[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.306113] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.668320] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.978727] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.570367] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 23.732447] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. [ 29.465194] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) executing program [ 29.562474] BUG: unable to handle kernel paging request at ffffeafff8d20008 [ 29.569830] IP: [] page_remove_rmap+0x2e/0x260 [ 29.576080] PGD 0 [ 29.578342] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.583309] Dumping ftrace buffer: [ 29.586827] (ftrace buffer empty) [ 29.590549] Modules linked in: [ 29.593843] CPU: 0 PID: 3834 Comm: syz-executor671 Not tainted 4.4.150-g5541782 #19 [ 29.601610] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.610951] task: ffff8801c6d5e000 task.stack: ffff8801d9130000 [ 29.616982] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.625664] RSP: 0018:ffff8801d9137948 EFLAGS: 00010246 [ 29.631116] RAX: dffffc0000000000 RBX: ffffeafff8d20000 RCX: 0000000000000000 [ 29.638368] RDX: 1ffffd5fff1a4001 RSI: ffffffff814bceaf RDI: ffffeafff8d20008 [ 29.645613] RBP: ffff8801d9137958 R08: ffffffff85333170 R09: 0000000000000000 [ 29.652881] R10: 0000000000000001 R11: ffff8801c6d5e000 R12: 0000000000000001 [ 29.660144] R13: 1ffff1003b226f2f R14: ffff8801ce75e800 R15: ffffeafff8d20000 [ 29.667433] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.675647] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.681509] CR2: ffffeafff8d20008 CR3: 00000001cfa65000 CR4: 00000000001606f0 [ 29.688752] Stack: [ 29.690875] ffff8801d9137bd8 0000000000000001 ffff8801d9137a00 ffffffff8150ad13 [ 29.698870] 00003ffe348001e0 00003ffe348001e0 0000000041b58ab3 ffffffff841ef837 [ 29.706887] ffffffff8150ab10 00000000000004f0 ffff8801d97ebb58 ffff8801d91379c8 [ 29.714868] Call Trace: [ 29.717442] [] zap_huge_pmd+0x203/0x510 [ 29.723068] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.729643] [] unmap_single_vma+0xea3/0x1240 [ 29.735679] [] ? vm_normal_page+0x280/0x280 [ 29.741638] [] ? debug_check_no_locks_freed+0x210/0x210 [ 29.748624] [] unmap_vmas+0x81/0xd0 [ 29.753881] [] exit_mmap+0x1c9/0x3a0 [ 29.759238] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.765720] [] ? up_write+0x1a/0x60 [ 29.770992] [] mmput+0xf8/0x2d0 [ 29.775911] [] do_exit+0x8d8/0x26b0 [ 29.781162] [] ? file_map_prot_check+0x193/0x310 [ 29.787541] [] ? release_task.part.17+0x1200/0x1200 [ 29.794182] [] ? SyS_mprotect+0x41e/0x640 [ 29.799954] [] ? up_write+0x1a/0x60 [ 29.805228] [] ? SyS_mprotect+0x423/0x640 [ 29.811020] [] do_group_exit+0x111/0x330 [ 29.816703] [] ? do_group_exit+0x330/0x330 [ 29.822561] [] SyS_exit_group+0x1d/0x20 [ 29.828162] [] do_fast_syscall_32+0x324/0x8b0 [ 29.834281] [] sysenter_flags_fixed+0xd/0x1a [ 29.840495] 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 [ 29.868929] RIP [] page_remove_rmap+0x2e/0x260 [ 29.875310] RSP [ 29.878934] CR2: ffffeafff8d20008 [ 29.882359] ---[ end trace 233aea098eadff34 ]--- [ 29.887084] Kernel panic - not syncing: Fatal exception [ 29.892717] Dumping ftrace buffer: [ 29.896243] (ftrace buffer empty) [ 29.899929] Kernel Offset: disabled [ 29.903528] Rebooting in 86400 seconds..