[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.093730] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.323987] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 24.685685] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.457110] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 25.646353] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. [ 31.452306] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 31.540987] BUG: unable to handle kernel paging request at ffffeafff8cb0008 [ 31.548348] IP: [] page_remove_rmap+0x2e/0x260 [ 31.554591] PGD 0 [ 31.556827] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.561799] Dumping ftrace buffer: [ 31.565309] (ftrace buffer empty) [ 31.568993] Modules linked in: [ 31.572285] CPU: 1 PID: 3817 Comm: syz-executor710 Not tainted 4.4.150-g5541782 #83 [ 31.580139] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.589475] task: ffff8800ad5bc800 task.stack: ffff8801d9598000 [ 31.595508] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.604185] RSP: 0018:ffff8801d959f9c0 EFLAGS: 00010246 [ 31.609619] RAX: dffffc0000000000 RBX: ffffeafff8cb0000 RCX: 0000000000000000 [ 31.616862] RDX: 1ffffd5fff196001 RSI: ffffffff814bceaf RDI: ffffeafff8cb0008 [ 31.624103] RBP: ffff8801d959f9d0 R08: ffffffff85333170 R09: 0000000000000000 [ 31.631354] R10: 0000000000000001 R11: ffff8800ad5bc800 R12: 0000000000000001 [ 31.638597] R13: 1ffff1003b2b3f3e R14: ffff8801d0233800 R15: ffffeafff8cb0000 [ 31.645841] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.654039] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.659892] CR2: ffffeafff8cb0008 CR3: 00000001d1881000 CR4: 00000000001606f0 [ 31.667140] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.674392] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.681638] Stack: [ 31.683758] ffff8801d959fc50 0000000000000001 ffff8801d959fa78 ffffffff8150ad13 [ 31.691736] 00003ffe32c001e0 00003ffe32c001e0 0000000041b58ab3 ffffffff841ef837 [ 31.699727] ffffffff8150ab10 00000000000004f0 ffff8801d1b2e1b8 ffff8801d959fa40 [ 31.707737] Call Trace: [ 31.710310] [] zap_huge_pmd+0x203/0x510 [ 31.715911] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.722480] [] unmap_single_vma+0xea3/0x1240 [ 31.728509] [] ? vm_normal_page+0x280/0x280 [ 31.734453] [] ? __put_single_page+0x60/0x60 [ 31.740485] [] unmap_vmas+0x81/0xd0 [ 31.745733] [] exit_mmap+0x1c9/0x3a0 [ 31.751070] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.757537] [] ? up_write+0x1a/0x60 [ 31.762794] [] mmput+0xf8/0x2d0 [ 31.767697] [] do_exit+0x8d8/0x26b0 [ 31.772950] [] ? file_map_prot_check+0x193/0x310 [ 31.779329] [] ? release_task.part.17+0x1200/0x1200 [ 31.785987] [] ? SyS_mprotect+0x41e/0x640 [ 31.791761] [] ? up_write+0x1a/0x60 [ 31.797012] [] ? SyS_mprotect+0x423/0x640 [ 31.802783] [] do_group_exit+0x111/0x330 [ 31.808468] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.814936] [] SyS_exit_group+0x1d/0x20 [ 31.820534] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.827080] 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 [ 31.853947] RIP [] page_remove_rmap+0x2e/0x260 [ 31.860286] RSP [ 31.863891] CR2: ffffeafff8cb0008 [ 31.867314] ---[ end trace f6c51d36a1105035 ]--- [ 31.872043] Kernel panic - not syncing: Fatal exception [ 31.877708] Dumping ftrace buffer: [ 31.881226] (ftrace buffer empty) [ 31.884908] Kernel Offset: disabled [ 31.888505] Rebooting in 86400 seconds..