[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.816008] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.104316] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.498370] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.110809] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) [ 27.285359] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 32.785576] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) executing program [ 32.879079] BUG: unable to handle kernel paging request at ffffeafff8b80008 [ 32.886435] IP: [] page_remove_rmap+0x2e/0x260 [ 32.892681] PGD 0 [ 32.894921] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.899874] Dumping ftrace buffer: [ 32.903386] (ftrace buffer empty) [ 32.907073] Modules linked in: [ 32.910365] CPU: 1 PID: 3828 Comm: syz-executor275 Not tainted 4.4.150-g5541782 #83 [ 32.918167] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.927498] task: ffff8801d9110000 task.stack: ffff8801d91d0000 [ 32.933528] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.942225] RSP: 0018:ffff8801d91d79c0 EFLAGS: 00010246 [ 32.947654] RAX: dffffc0000000000 RBX: ffffeafff8b80000 RCX: 0000000000000000 [ 32.954901] RDX: 1ffffd5fff170001 RSI: ffffffff814bceaf RDI: ffffeafff8b80008 [ 32.962147] RBP: ffff8801d91d79d0 R08: ffffffff85333170 R09: 0000000000000000 [ 32.969433] R10: 0000000000000001 R11: ffff8801d9110000 R12: 0000000000000001 [ 32.976681] R13: 1ffff1003b23af3e R14: ffff8801d223a800 R15: ffffeafff8b80000 [ 32.983931] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.992139] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.998000] CR2: ffffeafff8b80008 CR3: 00000001d9aee000 CR4: 00000000001606f0 [ 33.005247] Stack: [ 33.007374] ffff8801d91d7c50 0000000000000001 ffff8801d91d7a78 ffffffff8150ad13 [ 33.015404] 00003ffe2e0001e0 00003ffe2e0001e0 0000000041b58ab3 ffffffff841ef837 [ 33.023441] ffffffff8150ab10 00000000000004f0 ffff8801d940f4d0 ffff8801d91d7a40 [ 33.031438] Call Trace: [ 33.034001] [] zap_huge_pmd+0x203/0x510 [ 33.039786] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.046361] [] unmap_single_vma+0xea3/0x1240 [ 33.052397] [] ? vm_normal_page+0x280/0x280 [ 33.058342] [] ? __put_single_page+0x60/0x60 [ 33.064373] [] unmap_vmas+0x81/0xd0 [ 33.069627] [] exit_mmap+0x1c9/0x3a0 [ 33.074975] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.081445] [] ? up_write+0x1a/0x60 [ 33.086697] [] mmput+0xf8/0x2d0 [ 33.091602] [] do_exit+0x8d8/0x26b0 [ 33.096898] [] ? file_map_prot_check+0x193/0x310 [ 33.103280] [] ? release_task.part.17+0x1200/0x1200 [ 33.109923] [] ? SyS_mprotect+0x41e/0x640 [ 33.115696] [] ? up_write+0x1a/0x60 [ 33.120947] [] ? SyS_mprotect+0x423/0x640 [ 33.126725] [] do_group_exit+0x111/0x330 [ 33.132423] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.138893] [] SyS_exit_group+0x1d/0x20 [ 33.144512] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.151065] 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 [ 33.178121] RIP [] page_remove_rmap+0x2e/0x260 [ 33.184452] RSP [ 33.188049] CR2: ffffeafff8b80008 [ 33.191475] ---[ end trace 6b455d5233a61f3a ]--- [ 33.196212] Kernel panic - not syncing: Fatal exception [ 33.201840] Dumping ftrace buffer: [ 33.205366] (ftrace buffer empty) [ 33.209052] Kernel Offset: disabled [ 33.212652] Rebooting in 86400 seconds..