]  [<000000009cc038d2>] ? __vfs_read+0x550/0x550
[   19.417672]  [<00000000e0029ec8>] ? shmem_file_llseek+0x250/0x250
[   19.423895]  [<00000000aae78ba6>] ? vfs_write+0x366/0x520
[   19.429409]  [<00000000de28e742>] ? debug_lockdep_rcu_enabled+0x71/0xa0
[   19.436135]  [<0000000086282150>] ? selinux_file_fcntl+0x6c/0x120
[   19.442344]  [<000000009cfe3662>] shmem_fcntl+0xf7/0x130
[   19.447771]  [<00000000977e0214>] SyS_fcntl+0x1d5/0xb50
[   19.453126]  [<00000000781966e7>] ? SyS_write+0x186/0x270
[   19.458659]  [<0000000023fe42d2>] ? f_getown+0xb0/0xb0
[   19.463959]  [<00000000abe22847>] ? do_syscall_64+0x4a/0x5c0
[   19.469737]  [<0000000023fe42d2>] ? f_getown+0xb0/0xb0
[   19.474989]  [<000000002ba05cd8>] do_syscall_64+0x1ad/0x5c0
[   19.480939]  [<00000000d78fddb7>] entry_SYSCALL_64_af