[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.885692] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.204862] random: sshd: uninitialized urandom read (32 bytes read) [ 22.497496] random: sshd: uninitialized urandom read (32 bytes read) [ 23.251241] random: sshd: uninitialized urandom read (32 bytes read) [ 40.708615] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 46.140708] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 46.243578] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 46.251566] PGD 1b64da067 P4D 1b64da067 PUD 1b64d2067 PMD 0 [ 46.257353] Oops: 0010 [#1] SMP KASAN [ 46.261133] CPU: 1 PID: 4473 Comm: syz-executor872 Not tainted 4.17.0+ #92 [ 46.268121] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.277453] RIP: 0010: (null) [ 46.281314] Code: Bad RIP value. [ 46.284664] RSP: 0018:ffff8801cf02f590 EFLAGS: 00010246 [ 46.290098] RAX: 0000000000000000 RBX: ffff8801b633c800 RCX: 1ffffffff10ea8e5 [ 46.297358] RDX: ffff8801cf02fab0 RSI: ffff8801aee4c080 RDI: ffff8801b5e34540 [ 46.304610] RBP: ffff8801cf02f700 R08: 0000000000000001 R09: 0000000000000000 [ 46.312071] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10039e05eb7 [ 46.320035] R13: ffff8801cf02fab0 R14: ffff8801b633c812 R15: ffff8801b633cc58 [ 46.327284] FS: 0000000001366880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 46.335487] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.341344] CR2: ffffffffffffffd6 CR3: 00000001b68d2000 CR4: 00000000001406e0 [ 46.348687] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.356039] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.363303] Call Trace: [ 46.365886] ? smc_poll+0x211/0xdd0 [ 46.369506] ? find_held_lock+0x36/0x1c0 [ 46.373554] ? __smc_connect+0xa90/0xa90 [ 46.377594] ? kvm_clock_read+0x25/0x30 [ 46.381549] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 46.387070] ? ktime_get_ts64+0x39d/0x510 [ 46.391196] ? do_gettimeofday+0x170/0x170 [ 46.395418] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.400933] ? __fget_light+0x2ef/0x430 [ 46.404885] sock_poll+0x1d1/0x710 [ 46.408497] ? __smc_connect+0xa90/0xa90 [ 46.412540] ? sock_get_poll_head+0x460/0x460 [ 46.417016] ? sock_get_poll_head+0x460/0x460 [ 46.421491] vfs_poll+0x77/0x2a0 [ 46.424834] do_sys_poll+0x6fd/0x1100 [ 46.428614] ? compat_core_sys_select+0xae0/0xae0 [ 46.433440] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 46.438546] ? graph_lock+0x170/0x170 [ 46.442341] ? graph_lock+0x170/0x170 [ 46.446131] ? poll_initwait+0x180/0x180 [ 46.450180] ? pvclock_read_flags+0x160/0x160 [ 46.454660] ? ktime_get_ts64+0x405/0x510 [ 46.459924] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 46.464924] ? timespec64_add_safe+0x1f4/0x2d0 [ 46.469486] ? nsec_to_clock_t+0x30/0x30 [ 46.473539] ? do_gettimeofday+0x170/0x170 [ 46.477874] ? poll_select_set_timeout+0x14f/0x220 [ 46.482784] ? do_restart_poll+0x2d0/0x2d0 [ 46.487000] __x64_sys_poll+0x189/0x510 [ 46.490967] ? __ia32_sys_pselect6+0x270/0x270 [ 46.495547] ? do_syscall_64+0x92/0x800 [ 46.499506] do_syscall_64+0x1b1/0x800 [ 46.503381] ? syscall_return_slowpath+0x5c0/0x5c0 [ 46.508297] ? syscall_return_slowpath+0x30f/0x5c0 [ 46.513212] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.518741] ? retint_user+0x18/0x18 [ 46.522436] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.527257] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.532424] RIP: 0033:0x43fcc9 [ 46.535589] 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 [ 46.554719] RSP: 002b:00007ffee8e840c8 EFLAGS: 00000213 ORIG_RAX: 0000000000000007 [ 46.562767] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcc9 [ 46.570017] RDX: 0000000000000003 RSI: 2000000000000112 RDI: 0000000020000040 [ 46.577270] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 46.584542] R10: 00000000004002c8 R11: 0000000000000213 R12: 00000000004015f0 [ 46.591798] R13: 0000000000401680 R14: 0000000000000000 R15: 0000000000000000 [ 46.599050] Modules linked in: [ 46.602232] Dumping ftrace buffer: [ 46.605748] (ftrace buffer empty) [ 46.609456] CR2: 0000000000000000 [ 46.612947] ---[ end trace 7d92c09f2d8d49a5 ]--- [ 46.617704] RIP: 0010: (null) [ 46.621588] Code: Bad RIP value. [ 46.624960] RSP: 0018:ffff8801cf02f590 EFLAGS: 00010246 [ 46.630329] RAX: 0000000000000000 RBX: ffff8801b633c800 RCX: 1ffffffff10ea8e5 [ 46.637594] RDX: ffff8801cf02fab0 RSI: ffff8801aee4c080 RDI: ffff8801b5e34540 [ 46.644869] RBP: ffff8801cf02f700 R08: 0000000000000001 R09: 0000000000000000 [ 46.652157] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10039e05eb7 [ 46.659437] R13: ffff8801cf02fab0 R14: ffff8801b633c812 R15: ffff8801b633cc58 [ 46.666721] FS: 0000000001366880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 46.674950] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.680826] CR2: ffffffffffffffd6 CR3: 00000001b68d2000 CR4: 00000000001406e0 [ 46.688110] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.695400] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.702706] Kernel panic - not syncing: Fatal exception [ 46.708662] Dumping ftrace buffer: [ 46.712180] (ftrace buffer empty) [ 46.715871] Kernel Offset: disabled [ 46.719477] Rebooting in 86400 seconds..