[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.006334] 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: [ 23.564607] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.888169] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.622044] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 24.810847] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. [ 30.361339] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 30.448284] BUG: unable to handle kernel paging request at ffffeafff8c50008 [ 30.455655] IP: [] page_remove_rmap+0x2e/0x260 [ 30.461941] PGD 0 [ 30.464186] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.469173] Dumping ftrace buffer: [ 30.472688] (ftrace buffer empty) [ 30.476379] Modules linked in: [ 30.479674] CPU: 1 PID: 3790 Comm: syz-executor887 Not tainted 4.4.150-g5541782 #83 [ 30.487468] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.496815] task: ffff8801ca566000 task.stack: ffff8801c9c80000 [ 30.502852] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 30.511543] RSP: 0018:ffff8801c9c879c0 EFLAGS: 00010246 [ 30.516976] RAX: dffffc0000000000 RBX: ffffeafff8c50000 RCX: 0000000000000000 [ 30.524232] RDX: 1ffffd5fff18a001 RSI: ffffffff814bceaf RDI: ffffeafff8c50008 [ 30.531497] RBP: ffff8801c9c879d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 30.538755] R10: 0000000000000001 R11: ffff8801ca566000 R12: 0000000000000001 [ 30.546007] R13: 1ffff10039390f3e R14: ffff8801d0229800 R15: ffffeafff8c50000 [ 30.553260] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.561465] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.567323] CR2: ffffeafff8c50008 CR3: 00000001d036b000 CR4: 00000000001606f0 [ 30.574595] Stack: [ 30.576722] ffff8801c9c87c50 0000000000000001 ffff8801c9c87a78 ffffffff8150ad13 [ 30.584762] 00003ffe314001e0 00003ffe314001e0 0000000041b58ab3 ffffffff841ef837 [ 30.592758] ffffffff8150ab10 00000000000004f0 ffff8801cf49d738 ffff8801c9c87a40 [ 30.600992] Call Trace: [ 30.603566] [] zap_huge_pmd+0x203/0x510 [ 30.609170] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.615727] [] unmap_single_vma+0xea3/0x1240 [ 30.621768] [] ? vm_normal_page+0x280/0x280 [ 30.627717] [] ? __put_single_page+0x60/0x60 [ 30.633755] [] unmap_vmas+0x81/0xd0 [ 30.639016] [] exit_mmap+0x1c9/0x3a0 [ 30.644356] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.650824] [] ? up_write+0x1a/0x60 [ 30.656076] [] mmput+0xf8/0x2d0 [ 30.660980] [] do_exit+0x8d8/0x26b0 [ 30.666237] [] ? file_map_prot_check+0x193/0x310 [ 30.672621] [] ? release_task.part.17+0x1200/0x1200 [ 30.679269] [] ? SyS_mprotect+0x41e/0x640 [ 30.685043] [] ? up_write+0x1a/0x60 [ 30.690297] [] ? SyS_mprotect+0x423/0x640 [ 30.696071] [] do_group_exit+0x111/0x330 [ 30.701765] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.708235] [] SyS_exit_group+0x1d/0x20 [ 30.713842] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 30.720393] 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 [ 30.747411] RIP [] page_remove_rmap+0x2e/0x260 [ 30.753740] RSP [ 30.757349] CR2: ffffeafff8c50008 [ 30.760779] ---[ end trace e56fb1fc17725ee9 ]--- [ 30.765507] Kernel panic - not syncing: Fatal exception [ 30.771179] Dumping ftrace buffer: [ 30.774700] (ftrace buffer empty) [ 30.778385] Kernel Offset: disabled [ 30.781987] Rebooting in 86400 seconds..