[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.437074] 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: [ 25.734045] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.245774] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.913897] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 27.077940] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 32.648087] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 32.734543] BUG: unable to handle kernel paging request at ffffeafff8d18008 [ 32.741874] IP: [] page_remove_rmap+0x2e/0x260 [ 32.748113] PGD 0 [ 32.750354] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.755296] Dumping ftrace buffer: [ 32.758806] (ftrace buffer empty) [ 32.762490] Modules linked in: [ 32.765771] CPU: 1 PID: 3833 Comm: syz-executor144 Not tainted 4.4.150-g5541782 #83 [ 32.773538] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.782878] task: ffff8800bb8ae000 task.stack: ffff8801d9608000 [ 32.788905] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.797576] RSP: 0018:ffff8801d960f9c0 EFLAGS: 00010246 [ 32.802998] RAX: dffffc0000000000 RBX: ffffeafff8d18000 RCX: 0000000000000000 [ 32.810239] RDX: 1ffffd5fff1a3001 RSI: ffffffff814bceaf RDI: ffffeafff8d18008 [ 32.817480] RBP: ffff8801d960f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.824724] R10: 0000000000000001 R11: ffff8800bb8ae000 R12: 0000000000000001 [ 32.831966] R13: 1ffff1003b2c1f3e R14: ffff8801d1970800 R15: ffffeafff8d18000 [ 32.839211] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.847409] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.853289] CR2: ffffeafff8d18008 CR3: 00000001cd34b000 CR4: 00000000001606f0 [ 32.860531] Stack: [ 32.862661] ffff8801d960fc50 0000000000000001 ffff8801d960fa78 ffffffff8150ad13 [ 32.870640] 00003ffe346001e0 00003ffe346001e0 0000000041b58ab3 ffffffff841ef837 [ 32.878627] ffffffff8150ab10 00000000000004f0 ffff8801d19279a0 ffff8801d960fa40 [ 32.886631] Call Trace: [ 32.889197] [] zap_huge_pmd+0x203/0x510 [ 32.894816] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.901370] [] unmap_single_vma+0xea3/0x1240 [ 32.907399] [] ? vm_normal_page+0x280/0x280 [ 32.913351] [] ? __put_single_page+0x60/0x60 [ 32.919378] [] unmap_vmas+0x81/0xd0 [ 32.924625] [] exit_mmap+0x1c9/0x3a0 [ 32.929971] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.936436] [] ? up_write+0x1a/0x60 [ 32.941691] [] mmput+0xf8/0x2d0 [ 32.946593] [] do_exit+0x8d8/0x26b0 [ 32.951843] [] ? file_map_prot_check+0x193/0x310 [ 32.958218] [] ? release_task.part.17+0x1200/0x1200 [ 32.964858] [] ? SyS_mprotect+0x41e/0x640 [ 32.970627] [] ? up_write+0x1a/0x60 [ 32.975894] [] ? SyS_mprotect+0x423/0x640 [ 32.981673] [] do_group_exit+0x111/0x330 [ 32.987356] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.993823] [] SyS_exit_group+0x1d/0x20 [ 32.999424] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.005972] 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 [ 33.032778] RIP [] page_remove_rmap+0x2e/0x260 [ 33.039117] RSP [ 33.042713] CR2: ffffeafff8d18008 [ 33.046153] ---[ end trace 83984ec0419ca6c5 ]--- [ 33.050878] Kernel panic - not syncing: Fatal exception [ 33.056536] Dumping ftrace buffer: [ 33.060057] (ftrace buffer empty) [ 33.063743] Kernel Offset: disabled [ 33.067337] Rebooting in 86400 seconds..