[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.115178] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.641574] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.084413] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.748651] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 25.923582] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 31.770313] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 31.862674] BUG: unable to handle kernel paging request at ffffeafff8cb0008 [ 31.870036] IP: [] page_remove_rmap+0x2e/0x260 [ 31.876282] PGD 0 [ 31.878547] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.883509] Dumping ftrace buffer: [ 31.887022] (ftrace buffer empty) [ 31.890710] Modules linked in: [ 31.894006] CPU: 1 PID: 3696 Comm: syz-executor651 Not tainted 4.4.149-gf76bdbd #82 [ 31.901768] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.911095] task: ffff8801ce93b000 task.stack: ffff8800b21f0000 [ 31.917134] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.925804] RSP: 0018:ffff8800b21f79c0 EFLAGS: 00010246 [ 31.931238] RAX: dffffc0000000000 RBX: ffffeafff8cb0000 RCX: 0000000000000000 [ 31.938478] RDX: 1ffffd5fff196001 RSI: ffffffff814bc8bf RDI: ffffeafff8cb0008 [ 31.945720] RBP: ffff8800b21f79d0 R08: ffffffff85333170 R09: 0000000000000000 [ 31.952961] R10: 0000000000000001 R11: ffff8801ce93b000 R12: 0000000000000001 [ 31.960203] R13: 1ffff1001643ef3e R14: ffff8801d4239800 R15: ffffeafff8cb0000 [ 31.967454] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.975652] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.981506] CR2: ffffeafff8cb0008 CR3: 00000001cea30000 CR4: 00000000001606f0 [ 31.988748] Stack: [ 31.990870] ffff8800b21f7c50 0000000000000001 ffff8800b21f7a78 ffffffff8150a443 [ 31.998857] 00003ffe32c001e0 00003ffe32c001e0 0000000041b58ab3 ffffffff841ef837 [ 32.006849] ffffffff8150a240 00000000000004f0 ffff8800b212c790 ffff8800b21f7a40 [ 32.014838] Call Trace: [ 32.017398] [] zap_huge_pmd+0x203/0x510 [ 32.022996] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.029552] [] unmap_single_vma+0xea3/0x1240 [ 32.035584] [] ? vm_normal_page+0x230/0x230 [ 32.041530] [] ? __put_single_page+0x60/0x60 [ 32.047558] [] unmap_vmas+0x81/0xd0 [ 32.052811] [] exit_mmap+0x1c9/0x3a0 [ 32.058154] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.064621] [] ? up_write+0x1a/0x60 [ 32.069872] [] mmput+0xf8/0x2d0 [ 32.074779] [] do_exit+0x8d8/0x26b0 [ 32.080035] [] ? file_map_prot_check+0x193/0x310 [ 32.086416] [] ? release_task.part.17+0x1200/0x1200 [ 32.093058] [] ? SyS_mprotect+0x41e/0x640 [ 32.098830] [] ? up_write+0x1a/0x60 [ 32.104111] [] ? SyS_mprotect+0x423/0x640 [ 32.109892] [] do_group_exit+0x111/0x330 [ 32.115577] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.122072] [] SyS_exit_group+0x1d/0x20 [ 32.127687] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.134234] Code: e5 41 54 53 48 89 fb e8 e1 77 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 b3 77 e9 ff f0 83 43 18 ff 78 [ 32.161068] RIP [] page_remove_rmap+0x2e/0x260 [ 32.167393] RSP [ 32.171017] CR2: ffffeafff8cb0008 [ 32.174453] ---[ end trace b6ac02abebd8a62d ]--- [ 32.179177] Kernel panic - not syncing: Fatal exception [ 32.184821] Dumping ftrace buffer: [ 32.188505] (ftrace buffer empty) [ 32.192189] Kernel Offset: disabled [ 32.195826] Rebooting in 86400 seconds..