[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.881773] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.392194] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.745997] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 23.396671] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) [ 23.577826] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. [ 29.181894] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) executing program [ 29.278324] BUG: unable to handle kernel paging request at ffffeafff8ba8008 [ 29.285674] IP: [] page_remove_rmap+0x2e/0x260 [ 29.291919] PGD 0 [ 29.294159] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.299108] Dumping ftrace buffer: [ 29.302621] (ftrace buffer empty) [ 29.306304] Modules linked in: [ 29.309592] CPU: 0 PID: 3793 Comm: syz-executor983 Not tainted 4.4.150-g5541782 #83 [ 29.317358] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.326689] task: ffff8800af733000 task.stack: ffff8801d9710000 [ 29.332738] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.341421] RSP: 0018:ffff8801d97179c0 EFLAGS: 00010246 [ 29.346847] RAX: dffffc0000000000 RBX: ffffeafff8ba8000 RCX: 0000000000000000 [ 29.354112] RDX: 1ffffd5fff175001 RSI: ffffffff814bceaf RDI: ffffeafff8ba8008 [ 29.361359] RBP: ffff8801d97179d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 29.368604] R10: 0000000000000001 R11: ffff8800af733000 R12: 0000000000000001 [ 29.375851] R13: 1ffff1003b2e2f3e R14: ffff8801ca08e800 R15: ffffeafff8ba8000 [ 29.383115] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.391318] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.397174] CR2: ffffeafff8ba8008 CR3: 00000001d3fb3000 CR4: 00000000001606f0 [ 29.404420] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.411666] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.418910] Stack: [ 29.421036] ffff8801d9717c50 0000000000000001 ffff8801d9717a78 ffffffff8150ad13 [ 29.429028] 00003ffe2ea001e0 00003ffe2ea001e0 0000000041b58ab3 ffffffff841ef837 [ 29.437064] ffffffff8150ab10 00000000000004f0 ffff8801ca037a50 ffff8801d9717a40 [ 29.445076] Call Trace: [ 29.447651] [] zap_huge_pmd+0x203/0x510 [ 29.453253] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.459810] [] unmap_single_vma+0xea3/0x1240 [ 29.465846] [] ? vm_normal_page+0x280/0x280 [ 29.471793] [] ? __put_single_page+0x60/0x60 [ 29.477825] [] unmap_vmas+0x81/0xd0 [ 29.483077] [] exit_mmap+0x1c9/0x3a0 [ 29.488418] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.494886] [] ? kmem_cache_free+0x2b4/0x340 [ 29.500939] [] mmput+0xf8/0x2d0 [ 29.505853] [] do_exit+0x8d8/0x26b0 [ 29.511107] [] ? file_map_prot_check+0x193/0x310 [ 29.517485] [] ? release_task.part.17+0x1200/0x1200 [ 29.524127] [] ? SyS_mprotect+0x41e/0x640 [ 29.529902] [] ? up_write+0x1a/0x60 [ 29.535156] [] ? SyS_mprotect+0x423/0x640 [ 29.540928] [] do_group_exit+0x111/0x330 [ 29.546621] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.553087] [] SyS_exit_group+0x1d/0x20 [ 29.558686] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.565235] Code: e5 41 54 53 48 89 fb e8 31 76 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 03 76 e9 ff f0 83 43 18 ff 78 [ 29.592147] RIP [] page_remove_rmap+0x2e/0x260 [ 29.598485] RSP [ 29.602084] CR2: ffffeafff8ba8008 [ 29.605511] ---[ end trace b5a6a61a0fd25a4e ]--- [ 29.610238] Kernel panic - not syncing: Fatal exception [ 29.615982] Dumping ftrace buffer: [ 29.619523] (ftrace buffer empty) [ 29.623207] Kernel Offset: disabled [ 29.626808] Rebooting in 86400 seconds..