[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.807083] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.326236] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available) [ 27.849770] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available) [ 28.505204] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) [ 30.486832] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 36.103189] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) executing program [ 36.195226] BUG: unable to handle kernel paging request at ffffeafffd2f8008 [ 36.202712] IP: [] page_remove_rmap+0x2e/0x260 [ 36.208994] PGD 0 [ 36.211232] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.216245] Dumping ftrace buffer: [ 36.219901] (ftrace buffer empty) [ 36.223713] Modules linked in: [ 36.227231] CPU: 1 PID: 3841 Comm: syz-executor481 Not tainted 4.4.150-g5541782 #19 [ 36.235104] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.244635] task: ffff8801d92cb000 task.stack: ffff8800bac00000 [ 36.250666] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 36.259433] RSP: 0018:ffff8800bac07948 EFLAGS: 00010246 [ 36.264879] RAX: dffffc0000000000 RBX: ffffeafffd2f8000 RCX: 0000000000000000 [ 36.272229] RDX: 1ffffd5fffa5f001 RSI: ffffffff814bceaf RDI: ffffeafffd2f8008 [ 36.279480] RBP: ffff8800bac07958 R08: ffffffff85333170 R09: 0000000000000000 [ 36.286728] R10: 0000000000000001 R11: ffff8801d92cb000 R12: 0000000000000001 [ 36.294109] R13: 1ffff10017580f2f R14: ffff8800b14f1800 R15: ffffeafffd2f8000 [ 36.301365] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.309582] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 36.315538] CR2: ffffeafffd2f8008 CR3: 00000000b059d000 CR4: 00000000001606f0 [ 36.322802] Stack: [ 36.324988] ffff8800bac07bd8 0000000000000001 ffff8800bac07a00 ffffffff8150ad13 [ 36.333013] 00003fff4be001e0 00003fff4be001e0 0000000041b58ab3 ffffffff841ef837 [ 36.341036] ffffffff8150ab10 00000000000004f0 ffff8800acc3b0b0 ffff8800bac079c8 [ 36.349035] Call Trace: [ 36.351611] [] zap_huge_pmd+0x203/0x510 [ 36.357208] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 36.363801] [] unmap_single_vma+0xea3/0x1240 [ 36.369840] [] ? vm_normal_page+0x280/0x280 [ 36.375799] [] ? __put_single_page+0x60/0x60 [ 36.381853] [] unmap_vmas+0x81/0xd0 [ 36.387222] [] exit_mmap+0x1c9/0x3a0 [ 36.392606] [] ? SyS_remap_file_pages+0x870/0x870 [ 36.399108] [] ? up_write+0x1a/0x60 [ 36.404378] [] mmput+0xf8/0x2d0 [ 36.409283] [] do_exit+0x8d8/0x26b0 [ 36.414559] [] ? file_map_prot_check+0x193/0x310 [ 36.420972] [] ? release_task.part.17+0x1200/0x1200 [ 36.427619] [] ? SyS_mprotect+0x41e/0x640 [ 36.433411] [] ? up_write+0x1a/0x60 [ 36.438665] [] ? SyS_mprotect+0x423/0x640 [ 36.444436] [] do_group_exit+0x111/0x330 [ 36.450226] [] ? do_group_exit+0x330/0x330 [ 36.456207] [] SyS_exit_group+0x1d/0x20 [ 36.461812] [] do_fast_syscall_32+0x324/0x8b0 [ 36.467935] [] sysenter_flags_fixed+0xd/0x1a [ 36.474072] 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 [ 36.501715] RIP [] page_remove_rmap+0x2e/0x260 [ 36.508039] RSP [ 36.511645] CR2: ffffeafffd2f8008 [ 36.515074] ---[ end trace 64d9e7a0d4edf69b ]--- [ 36.519800] Kernel panic - not syncing: Fatal exception [ 36.525460] Dumping ftrace buffer: [ 36.528986] (ftrace buffer empty) [ 36.532669] Kernel Offset: disabled [ 36.536269] Rebooting in 86400 seconds..