[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 24.066530] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.528066] random: sshd: uninitialized urandom read (32 bytes read) [ 28.876369] random: sshd: uninitialized urandom read (32 bytes read) [ 29.430711] random: sshd: uninitialized urandom read (32 bytes read) [ 29.612530] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 35.057447] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.317006] kasan: CONFIG_KASAN_INLINE enabled [ 35.321721] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 35.329170] general protection fault: 0000 [#1] SMP KASAN [ 35.334727] CPU: 1 PID: 4500 Comm: syz-executor081 Not tainted 4.18.0-next-20180813+ #37 [ 35.342935] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.352294] RIP: 0010:send_sigio_to_task+0x1ad/0x910 [ 35.357381] Code: 4c 8d b3 00 ff ff ff 48 b8 00 00 00 00 00 fc ff df 49 8d bf 58 06 00 00 4c 89 f2 48 c1 ea 03 c6 04 02 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1a 07 00 00 49 8b 87 58 06 00 00 4c 89 f2 48 c1 [ 35.376296] RSP: 0018:ffff8801d9b5f878 EFLAGS: 00010202 [ 35.381660] RAX: dffffc0000000000 RBX: ffff8801d9b5f9f8 RCX: ffffffff81caeb13 [ 35.388909] RDX: 00000000000000cb RSI: ffffffff81cae4e3 RDI: 0000000000000658 [ 35.396159] RBP: ffff8801d9b5fa20 R08: ffff8801acfee500 R09: ffffed003b6246d6 [ 35.403408] R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffff8801d98e3bc8 [ 35.410656] R13: 0000000000000000 R14: ffff8801d9b5f8f8 R15: 0000000000000000 [ 35.417920] FS: 00007fcc7bf1e700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 35.426125] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.431998] CR2: 00007fcc7bf1de78 CR3: 00000001acdbc000 CR4: 00000000001406e0 [ 35.439247] Call Trace: [ 35.441820] ? send_sigurg_to_task+0x4d0/0x4d0 [ 35.446387] ? __lock_is_held+0xb5/0x140 [ 35.450435] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 35.455964] ? pid_task+0x115/0x200 [ 35.459572] ? find_vpid+0xf0/0xf0 [ 35.463100] ? kasan_check_write+0x14/0x20 [ 35.467318] send_sigio+0x36f/0x4a0 [ 35.470946] ? lock_release+0x9f0/0x9f0 [ 35.474902] ? __x32_compat_sys_fcntl+0x110/0x110 [ 35.479726] ? kasan_check_write+0x14/0x20 [ 35.483942] ? do_raw_spin_lock+0xc1/0x200 [ 35.488161] dnotify_handle_event+0x213/0x360 [ 35.492664] ? lock_release+0x9f0/0x9f0 [ 35.496620] fsnotify+0x97d/0x14e0 [ 35.500182] ? fsnotify_first_mark+0x350/0x350 [ 35.504747] ? down_write+0x130/0x130 [ 35.508541] ? fsnotify+0x14e0/0x14e0 [ 35.512343] iterate_dir+0x4e3/0x5d0 [ 35.516035] ? iterate_dir+0x4e3/0x5d0 [ 35.519906] ksys_getdents64+0x228/0x450 [ 35.523951] ? __ia32_sys_getdents+0x4f0/0x4f0 [ 35.528513] ? iterate_dir+0x5d0/0x5d0 [ 35.532382] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 35.537472] ? trace_hardirqs_off+0xb8/0x2b0 [ 35.541868] __x64_sys_getdents64+0x73/0xb0 [ 35.546173] do_syscall_64+0x1b9/0x820 [ 35.550054] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 35.555447] ? syscall_return_slowpath+0x5e0/0x5e0 [ 35.560395] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 35.565393] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 35.570393] ? recalc_sigpending_tsk+0x180/0x180 [ 35.575129] ? kasan_check_write+0x14/0x20 [ 35.579354] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.584198] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.589370] RIP: 0033:0x4456b9 [ 35.592560] Code: e8 ec b8 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 35.611467] RSP: 002b:00007fcc7bf1dd18 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 [ 35.619179] RAX: ffffffffffffffda RBX: 00000000006dac48 RCX: 00000000004456b9 [ 35.626429] RDX: 0000000000001000 RSI: 0000000020001380 RDI: 0000000000000003 [ 35.633687] RBP: 00000000006dac40 R08: 00007fcc7bf1e700 R09: 0000000000000000 [ 35.640936] R10: 00007fcc7bf1e700 R11: 0000000000000246 R12: 00000000006dac4c [ 35.648186] R13: 00007fcc7bf1dd20 R14: 0000000020000180 R15: 00000000006dad2c [ 35.655440] Modules linked in: [ 35.658633] Dumping ftrace buffer: [ 35.662151] (ftrace buffer empty) [ 35.665948] ---[ end trace 9542b2f908ce9cfa ]--- [ 35.670751] RIP: 0010:send_sigio_to_task+0x1ad/0x910 [ 35.675892] Code: 4c 8d b3 00 ff ff ff 48 b8 00 00 00 00 00 fc ff df 49 8d bf 58 06 00 00 4c 89 f2 48 c1 ea 03 c6 04 02 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1a 07 00 00 49 8b 87 58 06 00 00 4c 89 f2 48 c1 [ 35.694817] RSP: 0018:ffff8801d9b5f878 EFLAGS: 00010202 [ 35.700210] RAX: dffffc0000000000 RBX: ffff8801d9b5f9f8 RCX: ffffffff81caeb13 [ 35.707504] RDX: 00000000000000cb RSI: ffffffff81cae4e3 RDI: 0000000000000658 [ 35.714799] RBP: ffff8801d9b5fa20 R08: ffff8801acfee500 R09: ffffed003b6246d6 [ 35.722098] R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffff8801d98e3bc8 [ 35.729391] R13: 0000000000000000 R14: ffff8801d9b5f8f8 R15: 0000000000000000 [ 35.736685] FS: 00007fcc7bf1e700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 35.744933] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.750836] CR2: 00007fcc7bf1de78 CR3: 00000001acdbc000 CR4: 00000000001406e0 [ 35.758135] Kernel panic - not syncing: Fatal exception [ 35.763775] Dumping ftrace buffer: [ 35.767306] (ftrace buffer empty) [ 35.770999] Kernel Offset: disabled [ 35.774609] Rebooting in 86400 seconds..