[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.720247] random: sshd: uninitialized urandom read (32 bytes read, 30 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.835413] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 28.177929] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 28.812007] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) [ 46.543016] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 52.230213] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 52.332896] BUG: unable to handle kernel paging request at ffffeafffd3d8008 [ 52.340250] IP: [] page_remove_rmap+0x2e/0x260 [ 52.346544] PGD 0 [ 52.348783] Oops: 0000 [#1] PREEMPT SMP KASAN [ 52.353728] Dumping ftrace buffer: [ 52.357238] (ftrace buffer empty) [ 52.360930] Modules linked in: [ 52.364212] CPU: 0 PID: 3713 Comm: syz-executor572 Not tainted 4.4.150-g5541782 #83 [ 52.371981] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.381309] task: ffff8800b2258000 task.stack: ffff8800b1d30000 [ 52.387336] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 52.396065] RSP: 0018:ffff8800b1d379c0 EFLAGS: 00010246 [ 52.401489] RAX: dffffc0000000000 RBX: ffffeafffd3d8000 RCX: 0000000000000000 [ 52.408738] RDX: 1ffffd5fffa7b001 RSI: ffffffff814bceaf RDI: ffffeafffd3d8008 [ 52.415983] RBP: ffff8800b1d379d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 52.423223] R10: 0000000000000001 R11: ffff8800b2258000 R12: 0000000000000001 [ 52.430464] R13: 1ffff100163a6f3e R14: ffff8800b4987800 R15: ffffeafffd3d8000 [ 52.437710] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 52.445911] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 52.451764] CR2: ffffeafffd3d8008 CR3: 00000000b592b000 CR4: 00000000001606f0 [ 52.459008] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.466249] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 52.473493] Stack: [ 52.475619] ffff8800b1d37c50 0000000000000001 ffff8800b1d37a78 ffffffff8150ad13 [ 52.483725] 00003fff4f6001e0 00003fff4f6001e0 0000000041b58ab3 ffffffff841ef837 [ 52.491706] ffffffff8150ab10 00000000000004f0 ffff8800b27b10b0 ffff8800b1d37a40 [ 52.499685] Call Trace: [ 52.502264] [] zap_huge_pmd+0x203/0x510 [ 52.507862] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 52.514421] [] unmap_single_vma+0xea3/0x1240 [ 52.520453] [] ? vm_normal_page+0x280/0x280 [ 52.526398] [] ? __put_single_page+0x60/0x60 [ 52.532425] [] unmap_vmas+0x81/0xd0 [ 52.537675] [] exit_mmap+0x1c9/0x3a0 [ 52.543007] [] ? SyS_remap_file_pages+0x870/0x870 [ 52.549475] [] ? up_write+0x1a/0x60 [ 52.554730] [] mmput+0xf8/0x2d0 [ 52.559632] [] do_exit+0x8d8/0x26b0 [ 52.564882] [] ? file_map_prot_check+0x193/0x310 [ 52.571265] [] ? release_task.part.17+0x1200/0x1200 [ 52.577906] [] ? SyS_mprotect+0x41e/0x640 [ 52.583677] [] ? up_write+0x1a/0x60 [ 52.588925] [] ? SyS_mprotect+0x423/0x640 [ 52.594694] [] do_group_exit+0x111/0x330 [ 52.600376] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 52.606841] [] SyS_exit_group+0x1d/0x20 [ 52.612438] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 52.618984] 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 [ 52.645770] RIP [] page_remove_rmap+0x2e/0x260 [ 52.652103] RSP [ 52.655699] CR2: ffffeafffd3d8008 [ 52.659125] ---[ end trace 27969134d24db66c ]--- [ 52.664048] Kernel panic - not syncing: Fatal exception [ 52.669748] Dumping ftrace buffer: [ 52.673258] (ftrace buffer empty) [ 52.676946] Kernel Offset: disabled [ 52.680549] Rebooting in 86400 seconds..