[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.590034] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.863986] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 21.148414] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.827024] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 21.993815] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 27.605645] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 27.694881] BUG: unable to handle kernel paging request at ffffeafff8c08008 [ 27.702292] IP: [] page_remove_rmap+0x2e/0x260 [ 27.708548] PGD 0 [ 27.710792] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.715741] Dumping ftrace buffer: [ 27.719254] (ftrace buffer empty) [ 27.722941] Modules linked in: [ 27.726230] CPU: 0 PID: 3781 Comm: syz-executor342 Not tainted 4.4.150-g5541782 #83 [ 27.733995] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.743331] task: ffff8801cad69800 task.stack: ffff8801d94e0000 [ 27.749369] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 27.758079] RSP: 0018:ffff8801d94e79c0 EFLAGS: 00010246 [ 27.763504] RAX: dffffc0000000000 RBX: ffffeafff8c08000 RCX: 0000000000000000 [ 27.770769] RDX: 1ffffd5fff181001 RSI: ffffffff814bceaf RDI: ffffeafff8c08008 [ 27.778026] RBP: ffff8801d94e79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 27.785272] R10: 0000000000000001 R11: ffff8801cad69800 R12: 0000000000000001 [ 27.792519] R13: 1ffff1003b29cf3e R14: ffff8801ca055800 R15: ffffeafff8c08000 [ 27.799766] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.807968] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.813825] CR2: ffffeafff8c08008 CR3: 00000001cf607000 CR4: 00000000001606f0 [ 27.821070] Stack: [ 27.823194] ffff8801d94e7c50 0000000000000001 ffff8801d94e7a78 ffffffff8150ad13 [ 27.831214] 00003ffe302001e0 00003ffe302001e0 0000000041b58ab3 ffffffff841ef837 [ 27.839204] ffffffff8150ab10 00000000000004f0 ffff8801d236a160 ffff8801d94e7a40 [ 27.847365] Call Trace: [ 27.849946] [] zap_huge_pmd+0x203/0x510 [ 27.855556] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 27.862117] [] unmap_single_vma+0xea3/0x1240 [ 27.868156] [] ? vm_normal_page+0x280/0x280 [ 27.874106] [] ? __put_single_page+0x60/0x60 [ 27.880159] [] unmap_vmas+0x81/0xd0 [ 27.885413] [] exit_mmap+0x1c9/0x3a0 [ 27.890753] [] ? SyS_remap_file_pages+0x870/0x870 [ 27.897228] [] ? up_write+0x1a/0x60 [ 27.902482] [] mmput+0xf8/0x2d0 [ 27.907696] [] do_exit+0x8d8/0x26b0 [ 27.912973] [] ? file_map_prot_check+0x193/0x310 [ 27.919390] [] ? release_task.part.17+0x1200/0x1200 [ 27.926046] [] ? SyS_mprotect+0x41e/0x640 [ 27.931838] [] ? up_write+0x1a/0x60 [ 27.937113] [] ? SyS_mprotect+0x423/0x640 [ 27.942891] [] do_group_exit+0x111/0x330 [ 27.948581] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.955060] [] SyS_exit_group+0x1d/0x20 [ 27.960663] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 27.967227] 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 [ 27.994213] RIP [] page_remove_rmap+0x2e/0x260 [ 28.000551] RSP [ 28.004150] CR2: ffffeafff8c08008 [ 28.007579] ---[ end trace a809d30f6dee7212 ]--- [ 28.012314] Kernel panic - not syncing: Fatal exception [ 28.017993] Dumping ftrace buffer: [ 28.021518] (ftrace buffer empty) [ 28.025214] Kernel Offset: disabled [ 28.028818] Rebooting in 86400 seconds..