[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.822720] 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: [ 26.704865] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.204650] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.901854] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 28.077930] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 33.526503] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 33.615640] BUG: unable to handle kernel paging request at ffffeafff8bc8008 [ 33.623123] IP: [] page_remove_rmap+0x2e/0x260 [ 33.629436] PGD 0 [ 33.631795] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.636907] Dumping ftrace buffer: [ 33.640428] (ftrace buffer empty) [ 33.644166] Modules linked in: [ 33.647465] CPU: 0 PID: 3800 Comm: syz-executor414 Not tainted 4.4.148-gf057ff9 #81 [ 33.655237] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.664571] task: ffff8801d96cb000 task.stack: ffff8801c9d08000 [ 33.670600] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.679304] RSP: 0018:ffff8801c9d0f9c0 EFLAGS: 00010246 [ 33.684732] RAX: dffffc0000000000 RBX: ffffeafff8bc8000 RCX: 0000000000000000 [ 33.691984] RDX: 1ffffd5fff179001 RSI: ffffffff814bc75f RDI: ffffeafff8bc8008 [ 33.699535] RBP: ffff8801c9d0f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.706815] R10: 0000000000000001 R11: ffff8801d96cb000 R12: 0000000000000001 [ 33.714063] R13: 1ffff100393a1f3e R14: ffff8801cd8dd800 R15: ffffeafff8bc8000 [ 33.721324] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.729527] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.735444] CR2: ffffeafff8bc8008 CR3: 00000001cd8d8000 CR4: 00000000001606f0 [ 33.742696] Stack: [ 33.744822] ffff8801c9d0fc50 0000000000000001 ffff8801c9d0fa78 ffffffff8150a1f3 [ 33.752824] 00003ffe2f2001e0 00003ffe2f2001e0 0000000041b58ab3 ffffffff841ef82f [ 33.760816] ffffffff81509ff0 00000000000004f0 ffff8801ca7e4948 ffff8801c9d0fa40 [ 33.768815] Call Trace: [ 33.771382] [] zap_huge_pmd+0x203/0x510 [ 33.777195] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.783754] [] unmap_single_vma+0xea3/0x1240 [ 33.789795] [] ? vm_normal_page+0x230/0x230 [ 33.795925] [] ? __put_single_page+0x60/0x60 [ 33.801969] [] unmap_vmas+0x81/0xd0 [ 33.807225] [] exit_mmap+0x1c9/0x3a0 [ 33.812569] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.819049] [] ? up_write+0x1a/0x60 [ 33.824304] [] mmput+0xf8/0x2d0 [ 33.829211] [] do_exit+0x8d8/0x26b0 [ 33.834566] [] ? file_map_prot_check+0x193/0x310 [ 33.841054] [] ? release_task.part.17+0x1200/0x1200 [ 33.847713] [] ? SyS_mprotect+0x41e/0x640 [ 33.853494] [] ? up_write+0x1a/0x60 [ 33.858754] [] ? SyS_mprotect+0x423/0x640 [ 33.864545] [] do_group_exit+0x111/0x330 [ 33.870239] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.876711] [] SyS_exit_group+0x1d/0x20 [ 33.882336] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.888903] 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 [ 33.916068] RIP [] page_remove_rmap+0x2e/0x260 [ 33.922414] RSP [ 33.926014] CR2: ffffeafff8bc8008 [ 33.929461] ---[ end trace 46bee085c0929d7d ]--- [ 33.934292] Kernel panic - not syncing: Fatal exception [ 33.939926] Dumping ftrace buffer: [ 33.943443] (ftrace buffer empty) [ 33.947125] Kernel Offset: disabled [ 33.950727] Rebooting in 86400 seconds..