[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.272372] 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: [ 23.186463] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.523339] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.161918] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 24.321223] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 29.837415] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 29.923865] BUG: unable to handle kernel paging request at ffffeafffd460008 [ 29.931205] IP: [] page_remove_rmap+0x2e/0x260 [ 29.944500] PGD 0 [ 29.946769] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.951845] Dumping ftrace buffer: [ 29.955362] (ftrace buffer empty) [ 29.959049] Modules linked in: [ 29.962334] CPU: 0 PID: 3786 Comm: syz-executor010 Not tainted 4.4.149-gf76bdbd #18 [ 29.970168] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.979507] task: ffff8800af3b0000 task.stack: ffff8800af230000 [ 29.985636] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.994408] RSP: 0018:ffff8800af237948 EFLAGS: 00010246 [ 29.999833] RAX: dffffc0000000000 RBX: ffffeafffd460000 RCX: 0000000000000000 [ 30.007184] RDX: 1ffffd5fffa8c001 RSI: ffffffff814bc8bf RDI: ffffeafffd460008 [ 30.014432] RBP: ffff8800af237958 R08: ffffffff85302320 R09: 0000000000000000 [ 30.021678] R10: 0000000000000001 R11: ffff8800af3b0000 R12: 0000000000000001 [ 30.028926] R13: 1ffff10015e46f2f R14: ffff8800b5fc8800 R15: ffffeafffd460000 [ 30.036232] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.044440] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.050438] CR2: ffffeafffd460008 CR3: 00000000b22a0000 CR4: 00000000001606f0 [ 30.057692] Stack: [ 30.059828] ffff8800af237bd8 0000000000000001 ffff8800af237a00 ffffffff8150a443 [ 30.067835] 00003fff518001e0 00003fff518001e0 0000000041b58ab3 ffffffff841ef837 [ 30.075918] ffffffff8150a240 00000000000004f0 ffff8800b48376e0 ffff8800af2379c8 [ 30.084002] Call Trace: [ 30.086568] [] zap_huge_pmd+0x203/0x510 [ 30.092173] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.098772] [] unmap_single_vma+0xea3/0x1240 [ 30.104902] [] ? vm_normal_page+0x230/0x230 [ 30.111019] [] ? __put_single_page+0x60/0x60 [ 30.117052] [] unmap_vmas+0x81/0xd0 [ 30.122307] [] exit_mmap+0x1c9/0x3a0 [ 30.127654] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.134127] [] ? up_write+0x1a/0x60 [ 30.139437] [] mmput+0xf8/0x2d0 [ 30.144404] [] do_exit+0x8d8/0x26b0 [ 30.149667] [] ? file_map_prot_check+0x193/0x310 [ 30.156055] [] ? release_task.part.17+0x1200/0x1200 [ 30.162697] [] ? SyS_mprotect+0x41e/0x640 [ 30.168471] [] ? up_write+0x1a/0x60 [ 30.173723] [] ? SyS_mprotect+0x423/0x640 [ 30.179606] [] do_group_exit+0x111/0x330 [ 30.185292] [] ? do_group_exit+0x330/0x330 [ 30.191245] [] SyS_exit_group+0x1d/0x20 [ 30.196882] [] do_fast_syscall_32+0x324/0x8b0 [ 30.203007] [] sysenter_flags_fixed+0xd/0x1a [ 30.209043] 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 [ 30.236608] RIP [] page_remove_rmap+0x2e/0x260 [ 30.242937] RSP [ 30.246539] CR2: ffffeafffd460008 [ 30.249965] ---[ end trace a31ade3fd6d0e01b ]--- [ 30.254748] Kernel panic - not syncing: Fatal exception [ 30.260461] Dumping ftrace buffer: [ 30.263985] (ftrace buffer empty) [ 30.267711] Kernel Offset: disabled [ 30.271362] Rebooting in 86400 seconds..