[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.819899] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ 19.908941] random: sshd: uninitialized urandom read (32 bytes read) [ ok 8[?25h[?0c. [ 20.258983] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.089156] random: sshd: uninitialized urandom read (32 bytes read) [ 21.238915] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. [ 26.767130] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.867615] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 26.875609] PGD 1cfaa6067 P4D 1cfaa6067 PUD 1ac95b067 PMD 0 [ 26.881414] Oops: 0010 [#1] SMP KASAN [ 26.885209] CPU: 1 PID: 4552 Comm: syz-executor431 Not tainted 4.18.0-rc2+ #24 [ 26.892569] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.901941] RIP: 0010: (null) [ 26.905827] Code: Bad RIP value. [ 26.909192] RSP: 0018:ffff8801c2dd7708 EFLAGS: 00010246 [ 26.914577] RAX: 0000000000000000 RBX: ffff8801a8156040 RCX: ffffffff85ec9112 [ 26.921842] RDX: ffff8801c2dd7a60 RSI: ffff8801a8156040 RDI: ffff8801ad7965c0 [ 26.929105] RBP: ffff8801c2dd77b0 R08: ffff8801acb002c0 R09: ffffed0039b5e508 [ 26.936365] R10: ffffed0039b5e508 R11: ffff8801cdaf2843 R12: ffff8801c2dd7a60 [ 26.943626] R13: ffff8801ad7965c0 R14: ffffffff8818a920 R15: ffff8801ac13b1c0 [ 26.950904] FS: 0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:0000000008e70840 [ 26.959133] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.965003] CR2: ffffffffffffffd6 CR3: 00000001ac95a000 CR4: 00000000001406e0 [ 26.972266] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.979521] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.986781] Call Trace: [ 26.989369] ? sock_poll+0x2e1/0x490 [ 26.993082] ? kernel_sendpage_locked+0x120/0x120 [ 26.997925] ? kernel_sendpage_locked+0x120/0x120 [ 27.002755] do_sys_poll+0x74d/0x1180 [ 27.006574] ? compat_core_sys_select+0xb10/0xb10 [ 27.011411] ? __thp_get_unmapped_area+0x180/0x180 [ 27.016331] ? graph_lock+0x170/0x170 [ 27.020115] ? graph_lock+0x170/0x170 [ 27.023908] ? pud_val+0x88/0x100 [ 27.027340] ? pmd_val+0x100/0x100 [ 27.030872] ? find_held_lock+0x36/0x1c0 [ 27.034915] ? poll_initwait+0x180/0x180 [ 27.038974] ? pvclock_read_flags+0x160/0x160 [ 27.043463] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 27.048465] ? timespec64_add_safe+0x204/0x2f0 [ 27.053038] ? nsec_to_clock_t+0x30/0x30 [ 27.057094] ? do_gettimeofday+0x180/0x180 [ 27.061312] ? handle_mm_fault+0x55d/0xc80 [ 27.065546] ? poll_select_set_timeout+0x156/0x240 [ 27.070475] ? do_restart_poll+0x2e0/0x2e0 [ 27.074698] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.080234] __ia32_sys_poll+0x196/0x520 [ 27.084288] ? __x64_sys_poll+0x530/0x530 [ 27.088430] ? do_fast_syscall_32+0x150/0xfb2 [ 27.092921] do_fast_syscall_32+0x34d/0xfb2 [ 27.097228] ? do_int80_syscall_32+0x890/0x890 [ 27.101803] ? do_syscall_64+0x497/0x820 [ 27.105846] ? syscall_slow_exit_work+0x500/0x500 [ 27.110673] ? syscall_return_slowpath+0x5e0/0x5e0 [ 27.115586] ? syscall_return_slowpath+0x31d/0x5e0 [ 27.120500] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.126041] ? retint_user+0x18/0x18 [ 27.129751] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.134581] entry_SYSENTER_compat+0x70/0x7f [ 27.138982] RIP: 0023:0xf7faacb9 [ 27.142333] Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 27.161460] RSP: 002b:00000000ffa05bfc EFLAGS: 00000213 ORIG_RAX: 00000000000000a8 [ 27.170801] RAX: ffffffffffffffda RBX: 0000000020003900 RCX: 0000000000000003 [ 27.178154] RDX: 0000000000000006 RSI: 0000000000000032 RDI: 00000000ffffffff [ 27.185413] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 27.192662] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000000000 [ 27.199930] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 27.207198] Modules linked in: [ 27.210387] Dumping ftrace buffer: [ 27.213906] (ftrace buffer empty) [ 27.217601] CR2: 0000000000000000 [ 27.221148] ---[ end trace 73c98fdb1ef640b5 ]--- [ 27.225926] RIP: 0010: (null) [ 27.229810] Code: Bad RIP value. [ 27.233201] RSP: 0018:ffff8801c2dd7708 EFLAGS: 00010246 [ 27.238591] RAX: 0000000000000000 RBX: ffff8801a8156040 RCX: ffffffff85ec9112 [ 27.245882] RDX: ffff8801c2dd7a60 RSI: ffff8801a8156040 RDI: ffff8801ad7965c0 [ 27.253177] RBP: ffff8801c2dd77b0 R08: ffff8801acb002c0 R09: ffffed0039b5e508 [ 27.260736] R10: ffffed0039b5e508 R11: ffff8801cdaf2843 R12: ffff8801c2dd7a60 [ 27.268036] R13: ffff8801ad7965c0 R14: ffffffff8818a920 R15: ffff8801ac13b1c0 [ 27.275343] FS: 0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:0000000008e70840 [ 27.283581] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.289477] CR2: ffffffffffffffd6 CR3: 00000001ac95a000 CR4: 00000000001406e0 [ 27.296759] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.304056] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.311336] Kernel panic - not syncing: Fatal exception [ 27.317301] Dumping ftrace buffer: [ 27.320826] (ftrace buffer empty) [ 27.324516] Kernel Offset: disabled [ 27.328143] Rebooting in 86400 seconds..