[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.567480] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.027183] random: sshd: uninitialized urandom read (32 bytes read) [ 21.339568] random: sshd: uninitialized urandom read (32 bytes read) [ 21.881709] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts. [ 27.533434] urandom_read: 1 callbacks suppressed [ 27.533437] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.617160] BUG: unable to handle kernel paging request at ffffeafff8dd8020 [ 27.624533] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.630792] PGD 0 [ 27.632744] [ 27.634391] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.638869] Dumping ftrace buffer: [ 27.642395] (ftrace buffer empty) [ 27.646175] Modules linked in: [ 27.649494] CPU: 0 PID: 3795 Comm: syz-executor814 Not tainted 4.9.120-gf85543b #76 [ 27.657425] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.666768] task: ffff8801b8f34800 task.stack: ffff8801da3b0000 [ 27.672807] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.681501] RSP: 0018:ffff8801da3b7948 EFLAGS: 00010246 [ 27.686936] RAX: dffffc0000000000 RBX: ffffeafff8dd8000 RCX: 0000000000000000 [ 27.694192] RDX: 1ffffd5fff1bb004 RSI: ffffffff814f5128 RDI: ffffeafff8dd8000 [ 27.701450] RBP: ffff8801da3b7970 R08: 0000000000033a80 R09: 0000000000000001 [ 27.708824] R10: ffff8801b8f34800 R11: 0000000000000001 R12: ffff8801da3b7c08 [ 27.716209] R13: ffffeafff8dd8020 R14: ffffeafff8dd8000 R15: 0000000000000001 [ 27.723463] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.731878] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.737748] CR2: ffffeafff8dd8020 CR3: 00000001c87a8000 CR4: 00000000001606f0 [ 27.745004] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.752405] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.759850] Stack: [ 27.762114] ffffeafff8dd8020 ffff8801da3b7c08 ffff8801c9570800 ffffeafff8dd8000 [ 27.770333] ffff8801babf2ec8 ffff8801da3b79c8 ffffffff8154bfcf ffff8801da3b7c18 [ 27.778515] ffff8801da3b7c10 ffff8801da3b7c88 00003ffe376001e0 00000001c9570000 [ 27.786542] Call Trace: [ 27.789243] [] zap_huge_pmd+0x16f/0x860 [ 27.794853] [] unmap_page_range+0x12ad/0x1730 [ 27.801103] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.807497] [] unmap_single_vma+0x101/0x260 [ 27.813552] [] unmap_vmas+0x102/0x1d0 [ 27.818995] [] exit_mmap+0x214/0x3f0 [ 27.824625] [] ? SyS_munmap+0xa0/0xa0 [ 27.830073] [] ? up_write+0x1a/0x60 [ 27.835484] [] mmput+0xf3/0x2d0 [ 27.840413] [] do_exit+0x906/0x27b0 [ 27.846016] [] ? release_task.part.19+0x1210/0x1210 [ 27.853110] [] ? up_write+0x1a/0x60 [ 27.858703] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.865082] [] ? mprotect_fixup+0x930/0x930 [ 27.871280] [] do_group_exit+0x111/0x340 [ 27.877109] [] ? do_group_exit+0x340/0x340 [ 27.883239] [] SyS_exit_group+0x1d/0x20 [ 27.888971] [] do_syscall_64+0x1a6/0x490 [ 27.894671] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.901579] 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 [ 27.929334] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.935720] RSP [ 27.939420] CR2: ffffeafff8dd8020 [ 27.942866] ---[ end trace 2d9b77a365a5deca ]--- [ 27.947772] Kernel panic - not syncing: Fatal exception [ 27.953626] Dumping ftrace buffer: [ 27.957160] (ftrace buffer empty) [ 27.960851] Kernel Offset: disabled [ 27.964458] Rebooting in 86400 seconds..