[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.134695] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.737823] random: sshd: uninitialized urandom read (32 bytes read) [ 21.183929] random: sshd: uninitialized urandom read (32 bytes read) [ 21.659541] random: sshd: uninitialized urandom read (32 bytes read) [ 31.011740] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. [ 36.743274] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.819930] BUG: unable to handle kernel paging request at ffffeafff9178020 [ 36.827516] IP: [] page_remove_rmap+0x37/0x6d0 [ 36.833760] PGD 0 [ 36.835773] [ 36.837402] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.841868] Dumping ftrace buffer: [ 36.845380] (ftrace buffer empty) [ 36.849064] Modules linked in: [ 36.852358] CPU: 0 PID: 3807 Comm: syz-executor142 Not tainted 4.9.121-g681e57b #77 [ 36.860124] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.869452] task: ffff8801b829b000 task.stack: ffff8801da3b0000 [ 36.875479] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 36.884160] RSP: 0018:ffff8801da3b7948 EFLAGS: 00010246 [ 36.889580] RAX: dffffc0000000000 RBX: ffffeafff9178000 RCX: 0000000000000000 [ 36.896823] RDX: 1ffffd5fff22f004 RSI: ffffffff814f5278 RDI: ffffeafff9178000 [ 36.904065] RBP: ffff8801da3b7970 R08: 0000000000033cc0 R09: 0000000000000001 [ 36.911413] R10: ffff8801b829b000 R11: 0000000000000001 R12: ffff8801da3b7c08 [ 36.918658] R13: ffffeafff9178020 R14: ffffeafff9178000 R15: 0000000000000001 [ 36.925904] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.934107] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.939963] CR2: ffffeafff9178020 CR3: 00000001c7c85000 CR4: 00000000001606f0 [ 36.947247] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.954555] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.961813] Stack: [ 36.963938] ffffeafff9178020 ffff8801da3b7c08 ffff8801c7c7c800 ffffeafff9178000 [ 36.971918] ffff8801c7eb8318 ffff8801da3b79c8 ffffffff8154c20f ffff8801da3b7c18 [ 36.979896] ffff8801da3b7c10 ffff8801da3b7c88 00003ffe45e001e0 00000001c7c7c000 [ 36.987872] Call Trace: [ 36.990444] [] zap_huge_pmd+0x16f/0x860 [ 36.996087] [] unmap_page_range+0x12ad/0x1730 [ 37.002214] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 37.008508] [] unmap_single_vma+0x101/0x260 [ 37.014511] [] unmap_vmas+0x102/0x1d0 [ 37.019947] [] exit_mmap+0x214/0x3f0 [ 37.025608] [] ? SyS_munmap+0xa0/0xa0 [ 37.031037] [] ? up_write+0x1a/0x60 [ 37.036290] [] mmput+0xf3/0x2d0 [ 37.041193] [] do_exit+0x906/0x27b0 [ 37.046442] [] ? release_task.part.19+0x1210/0x1210 [ 37.053132] [] ? up_write+0x1a/0x60 [ 37.058392] [] ? do_mprotect_pkey+0x71d/0x890 [ 37.064512] [] ? mprotect_fixup+0x930/0x930 [ 37.070463] [] do_group_exit+0x111/0x340 [ 37.076152] [] ? do_group_exit+0x340/0x340 [ 37.082022] [] SyS_exit_group+0x1d/0x20 [ 37.087621] [] do_syscall_64+0x1a6/0x490 [ 37.093313] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 37.100209] Code: 55 41 54 53 48 89 fb e8 c8 b6 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 93 b6 e6 [ 37.126924] RIP [] page_remove_rmap+0x37/0x6d0 [ 37.133255] RSP [ 37.136853] CR2: ffffeafff9178020 [ 37.140284] ---[ end trace cfc355f8567a61b3 ]--- [ 37.145010] Kernel panic - not syncing: Fatal exception [ 37.150739] Dumping ftrace buffer: [ 37.154262] (ftrace buffer empty) [ 37.157943] Kernel Offset: disabled [ 37.161543] Rebooting in 86400 seconds..