[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.288443] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.800777] random: sshd: uninitialized urandom read (32 bytes read) [ 16.074426] random: sshd: uninitialized urandom read (32 bytes read) [ 16.574028] random: sshd: uninitialized urandom read (32 bytes read) [ 25.980945] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 31.580107] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.661047] BUG: unable to handle kernel paging request at ffffeafff9118020 [ 31.668426] IP: [] page_remove_rmap+0x37/0x6d0 [ 31.674669] PGD 0 [ 31.676611] [ 31.678233] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.682779] Dumping ftrace buffer: [ 31.686295] (ftrace buffer empty) [ 31.689985] Modules linked in: [ 31.693276] CPU: 0 PID: 3797 Comm: syz-executor055 Not tainted 4.9.121-g681e57b #77 [ 31.701046] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.710381] task: ffff8801b85e1800 task.stack: ffff8801c5ec8000 [ 31.716411] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 31.725089] RSP: 0018:ffff8801c5ecf948 EFLAGS: 00010246 [ 31.730510] RAX: dffffc0000000000 RBX: ffffeafff9118000 RCX: 0000000000000000 [ 31.737753] RDX: 1ffffd5fff223004 RSI: ffffffff814f5278 RDI: ffffeafff9118000 [ 31.744999] RBP: ffff8801c5ecf970 R08: 0000000000033ea0 R09: 0000000000000001 [ 31.752253] R10: ffff8801b85e1800 R11: 0000000000000001 R12: ffff8801c5ecfc08 [ 31.759499] R13: ffffeafff9118020 R14: ffffeafff9118000 R15: 0000000000000001 [ 31.766742] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.774945] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.780807] CR2: ffffeafff9118020 CR3: 00000001ca6d8000 CR4: 00000000001606f0 [ 31.788052] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.795300] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.802543] Stack: [ 31.804669] ffffeafff9118020 ffff8801c5ecfc08 ffff8801b8885800 ffffeafff9118000 [ 31.812661] ffff8801cb21e370 ffff8801c5ecf9c8 ffffffff8154c20f ffff8801c5ecfc18 [ 31.820647] ffff8801c5ecfc10 ffff8801c5ecfc88 00003ffe446001e0 00000001b8885000 [ 31.828635] Call Trace: [ 31.831200] [] zap_huge_pmd+0x16f/0x860 [ 31.836800] [] unmap_page_range+0x12ad/0x1730 [ 31.842919] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 31.849212] [] unmap_single_vma+0x101/0x260 [ 31.855157] [] unmap_vmas+0x102/0x1d0 [ 31.860581] [] exit_mmap+0x214/0x3f0 [ 31.865961] [] ? SyS_munmap+0xa0/0xa0 [ 31.871392] [] ? up_write+0x1a/0x60 [ 31.876644] [] mmput+0xf3/0x2d0 [ 31.881549] [] do_exit+0x906/0x27b0 [ 31.886804] [] ? release_task.part.19+0x1210/0x1210 [ 31.893449] [] ? up_write+0x1a/0x60 [ 31.898702] [] ? do_mprotect_pkey+0x71d/0x890 [ 31.904819] [] ? mprotect_fixup+0x930/0x930 [ 31.910763] [] do_group_exit+0x111/0x340 [ 31.916448] [] ? do_group_exit+0x340/0x340 [ 31.922308] [] SyS_exit_group+0x1d/0x20 [ 31.927905] [] do_syscall_64+0x1a6/0x490 [ 31.933597] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 31.940496] 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 [ 31.967488] RIP [] page_remove_rmap+0x37/0x6d0 [ 31.973822] RSP [ 31.977418] CR2: ffffeafff9118020 [ 31.980848] ---[ end trace 5aac5907135adae2 ]--- [ 31.985574] Kernel panic - not syncing: Fatal exception [ 31.991273] Dumping ftrace buffer: [ 31.994793] (ftrace buffer empty) [ 31.998475] Kernel Offset: disabled [ 32.002074] Rebooting in 86400 seconds..