[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.901586] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.303446] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.730117] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.449994] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) [ 27.632916] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 33.238083] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) executing program [ 33.322652] BUG: unable to handle kernel paging request at ffffeafff8ba0008 [ 33.330010] IP: [] page_remove_rmap+0x2e/0x260 [ 33.336266] PGD 0 [ 33.338510] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.343460] Dumping ftrace buffer: [ 33.346976] (ftrace buffer empty) [ 33.350661] Modules linked in: [ 33.353947] CPU: 1 PID: 3840 Comm: syz-executor927 Not tainted 4.4.148-gf057ff9 #81 [ 33.361733] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.371064] task: ffff8800bb2cc800 task.stack: ffff8801c9800000 [ 33.377111] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.385787] RSP: 0018:ffff8801c98079c0 EFLAGS: 00010246 [ 33.391208] RAX: dffffc0000000000 RBX: ffffeafff8ba0000 RCX: 0000000000000000 [ 33.398454] RDX: 1ffffd5fff174001 RSI: ffffffff814bc75f RDI: ffffeafff8ba0008 [ 33.405702] RBP: ffff8801c98079d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.412967] R10: 0000000000000001 R11: ffff8800bb2cc800 R12: 0000000000000001 [ 33.420216] R13: 1ffff10039300f3e R14: ffff8801ccbc6800 R15: ffffeafff8ba0000 [ 33.427461] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.435665] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.441536] CR2: ffffeafff8ba0008 CR3: 00000001cbb6d000 CR4: 00000000001606f0 [ 33.448783] Stack: [ 33.450911] ffff8801c9807c50 0000000000000001 ffff8801c9807a78 ffffffff8150a1f3 [ 33.458926] 00003ffe2e8001e0 00003ffe2e8001e0 0000000041b58ab3 ffffffff841ef82f [ 33.466930] ffffffff81509ff0 00000000000004f0 ffff8801cbbd83c8 ffff8801c9807a40 [ 33.474961] Call Trace: [ 33.477537] [] zap_huge_pmd+0x203/0x510 [ 33.483155] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.489710] [] unmap_single_vma+0xea3/0x1240 [ 33.495742] [] ? vm_normal_page+0x230/0x230 [ 33.501693] [] ? __put_single_page+0x60/0x60 [ 33.507727] [] unmap_vmas+0x81/0xd0 [ 33.512980] [] exit_mmap+0x1c9/0x3a0 [ 33.518326] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.524798] [] ? up_write+0x1a/0x60 [ 33.530051] [] mmput+0xf8/0x2d0 [ 33.534976] [] do_exit+0x8d8/0x26b0 [ 33.540234] [] ? file_map_prot_check+0x193/0x310 [ 33.546613] [] ? release_task.part.17+0x1200/0x1200 [ 33.553269] [] ? SyS_mprotect+0x41e/0x640 [ 33.559043] [] ? up_write+0x1a/0x60 [ 33.564296] [] ? SyS_mprotect+0x423/0x640 [ 33.570071] [] do_group_exit+0x111/0x330 [ 33.575760] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.582227] [] SyS_exit_group+0x1d/0x20 [ 33.587827] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.594379] 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 [ 33.621262] RIP [] page_remove_rmap+0x2e/0x260 [ 33.627593] RSP [ 33.631192] CR2: ffffeafff8ba0008 [ 33.634621] ---[ end trace acd5f658b050a4f2 ]--- [ 33.639353] Kernel panic - not syncing: Fatal exception [ 33.645002] Dumping ftrace buffer: [ 33.648526] (ftrace buffer empty) [ 33.652211] Kernel Offset: disabled [ 33.655811] Rebooting in 86400 seconds..