[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.405928] 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: [ 24.129740] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 24.437462] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.272823] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) [ 25.462905] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. [ 31.085293] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) executing program [ 31.170399] BUG: unable to handle kernel paging request at ffffeafffd3a8008 [ 31.177758] IP: [] page_remove_rmap+0x2e/0x260 [ 31.184017] PGD 0 [ 31.186259] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.191335] Dumping ftrace buffer: [ 31.194847] (ftrace buffer empty) [ 31.198533] Modules linked in: [ 31.201882] CPU: 1 PID: 3802 Comm: syz-executor771 Not tainted 4.4.150-g5541782 #83 [ 31.209646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.219264] task: ffff8801ca590000 task.stack: ffff8800bb0b8000 [ 31.225593] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.234295] RSP: 0018:ffff8800bb0bf9c0 EFLAGS: 00010246 [ 31.239864] RAX: dffffc0000000000 RBX: ffffeafffd3a8000 RCX: 0000000000000000 [ 31.247106] RDX: 1ffffd5fffa75001 RSI: ffffffff814bceaf RDI: ffffeafffd3a8008 [ 31.254351] RBP: ffff8800bb0bf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.261596] R10: 0000000000000001 R11: ffff8801ca590000 R12: 0000000000000001 [ 31.268901] R13: 1ffff10017617f3e R14: ffff8800b5541800 R15: ffffeafffd3a8000 [ 31.276150] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.284348] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.290205] CR2: ffffeafffd3a8008 CR3: 00000000aeb03000 CR4: 00000000001606f0 [ 31.297454] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.304717] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.311958] Stack: [ 31.314078] ffff8800bb0bfc50 0000000000000001 ffff8800bb0bfa78 ffffffff8150ad13 [ 31.322054] 00003fff4ea001e0 00003fff4ea001e0 0000000041b58ab3 ffffffff841ef837 [ 31.330196] ffffffff8150ab10 00000000000004f0 ffff8800af241268 ffff8800bb0bfa40 [ 31.338175] Call Trace: [ 31.340741] [] zap_huge_pmd+0x203/0x510 [ 31.346344] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.352901] [] unmap_single_vma+0xea3/0x1240 [ 31.358936] [] ? vm_normal_page+0x280/0x280 [ 31.364887] [] ? __put_single_page+0x60/0x60 [ 31.370932] [] unmap_vmas+0x81/0xd0 [ 31.376181] [] exit_mmap+0x1c9/0x3a0 [ 31.381516] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.387982] [] ? up_write+0x1a/0x60 [ 31.393233] [] mmput+0xf8/0x2d0 [ 31.398144] [] do_exit+0x8d8/0x26b0 [ 31.403398] [] ? file_map_prot_check+0x193/0x310 [ 31.409775] [] ? release_task.part.17+0x1200/0x1200 [ 31.416413] [] ? SyS_mprotect+0x41e/0x640 [ 31.422186] [] ? up_write+0x1a/0x60 [ 31.427436] [] ? SyS_mprotect+0x423/0x640 [ 31.433205] [] do_group_exit+0x111/0x330 [ 31.438986] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.445455] [] SyS_exit_group+0x1d/0x20 [ 31.451073] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.457622] 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 [ 31.484468] RIP [] page_remove_rmap+0x2e/0x260 [ 31.490816] RSP [ 31.494417] CR2: ffffeafffd3a8008 [ 31.497847] ---[ end trace 08d6b7bed1da9282 ]--- [ 31.502574] Kernel panic - not syncing: Fatal exception [ 31.508236] Dumping ftrace buffer: [ 31.511751] (ftrace buffer empty) [ 31.515432] Kernel Offset: disabled [ 31.519028] Rebooting in 86400 seconds..