[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.117197] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.822415] random: sshd: uninitialized urandom read (32 bytes read) [ 21.205691] random: sshd: uninitialized urandom read (32 bytes read) [ 22.049435] random: sshd: uninitialized urandom read (32 bytes read) [ 22.228954] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 27.720571] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.822744] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 27.830744] PGD 1d8f90067 P4D 1d8f90067 PUD 1d01fd067 PMD 0 [ 27.836531] Oops: 0010 [#1] SMP KASAN [ 27.840338] CPU: 1 PID: 4544 Comm: syz-executor767 Not tainted 4.17.0+ #83 [ 27.847325] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.856657] RIP: 0010: (null) [ 27.860518] Code: Bad RIP value. [ 27.863874] RSP: 0018:ffff8801ace4f6d8 EFLAGS: 00010246 [ 27.869222] RAX: 0000000000000000 RBX: ffff8801d4fec480 RCX: ffffffff85e198e9 [ 27.876508] RDX: ffff8801ace4fab0 RSI: ffff8801d4fec480 RDI: ffff8801b00ff2c0 [ 27.883761] RBP: ffff8801ace4f700 R08: ffff8801d91e8640 R09: ffffed0035b34ef0 [ 27.891021] R10: ffffed0035b34ef0 R11: ffff8801ad9a7783 R12: ffff8801acc64000 [ 27.898273] R13: ffff8801b00ff2c0 R14: ffff8801ace4fab0 R15: 0000000000000018 [ 27.905530] FS: 000000000177c880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 27.913733] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.919600] CR2: ffffffffffffffd6 CR3: 00000001cecd5000 CR4: 00000000001406e0 [ 27.926853] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.934099] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.941354] Call Trace: [ 27.943923] ? tls_sw_poll+0xc1/0x140 [ 27.947714] sock_poll+0x1d1/0x710 [ 27.951247] ? tls_sw_splice_read+0x790/0x790 [ 27.955730] ? sock_get_poll_head+0x460/0x460 [ 27.960205] ? __might_sleep+0x95/0x190 [ 27.964155] ? sock_get_poll_head+0x460/0x460 [ 27.968630] vfs_poll+0x77/0x2a0 [ 27.971986] do_sys_poll+0x6fd/0x1100 [ 27.975769] ? compat_core_sys_select+0xae0/0xae0 [ 27.980589] ? flush_rcu_work+0x90/0x90 [ 27.984542] ? print_usage_bug+0xc0/0xc0 [ 27.988583] ? graph_lock+0x170/0x170 [ 27.992359] ? graph_lock+0x170/0x170 [ 27.996151] ? find_held_lock+0x36/0x1c0 [ 28.000208] ? kasan_check_read+0x11/0x20 [ 28.004351] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.008737] ? __local_bh_enable_ip+0x161/0x230 [ 28.013386] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.018380] ? release_sock+0x1e2/0x2b0 [ 28.022417] ? trace_hardirqs_on+0xd/0x10 [ 28.026543] ? __local_bh_enable_ip+0x161/0x230 [ 28.031191] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.035575] ? release_sock+0x1e2/0x2b0 [ 28.039527] ? __release_sock+0x3a0/0x3a0 [ 28.043708] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.049247] ? _copy_from_user+0xdf/0x150 [ 28.053390] ? tls_setsockopt+0xb2/0x720 [ 28.057435] ? sock_common_setsockopt+0x9a/0xe0 [ 28.062089] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.067619] ? poll_select_set_timeout+0x14f/0x220 [ 28.072534] ? do_restart_poll+0x2d0/0x2d0 [ 28.076760] ? kernel_accept+0x310/0x310 [ 28.080810] __x64_sys_poll+0x189/0x510 [ 28.084781] ? __ia32_sys_pselect6+0x270/0x270 [ 28.089341] ? do_syscall_64+0x92/0x800 [ 28.093297] do_syscall_64+0x1b1/0x800 [ 28.097161] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.102070] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.106984] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.112327] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.117149] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.122342] RIP: 0033:0x43ff09 [ 28.125504] 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 [ 28.144614] RSP: 002b:00007ffecea68688 EFLAGS: 00000217 ORIG_RAX: 0000000000000007 [ 28.152319] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043ff09 [ 28.159571] RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000020000000 [ 28.166820] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 28.174066] R10: 0000000000000028 R11: 0000000000000217 R12: 0000000000401830 [ 28.181310] R13: 00000000004018c0 R14: 0000000000000000 R15: 0000000000000000 [ 28.188557] Modules linked in: [ 28.191729] Dumping ftrace buffer: [ 28.195240] (ftrace buffer empty) [ 28.198927] CR2: 0000000000000000 [ 28.202479] ---[ end trace ecf80d6f1459d193 ]--- [ 28.207292] RIP: 0010: (null) [ 28.211176] Code: Bad RIP value. [ 28.214550] RSP: 0018:ffff8801ace4f6d8 EFLAGS: 00010246 [ 28.219908] RAX: 0000000000000000 RBX: ffff8801d4fec480 RCX: ffffffff85e198e9 [ 28.227173] RDX: ffff8801ace4fab0 RSI: ffff8801d4fec480 RDI: ffff8801b00ff2c0 [ 28.234446] RBP: ffff8801ace4f700 R08: ffff8801d91e8640 R09: ffffed0035b34ef0 [ 28.241711] R10: ffffed0035b34ef0 R11: ffff8801ad9a7783 R12: ffff8801acc64000 [ 28.248982] R13: ffff8801b00ff2c0 R14: ffff8801ace4fab0 R15: 0000000000000018 [ 28.256270] FS: 000000000177c880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 28.264492] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.270369] CR2: ffffffffffffffd6 CR3: 00000001cecd5000 CR4: 00000000001406e0 [ 28.277637] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.284901] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.292165] Kernel panic - not syncing: Fatal exception [ 28.297969] Dumping ftrace buffer: [ 28.301486] (ftrace buffer empty) [ 28.305172] Kernel Offset: disabled [ 28.308780] Rebooting in 86400 seconds..