[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.371240] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.067378] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.624821] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.295760] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 28.472578] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts. [ 34.332915] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 34.428624] BUG: unable to handle kernel paging request at ffffeafff8e60008 [ 34.435988] IP: [] page_remove_rmap+0x2e/0x260 [ 34.442240] PGD 0 [ 34.444488] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.449458] Dumping ftrace buffer: [ 34.452971] (ftrace buffer empty) [ 34.456656] Modules linked in: [ 34.459943] CPU: 0 PID: 3848 Comm: syz-executor978 Not tainted 4.4.148-gf057ff9 #81 [ 34.467727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.477063] task: ffff8801d97d0000 task.stack: ffff8801d8e70000 [ 34.483096] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.491787] RSP: 0018:ffff8801d8e779c0 EFLAGS: 00010246 [ 34.497247] RAX: dffffc0000000000 RBX: ffffeafff8e60000 RCX: ffffea0007198000 [ 34.504497] RDX: 1ffffd5fff1cc001 RSI: ffffffff814bc75f RDI: ffffeafff8e60008 [ 34.511744] RBP: ffff8801d8e779d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.518991] R10: 0000000000000001 R11: ffff8801d97d0000 R12: 0000000000000001 [ 34.526239] R13: 1ffff1003b1cef3e R14: ffff8801cacb2810 R15: ffffeafff8e60000 [ 34.533487] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.541689] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.547548] CR2: ffffeafff8e60008 CR3: 00000001d9576000 CR4: 00000000001606f0 [ 34.554813] Stack: [ 34.556938] ffff8801d8e77c50 0000000000000001 ffff8801d8e77a78 ffffffff8150a1f3 [ 34.564940] 00003ffe398001a0 00003ffe398001a0 0000000041b58ab3 ffffffff841ef82f [ 34.572953] ffffffff81509ff0 00000000000004f0 ffff8801caefac60 ffff8801d8e77a40 [ 34.580979] Call Trace: [ 34.583550] [] zap_huge_pmd+0x203/0x510 [ 34.589151] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.595708] [] unmap_single_vma+0xea3/0x1240 [ 34.601769] [] ? vm_normal_page+0x230/0x230 [ 34.607717] [] ? __put_single_page+0x60/0x60 [ 34.613753] [] unmap_vmas+0x81/0xd0 [ 34.619007] [] exit_mmap+0x1c9/0x3a0 [ 34.624349] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.630819] [] ? up_write+0x1a/0x60 [ 34.636073] [] mmput+0xf8/0x2d0 [ 34.640979] [] do_exit+0x8d8/0x26b0 [ 34.646238] [] ? file_map_prot_check+0x193/0x310 [ 34.652616] [] ? release_task.part.17+0x1200/0x1200 [ 34.659260] [] ? SyS_mprotect+0x41e/0x640 [ 34.665036] [] ? up_write+0x1a/0x60 [ 34.670290] [] ? SyS_mprotect+0x423/0x640 [ 34.676062] [] do_group_exit+0x111/0x330 [ 34.681749] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.688224] [] SyS_exit_group+0x1d/0x20 [ 34.693855] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.700405] 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 [ 34.727530] RIP [] page_remove_rmap+0x2e/0x260 [ 34.733876] RSP [ 34.737488] CR2: ffffeafff8e60008 [ 34.740932] ---[ end trace 0699a59237be8fc9 ]--- [ 34.745671] Kernel panic - not syncing: Fatal exception [ 34.751466] Dumping ftrace buffer: [ 34.754996] (ftrace buffer empty) [ 34.758692] Kernel Offset: disabled [ 34.762304] Rebooting in 86400 seconds..