[ 16.332254] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.550450] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.945617] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.747390] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) [ 21.943393] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) Warning: Permanently added '10.128.15.225' (ECDSA) to the list of known hosts. [ 27.341210] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) executing program [ 27.442529] kasan: CONFIG_KASAN_INLINE enabled [ 27.446964] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.459797] Dumping ftrace buffer: [ 27.463309] (ftrace buffer empty) [ 27.466992] Modules linked in: [ 27.470262] CPU: 1 PID: 3318 Comm: syzkaller872156 Not tainted 4.4.107-g610c835 #12 [ 27.478032] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.487360] task: ffff8801d1120000 task.stack: ffff8801d5058000 [ 27.493384] RIP: 0010:[] [] sg_read+0xd1d/0x1490 [ 27.501457] RSP: 0018:ffff8801d505fb00 EFLAGS: 00010246 [ 27.506870] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff825bb194 [ 27.514105] RDX: 0000000000000000 RSI: 00000000200c1024 RDI: ffff8801d1014370 [ 27.521355] RBP: ffff8801d505fc08 R08: 8551c99c2a45b4bd R09: 0000000000000001 [ 27.528608] R10: 0000000000000000 R11: 1ffff1003aa0bf26 R12: 00000000000000a8 [ 27.535848] R13: 0000000000000000 R14: ffff8800b5d58900 R15: ffff8801d1014340 [ 27.543102] FS: 00000000026bd880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.551309] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.557168] CR2: 00000000205f2f80 CR3: 00000001d0f2e000 CR4: 00000000001406e0 [ 27.564407] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.571644] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.578879] Stack: [ 27.581004] 0000000000000000 000077ff80000000 ffff8801d505fb60 ffff8801d1014358 [ 27.588963] 0000000000000008 ffff8801d1014368 00000000000000cc 0000000000000008 [ 27.596936] ffff8800b7cdbb80 0000000000001000 1ffff1003aa0bf6c 00000000200c1024 [ 27.604886] Call Trace: [ 27.607442] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.614073] [] ? fsnotify+0xee0/0xee0 [ 27.619496] [] ? avc_policy_seqno+0x9/0x20 [ 27.625358] [] do_loop_readv_writev+0x141/0x1e0 [ 27.631652] [] ? security_file_permission+0x89/0x1e0 [ 27.638378] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.645024] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.651659] [] do_readv_writev+0x5dd/0x6e0 [ 27.657508] [] ? vfs_write+0x530/0x530 [ 27.663022] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.668976] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.675963] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.682080] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.688889] [] vfs_readv+0x78/0xb0 [ 27.694042] [] SyS_readv+0xd9/0x240 [ 27.699283] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 27.705841] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.712396] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 27.718945] Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 97 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 6b 06 00 00 48 8b 1b 48 85 db 0f 84 3b 03 00 [ 27.745385] RIP [] sg_read+0xd1d/0x1490 [ 27.751114] RSP [ 27.755347] ---[ end trace 361a99ac16e2570f ]--- [ 27.760088] Kernel panic - not syncing: Fatal exception [ 27.765841] Dumping ftrace buffer: [ 27.769350] (ftrace buffer empty) [ 27.773027] Kernel Offset: disabled [ 27.776617] Rebooting in 86400 seconds..