[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.366326] 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: [ 26.347432] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.635568] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.356022] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) [ 27.523484] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 33.098923] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) executing program [ 33.183775] BUG: unable to handle kernel paging request at ffffeafff8c78008 [ 33.191141] IP: [] page_remove_rmap+0x2e/0x260 [ 33.197406] PGD 0 [ 33.199652] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.204637] Dumping ftrace buffer: [ 33.208153] (ftrace buffer empty) [ 33.211846] Modules linked in: [ 33.215138] CPU: 0 PID: 3844 Comm: syz-executor457 Not tainted 4.4.148-gf057ff9 #81 [ 33.222910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.232249] task: ffff8800bba44800 task.stack: ffff8801d9788000 [ 33.238287] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.247002] RSP: 0018:ffff8801d978f9c0 EFLAGS: 00010246 [ 33.252432] RAX: dffffc0000000000 RBX: ffffeafff8c78000 RCX: 0000000000000000 [ 33.259688] RDX: 1ffffd5fff18f001 RSI: ffffffff814bc75f RDI: ffffeafff8c78008 [ 33.266961] RBP: ffff8801d978f9d0 R08: ffffffff85333170 R09: 0000000000000000 [ 33.274239] R10: 0000000000000001 R11: ffff8800bba44800 R12: 0000000000000001 [ 33.281492] R13: 1ffff1003b2f1f3e R14: ffff8801ceb85800 R15: ffffeafff8c78000 [ 33.288772] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.296980] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.302841] CR2: ffffeafff8c78008 CR3: 00000001cb545000 CR4: 00000000001606f0 [ 33.310092] Stack: [ 33.312219] ffff8801d978fc50 0000000000000001 ffff8801d978fa78 ffffffff8150a1f3 [ 33.320200] 00003ffe31e001e0 00003ffe31e001e0 0000000041b58ab3 ffffffff841ef82f [ 33.328190] ffffffff81509ff0 00000000000004f0 ffff8801ca47da50 ffff8801d978fa40 [ 33.336178] Call Trace: [ 33.338745] [] zap_huge_pmd+0x203/0x510 [ 33.344352] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.350921] [] unmap_single_vma+0xea3/0x1240 [ 33.356967] [] ? vm_normal_page+0x230/0x230 [ 33.362920] [] ? __put_single_page+0x60/0x60 [ 33.368966] [] unmap_vmas+0x81/0xd0 [ 33.374226] [] exit_mmap+0x1c9/0x3a0 [ 33.379586] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.386063] [] ? up_write+0x1a/0x60 [ 33.391321] [] mmput+0xf8/0x2d0 [ 33.396227] [] do_exit+0x8d8/0x26b0 [ 33.401483] [] ? file_map_prot_check+0x193/0x310 [ 33.407868] [] ? release_task.part.17+0x1200/0x1200 [ 33.414545] [] ? SyS_mprotect+0x41e/0x640 [ 33.420347] [] ? up_write+0x1a/0x60 [ 33.425628] [] ? SyS_mprotect+0x423/0x640 [ 33.431411] [] do_group_exit+0x111/0x330 [ 33.437122] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.443615] [] SyS_exit_group+0x1d/0x20 [ 33.449222] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.455774] 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 [ 33.482657] RIP [] page_remove_rmap+0x2e/0x260 [ 33.489021] RSP [ 33.492620] CR2: ffffeafff8c78008 [ 33.496047] ---[ end trace dd36a59a8ec239fe ]--- [ 33.500774] Kernel panic - not syncing: Fatal exception [ 33.506444] Dumping ftrace buffer: [ 33.509968] (ftrace buffer empty) [ 33.513652] Kernel Offset: disabled [ 33.517254] Rebooting in 86400 seconds..