[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.233766] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.959168] random: sshd: uninitialized urandom read (32 bytes read) [ 18.294849] random: sshd: uninitialized urandom read (32 bytes read) [ 18.809038] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts. [ 24.416811] urandom_read: 1 callbacks suppressed [ 24.416814] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.510136] BUG: unable to handle kernel paging request at ffffeafff8df8020 [ 24.517500] IP: [] page_remove_rmap+0x37/0x6d0 [ 24.523750] PGD 0 [ 24.525698] [ 24.527325] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.531793] Dumping ftrace buffer: [ 24.535306] (ftrace buffer empty) [ 24.538989] Modules linked in: [ 24.542276] CPU: 0 PID: 3779 Comm: syz-executor253 Not tainted 4.9.120-gf85543b #76 [ 24.550052] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.559402] task: ffff8801ba7eb000 task.stack: ffff8801c3378000 [ 24.565437] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.574118] RSP: 0018:ffff8801c337f948 EFLAGS: 00010246 [ 24.579540] RAX: dffffc0000000000 RBX: ffffeafff8df8000 RCX: ffffea0007200000 [ 24.586789] RDX: 1ffffd5fff1bf004 RSI: ffffffff814f5128 RDI: ffffeafff8df8000 [ 24.594035] RBP: ffff8801c337f970 R08: 0000000000033ae0 R09: 0000000000000001 [ 24.601278] R10: ffff8801ba7eb000 R11: 0000000000000001 R12: ffff8801c337fc08 [ 24.608523] R13: ffffeafff8df8020 R14: ffffeafff8df8000 R15: 0000000000000001 [ 24.615771] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 24.623971] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.629835] CR2: ffffeafff8df8020 CR3: 00000001c4211000 CR4: 00000000001606f0 [ 24.637080] Stack: [ 24.639206] ffffeafff8df8020 ffff8801c337fc08 ffff8801c434e810 ffffeafff8df8000 [ 24.647199] ffff8801cafd29f8 ffff8801c337f9c8 ffffffff8154bfcf ffff8801c337fc18 [ 24.655201] ffff8801c337fc10 ffff8801c337fc88 00003ffe37e001a0 00000001c434e000 [ 24.663196] Call Trace: [ 24.665762] [] zap_huge_pmd+0x16f/0x860 [ 24.671362] [] unmap_page_range+0x12ad/0x1730 [ 24.677487] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 24.683784] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 24.690707] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 24.697532] [] unmap_single_vma+0x101/0x260 [ 24.703484] [] unmap_vmas+0x102/0x1d0 [ 24.708915] [] exit_mmap+0x214/0x3f0 [ 24.714258] [] ? SyS_munmap+0xa0/0xa0 [ 24.719701] [] ? up_write+0x1a/0x60 [ 24.724955] [] mmput+0xf3/0x2d0 [ 24.729859] [] do_exit+0x906/0x27b0 [ 24.735157] [] ? release_task.part.19+0x1210/0x1210 [ 24.741819] [] ? up_write+0x1a/0x60 [ 24.747073] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.753192] [] ? mprotect_fixup+0x930/0x930 [ 24.759146] [] do_group_exit+0x111/0x340 [ 24.764836] [] ? do_group_exit+0x340/0x340 [ 24.770696] [] SyS_exit_group+0x1d/0x20 [ 24.776297] [] do_syscall_64+0x1a6/0x490 [ 24.781986] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.788889] 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 [ 24.815840] RIP [] page_remove_rmap+0x37/0x6d0 [ 24.822190] RSP [ 24.825788] CR2: ffffeafff8df8020 [ 24.829219] ---[ end trace edb34846a01def94 ]--- [ 24.833946] Kernel panic - not syncing: Fatal exception [ 24.839641] Dumping ftrace buffer: [ 24.843169] (ftrace buffer empty) [ 24.846857] Kernel Offset: disabled [ 24.850459] Rebooting in 86400 seconds..