[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.709836] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.364241] random: sshd: uninitialized urandom read (32 bytes read) [ 27.579356] random: sshd: uninitialized urandom read (32 bytes read) [ 27.970947] random: sshd: uninitialized urandom read (32 bytes read) [ 40.905716] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. [ 46.565299] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 46.643775] BUG: unable to handle kernel paging request at ffffeafff9148020 [ 46.651125] IP: [] page_remove_rmap+0x37/0x6d0 [ 46.657370] PGD 0 [ 46.659321] [ 46.660942] Oops: 0000 [#1] PREEMPT SMP KASAN [ 46.665406] Dumping ftrace buffer: [ 46.671348] (ftrace buffer empty) [ 46.675164] Modules linked in: [ 46.678451] CPU: 1 PID: 3812 Comm: syz-executor258 Not tainted 4.9.122-g54068d6 #78 [ 46.686340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.695672] task: ffff8801b84a0000 task.stack: ffff8801d94a8000 [ 46.701699] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 46.710451] RSP: 0018:ffff8801d94af948 EFLAGS: 00010246 [ 46.715875] RAX: dffffc0000000000 RBX: ffffeafff9148000 RCX: 0000000000000000 [ 46.723120] RDX: 1ffffd5fff229004 RSI: ffffffff814f5918 RDI: ffffeafff9148000 [ 46.730364] RBP: ffff8801d94af970 R08: 0000000000034b20 R09: 0000000000000001 [ 46.737617] R10: ffff8801b84a0000 R11: 0000000000000001 R12: ffff8801d94afc08 [ 46.744878] R13: ffffeafff9148020 R14: ffffeafff9148000 R15: 0000000000000001 [ 46.752128] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 46.760330] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.766187] CR2: ffffeafff9148020 CR3: 00000001bf70a000 CR4: 00000000001606f0 [ 46.773434] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.780694] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.788007] Stack: [ 46.790140] ffffeafff9148020 ffff8801d94afc08 ffff8801bf55b800 ffffeafff9148000 [ 46.798297] ffff8801c3c043c8 ffff8801d94af9c8 ffffffff8154cb8f ffff8801d94afc18 [ 46.806290] ffff8801d94afc10 ffff8801d94afc88 00003ffe452001e0 00000001bf55b000 [ 46.814400] Call Trace: [ 46.816969] [] zap_huge_pmd+0x16f/0x860 [ 46.822567] [] unmap_page_range+0x12ad/0x1730 [ 46.828698] [] ? vm_normal_page_pmd+0x310/0x310 [ 46.834993] [] unmap_single_vma+0x101/0x260 [ 46.840937] [] unmap_vmas+0x102/0x1d0 [ 46.846365] [] exit_mmap+0x214/0x3f0 [ 46.851703] [] ? SyS_munmap+0xa0/0xa0 [ 46.857126] [] ? up_write+0x1a/0x60 [ 46.862380] [] mmput+0xf3/0x2d0 [ 46.867300] [] do_exit+0x906/0x27b0 [ 46.872565] [] ? release_task.part.19+0x1210/0x1210 [ 46.879378] [] ? up_write+0x1a/0x60 [ 46.884634] [] ? do_mprotect_pkey+0x71d/0x890 [ 46.890756] [] ? mprotect_fixup+0x930/0x930 [ 46.896702] [] do_group_exit+0x111/0x340 [ 46.902467] [] ? do_group_exit+0x340/0x340 [ 46.908333] [] SyS_exit_group+0x1d/0x20 [ 46.913940] [] do_syscall_64+0x1a6/0x490 [ 46.919710] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 46.926606] 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 [ 46.953447] RIP [] page_remove_rmap+0x37/0x6d0 [ 46.959777] RSP [ 46.963382] CR2: ffffeafff9148020 [ 46.966813] ---[ end trace 952bc0db32f19842 ]--- [ 46.971539] Kernel panic - not syncing: Fatal exception [ 46.977326] Dumping ftrace buffer: [ 46.980850] (ftrace buffer empty) [ 46.984532] Kernel Offset: disabled [ 46.988131] Rebooting in 86400 seconds..