[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.972142] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.091743] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.566621] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 26.231936] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 26.403390] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. [ 32.125395] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 32.219475] BUG: unable to handle kernel paging request at ffffeafff8c70008 [ 32.227209] IP: [] page_remove_rmap+0x2e/0x260 [ 32.233487] PGD 0 [ 32.235753] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.240866] Dumping ftrace buffer: [ 32.244509] (ftrace buffer empty) [ 32.248211] Modules linked in: [ 32.251524] CPU: 0 PID: 3807 Comm: syz-executor344 Not tainted 4.4.148-gf057ff9 #81 [ 32.259473] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.268843] task: ffff8800bb988000 task.stack: ffff8800aea90000 [ 32.274897] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.283831] RSP: 0018:ffff8800aea979c0 EFLAGS: 00010246 [ 32.289276] RAX: dffffc0000000000 RBX: ffffeafff8c70000 RCX: 0000000000000000 [ 32.296676] RDX: 1ffffd5fff18e001 RSI: ffffffff814bc75f RDI: ffffeafff8c70008 [ 32.303935] RBP: ffff8800aea979d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.311277] R10: 0000000000000001 R11: ffff8800bb988000 R12: 0000000000000001 [ 32.318539] R13: 1ffff10015d52f3e R14: ffff8801cf4d9800 R15: ffffeafff8c70000 [ 32.325801] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.334134] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.340138] CR2: ffffeafff8c70008 CR3: 00000001ca1b0000 CR4: 00000000001606f0 [ 32.347401] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.354719] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.361982] Stack: [ 32.364119] ffff8800aea97c50 0000000000000001 ffff8800aea97a78 ffffffff8150a1f3 [ 32.372171] 00003ffe31c001e0 00003ffe31c001e0 0000000041b58ab3 ffffffff841ef82f [ 32.380218] ffffffff81509ff0 00000000000004f0 ffff8801c9d7d0b0 ffff8800aea97a40 [ 32.388342] Call Trace: [ 32.390990] [] zap_huge_pmd+0x203/0x510 [ 32.404556] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.417651] [] unmap_single_vma+0xea3/0x1240 [ 32.423714] [] ? vm_normal_page+0x230/0x230 [ 32.429676] [] ? __put_single_page+0x60/0x60 [ 32.435775] [] unmap_vmas+0x81/0xd0 [ 32.441039] [] exit_mmap+0x1c9/0x3a0 [ 32.446509] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.453043] [] ? up_write+0x1a/0x60 [ 32.458308] [] mmput+0xf8/0x2d0 [ 32.463226] [] do_exit+0x8d8/0x26b0 [ 32.468499] [] ? file_map_prot_check+0x193/0x310 [ 32.474905] [] ? release_task.part.17+0x1200/0x1200 [ 32.481631] [] ? SyS_mprotect+0x41e/0x640 [ 32.487418] [] ? up_write+0x1a/0x60 [ 32.492708] [] ? SyS_mprotect+0x423/0x640 [ 32.498551] [] do_group_exit+0x111/0x330 [ 32.504251] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.510786] [] SyS_exit_group+0x1d/0x20 [ 32.516410] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.522971] 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 [ 32.551096] RIP [] page_remove_rmap+0x2e/0x260 [ 32.557456] RSP [ 32.561068] CR2: ffffeafff8c70008 [ 32.564830] ---[ end trace f7d899bc362dc08c ]--- [ 32.569577] Kernel panic - not syncing: Fatal exception [ 32.575509] Dumping ftrace buffer: [ 32.579048] (ftrace buffer empty) [ 32.582749] Kernel Offset: disabled [ 32.586414] Rebooting in 86400 seconds..