[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.052772] 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: [ 21.154368] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.351251] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.964496] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 37.419960] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) Warning: Permanently added '10.128.0.48' (ECDSA) to the list of known hosts. [ 42.990249] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 43.093731] capability: warning: `syz-executor519' uses 32-bit capabilities (legacy support in use) [ 43.103497] BUG: unable to handle kernel paging request at ffffeafff8c20008 [ 43.110824] IP: [] page_remove_rmap+0x2e/0x260 [ 43.117070] PGD 0 [ 43.119311] Oops: 0000 [#1] PREEMPT SMP KASAN [ 43.124265] Dumping ftrace buffer: [ 43.127777] (ftrace buffer empty) [ 43.131462] Modules linked in: [ 43.134769] CPU: 0 PID: 3688 Comm: syz-executor519 Not tainted 4.4.149-gf76bdbd #82 [ 43.142538] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.151874] task: ffff8800b3300000 task.stack: ffff8801ceb88000 [ 43.157989] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 43.166812] RSP: 0018:ffff8801ceb8f9c0 EFLAGS: 00010246 [ 43.172239] RAX: dffffc0000000000 RBX: ffffeafff8c20000 RCX: 0000000000000000 [ 43.179482] RDX: 1ffffd5fff184001 RSI: ffffffff814bc8bf RDI: ffffeafff8c20008 [ 43.186725] RBP: ffff8801ceb8f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 43.194079] R10: 0000000000000001 R11: ffff8800b3300000 R12: 0000000000000001 [ 43.201337] R13: 1ffff10039d71f3e R14: ffff8801cecad838 R15: ffffeafff8c20000 [ 43.208584] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 43.216787] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.222650] CR2: ffffeafff8c20008 CR3: 00000001cede7000 CR4: 00000000001606f0 [ 43.229901] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.237151] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.244394] Stack: [ 43.246518] ffff8801ceb8fc50 0000000000000001 ffff8801ceb8fa78 ffffffff8150a443 [ 43.254523] 00003ffe308001e0 00003ffe308001e0 0000000041b58ab3 ffffffff841ef837 [ 43.262521] ffffffff8150a240 00000000000004f0 ffff8801cef48268 ffff8801ceb8fa40 [ 43.270519] Call Trace: [ 43.273100] [] zap_huge_pmd+0x203/0x510 [ 43.278716] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 43.285342] [] unmap_single_vma+0xea3/0x1240 [ 43.291391] [] ? vm_normal_page+0x230/0x230 [ 43.297348] [] ? __put_single_page+0x60/0x60 [ 43.303394] [] unmap_vmas+0x81/0xd0 [ 43.308655] [] exit_mmap+0x1c9/0x3a0 [ 43.314069] [] ? SyS_remap_file_pages+0x870/0x870 [ 43.320549] [] ? up_write+0x1a/0x60 [ 43.325854] [] mmput+0xf8/0x2d0 [ 43.330768] [] do_exit+0x8d8/0x26b0 [ 43.336027] [] ? file_map_prot_check+0x193/0x310 [ 43.342410] [] ? release_task.part.17+0x1200/0x1200 [ 43.349137] [] ? SyS_mprotect+0x41e/0x640 [ 43.355057] [] ? up_write+0x1a/0x60 [ 43.360317] [] ? SyS_mprotect+0x423/0x640 [ 43.366097] [] do_group_exit+0x111/0x330 [ 43.371787] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 43.378267] [] SyS_exit_group+0x1d/0x20 [ 43.383881] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 43.390442] 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 [ 43.417432] RIP [] page_remove_rmap+0x2e/0x260 [ 43.423773] RSP [ 43.427369] CR2: ffffeafff8c20008 [ 43.430795] ---[ end trace 739b2dc822aa9df6 ]--- [ 43.435526] Kernel panic - not syncing: Fatal exception [ 43.441235] Dumping ftrace buffer: [ 43.444761] (ftrace buffer empty) [ 43.448450] Kernel Offset: disabled [ 43.452055] Rebooting in 86400 seconds..