[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.184472] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.329602] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 24.714847] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.392261] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 32.938502] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. [ 38.496388] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 38.587410] BUG: unable to handle kernel paging request at ffffeafffd4e8008 [ 38.594868] IP: [] page_remove_rmap+0x2e/0x260 [ 38.601126] PGD 0 [ 38.603370] Oops: 0000 [#1] PREEMPT SMP KASAN [ 38.608390] Dumping ftrace buffer: [ 38.611916] (ftrace buffer empty) [ 38.615630] Modules linked in: [ 38.618966] CPU: 0 PID: 3842 Comm: syz-executor262 Not tainted 4.4.150-g5541782 #19 [ 38.626734] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.636065] task: ffff8801d9501800 task.stack: ffff8800bb900000 [ 38.642107] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 38.650995] RSP: 0018:ffff8800bb907948 EFLAGS: 00010246 [ 38.656417] RAX: dffffc0000000000 RBX: ffffeafffd4e8000 RCX: ffffea00071d0000 [ 38.663665] RDX: 1ffffd5fffa9d001 RSI: ffffffff814bceaf RDI: ffffeafffd4e8008 [ 38.670911] RBP: ffff8800bb907958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 38.678162] R10: 0000000000000001 R11: ffff8801d9501800 R12: 0000000000000001 [ 38.685413] R13: 1ffff10017720f2f R14: ffff8800b44c5800 R15: ffffeafffd4e8000 [ 38.692658] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 38.700860] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 38.706715] CR2: ffffeafffd4e8008 CR3: 00000000bb543000 CR4: 00000000001606f0 [ 38.714073] Stack: [ 38.716194] ffff8800bb907bd8 0000000000000001 ffff8800bb907a00 ffffffff8150ad13 [ 38.724173] 00003fff53a001e0 00003fff53a001e0 0000000041b58ab3 ffffffff841ef837 [ 38.732151] ffffffff8150ab10 00000000000004f0 ffff8800b1b4d9f8 ffff8800bb9079c8 [ 38.740134] Call Trace: [ 38.742704] [] zap_huge_pmd+0x203/0x510 [ 38.748310] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 38.754864] [] unmap_single_vma+0xea3/0x1240 [ 38.760905] [] ? vm_normal_page+0x280/0x280 [ 38.766854] [] ? __put_single_page+0x60/0x60 [ 38.772893] [] unmap_vmas+0x81/0xd0 [ 38.778143] [] exit_mmap+0x1c9/0x3a0 [ 38.783535] [] ? SyS_remap_file_pages+0x870/0x870 [ 38.790013] [] ? up_write+0x1a/0x60 [ 38.795271] [] mmput+0xf8/0x2d0 [ 38.800191] [] do_exit+0x8d8/0x26b0 [ 38.805455] [] ? file_map_prot_check+0x193/0x310 [ 38.811836] [] ? release_task.part.17+0x1200/0x1200 [ 38.818479] [] ? SyS_mprotect+0x41e/0x640 [ 38.824266] [] ? up_write+0x1a/0x60 [ 38.829529] [] ? SyS_mprotect+0x423/0x640 [ 38.835300] [] do_group_exit+0x111/0x330 [ 38.840983] [] ? do_group_exit+0x330/0x330 [ 38.846839] [] SyS_exit_group+0x1d/0x20 [ 38.852436] [] do_fast_syscall_32+0x324/0x8b0 [ 38.858556] [] sysenter_flags_fixed+0xd/0x1a [ 38.864587] 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 [ 38.891440] RIP [] page_remove_rmap+0x2e/0x260 [ 38.897769] RSP [ 38.901366] CR2: ffffeafffd4e8008 [ 38.904794] ---[ end trace 67ac03f81cbab838 ]--- [ 38.909702] Kernel panic - not syncing: Fatal exception [ 38.915347] Dumping ftrace buffer: [ 38.918865] (ftrace buffer empty) [ 38.922546] Kernel Offset: disabled [ 38.926153] Rebooting in 86400 seconds..