[....] Starting file context mai[ 16.804602] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) ntaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.542793] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.926852] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.744745] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) [ 21.929355] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. [ 27.356380] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.108878] random: nonblocking pool is initialized [ 28.110692] kasan: CONFIG_KASAN_INLINE enabled [ 28.110701] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.110705] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.110709] Dumping ftrace buffer: [ 28.110712] (ftrace buffer empty) [ 28.110715] Modules linked in: [ 28.110722] CPU: 0 PID: 3326 Comm: syzkaller968408 Not tainted 4.4.111-gf851888 #23 [ 28.110725] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.110729] task: ffff8800b5732f80 task.stack: ffff8800b4118000 [ 28.110742] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.110746] RSP: 0018:ffff8800b411f9f0 EFLAGS: 00010a07 [ 28.110750] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 28.110753] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.110756] RBP: ffff8800b411fa00 R08: 0000000000000001 R09: 0000000000000000 [ 28.110759] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.110763] R13: 0000000000000020 R14: ffff8800b9ef4200 R15: dffffc0000000000 [ 28.110768] FS: 00000000007f1880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.110771] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.110775] CR2: 0000000020536000 CR3: 00000000b1460000 CR4: 0000000000160670 [ 28.110780] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.110784] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.110785] Stack: [ 28.110792] 0000000000000000 ffff8800b9ef4358 ffff8800b411fa60 ffffffff825b9ec1 [ 28.110800] ffff8800b9ef4370 ffffed00173de86b ffffed00173de86e ffff8800b9ef4368 [ 28.110806] dead4ead00000000 ffff8800b9ef4340 0000000000000000 0000000000000000 [ 28.110808] Call Trace: [ 28.110817] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.110824] [] sg_finish_rem_req+0x2b5/0x340 [ 28.110830] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.110837] [] ? sg_get_rq_mark+0x142/0x190 [ 28.110843] [] sg_read+0x8c2/0x1490 [ 28.110851] [] ? __check_object_size+0x154/0x35b [ 28.110858] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.110864] [] ? fsnotify+0xee0/0xee0 [ 28.110873] [] ? avc_policy_seqno+0x9/0x20 [ 28.110880] [] do_loop_readv_writev+0x141/0x1e0 [ 28.110886] [] ? security_file_permission+0x89/0x1e0 [ 28.110893] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.110899] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.110906] [] do_readv_writev+0x5dd/0x6e0 [ 28.110912] [] ? vfs_write+0x530/0x530 [ 28.110919] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.110925] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.110932] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.110939] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.110944] [] ? __fsnotify_parent+0xbc/0x340 [ 28.110950] [] ? avc_policy_seqno+0x9/0x20 [ 28.110955] [] ? fsnotify+0x5ad/0xee0 [ 28.110962] [] vfs_readv+0x78/0xb0 [ 28.110967] [] SyS_readv+0xd9/0x240 [ 28.110973] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.110979] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.110985] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.111069] Code: 96 a4 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 28.111075] RIP [] __free_pages+0x21/0x90 [ 28.111077] RSP [ 28.111086] ---[ end trace 58208f5e036570d8 ]--- [ 28.111092] Kernel panic - not syncing: Fatal exception [ 28.481514] Dumping ftrace buffer: [ 28.485029] (ftrace buffer empty) [ 28.488703] Kernel Offset: disabled [ 28.492294] Rebooting in 86400 seconds..