[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.574749] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.117452] random: sshd: uninitialized urandom read (32 bytes read) [ 19.305812] random: sshd: uninitialized urandom read (32 bytes read) [ 19.779751] random: sshd: uninitialized urandom read (32 bytes read) [ 41.567531] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. [ 47.049336] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 47.132271] BUG: unable to handle kernel paging request at ffffeafff90f0020 [ 47.139968] IP: [] page_remove_rmap+0x37/0x6d0 [ 47.146261] PGD 0 [ 47.148225] [ 47.149866] Oops: 0000 [#1] PREEMPT SMP KASAN [ 47.154350] Dumping ftrace buffer: [ 47.157879] (ftrace buffer empty) [ 47.161706] Modules linked in: [ 47.165033] CPU: 0 PID: 3801 Comm: syz-executor891 Not tainted 4.9.122-g54068d6 #78 [ 47.173097] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.182565] task: ffff8801b86c9800 task.stack: ffff8801b9fe0000 [ 47.188657] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 47.197372] RSP: 0018:ffff8801b9fe7948 EFLAGS: 00010246 [ 47.202926] RAX: dffffc0000000000 RBX: ffffeafff90f0000 RCX: ffffea0006da8000 [ 47.210350] RDX: 1ffffd5fff21e004 RSI: ffffffff814f5918 RDI: ffffeafff90f0000 [ 47.217817] RBP: ffff8801b9fe7970 R08: 00000000000345c0 R09: 0000000000000001 [ 47.225082] R10: ffff8801b86c9800 R11: 0000000000000001 R12: ffff8801b9fe7c08 [ 47.232463] R13: ffffeafff90f0020 R14: ffffeafff90f0000 R15: 0000000000000001 [ 47.239739] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 47.248116] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.253990] CR2: ffffeafff90f0020 CR3: 00000001c312b000 CR4: 00000000001606f0 [ 47.261254] Stack: [ 47.263856] ffffeafff90f0020 ffff8801b9fe7c08 ffff8801c31ae800 ffffeafff90f0000 [ 47.271964] ffff8801b851c8f0 ffff8801b9fe79c8 ffffffff8154cb8f ffff8801b9fe7c18 [ 47.280248] ffff8801b9fe7c10 ffff8801b9fe7c88 00003ffe43c001e0 00000001c31ae000 [ 47.288622] Call Trace: [ 47.291210] [] zap_huge_pmd+0x16f/0x860 [ 47.296832] [] unmap_page_range+0x12ad/0x1730 [ 47.302970] [] ? vm_normal_page_pmd+0x310/0x310 [ 47.309285] [] unmap_single_vma+0x101/0x260 [ 47.315249] [] unmap_vmas+0x102/0x1d0 [ 47.320691] [] exit_mmap+0x214/0x3f0 [ 47.326044] [] ? SyS_munmap+0xa0/0xa0 [ 47.331775] [] ? up_write+0x1a/0x60 [ 47.337199] [] mmput+0xf3/0x2d0 [ 47.342245] [] do_exit+0x906/0x27b0 [ 47.347521] [] ? release_task.part.19+0x1210/0x1210 [ 47.354399] [] ? up_write+0x1a/0x60 [ 47.359677] [] ? do_mprotect_pkey+0x71d/0x890 [ 47.366018] [] ? mprotect_fixup+0x930/0x930 [ 47.371989] [] do_group_exit+0x111/0x340 [ 47.377942] [] ? do_group_exit+0x340/0x340 [ 47.383819] [] SyS_exit_group+0x1d/0x20 [ 47.389624] [] do_syscall_64+0x1a6/0x490 [ 47.395332] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 47.402250] 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 [ 47.431276] RIP [] page_remove_rmap+0x37/0x6d0 [ 47.437659] RSP [ 47.441477] CR2: ffffeafff90f0020 [ 47.444929] ---[ end trace 8fb8a4abf18086ff ]--- [ 47.449935] Kernel panic - not syncing: Fatal exception [ 47.455828] Dumping ftrace buffer: [ 47.459372] (ftrace buffer empty) [ 47.463076] Kernel Offset: disabled [ 47.466812] Rebooting in 86400 seconds..