[ 16.886898] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.452745] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.864461] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 23.555667] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 23.734673] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. [ 29.124915] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 29.228636] sg_write: data in/out 1219236422/100 bytes for SCSI command 0xc4-- guessing data in; [ 29.228636] program syzkaller415849 not setting count and/or reply_len properly [ 29.246027] kasan: CONFIG_KASAN_INLINE enabled [ 29.250423] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.263397] Dumping ftrace buffer: [ 29.266916] (ftrace buffer empty) [ 29.270611] Modules linked in: [ 29.273903] CPU: 1 PID: 3323 Comm: syzkaller415849 Not tainted 4.4.107-g610c835 #12 [ 29.281678] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.291017] task: ffff8800b498c740 task.stack: ffff8800b1170000 [ 29.297055] RIP: 0010:[] [] sg_read+0xd1d/0x1490 [ 29.305144] RSP: 0018:ffff8800b1177600 EFLAGS: 00010246 [ 29.310592] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff825bb194 [ 29.317848] RDX: 0000000000000000 RSI: ffff8801d222a024 RDI: ffff8801d1348170 [ 29.325101] RBP: ffff8800b1177708 R08: 0000000000000000 R09: ffff8800b400fba0 [ 29.332354] R10: 0000000000000005 R11: ffffed0016801f78 R12: 0000000000000fdc [ 29.339609] R13: 0000000000000000 R14: ffff8800b400fba0 R15: ffff8801d1348140 [ 29.346878] FS: 0000000001cf5880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.355084] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.361033] CR2: 0000000020df7000 CR3: 00000001d2ad5000 CR4: 00000000001406e0 [ 29.368285] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.375527] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.382771] Stack: [ 29.384883] 0000000000000000 000077ff80000000 ffff8800b1177660 ffff8801d1348158 [ 29.392836] ffffffff810002b8 ffff8801d1348168 0000000000001000 0000000000000010 [ 29.400791] ffff8800b7e3d180 ffff880100001000 1ffff1001622eecc ffff8801d222a024 [ 29.408745] Call Trace: [ 29.411297] [] ? 0xffffffff810002b8 [ 29.416557] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.423190] [] ? fsnotify+0xee0/0xee0 [ 29.428611] [] ? avc_policy_seqno+0x9/0x20 [ 29.434470] [] do_loop_readv_writev+0x141/0x1e0 [ 29.440756] [] ? security_file_permission+0x89/0x1e0 [ 29.447479] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.454118] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.461188] [] do_readv_writev+0x5dd/0x6e0 [ 29.467039] [] ? vfs_write+0x530/0x530 [ 29.473400] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 29.480555] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 29.487381] [] ? _raw_write_unlock_irqrestore+0x45/0x70 [ 29.494369] [] ? sg_remove_request+0xde/0x110 [ 29.500481] [] ? sg_finish_rem_req+0x295/0x340 [ 29.506705] [] ? sg_common_write.isra.21+0xcb8/0x18d0 [ 29.513523] [] vfs_readv+0x78/0xb0 [ 29.518687] [] default_file_splice_read+0x4fa/0x8e0 [ 29.525329] [] ? vprintk+0x28/0x30 [ 29.530489] [] ? generic_file_splice_read+0x1c0/0x1c0 [ 29.537300] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 29.544110] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 29.551106] [] ? page_cache_pipe_buf_release+0x70/0x70 [ 29.558004] [] ? sg_write+0x6d3/0xb70 [ 29.563426] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 29.570414] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 29.577569] [] ? __lock_is_held+0xa1/0xf0 [ 29.583427] [] ? __lock_is_held+0xa1/0xf0 [ 29.589192] [] ? check_preemption_disabled+0x3b/0x200 [ 29.596009] [] ? security_file_permission+0x89/0x1e0 [ 29.602733] [] ? generic_file_splice_read+0x1c0/0x1c0 [ 29.609542] [] do_splice_to+0xf5/0x140 [ 29.615055] [] SyS_splice+0x1009/0x14b0 [ 29.620665] [] ? vfs_write+0x227/0x530 [ 29.626172] [] ? compat_SyS_vmsplice+0x240/0x240 [ 29.632629] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.639086] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 29.645629] 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 [ 29.671989] RIP [] sg_read+0xd1d/0x1490 [ 29.677705] RSP [ 29.681415] ---[ end trace 7d7b0187983fe8af ]--- [ 29.686142] Kernel panic - not syncing: Fatal exception [ 29.691831] Dumping ftrace buffer: [ 29.695345] (ftrace buffer empty) [ 29.699024] Kernel Offset: disabled [ 29.702623] Rebooting in 86400 seconds..