[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.260135] 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: [ 26.244840] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.657363] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.257284] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) [ 27.427227] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) Warning: Permanently added '10.128.10.51' (ECDSA) to the list of known hosts. [ 33.145591] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) executing program [ 33.236989] BUG: unable to handle kernel paging request at ffffeafffd3d0008 [ 33.244444] IP: [] page_remove_rmap+0x2e/0x260 [ 33.250810] PGD 0 [ 33.253061] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.258031] Dumping ftrace buffer: [ 33.261544] (ftrace buffer empty) [ 33.265233] Modules linked in: [ 33.268536] CPU: 1 PID: 3827 Comm: syz-executor385 Not tainted 4.4.150-g5541782 #83 [ 33.276381] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.285733] task: ffff8800ade14800 task.stack: ffff8800ada10000 [ 33.291845] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.300531] RSP: 0018:ffff8800ada179c0 EFLAGS: 00010246 [ 33.305955] RAX: dffffc0000000000 RBX: ffffeafffd3d0000 RCX: 0000000000000000 [ 33.313204] RDX: 1ffffd5fffa7a001 RSI: ffffffff814bceaf RDI: ffffeafffd3d0008 [ 33.320568] RBP: ffff8800ada179d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.327817] R10: 0000000000000001 R11: ffff8800ade14800 R12: 0000000000000001 [ 33.335061] R13: 1ffff10015b42f3e R14: ffff8800b1c14800 R15: ffffeafffd3d0000 [ 33.342310] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.350512] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.356367] CR2: ffffeafffd3d0008 CR3: 00000000b1ec7000 CR4: 00000000001606f0 [ 33.363620] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.370874] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.378125] Stack: [ 33.380250] ffff8800ada17c50 0000000000000001 ffff8800ada17a78 ffffffff8150ad13 [ 33.388249] 00003fff4f4001e0 00003fff4f4001e0 0000000041b58ab3 ffffffff841ef837 [ 33.396234] ffffffff8150ab10 00000000000004f0 ffff8800b1ebd1b8 ffff8800ada17a40 [ 33.404218] Call Trace: [ 33.406786] [] zap_huge_pmd+0x203/0x510 [ 33.412383] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.418935] [] unmap_single_vma+0xea3/0x1240 [ 33.424977] [] ? vm_normal_page+0x280/0x280 [ 33.430937] [] ? __put_single_page+0x60/0x60 [ 33.436975] [] unmap_vmas+0x81/0xd0 [ 33.442228] [] exit_mmap+0x1c9/0x3a0 [ 33.447685] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.454172] [] ? up_write+0x1a/0x60 [ 33.459429] [] mmput+0xf8/0x2d0 [ 33.464336] [] do_exit+0x8d8/0x26b0 [ 33.469591] [] ? file_map_prot_check+0x193/0x310 [ 33.476030] [] ? release_task.part.17+0x1200/0x1200 [ 33.482701] [] ? SyS_mprotect+0x41e/0x640 [ 33.488477] [] ? up_write+0x1a/0x60 [ 33.493739] [] ? SyS_mprotect+0x423/0x640 [ 33.499514] [] do_group_exit+0x111/0x330 [ 33.505201] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.511667] [] SyS_exit_group+0x1d/0x20 [ 33.517274] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.523835] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 33.550721] RIP [] page_remove_rmap+0x2e/0x260 [ 33.557060] RSP [ 33.560659] CR2: ffffeafffd3d0008 [ 33.564095] ---[ end trace 6fef211de25de58f ]--- [ 33.568824] Kernel panic - not syncing: Fatal exception [ 33.574591] Dumping ftrace buffer: [ 33.578113] (ftrace buffer empty) [ 33.581796] Kernel Offset: disabled [ 33.585393] Rebooting in 86400 seconds..