[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.118560] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.287961] random: sshd: uninitialized urandom read (32 bytes read) [ 21.506616] random: sshd: uninitialized urandom read (32 bytes read) [ 21.979566] random: sshd: uninitialized urandom read (32 bytes read) [ 36.686504] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.193' (ECDSA) to the list of known hosts. [ 42.193460] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 42.274948] BUG: unable to handle kernel paging request at ffffeafff9138020 [ 42.282309] IP: [] page_remove_rmap+0x37/0x6d0 [ 42.288571] PGD 0 [ 42.290517] [ 42.292177] Oops: 0000 [#1] PREEMPT SMP KASAN [ 42.296649] Dumping ftrace buffer: [ 42.300165] (ftrace buffer empty) [ 42.303850] Modules linked in: [ 42.307139] CPU: 1 PID: 3809 Comm: syz-executor682 Not tainted 4.9.122-g54068d6 #78 [ 42.314947] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.324284] task: ffff8801c069e000 task.stack: ffff8801b9398000 [ 42.330315] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 42.339003] RSP: 0018:ffff8801b939f948 EFLAGS: 00010246 [ 42.344427] RAX: dffffc0000000000 RBX: ffffeafff9138000 RCX: 0000000000000000 [ 42.351675] RDX: 1ffffd5fff227004 RSI: ffffffff814f5918 RDI: ffffeafff9138000 [ 42.358925] RBP: ffff8801b939f970 R08: 0000000000034280 R09: 0000000000000001 [ 42.366171] R10: ffff8801c069e000 R11: 0000000000000001 R12: ffff8801b939fc08 [ 42.373417] R13: ffffeafff9138020 R14: ffffeafff9138000 R15: 0000000000000001 [ 42.380666] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 42.388870] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.394728] CR2: ffffeafff9138020 CR3: 00000001bad54000 CR4: 00000000001606f0 [ 42.402087] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.409336] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.416617] Stack: [ 42.418748] ffffeafff9138020 ffff8801b939fc08 ffff8801cac55800 ffffeafff9138000 [ 42.426753] ffff8801bd131898 ffff8801b939f9c8 ffffffff8154cb8f ffff8801b939fc18 [ 42.434788] ffff8801b939fc10 ffff8801b939fc88 00003ffe44e001e0 00000001cac55000 [ 42.442891] Call Trace: [ 42.445531] [] zap_huge_pmd+0x16f/0x860 [ 42.451140] [] unmap_page_range+0x12ad/0x1730 [ 42.457259] [] ? vm_normal_page_pmd+0x310/0x310 [ 42.463656] [] unmap_single_vma+0x101/0x260 [ 42.469608] [] unmap_vmas+0x102/0x1d0 [ 42.475041] [] exit_mmap+0x214/0x3f0 [ 42.480381] [] ? SyS_munmap+0xa0/0xa0 [ 42.485811] [] ? up_write+0x1a/0x60 [ 42.491070] [] mmput+0xf3/0x2d0 [ 42.495982] [] do_exit+0x906/0x27b0 [ 42.501241] [] ? release_task.part.19+0x1210/0x1210 [ 42.507885] [] ? up_write+0x1a/0x60 [ 42.513140] [] ? do_mprotect_pkey+0x71d/0x890 [ 42.519260] [] ? mprotect_fixup+0x930/0x930 [ 42.525247] [] do_group_exit+0x111/0x340 [ 42.530943] [] ? do_group_exit+0x340/0x340 [ 42.536809] [] SyS_exit_group+0x1d/0x20 [ 42.542411] [] do_syscall_64+0x1a6/0x490 [ 42.548098] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 42.555034] 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 [ 42.582190] RIP [] page_remove_rmap+0x37/0x6d0 [ 42.588578] RSP [ 42.592187] CR2: ffffeafff9138020 [ 42.595619] ---[ end trace aeb8142d1b343dc9 ]--- [ 42.600350] Kernel panic - not syncing: Fatal exception [ 42.606057] Dumping ftrace buffer: [ 42.609583] (ftrace buffer empty) [ 42.613272] Kernel Offset: disabled [ 42.616880] Rebooting in 86400 seconds..