[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.435565] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.511610] random: sshd: uninitialized urandom read (32 bytes read) [ 18.699408] random: sshd: uninitialized urandom read (32 bytes read) [ 19.187761] random: sshd: uninitialized urandom read (32 bytes read) [ 35.973359] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. [ 41.584832] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 41.669142] BUG: unable to handle kernel paging request at ffffeafff9140020 [ 41.676619] IP: [] page_remove_rmap+0x37/0x6d0 [ 41.682873] PGD 0 [ 41.684824] [ 41.686448] Oops: 0000 [#1] PREEMPT SMP KASAN [ 41.690918] Dumping ftrace buffer: [ 41.694429] (ftrace buffer empty) [ 41.698112] Modules linked in: [ 41.701399] CPU: 1 PID: 3808 Comm: syz-executor474 Not tainted 4.9.122-g54068d6 #78 [ 41.709163] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.718496] task: ffff8801b8896000 task.stack: ffff8801c8fc0000 [ 41.724531] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 41.733215] RSP: 0018:ffff8801c8fc7948 EFLAGS: 00010246 [ 41.738639] RAX: dffffc0000000000 RBX: ffffeafff9140000 RCX: 0000000000000000 [ 41.745993] RDX: 1ffffd5fff228004 RSI: ffffffff814f5918 RDI: ffffeafff9140000 [ 41.753242] RBP: ffff8801c8fc7970 R08: 0000000000034aa0 R09: 0000000000000001 [ 41.760486] R10: ffff8801b8896000 R11: 0000000000000001 R12: ffff8801c8fc7c08 [ 41.767891] R13: ffffeafff9140020 R14: ffffeafff9140000 R15: 0000000000000001 [ 41.775150] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 41.783350] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.789210] CR2: ffffeafff9140020 CR3: 00000001ba31e000 CR4: 00000000001606f0 [ 41.796502] Stack: [ 41.798633] ffffeafff9140020 ffff8801c8fc7c08 ffff8801c531c800 ffffeafff9140000 [ 41.806623] ffff8801c9ff7898 ffff8801c8fc79c8 ffffffff8154cb8f ffff8801c8fc7c18 [ 41.814615] ffff8801c8fc7c10 ffff8801c8fc7c88 00003ffe450001e0 00000001c531c000 [ 41.822603] Call Trace: [ 41.825172] [] zap_huge_pmd+0x16f/0x860 [ 41.830773] [] unmap_page_range+0x12ad/0x1730 [ 41.837000] [] ? vm_normal_page_pmd+0x310/0x310 [ 41.843300] [] unmap_single_vma+0x101/0x260 [ 41.849254] [] unmap_vmas+0x102/0x1d0 [ 41.854678] [] exit_mmap+0x214/0x3f0 [ 41.860122] [] ? SyS_munmap+0xa0/0xa0 [ 41.865554] [] ? up_write+0x1a/0x60 [ 41.870811] [] mmput+0xf3/0x2d0 [ 41.875732] [] do_exit+0x906/0x27b0 [ 41.881086] [] ? release_task.part.19+0x1210/0x1210 [ 41.887731] [] ? up_write+0x1a/0x60 [ 41.892984] [] ? do_mprotect_pkey+0x71d/0x890 [ 41.899109] [] ? mprotect_fixup+0x930/0x930 [ 41.905063] [] do_group_exit+0x111/0x340 [ 41.910752] [] ? do_group_exit+0x340/0x340 [ 41.916610] [] SyS_exit_group+0x1d/0x20 [ 41.922211] [] do_syscall_64+0x1a6/0x490 [ 41.927901] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 41.934864] 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 [ 41.961888] RIP [] page_remove_rmap+0x37/0x6d0 [ 41.968224] RSP [ 41.971823] CR2: ffffeafff9140020 [ 41.975256] ---[ end trace ad0cb63fb58c4aa1 ]--- [ 41.979984] Kernel panic - not syncing: Fatal exception [ 41.985452] Dumping ftrace buffer: [ 41.988974] (ftrace buffer empty) [ 41.992659] Kernel Offset: disabled [ 41.996264] Rebooting in 86400 seconds..