[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.625374] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 22.474146] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.897734] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.440034] random: sshd: uninitialized urandom read (32 bytes read, 46 bits of entropy available) [ 23.599514] random: sshd: uninitialized urandom read (32 bytes read, 49 bits of entropy available) Warning: Permanently added '10.128.0.15' (ECDSA) to the list of known hosts. [ 29.207362] random: sshd: uninitialized urandom read (32 bytes read, 54 bits of entropy available) executing program [ 29.309726] BUG: unable to handle kernel paging request at ffffeafffd2f8008 [ 29.317169] IP: [] page_remove_rmap+0x2e/0x260 [ 29.323414] PGD 0 [ 29.325672] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.330645] Dumping ftrace buffer: [ 29.334167] (ftrace buffer empty) [ 29.337851] Modules linked in: [ 29.341197] CPU: 1 PID: 3815 Comm: syz-executor828 Not tainted 4.4.149-gf76bdbd #18 [ 29.348965] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.358295] task: ffff8800ae180000 task.stack: ffff8800aeb30000 [ 29.364322] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.372993] RSP: 0018:ffff8800aeb37948 EFLAGS: 00010246 [ 29.378429] RAX: dffffc0000000000 RBX: ffffeafffd2f8000 RCX: 0000000000000000 [ 29.385671] RDX: 1ffffd5fffa5f001 RSI: ffffffff814bc8bf RDI: ffffeafffd2f8008 [ 29.392914] RBP: ffff8800aeb37958 R08: ffffffff85333170 R09: 0000000000000000 [ 29.400174] R10: 0000000000000001 R11: ffff8800ae180000 R12: 0000000000000001 [ 29.407419] R13: 1ffff10015d66f2f R14: ffff8800b59a5800 R15: ffffeafffd2f8000 [ 29.414662] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.422888] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.428771] CR2: ffffeafffd2f8008 CR3: 00000000b2e44000 CR4: 00000000001606f0 [ 29.436032] Stack: [ 29.438154] ffff8800aeb37bd8 0000000000000001 ffff8800aeb37a00 ffffffff8150a443 [ 29.446177] 00003fff4be001e0 00003fff4be001e0 0000000041b58ab3 ffffffff841ef837 [ 29.454190] ffffffff8150a240 00000000000004f0 ffff8801d264dcb8 ffff8800aeb379c8 [ 29.462209] Call Trace: [ 29.464769] [] zap_huge_pmd+0x203/0x510 [ 29.470375] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.476928] [] unmap_single_vma+0xea3/0x1240 [ 29.483076] [] ? vm_normal_page+0x230/0x230 [ 29.489042] [] ? __put_single_page+0x60/0x60 [ 29.495083] [] unmap_vmas+0x81/0xd0 [ 29.500351] [] exit_mmap+0x1c9/0x3a0 [ 29.505686] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.512173] [] ? up_write+0x1a/0x60 [ 29.517435] [] mmput+0xf8/0x2d0 [ 29.522349] [] do_exit+0x8d8/0x26b0 [ 29.527600] [] ? file_map_prot_check+0x193/0x310 [ 29.533981] [] ? release_task.part.17+0x1200/0x1200 [ 29.540620] [] ? SyS_mprotect+0x41e/0x640 [ 29.546392] [] ? up_write+0x1a/0x60 [ 29.551645] [] ? SyS_mprotect+0x423/0x640 [ 29.557419] [] do_group_exit+0x111/0x330 [ 29.563101] [] ? do_group_exit+0x330/0x330 [ 29.568958] [] SyS_exit_group+0x1d/0x20 [ 29.574574] [] do_fast_syscall_32+0x324/0x8b0 [ 29.580695] [] sysenter_flags_fixed+0xd/0x1a [ 29.586724] 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 [ 29.613803] RIP [] page_remove_rmap+0x2e/0x260 [ 29.620131] RSP [ 29.623919] CR2: ffffeafffd2f8008 [ 29.627346] ---[ end trace 6a1073905bc6e6b0 ]--- [ 29.632071] Kernel panic - not syncing: Fatal exception [ 29.638150] Dumping ftrace buffer: [ 29.641669] (ftrace buffer empty) [ 29.645353] Kernel Offset: disabled [ 29.648952] Rebooting in 86400 seconds..