[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.445797] 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: [ 26.495489] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.791266] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.433322] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) [ 39.114405] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.10.49' (ECDSA) to the list of known hosts. [ 44.647397] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 44.753085] BUG: unable to handle kernel paging request at ffffeafff8d38008 [ 44.760443] IP: [] page_remove_rmap+0x2e/0x260 [ 44.766690] PGD 0 [ 44.768932] Oops: 0000 [#1] PREEMPT SMP KASAN [ 44.773881] Dumping ftrace buffer: [ 44.777394] (ftrace buffer empty) [ 44.781082] Modules linked in: [ 44.784373] CPU: 1 PID: 3843 Comm: syz-executor582 Not tainted 4.4.150-g5541782 #83 [ 44.792151] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.801486] task: ffff8801d096c800 task.stack: ffff8801d8c68000 [ 44.807517] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 44.816200] RSP: 0018:ffff8801d8c6f9c0 EFLAGS: 00010246 [ 44.821661] RAX: dffffc0000000000 RBX: ffffeafff8d38000 RCX: 0000000000000000 [ 44.828909] RDX: 1ffffd5fff1a7001 RSI: ffffffff814bceaf RDI: ffffeafff8d38008 [ 44.836154] RBP: ffff8801d8c6f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 44.843396] R10: 0000000000000001 R11: ffff8801d096c800 R12: 0000000000000001 [ 44.850639] R13: 1ffff1003b18df3e R14: ffff8801d218d800 R15: ffffeafff8d38000 [ 44.857887] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 44.866090] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 44.871958] CR2: ffffeafff8d38008 CR3: 00000001d92c7000 CR4: 00000000001606f0 [ 44.879210] Stack: [ 44.881333] ffff8801d8c6fc50 0000000000000001 ffff8801d8c6fa78 ffffffff8150ad13 [ 44.889415] 00003ffe34e001e0 00003ffe34e001e0 0000000041b58ab3 ffffffff841ef837 [ 44.897408] ffffffff8150ab10 00000000000004f0 ffff8801c7c01268 ffff8801d8c6fa40 [ 44.905381] Call Trace: [ 44.907949] [] zap_huge_pmd+0x203/0x510 [ 44.913555] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 44.920113] [] unmap_single_vma+0xea3/0x1240 [ 44.926211] [] ? vm_normal_page+0x280/0x280 [ 44.932169] [] ? debug_check_no_locks_freed+0x210/0x210 [ 44.939163] [] ? debug_check_no_locks_freed+0x210/0x210 [ 44.946156] [] unmap_vmas+0x81/0xd0 [ 44.951406] [] exit_mmap+0x1c9/0x3a0 [ 44.956744] [] ? SyS_remap_file_pages+0x870/0x870 [ 44.963214] [] ? up_write+0x1a/0x60 [ 44.968537] [] mmput+0xf8/0x2d0 [ 44.973446] [] do_exit+0x8d8/0x26b0 [ 44.978704] [] ? file_map_prot_check+0x193/0x310 [ 44.985098] [] ? release_task.part.17+0x1200/0x1200 [ 44.991747] [] ? SyS_mprotect+0x41e/0x640 [ 44.997523] [] ? up_write+0x1a/0x60 [ 45.002780] [] ? SyS_mprotect+0x423/0x640 [ 45.008785] [] do_group_exit+0x111/0x330 [ 45.014581] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 45.021053] [] SyS_exit_group+0x1d/0x20 [ 45.026661] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 45.033217] 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 [ 45.060107] RIP [] page_remove_rmap+0x2e/0x260 [ 45.066580] RSP [ 45.070183] CR2: ffffeafff8d38008 [ 45.073613] ---[ end trace e0576babda2a393f ]--- [ 45.078343] Kernel panic - not syncing: Fatal exception [ 45.084076] Dumping ftrace buffer: [ 45.087603] (ftrace buffer empty) [ 45.091290] Kernel Offset: disabled [ 45.094891] Rebooting in 86400 seconds..