[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.246664] 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: [ 23.665412] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.139434] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.905009] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) [ 25.064469] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. [ 30.581168] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) executing program [ 30.664405] BUG: unable to handle kernel paging request at ffffeafffd308008 [ 30.671765] IP: [] page_remove_rmap+0x2e/0x260 [ 30.678023] PGD 0 [ 30.680263] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.685206] Dumping ftrace buffer: [ 30.688720] (ftrace buffer empty) [ 30.692408] Modules linked in: [ 30.695698] CPU: 0 PID: 3801 Comm: syz-executor937 Not tainted 4.4.150-g5541782 #83 [ 30.703472] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.713287] task: ffff8800af361800 task.stack: ffff8800bb098000 [ 30.719319] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 30.727995] RSP: 0018:ffff8800bb09f9c0 EFLAGS: 00010246 [ 30.733424] RAX: dffffc0000000000 RBX: ffffeafffd308000 RCX: 0000000000000000 [ 30.740692] RDX: 1ffffd5fffa61001 RSI: ffffffff814bceaf RDI: ffffeafffd308008 [ 30.747941] RBP: ffff8800bb09f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 30.755189] R10: 0000000000000001 R11: ffff8800af361800 R12: 0000000000000001 [ 30.762436] R13: 1ffff10017613f3e R14: ffff8800b44d4800 R15: ffffeafffd308000 [ 30.769689] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.777888] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.783749] CR2: ffffeafffd308008 CR3: 00000000b5b0e000 CR4: 00000000001606f0 [ 30.791007] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.798254] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.805496] Stack: [ 30.807620] ffff8800bb09fc50 0000000000000001 ffff8800bb09fa78 ffffffff8150ad13 [ 30.815615] 00003fff4c2001e0 00003fff4c2001e0 0000000041b58ab3 ffffffff841ef837 [ 30.823605] ffffffff8150ab10 00000000000004f0 ffff8800b2ab4580 ffff8800bb09fa40 [ 30.831606] Call Trace: [ 30.834172] [] zap_huge_pmd+0x203/0x510 [ 30.839772] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.846323] [] unmap_single_vma+0xea3/0x1240 [ 30.852354] [] ? vm_normal_page+0x280/0x280 [ 30.858305] [] ? __put_single_page+0x60/0x60 [ 30.864342] [] unmap_vmas+0x81/0xd0 [ 30.869599] [] exit_mmap+0x1c9/0x3a0 [ 30.874947] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.881418] [] ? up_write+0x1a/0x60 [ 30.886677] [] mmput+0xf8/0x2d0 [ 30.891578] [] do_exit+0x8d8/0x26b0 [ 30.896835] [] ? file_map_prot_check+0x193/0x310 [ 30.903214] [] ? release_task.part.17+0x1200/0x1200 [ 30.909863] [] ? SyS_mprotect+0x41e/0x640 [ 30.915642] [] ? up_write+0x1a/0x60 [ 30.920899] [] ? SyS_mprotect+0x423/0x640 [ 30.926678] [] do_group_exit+0x111/0x330 [ 30.932366] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.938831] [] SyS_exit_group+0x1d/0x20 [ 30.944437] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 30.950989] 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 [ 30.977826] RIP [] page_remove_rmap+0x2e/0x260 [ 30.984156] RSP [ 30.987763] CR2: ffffeafffd308008 [ 30.991190] ---[ end trace de2cf751a7e1b0a4 ]--- [ 30.995914] Kernel panic - not syncing: Fatal exception [ 31.001756] Dumping ftrace buffer: [ 31.005270] (ftrace buffer empty) [ 31.008951] Kernel Offset: disabled [ 31.012551] Rebooting in 86400 seconds..