[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.071245] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.589985] random: sshd: uninitialized urandom read (32 bytes read) [ 18.828333] random: sshd: uninitialized urandom read (32 bytes read) [ 19.339701] random: sshd: uninitialized urandom read (32 bytes read) [ 22.076971] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. [ 27.574760] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.651904] BUG: unable to handle kernel paging request at ffffeafff8ec8020 [ 27.659373] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.665623] PGD 0 [ 27.667571] [ 27.669197] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.673710] Dumping ftrace buffer: [ 27.677228] (ftrace buffer empty) [ 27.680921] Modules linked in: [ 27.684215] CPU: 0 PID: 3798 Comm: syz-executor758 Not tainted 4.9.122-g54068d6 #26 [ 27.691982] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.701311] task: ffff8801b7de1800 task.stack: ffff8801d95f8000 [ 27.707342] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.716022] RSP: 0018:ffff8801d95ff948 EFLAGS: 00010246 [ 27.721458] RAX: dffffc0000000000 RBX: ffffeafff8ec8000 RCX: 0000000000000000 [ 27.728817] RDX: 1ffffd5fff1d9004 RSI: ffffffff814f5918 RDI: ffffeafff8ec8000 [ 27.736066] RBP: ffff8801d95ff970 R08: 0000000000033e20 R09: 0000000000000001 [ 27.743515] R10: ffff8801b7de1800 R11: 0000000000000001 R12: ffff8801d95ffc08 [ 27.750776] R13: ffffeafff8ec8020 R14: ffffeafff8ec8000 R15: 0000000000000001 [ 27.758040] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.766247] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.772111] CR2: ffffeafff8ec8020 CR3: 00000001ca6af000 CR4: 00000000001606f0 [ 27.779406] Stack: [ 27.781580] ffffeafff8ec8020 ffff8801d95ffc08 ffff8801caf5d800 ffffeafff8ec8000 [ 27.789708] ffff8801c7ff0688 ffff8801d95ff9c8 ffffffff8154cb8f ffff8801d95ffc18 [ 27.797728] ffff8801d95ffc10 ffff8801d95ffc88 00003ffe3b2001e0 00000001caf5d000 [ 27.805727] Call Trace: [ 27.808299] [] zap_huge_pmd+0x16f/0x860 [ 27.814008] [] unmap_page_range+0x12ad/0x1730 [ 27.820144] [] ? vm_normal_page_pmd+0x310/0x310 [ 27.826452] [] unmap_single_vma+0x101/0x260 [ 27.832405] [] unmap_vmas+0x102/0x1d0 [ 27.837837] [] exit_mmap+0x214/0x3f0 [ 27.843184] [] ? SyS_munmap+0xa0/0xa0 [ 27.848614] [] mmput+0xf3/0x2d0 [ 27.853525] [] do_exit+0x906/0x27b0 [ 27.858787] [] ? release_task.part.19+0x1210/0x1210 [ 27.865586] [] ? up_write+0x1a/0x60 [ 27.870851] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.876972] [] ? mprotect_fixup+0x930/0x930 [ 27.882926] [] do_group_exit+0x111/0x340 [ 27.888664] [] ? do_group_exit+0x340/0x340 [ 27.894623] [] SyS_exit_group+0x1d/0x20 [ 27.900329] [] do_syscall_64+0x1a6/0x490 [ 27.906027] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.912935] Code: 55 41 54 53 48 89 fb e8 58 b4 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 23 b4 e6 [ 27.940006] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.946346] RSP [ 27.949945] CR2: ffffeafff8ec8020 [ 27.953382] ---[ end trace 8d71d0dec989a559 ]--- [ 27.958219] Kernel panic - not syncing: Fatal exception [ 27.963875] Dumping ftrace buffer: [ 27.967400] (ftrace buffer empty) [ 27.971088] Kernel Offset: disabled [ 27.974693] Rebooting in 86400 seconds..