[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.002510] 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: [ 22.432779] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.649939] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 23.295078] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 29.407270] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts. [ 35.086124] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 35.180369] BUG: unable to handle kernel paging request at ffffeafff8e00008 [ 35.187856] IP: [] page_remove_rmap+0x2e/0x260 [ 35.194245] PGD 0 [ 35.196496] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.201480] Dumping ftrace buffer: [ 35.204992] (ftrace buffer empty) [ 35.208679] Modules linked in: [ 35.212050] CPU: 1 PID: 3828 Comm: syz-executor534 Not tainted 4.4.150-g5541782 #19 [ 35.219918] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.229248] task: ffff8800bb97b000 task.stack: ffff8801c8bd0000 [ 35.235280] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.243961] RSP: 0018:ffff8801c8bd7948 EFLAGS: 00010246 [ 35.249391] RAX: dffffc0000000000 RBX: ffffeafff8e00000 RCX: 0000000000000000 [ 35.256642] RDX: 1ffffd5fff1c0001 RSI: ffffffff814bceaf RDI: ffffeafff8e00008 [ 35.264059] RBP: ffff8801c8bd7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 35.271317] R10: 0000000000000001 R11: ffff8800bb97b000 R12: 0000000000000001 [ 35.278568] R13: 1ffff1003917af2f R14: ffff8801d21cd800 R15: ffffeafff8e00000 [ 35.285816] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.294064] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 35.300048] CR2: ffffeafff8e00008 CR3: 00000001d2225000 CR4: 00000000001606f0 [ 35.307301] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.314551] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.321794] Stack: [ 35.323917] ffff8801c8bd7bd8 0000000000000001 ffff8801c8bd7a00 ffffffff8150ad13 [ 35.332221] 00003ffe380001e0 00003ffe380001e0 0000000041b58ab3 ffffffff841ef837 [ 35.340208] ffffffff8150ab10 00000000000004f0 ffff8801d2089c60 ffff8801c8bd79c8 [ 35.348192] Call Trace: [ 35.350756] [] zap_huge_pmd+0x203/0x510 [ 35.356360] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.362915] [] unmap_single_vma+0xea3/0x1240 [ 35.368954] [] ? vm_normal_page+0x280/0x280 [ 35.374901] [] ? __put_single_page+0x60/0x60 [ 35.380944] [] unmap_vmas+0x81/0xd0 [ 35.386266] [] exit_mmap+0x1c9/0x3a0 [ 35.391611] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.398094] [] ? up_write+0x1a/0x60 [ 35.403598] [] mmput+0xf8/0x2d0 [ 35.408511] [] do_exit+0x8d8/0x26b0 [ 35.413775] [] ? file_map_prot_check+0x193/0x310 [ 35.420156] [] ? release_task.part.17+0x1200/0x1200 [ 35.426812] [] ? SyS_mprotect+0x41e/0x640 [ 35.432813] [] ? up_write+0x1a/0x60 [ 35.438066] [] ? SyS_mprotect+0x423/0x640 [ 35.443836] [] do_group_exit+0x111/0x330 [ 35.449580] [] ? do_group_exit+0x330/0x330 [ 35.455445] [] SyS_exit_group+0x1d/0x20 [ 35.461143] [] do_fast_syscall_32+0x324/0x8b0 [ 35.467271] [] sysenter_flags_fixed+0xd/0x1a [ 35.473300] 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 [ 35.500642] RIP [] page_remove_rmap+0x2e/0x260 [ 35.507081] RSP [ 35.510681] CR2: ffffeafff8e00008 [ 35.514109] ---[ end trace cc338082d13ba937 ]--- [ 35.518920] Kernel panic - not syncing: Fatal exception [ 35.524955] Dumping ftrace buffer: [ 35.528473] (ftrace buffer empty) [ 35.532159] Kernel Offset: disabled [ 35.535757] Rebooting in 86400 seconds..