[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.425324] 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: [ 27.868275] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 28.143509] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 28.841562] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 45.231618] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. [ 50.777728] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 50.870489] BUG: unable to handle kernel paging request at ffffeafff8cc8008 [ 50.877842] IP: [] page_remove_rmap+0x2e/0x260 [ 50.884100] PGD 0 [ 50.886393] Oops: 0000 [#1] PREEMPT SMP KASAN [ 50.891344] Dumping ftrace buffer: [ 50.894854] (ftrace buffer empty) [ 50.898539] Modules linked in: [ 50.901849] CPU: 1 PID: 3709 Comm: syz-executor982 Not tainted 4.4.149-gf76bdbd #82 [ 50.909701] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.919043] task: ffff8801cdcf1800 task.stack: ffff8801cdf40000 [ 50.925081] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 50.933766] RSP: 0018:ffff8801cdf479c0 EFLAGS: 00010246 [ 50.939194] RAX: dffffc0000000000 RBX: ffffeafff8cc8000 RCX: ffffea0007330000 [ 50.946444] RDX: 1ffffd5fff199001 RSI: ffffffff814bc8bf RDI: ffffeafff8cc8008 [ 50.953696] RBP: ffff8801cdf479d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 50.960953] R10: 0000000000000001 R11: ffff8801cdcf1800 R12: 0000000000000001 [ 50.968271] R13: 1ffff10039be8f3e R14: ffff8801d22c8810 R15: ffffeafff8cc8000 [ 50.975535] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 50.983735] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.989592] CR2: ffffeafff8cc8008 CR3: 00000001ceb4b000 CR4: 00000000001606f0 [ 50.996836] Stack: [ 50.998957] ffff8801cdf47c50 0000000000000001 ffff8801cdf47a78 ffffffff8150a443 [ 51.006949] 00003ffe332001a0 00003ffe332001a0 0000000041b58ab3 ffffffff841ef837 [ 51.014942] ffffffff8150a240 00000000000004f0 ffff8801cefa0dc0 ffff8801cdf47a40 [ 51.023035] Call Trace: [ 51.025607] [] zap_huge_pmd+0x203/0x510 [ 51.031210] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 51.038243] [] unmap_single_vma+0xea3/0x1240 [ 51.044282] [] ? vm_normal_page+0x230/0x230 [ 51.050235] [] ? __put_single_page+0x60/0x60 [ 51.056268] [] unmap_vmas+0x81/0xd0 [ 51.061527] [] exit_mmap+0x1c9/0x3a0 [ 51.066871] [] ? SyS_remap_file_pages+0x870/0x870 [ 51.073340] [] ? up_write+0x1a/0x60 [ 51.078596] [] mmput+0xf8/0x2d0 [ 51.083540] [] do_exit+0x8d8/0x26b0 [ 51.088854] [] ? file_map_prot_check+0x193/0x310 [ 51.095249] [] ? release_task.part.17+0x1200/0x1200 [ 51.101896] [] ? SyS_mprotect+0x41e/0x640 [ 51.107672] [] ? up_write+0x1a/0x60 [ 51.112933] [] ? SyS_mprotect+0x423/0x640 [ 51.118750] [] do_group_exit+0x111/0x330 [ 51.124443] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 51.130950] [] SyS_exit_group+0x1d/0x20 [ 51.136556] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 51.143107] 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 [ 51.170180] RIP [] page_remove_rmap+0x2e/0x260 [ 51.176514] RSP [ 51.180112] CR2: ffffeafff8cc8008 [ 51.183541] ---[ end trace 6e0c023577bd6f94 ]--- [ 51.188271] Kernel panic - not syncing: Fatal exception [ 51.193907] Dumping ftrace buffer: [ 51.197429] (ftrace buffer empty) [ 51.201115] Kernel Offset: disabled [ 51.204719] Rebooting in 86400 seconds..