[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.598854] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.305788] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.680770] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.411837] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 28.035911] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. [ 33.694747] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 34.233591] ------------[ cut here ]------------ [ 34.238402] WARNING: CPU: 1 PID: 4144 at lib/list_debug.c:36 __list_add+0x169/0x1c0() [ 34.246352] list_add double add: new=ffff8801cb3d0c58, prev=ffffffff844ee460, next=ffff8801cb3d0c58. [ 34.255723] Kernel panic - not syncing: panic_on_warn set ... [ 34.255723] [ 34.263085] CPU: 1 PID: 4144 Comm: syz-executor535 Not tainted 4.4.148-gf057ff9 #81 [ 34.270861] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.280203] 0000000000000000 b055c8588ec9fb84 ffff8800ba8af948 ffffffff81e1448d [ 34.288236] ffffffff83a44e40 ffff8801d8e46000 ffffffff83c155c0 0000000000000009 [ 34.296264] 0000000000000024 ffff8800ba8afa08 ffffffff8140ce24 0000000041b58ab3 [ 34.304287] Call Trace: [ 34.306865] [] dump_stack+0xc1/0x124 [ 34.312218] [] panic+0x19e/0x38d [ 34.317221] [] ? add_taint.cold.4+0x16/0x16 [ 34.323698] [] ? warn_slowpath_common.cold.6+0x5/0x20 [ 34.330522] [] warn_slowpath_common.cold.6+0x20/0x20 [ 34.337258] [] ? __list_add+0x169/0x1c0 [ 34.342866] [] warn_slowpath_fmt+0xbf/0x100 [ 34.348819] [] ? warn_slowpath_common+0x120/0x120 [ 34.355295] [] ? delay_tsc+0x8f/0xc0 [ 34.360642] [] ? __delay+0x10/0x20 [ 34.365820] [] __list_add+0x169/0x1c0 [ 34.371259] [] blk_trace_startstop+0x24c/0x340 [ 34.377482] [] ? blk_msg_write+0x140/0x140 [ 34.383350] [] ? avc_ss_reset+0x110/0x110 [ 34.389134] [] sg_ioctl+0x1198/0x2930 [ 34.394569] [] ? sg_new_write.isra.23+0x8d0/0x8d0 [ 34.401043] [] ? handle_mm_fault+0xe4a/0x31e0 [ 34.407168] [] ? handle_mm_fault+0xc3d/0x31e0 [ 34.413300] [] ? putname+0xdb/0x110 [ 34.418562] [] ? sg_new_write.isra.23+0x8d0/0x8d0 [ 34.425034] [] do_vfs_ioctl+0x63f/0xf40 [ 34.430643] [] ? ioctl_preallocate+0x1f0/0x1f0 [ 34.436861] [] ? vmacache_update+0xfe/0x130 [ 34.442817] [] ? __do_page_fault+0x38a/0xa10 [ 34.448860] [] ? security_file_ioctl+0x8f/0xc0 [ 34.455087] [] SyS_ioctl+0x8f/0xc0 [ 34.460273] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.617534] Shutting down cpus with NMI [ 35.621905] Dumping ftrace buffer: [ 35.625534] (ftrace buffer empty) [ 35.629234] Kernel Offset: disabled [ 35.632858] Rebooting in 86400 seconds..