[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.126446] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.591052] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.839257] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.837203] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) [ 23.015065] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) Warning: Permanently added '10.128.0.48' (ECDSA) to the list of known hosts. [ 28.381890] random: nonblocking pool is initialized executing program [ 28.492225] kasan: CONFIG_KASAN_INLINE enabled [ 28.496640] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.509460] Dumping ftrace buffer: [ 28.512968] (ftrace buffer empty) [ 28.516671] Modules linked in: [ 28.519953] CPU: 0 PID: 3776 Comm: syzkaller122484 Not tainted 4.4.119-g855ea74 #27 [ 28.527709] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.537032] task: ffff8801c5394800 task.stack: ffff8800abe18000 [ 28.543061] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.551292] RSP: 0018:ffff8800abe1f9f0 EFLAGS: 00010a07 [ 28.556705] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b856b [ 28.563944] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 28.571181] RBP: ffff8800abe1fa00 R08: 0000000048000000 R09: 0000000000001e30 [ 28.578427] R10: 0000000000002100 R11: 1ffff100157c3f1c R12: 0000000000000004 [ 28.585665] R13: 0000000000000020 R14: ffff8800b0fd2100 R15: dffffc0000000000 [ 28.592903] FS: 0000000001983880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.601094] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.606942] CR2: 0000000020a2afe3 CR3: 00000000ae9be000 CR4: 0000000000160670 [ 28.614181] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.621420] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.629169] Stack: [ 28.631285] 0000000000000246 ffff8800b0fd2258 ffff8800abe1fa60 ffffffff825b8591 [ 28.639248] ffff8800b0fd2270 ffffed00161fa44b ffffed00161fa44e ffff8800b0fd2268 [ 28.647208] dead4ead00000000 ffff8800b0fd2240 0000000000000000 0000000000000000 [ 28.655165] Call Trace: [ 28.657727] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.664186] [] sg_finish_rem_req+0x2b5/0x340 [ 28.670212] [] sg_new_read.isra.18+0x17d/0x3c0 [ 28.676409] [] sg_read+0x8bc/0x1490 [ 28.681654] [] ? __check_object_size+0x154/0x35b [ 28.688027] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.694657] [] ? fsnotify+0xee0/0xee0 [ 28.700076] [] ? avc_policy_seqno+0x9/0x20 [ 28.705926] [] do_loop_readv_writev+0x141/0x1e0 [ 28.712210] [] ? security_file_permission+0x89/0x1e0 [ 28.718928] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.725559] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.732188] [] do_readv_writev+0x5dd/0x6e0 [ 28.738037] [] ? vfs_write+0x530/0x530 [ 28.743542] [] ? sg_ioctl+0x29f0/0x29f0 [ 28.749135] [] ? __vfs_write+0x10b/0x450 [ 28.754813] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.760926] [] ? putname+0xee/0x130 [ 28.766169] [] ? __fsnotify_parent+0xbc/0x340 [ 28.772280] [] ? avc_policy_seqno+0x9/0x20 [ 28.778128] [] ? fsnotify+0x5ad/0xee0 [ 28.783545] [] ? fsnotify+0xee0/0xee0 [ 28.788967] [] ? rw_verify_area+0x100/0x2f0 [ 28.794905] [] vfs_readv+0x78/0xb0 [ 28.800061] [] SyS_readv+0xd9/0x240 [ 28.805306] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 28.811853] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.818313] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.824858] 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 [ 28.851368] RIP [] __free_pages+0x21/0x90 [ 28.857249] RSP [ 28.861075] ---[ end trace afa539f87799a3b7 ]--- [ 28.865816] Kernel panic - not syncing: Fatal exception [ 28.871579] Dumping ftrace buffer: [ 28.875093] (ftrace buffer empty) [ 28.878771] Kernel Offset: disabled [ 28.882362] Rebooting in 86400 seconds..