[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.767444] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.569032] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.765360] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.523735] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 23.707823] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. [ 29.226439] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 29.314514] BUG: unable to handle kernel paging request at ffffeafff8ce8008 [ 29.321878] IP: [] page_remove_rmap+0x2e/0x260 [ 29.328142] PGD 0 [ 29.330397] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.335376] Dumping ftrace buffer: [ 29.338901] (ftrace buffer empty) [ 29.342586] Modules linked in: [ 29.345872] CPU: 1 PID: 3827 Comm: syz-executor364 Not tainted 4.4.150-g5541782 #83 [ 29.353652] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.362981] task: ffff8801d2e00000 task.stack: ffff8801d3530000 [ 29.369012] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.377689] RSP: 0018:ffff8801d35379c0 EFLAGS: 00010246 [ 29.383117] RAX: dffffc0000000000 RBX: ffffeafff8ce8000 RCX: 0000000000000000 [ 29.390360] RDX: 1ffffd5fff19d001 RSI: ffffffff814bceaf RDI: ffffeafff8ce8008 [ 29.397618] RBP: ffff8801d35379d0 R08: ffffffff85333170 R09: 0000000000000000 [ 29.404863] R10: 0000000000000001 R11: ffff8801d2e00000 R12: 0000000000000001 [ 29.412125] R13: 1ffff1003a6a6f3e R14: ffff8801cdd24800 R15: ffffeafff8ce8000 [ 29.419372] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.427572] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.433427] CR2: ffffeafff8ce8008 CR3: 00000001cf264000 CR4: 00000000001606f0 [ 29.440675] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.447939] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.455180] Stack: [ 29.457303] ffff8801d3537c50 0000000000000001 ffff8801d3537a78 ffffffff8150ad13 [ 29.465362] 00003ffe33a001e0 00003ffe33a001e0 0000000041b58ab3 ffffffff841ef837 [ 29.473375] ffffffff8150ab10 00000000000004f0 ffff8801ccca89a0 ffff8801d3537a40 [ 29.481389] Call Trace: [ 29.484018] [] zap_huge_pmd+0x203/0x510 [ 29.489629] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.496184] [] unmap_single_vma+0xea3/0x1240 [ 29.502219] [] ? vm_normal_page+0x280/0x280 [ 29.508182] [] ? __put_single_page+0x60/0x60 [ 29.514230] [] unmap_vmas+0x81/0xd0 [ 29.519482] [] exit_mmap+0x1c9/0x3a0 [ 29.524819] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.531286] [] ? up_write+0x1a/0x60 [ 29.536542] [] mmput+0xf8/0x2d0 [ 29.541447] [] do_exit+0x8d8/0x26b0 [ 29.546727] [] ? file_map_prot_check+0x193/0x310 [ 29.553109] [] ? release_task.part.17+0x1200/0x1200 [ 29.559751] [] ? SyS_mprotect+0x41e/0x640 [ 29.565524] [] ? up_write+0x1a/0x60 [ 29.570775] [] ? SyS_mprotect+0x423/0x640 [ 29.576549] [] do_group_exit+0x111/0x330 [ 29.582236] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.588702] [] SyS_exit_group+0x1d/0x20 [ 29.594304] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.601133] 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 [ 29.628119] RIP [] page_remove_rmap+0x2e/0x260 [ 29.634445] RSP [ 29.638065] CR2: ffffeafff8ce8008 [ 29.641499] ---[ end trace 6cca5f5bce169b47 ]--- [ 29.646238] Kernel panic - not syncing: Fatal exception [ 29.652019] Dumping ftrace buffer: [ 29.655541] (ftrace buffer empty) [ 29.659224] Kernel Offset: disabled [ 29.662823] Rebooting in 86400 seconds..