[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.003482] 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: [ 21.587577] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.877829] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.604656] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 22.788530] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. [ 28.445308] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 28.533203] BUG: unable to handle kernel paging request at ffffeafff8cc0008 [ 28.540575] IP: [] page_remove_rmap+0x2e/0x260 [ 28.546822] PGD 0 [ 28.549063] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.554041] Dumping ftrace buffer: [ 28.557557] (ftrace buffer empty) [ 28.561238] Modules linked in: [ 28.564524] CPU: 0 PID: 3771 Comm: syz-executor347 Not tainted 4.4.150-g5541782 #83 [ 28.572300] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.581634] task: ffff8801cb48b000 task.stack: ffff8801d9b68000 [ 28.587665] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.596367] RSP: 0018:ffff8801d9b6f9c0 EFLAGS: 00010246 [ 28.601793] RAX: dffffc0000000000 RBX: ffffeafff8cc0000 RCX: 0000000000000000 [ 28.609041] RDX: 1ffffd5fff198001 RSI: ffffffff814bceaf RDI: ffffeafff8cc0008 [ 28.616301] RBP: ffff8801d9b6f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.623543] R10: 0000000000000001 R11: ffff8801cb48b000 R12: 0000000000000001 [ 28.630790] R13: 1ffff1003b36df3e R14: ffff8801d183d800 R15: ffffeafff8cc0000 [ 28.638044] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.646251] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.652107] CR2: ffffeafff8cc0008 CR3: 00000001d0f85000 CR4: 00000000001606f0 [ 28.659354] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.666598] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.673838] Stack: [ 28.675971] ffff8801d9b6fc50 0000000000000001 ffff8801d9b6fa78 ffffffff8150ad13 [ 28.683964] 00003ffe330001e0 00003ffe330001e0 0000000041b58ab3 ffffffff841ef837 [ 28.691957] ffffffff8150ab10 00000000000004f0 ffff8801d219d8f0 ffff8801d9b6fa40 [ 28.699963] Call Trace: [ 28.702530] [] zap_huge_pmd+0x203/0x510 [ 28.708130] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.714682] [] unmap_single_vma+0xea3/0x1240 [ 28.720713] [] ? vm_normal_page+0x280/0x280 [ 28.726659] [] ? __put_single_page+0x60/0x60 [ 28.732693] [] unmap_vmas+0x81/0xd0 [ 28.737953] [] exit_mmap+0x1c9/0x3a0 [ 28.743294] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.749769] [] ? up_write+0x1a/0x60 [ 28.755026] [] mmput+0xf8/0x2d0 [ 28.759935] [] do_exit+0x8d8/0x26b0 [ 28.765195] [] ? file_map_prot_check+0x193/0x310 [ 28.771582] [] ? release_task.part.17+0x1200/0x1200 [ 28.778226] [] ? SyS_mprotect+0x41e/0x640 [ 28.784009] [] ? up_write+0x1a/0x60 [ 28.789260] [] ? SyS_mprotect+0x423/0x640 [ 28.795032] [] do_group_exit+0x111/0x330 [ 28.800714] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.807178] [] SyS_exit_group+0x1d/0x20 [ 28.812777] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.819323] 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 [ 28.846171] RIP [] page_remove_rmap+0x2e/0x260 [ 28.852508] RSP [ 28.856108] CR2: ffffeafff8cc0008 [ 28.859536] ---[ end trace b979917cc449024f ]--- [ 28.864264] Kernel panic - not syncing: Fatal exception [ 28.869973] Dumping ftrace buffer: [ 28.873498] (ftrace buffer empty) [ 28.877180] Kernel Offset: disabled [ 28.880780] Rebooting in 86400 seconds..