[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.237705] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.815351] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.359716] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available) [ 28.067320] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 28.234418] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. [ 33.740847] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 33.828809] BUG: unable to handle kernel paging request at ffffeafffd420008 [ 33.836196] IP: [] page_remove_rmap+0x2e/0x260 [ 33.842457] PGD 0 [ 33.844696] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.849816] Dumping ftrace buffer: [ 33.853352] (ftrace buffer empty) [ 33.857044] Modules linked in: [ 33.860332] CPU: 0 PID: 3861 Comm: syz-executor105 Not tainted 4.4.149-gf76bdbd #18 [ 33.868097] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.877426] task: ffff8801d96e3000 task.stack: ffff8800abff0000 [ 33.883452] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.892145] RSP: 0018:ffff8800abff7948 EFLAGS: 00010246 [ 33.897567] RAX: dffffc0000000000 RBX: ffffeafffd420000 RCX: 0000000000000000 [ 33.904811] RDX: 1ffffd5fffa84001 RSI: ffffffff814bc8bf RDI: ffffeafffd420008 [ 33.912056] RBP: ffff8800abff7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.919321] R10: 0000000000000001 R11: ffff8801d96e3000 R12: 0000000000000001 [ 33.926569] R13: 1ffff100157fef2f R14: ffff8800b4151800 R15: ffffeafffd420000 [ 33.933833] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.942032] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.947886] CR2: ffffeafffd420008 CR3: 00000000b3a64000 CR4: 00000000001606f0 [ 33.955149] Stack: [ 33.957273] ffff8800abff7bd8 0000000000000001 ffff8800abff7a00 ffffffff8150a443 [ 33.965251] 00003fff508001e0 00003fff508001e0 0000000041b58ab3 ffffffff841ef837 [ 33.973243] ffffffff8150a240 00000000000004f0 ffff8800b38f2160 ffff8800abff79c8 [ 33.981224] Call Trace: [ 33.983789] [] zap_huge_pmd+0x203/0x510 [ 33.989390] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.995944] [] unmap_single_vma+0xea3/0x1240 [ 34.001978] [] ? vm_normal_page+0x230/0x230 [ 34.007930] [] ? __put_single_page+0x60/0x60 [ 34.013962] [] unmap_vmas+0x81/0xd0 [ 34.019237] [] exit_mmap+0x1c9/0x3a0 [ 34.024576] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.031063] [] ? up_write+0x1a/0x60 [ 34.036315] [] mmput+0xf8/0x2d0 [ 34.041241] [] do_exit+0x8d8/0x26b0 [ 34.046495] [] ? file_map_prot_check+0x193/0x310 [ 34.052894] [] ? release_task.part.17+0x1200/0x1200 [ 34.059536] [] ? SyS_mprotect+0x41e/0x640 [ 34.065323] [] ? up_write+0x1a/0x60 [ 34.070578] [] ? SyS_mprotect+0x423/0x640 [ 34.076351] [] do_group_exit+0x111/0x330 [ 34.082035] [] ? do_group_exit+0x330/0x330 [ 34.087895] [] SyS_exit_group+0x1d/0x20 [ 34.093492] [] do_fast_syscall_32+0x324/0x8b0 [ 34.099613] [] sysenter_flags_fixed+0xd/0x1a [ 34.105643] 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 [ 34.132351] RIP [] page_remove_rmap+0x2e/0x260 [ 34.138704] RSP [ 34.142304] CR2: ffffeafffd420008 [ 34.145729] ---[ end trace 56a4e26b38f6fa9b ]--- [ 34.150456] Kernel panic - not syncing: Fatal exception [ 34.156077] Dumping ftrace buffer: [ 34.159593] (ftrace buffer empty) [ 34.163279] Kernel Offset: disabled [ 34.166877] Rebooting in 86400 seconds..