[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.439231] 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: [ 26.343911] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 26.630038] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.159643] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) [ 39.986516] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) Warning: Permanently added '10.128.10.63' (ECDSA) to the list of known hosts. [ 45.443849] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) executing program [ 45.534152] BUG: unable to handle kernel paging request at ffffeafffd248008 [ 45.541563] IP: [] page_remove_rmap+0x2e/0x260 [ 45.547823] PGD 0 [ 45.550082] Oops: 0000 [#1] PREEMPT SMP KASAN [ 45.555165] Dumping ftrace buffer: [ 45.558684] (ftrace buffer empty) [ 45.562379] Modules linked in: [ 45.565681] CPU: 1 PID: 3856 Comm: syz-executor246 Not tainted 4.4.148-gf057ff9 #81 [ 45.573453] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.582795] task: ffff8801d91b3000 task.stack: ffff8801d9360000 [ 45.588835] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 45.597524] RSP: 0018:ffff8801d93679c0 EFLAGS: 00010246 [ 45.602953] RAX: dffffc0000000000 RBX: ffffeafffd248000 RCX: ffffea0002db0000 [ 45.610208] RDX: 1ffffd5fffa49001 RSI: ffffffff814bc75f RDI: ffffeafffd248008 [ 45.617458] RBP: ffff8801d93679d0 R08: ffffffff85302320 R09: 0000000000000000 [ 45.624713] R10: 0000000000000001 R11: ffff8801d91b3000 R12: 0000000000000001 [ 45.631964] R13: 1ffff1003b26cf3e R14: ffff8801cda1e838 R15: ffffeafffd248000 [ 45.639220] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 45.647426] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.653290] CR2: ffffeafffd248008 CR3: 00000001cda64000 CR4: 00000000001606f0 [ 45.660545] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.667799] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.675210] Stack: [ 45.677344] ffff8801d9367c50 0000000000000001 ffff8801d9367a78 ffffffff8150a1f3 [ 45.685652] 00003fff492001a0 00003fff492001a0 0000000041b58ab3 ffffffff841ef82f [ 45.693964] ffffffff81509ff0 00000000000004f0 ffff8801cda14bb0 ffff8801d9367a40 [ 45.702101] Call Trace: [ 45.704677] [] zap_huge_pmd+0x203/0x510 [ 45.710288] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 45.716850] [] unmap_single_vma+0xea3/0x1240 [ 45.722891] [] ? vm_normal_page+0x230/0x230 [ 45.728922] [] ? __put_single_page+0x60/0x60 [ 45.734969] [] unmap_vmas+0x81/0xd0 [ 45.740252] [] exit_mmap+0x1c9/0x3a0 [ 45.745785] [] ? SyS_remap_file_pages+0x870/0x870 [ 45.752263] [] ? up_write+0x1a/0x60 [ 45.757532] [] mmput+0xf8/0x2d0 [ 45.762447] [] do_exit+0x8d8/0x26b0 [ 45.767705] [] ? file_map_prot_check+0x193/0x310 [ 45.774092] [] ? release_task.part.17+0x1200/0x1200 [ 45.780743] [] ? SyS_mprotect+0x41e/0x640 [ 45.786527] [] ? up_write+0x1a/0x60 [ 45.791788] [] ? SyS_mprotect+0x423/0x640 [ 45.797570] [] do_group_exit+0x111/0x330 [ 45.803267] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 45.809739] [] SyS_exit_group+0x1d/0x20 [ 45.815350] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 45.821907] 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 [ 45.849659] RIP [] page_remove_rmap+0x2e/0x260 [ 45.856113] RSP [ 45.859748] CR2: ffffeafffd248008 [ 45.863185] ---[ end trace 2bcfdc16c9a332ff ]--- [ 45.867923] Kernel panic - not syncing: Fatal exception [ 45.873765] Dumping ftrace buffer: [ 45.877287] (ftrace buffer empty) [ 45.880982] Kernel Offset: disabled [ 45.884593] Rebooting in 86400 seconds..