[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.661854] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.878257] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.203675] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.777137] random: sshd: uninitialized urandom read (32 bytes read, 48 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.964863] random: sshd: uninitialized urandom read (32 bytes read, 52 bits of entropy available) Warning: Permanently added '10.128.10.24' (ECDSA) to the list of known hosts. [ 28.532629] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) executing program [ 28.625555] BUG: unable to handle kernel paging request at ffffeafff8d58008 [ 28.632916] IP: [] page_remove_rmap+0x2e/0x260 [ 28.639185] PGD 0 [ 28.641451] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.646434] Dumping ftrace buffer: [ 28.649955] (ftrace buffer empty) [ 28.653639] Modules linked in: [ 28.656939] CPU: 0 PID: 3840 Comm: syz-executor269 Not tainted 4.4.149-gf76bdbd #82 [ 28.664705] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.674035] task: ffff8801c723e000 task.stack: ffff8800ac310000 [ 28.680084] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.688784] RSP: 0018:ffff8800ac3179c0 EFLAGS: 00010246 [ 28.694205] RAX: dffffc0000000000 RBX: ffffeafff8d58000 RCX: 0000000000000000 [ 28.701450] RDX: 1ffffd5fff1ab001 RSI: ffffffff814bc8bf RDI: ffffeafff8d58008 [ 28.708707] RBP: ffff8800ac3179d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.715949] R10: 0000000000000001 R11: ffff8801c723e000 R12: 0000000000000001 [ 28.723196] R13: 1ffff10015862f3e R14: ffff8801cbd61800 R15: ffffeafff8d58000 [ 28.730448] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.738647] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.744503] CR2: ffffeafff8d58008 CR3: 00000001ce3a5000 CR4: 00000000001606f0 [ 28.751777] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.759022] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.766265] Stack: [ 28.768386] ffff8800ac317c50 0000000000000001 ffff8800ac317a78 ffffffff8150a443 [ 28.776365] 00003ffe356001e0 00003ffe356001e0 0000000041b58ab3 ffffffff841ef837 [ 28.784365] ffffffff8150a240 00000000000004f0 ffff8801ce32b3c8 ffff8800ac317a40 [ 28.792362] Call Trace: [ 28.794930] [] zap_huge_pmd+0x203/0x510 [ 28.800542] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.807097] [] unmap_single_vma+0xea3/0x1240 [ 28.813126] [] ? vm_normal_page+0x230/0x230 [ 28.819070] [] ? __put_single_page+0x60/0x60 [ 28.825103] [] unmap_vmas+0x81/0xd0 [ 28.830354] [] exit_mmap+0x1c9/0x3a0 [ 28.835690] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.842157] [] ? up_write+0x1a/0x60 [ 28.847439] [] mmput+0xf8/0x2d0 [ 28.852341] [] do_exit+0x8d8/0x26b0 [ 28.857596] [] ? file_map_prot_check+0x193/0x310 [ 28.863977] [] ? release_task.part.17+0x1200/0x1200 [ 28.870634] [] ? SyS_mprotect+0x41e/0x640 [ 28.876406] [] ? up_write+0x1a/0x60 [ 28.881654] [] ? SyS_mprotect+0x423/0x640 [ 28.887427] [] do_group_exit+0x111/0x330 [ 28.893116] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.899581] [] SyS_exit_group+0x1d/0x20 [ 28.905184] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.911753] 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 [ 28.938651] RIP [] page_remove_rmap+0x2e/0x260 [ 28.944981] RSP [ 28.948577] CR2: ffffeafff8d58008 [ 28.952018] ---[ end trace 4a1dcde9cdc0ae21 ]--- [ 28.956750] Kernel panic - not syncing: Fatal exception [ 28.962433] Dumping ftrace buffer: [ 28.965973] (ftrace buffer empty) [ 28.969656] Kernel Offset: disabled [ 28.973254] Rebooting in 86400 seconds..