[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.117971] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.757839] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.198370] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.891664] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 26.069746] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. [ 31.639489] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 31.731130] BUG: unable to handle kernel paging request at ffffeafff8bd0008 [ 31.738471] IP: [] page_remove_rmap+0x2e/0x260 [ 31.744715] PGD 0 [ 31.746954] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.751974] Dumping ftrace buffer: [ 31.755497] (ftrace buffer empty) [ 31.759187] Modules linked in: [ 31.762483] CPU: 1 PID: 3784 Comm: syz-executor064 Not tainted 4.4.148-gf057ff9 #81 [ 31.770269] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.779596] task: ffff8800af009800 task.stack: ffff8801d9be8000 [ 31.785624] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.794305] RSP: 0018:ffff8801d9bef9c0 EFLAGS: 00010246 [ 31.799725] RAX: dffffc0000000000 RBX: ffffeafff8bd0000 RCX: 0000000000000000 [ 31.806968] RDX: 1ffffd5fff17a001 RSI: ffffffff814bc75f RDI: ffffeafff8bd0008 [ 31.814210] RBP: ffff8801d9bef9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.821453] R10: 0000000000000001 R11: ffff8800af009800 R12: 0000000000000001 [ 31.828698] R13: 1ffff1003b37df3e R14: ffff8801cd4ec800 R15: ffffeafff8bd0000 [ 31.835944] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.844145] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.850013] CR2: ffffeafff8bd0008 CR3: 00000001da39c000 CR4: 00000000001606f0 [ 31.857258] Stack: [ 31.859381] ffff8801d9befc50 0000000000000001 ffff8801d9befa78 ffffffff8150a1f3 [ 31.867376] 00003ffe2f4001e0 00003ffe2f4001e0 0000000041b58ab3 ffffffff841ef82f [ 31.875365] ffffffff81509ff0 00000000000004f0 ffff8801ce451528 ffff8801d9befa40 [ 31.883369] Call Trace: [ 31.885941] [] zap_huge_pmd+0x203/0x510 [ 31.891552] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.898106] [] unmap_single_vma+0xea3/0x1240 [ 31.904138] [] ? vm_normal_page+0x230/0x230 [ 31.910082] [] ? __put_single_page+0x60/0x60 [ 31.916110] [] unmap_vmas+0x81/0xd0 [ 31.921357] [] exit_mmap+0x1c9/0x3a0 [ 31.926692] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.933170] [] ? up_write+0x1a/0x60 [ 31.938422] [] mmput+0xf8/0x2d0 [ 31.943324] [] do_exit+0x8d8/0x26b0 [ 31.948576] [] ? file_map_prot_check+0x193/0x310 [ 31.954967] [] ? release_task.part.17+0x1200/0x1200 [ 31.961635] [] ? SyS_mprotect+0x41e/0x640 [ 31.967407] [] ? up_write+0x1a/0x60 [ 31.972657] [] ? SyS_mprotect+0x423/0x640 [ 31.978427] [] do_group_exit+0x111/0x330 [ 31.984113] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.990577] [] SyS_exit_group+0x1d/0x20 [ 31.996177] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.002728] 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 [ 32.029546] RIP [] page_remove_rmap+0x2e/0x260 [ 32.035867] RSP [ 32.039465] CR2: ffffeafff8bd0008 [ 32.042892] ---[ end trace c8a2125acc304aba ]--- [ 32.047618] Kernel panic - not syncing: Fatal exception [ 32.053235] Dumping ftrace buffer: [ 32.056755] (ftrace buffer empty) [ 32.060437] Kernel Offset: disabled [ 32.064037] Rebooting in 86400 seconds..