[....] Starting OpenBSD Secure Shell server: sshd[ 23.580702] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.931714] random: sshd: uninitialized urandom read (32 bytes read) [ 28.357257] sshd (4580) used greatest stack depth: 16600 bytes left [ 28.490070] random: sshd: uninitialized urandom read (32 bytes read) [ 29.459370] random: sshd: uninitialized urandom read (32 bytes read) [ 29.643553] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. [ 35.133993] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.234076] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 35.242127] PGD 1d8913067 P4D 1d8913067 PUD 1abe59067 PMD 0 [ 35.247956] Oops: 0010 [#1] SMP KASAN [ 35.251752] CPU: 1 PID: 4595 Comm: syz-executor356 Not tainted 4.17.0+ #83 [ 35.258931] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.268286] RIP: 0010: (null) [ 35.272160] Code: Bad RIP value. [ 35.275528] RSP: 0018:ffff8801d8e0f590 EFLAGS: 00010246 [ 35.280896] RAX: 0000000000000000 RBX: ffff8801d8970800 RCX: 1ffffffff10ea785 [ 35.288164] RDX: ffff8801d8e0fab0 RSI: ffff8801a7ea6040 RDI: ffff8801d9766040 [ 35.295706] RBP: ffff8801d8e0f700 R08: 0000000000000001 R09: 0000000000000000 [ 35.302985] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1003b1c1eb7 [ 35.310552] R13: ffff8801d8e0fab0 R14: ffff8801d8970812 R15: ffff8801d8970c58 [ 35.318000] FS: 000000000216e880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 35.326252] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.332129] CR2: ffffffffffffffd6 CR3: 00000001d89f7000 CR4: 00000000001406e0 [ 35.339495] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.346880] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.354156] Call Trace: [ 35.356764] ? smc_poll+0x211/0xdd0 [ 35.360401] ? __smc_connect+0xa90/0xa90 [ 35.364569] ? kvm_clock_read+0x25/0x30 [ 35.368549] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 35.374113] ? ktime_get_ts64+0x39d/0x510 [ 35.378272] ? do_gettimeofday+0x170/0x170 [ 35.382526] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.388248] ? __fget_light+0x2ef/0x430 [ 35.392323] sock_poll+0x1d1/0x710 [ 35.395974] ? __smc_connect+0xa90/0xa90 [ 35.400059] ? sock_get_poll_head+0x460/0x460 [ 35.404587] ? sock_get_poll_head+0x460/0x460 [ 35.409091] vfs_poll+0x77/0x2a0 [ 35.412544] do_sys_poll+0x6fd/0x1100 [ 35.416360] ? compat_core_sys_select+0xae0/0xae0 [ 35.421212] ? __do_page_fault+0x441/0xe40 [ 35.425448] ? retint_kernel+0x10/0x10 [ 35.429432] ? copy_user_generic_unrolled+0x89/0xc0 [ 35.434455] ? graph_lock+0x170/0x170 [ 35.438255] ? poll_initwait+0x180/0x180 [ 35.442570] ? pvclock_read_flags+0x160/0x160 [ 35.447066] ? dlci_ioctl_set+0x40/0x40 [ 35.451047] ? ktime_get_ts64+0x405/0x510 [ 35.455198] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 35.460215] ? timespec64_add_safe+0x1f4/0x2d0 [ 35.464899] ? nsec_to_clock_t+0x30/0x30 [ 35.468971] ? do_gettimeofday+0x170/0x170 [ 35.473211] ? do_vfs_ioctl+0x1f2/0x16f0 [ 35.477275] ? fget_raw+0x20/0x20 [ 35.480715] ? get_unused_fd_flags+0x121/0x190 [ 35.485299] ? poll_select_set_timeout+0x14f/0x220 [ 35.490244] ? do_restart_poll+0x2d0/0x2d0 [ 35.494470] ? fd_install+0x4d/0x60 [ 35.498089] ? __sys_socket+0x19f/0x250 [ 35.502063] __x64_sys_poll+0x189/0x510 [ 35.506065] ? __ia32_sys_pselect6+0x270/0x270 [ 35.510662] ? do_syscall_64+0x92/0x800 [ 35.514730] do_syscall_64+0x1b1/0x800 [ 35.518620] ? syscall_return_slowpath+0x5c0/0x5c0 [ 35.523728] ? syscall_return_slowpath+0x30f/0x5c0 [ 35.528666] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 35.534032] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.538878] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.544059] RIP: 0033:0x43fd39 [ 35.547319] 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 [ 35.566472] RSP: 002b:00007ffd01e5a948 EFLAGS: 00000217 ORIG_RAX: 0000000000000007 [ 35.574261] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd39 [ 35.581528] RDX: 0000000000000003 RSI: 2000000000000112 RDI: 0000000020000040 [ 35.588789] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 35.596068] R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401660 [ 35.603343] R13: 00000000004016f0 R14: 0000000000000000 R15: 0000000000000000 [ 35.610696] Modules linked in: [ 35.613885] Dumping ftrace buffer: [ 35.617409] (ftrace buffer empty) [ 35.621104] CR2: 0000000000000000 [ 35.624646] ---[ end trace 0e1dfbe96965e4a5 ]--- [ 35.629552] RIP: 0010: (null) [ 35.633464] Code: Bad RIP value. [ 35.636862] RSP: 0018:ffff8801d8e0f590 EFLAGS: 00010246 [ 35.642246] RAX: 0000000000000000 RBX: ffff8801d8970800 RCX: 1ffffffff10ea785 [ 35.649634] RDX: ffff8801d8e0fab0 RSI: ffff8801a7ea6040 RDI: ffff8801d9766040 [ 35.656947] RBP: ffff8801d8e0f700 R08: 0000000000000001 R09: 0000000000000000 [ 35.664346] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1003b1c1eb7 [ 35.671659] R13: ffff8801d8e0fab0 R14: ffff8801d8970812 R15: ffff8801d8970c58 [ 35.678972] FS: 000000000216e880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 35.687217] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.693636] CR2: ffffffffffffffd6 CR3: 00000001d89f7000 CR4: 00000000001406e0 [ 35.700938] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.708383] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.715783] Kernel panic - not syncing: Fatal exception [ 35.721827] Dumping ftrace buffer: [ 35.725357] (ftrace buffer empty) [ 35.729142] Kernel Offset: disabled [ 35.732752] Rebooting in 86400 seconds..