[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.392356] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.449122] random: sshd: uninitialized urandom read (32 bytes read) [ 21.709731] random: sshd: uninitialized urandom read (32 bytes read) [ 22.515637] random: sshd: uninitialized urandom read (32 bytes read) [ 22.676899] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. [ 28.193139] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.289231] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 28.297228] PGD 1d9045067 P4D 1d9045067 PUD 1d9044067 PMD 0 [ 28.303025] Oops: 0010 [#1] SMP KASAN [ 28.306807] CPU: 1 PID: 4525 Comm: syz-executor923 Not tainted 4.18.0-rc2+ #121 [ 28.314229] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.323567] RIP: 0010: (null) [ 28.327432] Code: Bad RIP value. [ 28.330792] RSP: 0018:ffff8801b93ef758 EFLAGS: 00010246 [ 28.336135] RAX: 0000000000000000 RBX: ffff8801d24a70c0 RCX: ffffffff85ec9112 [ 28.343383] RDX: ffff8801b93efab0 RSI: ffff8801d24a70c0 RDI: ffff8801d91d8540 [ 28.350640] RBP: ffff8801b93ef800 R08: ffff8801ac03a200 R09: ffffed0036145d80 [ 28.357896] R10: ffffed0036145d80 R11: ffff8801b0a2ec03 R12: ffff8801b93efab0 [ 28.365149] R13: ffff8801d91d8540 R14: ffffffff8818a920 R15: ffff8801d90d40c0 [ 28.372398] FS: 000000000159d880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 28.380605] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.386481] CR2: ffffffffffffffd6 CR3: 00000001ac07a000 CR4: 00000000001406e0 [ 28.393732] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.400977] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.408230] Call Trace: [ 28.410800] ? sock_poll+0x2e1/0x490 [ 28.414498] ? kernel_sendpage_locked+0x120/0x120 [ 28.419330] ? kernel_sendpage_locked+0x120/0x120 [ 28.424152] do_sys_poll+0x74d/0x1180 [ 28.427934] ? compat_core_sys_select+0xb10/0xb10 [ 28.432763] ? __thp_get_unmapped_area+0x180/0x180 [ 28.437680] ? graph_lock+0x170/0x170 [ 28.441465] ? graph_lock+0x170/0x170 [ 28.445253] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.450770] ? find_held_lock+0x36/0x1c0 [ 28.454809] ? poll_initwait+0x180/0x180 [ 28.458853] ? pvclock_read_flags+0x160/0x160 [ 28.463340] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 28.468336] ? timespec64_add_safe+0x204/0x2f0 [ 28.472897] ? nsec_to_clock_t+0x30/0x30 [ 28.476936] ? do_gettimeofday+0x180/0x180 [ 28.481159] ? poll_select_set_timeout+0x156/0x240 [ 28.486069] ? do_restart_poll+0x2e0/0x2e0 [ 28.490288] __x64_sys_poll+0x197/0x530 [ 28.494248] ? __ia32_sys_pselect6+0x270/0x270 [ 28.498819] ? do_syscall_64+0x9a/0x820 [ 28.502771] do_syscall_64+0x1b9/0x820 [ 28.506640] ? syscall_return_slowpath+0x5e0/0x5e0 [ 28.511550] ? syscall_return_slowpath+0x31d/0x5e0 [ 28.516466] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.521982] ? retint_user+0x18/0x18 [ 28.525678] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.530501] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.535666] RIP: 0033:0x43fd09 [ 28.538829] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00 [ 28.557941] RSP: 002b:00007fff828fa898 EFLAGS: 00000213 ORIG_RAX: 0000000000000007 [ 28.565639] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd09 [ 28.572885] RDX: 0000000000000006 RSI: 0000000000000003 RDI: 0000000020003900 [ 28.580138] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 28.587403] R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401630 [ 28.594667] R13: 00000000004016c0 R14: 0000000000000000 R15: 0000000000000000 [ 28.601920] Modules linked in: [ 28.605090] Dumping ftrace buffer: [ 28.608603] (ftrace buffer empty) [ 28.612288] CR2: 0000000000000000 [ 28.615957] ---[ end trace 0b221bd7ffe4cbd9 ]--- [ 28.620725] RIP: 0010: (null) [ 28.624620] Code: Bad RIP value. [ 28.628031] RSP: 0018:ffff8801b93ef758 EFLAGS: 00010246 [ 28.633428] RAX: 0000000000000000 RBX: ffff8801d24a70c0 RCX: ffffffff85ec9112 [ 28.640726] RDX: ffff8801b93efab0 RSI: ffff8801d24a70c0 RDI: ffff8801d91d8540 [ 28.647997] RBP: ffff8801b93ef800 R08: ffff8801ac03a200 R09: ffffed0036145d80 [ 28.655360] R10: ffffed0036145d80 R11: ffff8801b0a2ec03 R12: ffff8801b93efab0 [ 28.662642] R13: ffff8801d91d8540 R14: ffffffff8818a920 R15: ffff8801d90d40c0 [ 28.669933] FS: 000000000159d880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 28.678159] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.684053] CR2: ffffffffffffffd6 CR3: 00000001ac07a000 CR4: 00000000001406e0 [ 28.691323] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.700519] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.707806] Kernel panic - not syncing: Fatal exception [ 28.713617] Dumping ftrace buffer: [ 28.717146] (ftrace buffer empty) [ 28.720849] Kernel Offset: disabled [ 28.724461] Rebooting in 86400 seconds..