[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.257919] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.293201] random: sshd: uninitialized urandom read (32 bytes read) [ 25.569632] random: sshd: uninitialized urandom read (32 bytes read) [ 26.072263] random: sshd: uninitialized urandom read (32 bytes read) [ 38.967719] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.192' (ECDSA) to the list of known hosts. [ 44.569997] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 44.663430] BUG: unable to handle kernel paging request at ffffeafff8e88020 [ 44.670944] IP: [] page_remove_rmap+0x37/0x6d0 [ 44.677298] PGD 0 [ 44.679245] [ 44.680867] Oops: 0000 [#1] PREEMPT SMP KASAN [ 44.685336] Dumping ftrace buffer: [ 44.688848] (ftrace buffer empty) [ 44.692532] Modules linked in: [ 44.695933] CPU: 0 PID: 3816 Comm: syz-executor465 Not tainted 4.9.121-g681e57b #25 [ 44.703707] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.713043] task: ffff8801b7953000 task.stack: ffff8801b62b0000 [ 44.719208] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 44.727891] RSP: 0018:ffff8801b62b7948 EFLAGS: 00010246 [ 44.733318] RAX: dffffc0000000000 RBX: ffffeafff8e88000 RCX: 0000000000000000 [ 44.740564] RDX: 1ffffd5fff1d1004 RSI: ffffffff814f5278 RDI: ffffeafff8e88000 [ 44.747914] RBP: ffff8801b62b7970 R08: 0000000000034520 R09: 0000000000000001 [ 44.755163] R10: ffff8801b7953000 R11: 0000000000000001 R12: ffff8801b62b7c08 [ 44.762411] R13: ffffeafff8e88020 R14: ffffeafff8e88000 R15: 0000000000000001 [ 44.769661] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 44.777866] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 44.783821] CR2: ffffeafff8e88020 CR3: 00000001ba308000 CR4: 00000000001606f0 [ 44.791110] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 44.798368] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 44.805726] Stack: [ 44.807852] ffffeafff8e88020 ffff8801b62b7c08 ffff8801ba2fb800 ffffeafff8e88000 [ 44.815893] ffff8801b621faa8 ffff8801b62b79c8 ffffffff8154c20f ffff8801b62b7c18 [ 44.823895] ffff8801b62b7c10 ffff8801b62b7c88 00003ffe3a2001e0 00000001ba2fb000 [ 44.831998] Call Trace: [ 44.834787] [] zap_huge_pmd+0x16f/0x860 [ 44.840404] [] unmap_page_range+0x12ad/0x1730 [ 44.846536] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 44.852838] [] unmap_single_vma+0x101/0x260 [ 44.858850] [] unmap_vmas+0x102/0x1d0 [ 44.864285] [] exit_mmap+0x214/0x3f0 [ 44.869630] [] ? SyS_munmap+0xa0/0xa0 [ 44.875062] [] ? up_write+0x1a/0x60 [ 44.880316] [] mmput+0xf3/0x2d0 [ 44.885245] [] do_exit+0x906/0x27b0 [ 44.890514] [] ? release_task.part.19+0x1210/0x1210 [ 44.897300] [] ? up_write+0x1a/0x60 [ 44.902586] [] ? do_mprotect_pkey+0x71d/0x890 [ 44.908707] [] ? mprotect_fixup+0x930/0x930 [ 44.914727] [] do_group_exit+0x111/0x340 [ 44.920420] [] ? do_group_exit+0x340/0x340 [ 44.926281] [] SyS_exit_group+0x1d/0x20 [ 44.931890] [] do_syscall_64+0x1a6/0x490 [ 44.937586] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 44.944547] 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 [ 44.972096] RIP [] page_remove_rmap+0x37/0x6d0 [ 44.978434] RSP [ 44.982039] CR2: ffffeafff8e88020 [ 44.985623] ---[ end trace d960568377f71f77 ]--- [ 44.990351] Kernel panic - not syncing: Fatal exception [ 44.996081] Dumping ftrace buffer: [ 44.999606] (ftrace buffer empty) [ 45.003290] Kernel Offset: disabled [ 45.006895] Rebooting in 86400 seconds..