[ 18.572674] 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: [ 21.710164] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.885401] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.873744] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) [ 23.049995] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. [ 28.420526] random: nonblocking pool is initialized executing program [ 28.558873] kasan: CONFIG_KASAN_INLINE enabled [ 28.563302] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.576676] Dumping ftrace buffer: [ 28.580195] (ftrace buffer empty) [ 28.583884] Modules linked in: [ 28.587164] CPU: 0 PID: 3639 Comm: syzkaller887516 Not tainted 4.4.119-g024f962 #26 [ 28.594925] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.604250] task: ffff8800b17c6000 task.stack: ffff8800af9e8000 [ 28.610277] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.618509] RSP: 0018:ffff8800af9ef9f0 EFLAGS: 00010a07 [ 28.623926] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b856b [ 28.631181] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.638420] RBP: ffff8800af9efa00 R08: 0000000000000001 R09: 0000000000000001 [ 28.645659] R10: 0000000000000000 R11: 1ffff10015f3df1c R12: 0000000000000004 [ 28.652900] R13: 0000000000000020 R14: ffff8800aff8c200 R15: dffffc0000000000 [ 28.660140] FS: 0000000000bae880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.668335] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.674185] CR2: 000000000043e5b0 CR3: 00000001cdbc4000 CR4: 0000000000160670 [ 28.681426] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.688668] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.695906] Stack: [ 28.698025] 0000000000000246 ffff8800aff8c358 ffff8800af9efa60 ffffffff825b8591 [ 28.705994] ffff8800aff8c370 ffffed0015ff186b ffffed0015ff186e ffff8800aff8c368 [ 28.713960] dead4ead00000000 ffff8800aff8c340 0000000000000000 0000000000000000 [ 28.721925] Call Trace: [ 28.724485] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.730958] [] sg_finish_rem_req+0x2b5/0x340 [ 28.736985] [] sg_new_read.isra.18+0x336/0x3c0 [ 28.743185] [] sg_read+0x8bc/0x1490 [ 28.748432] [] ? __check_object_size+0x154/0x35b [ 28.754806] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.761442] [] ? fsnotify+0xee0/0xee0 [ 28.766865] [] ? avc_policy_seqno+0x9/0x20 [ 28.772721] [] do_loop_readv_writev+0x141/0x1e0 [ 28.779010] [] ? security_file_permission+0x89/0x1e0 [ 28.785733] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.792375] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.799025] [] do_readv_writev+0x5dd/0x6e0 [ 28.804897] [] ? vfs_write+0x530/0x530 [ 28.804904] [] ? sg_ioctl+0x29f0/0x29f0 [ 28.804911] [] ? __vfs_write+0x10b/0x450 [ 28.804920] [] ? quarantine_put+0xab/0x180 [ 28.804926] [] ? putname+0xee/0x130 [ 28.804931] [] ? __fsnotify_parent+0xbc/0x340 [ 28.804939] [] ? avc_policy_seqno+0x9/0x20 [ 28.804944] [] ? fsnotify+0x5ad/0xee0 [ 28.804949] [] ? fsnotify+0xee0/0xee0 [ 28.804954] [] ? rw_verify_area+0x100/0x2f0 [ 28.804960] [] vfs_readv+0x78/0xb0 [ 28.804965] [] SyS_readv+0xd9/0x240 [ 28.804971] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 28.804978] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.804987] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.805075] Code: c6 a0 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 [ 28.805084] RIP [] __free_pages+0x21/0x90 [ 28.805086] RSP [ 28.815822] ---[ end trace 724de72ebc5afcff ]--- [ 28.815826] Kernel panic - not syncing: Fatal exception [ 28.816200] Dumping ftrace buffer: [ 28.816203] (ftrace buffer empty) [ 28.816205] Kernel Offset: disabled [ 28.946357] Rebooting in 86400 seconds..