[....] 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[ 14.672195] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.881493] random: sshd: uninitialized urandom read (32 bytes read) [ 27.235771] random: sshd: uninitialized urandom read (32 bytes read) [ 27.752663] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 33.387898] urandom_read: 1 callbacks suppressed [ 33.387901] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.473396] BUG: unable to handle kernel paging request at ffffeafff8da0020 [ 33.480832] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.487086] PGD 0 [ 33.489033] [ 33.490654] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.495123] Dumping ftrace buffer: [ 33.498738] (ftrace buffer empty) [ 33.502432] Modules linked in: [ 33.505719] CPU: 1 PID: 3789 Comm: syz-executor002 Not tainted 4.9.122-g54068d6 #78 [ 33.513490] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.522824] task: ffff8801bab96000 task.stack: ffff8801d9840000 [ 33.528856] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.537541] RSP: 0018:ffff8801d9847948 EFLAGS: 00010246 [ 33.543072] RAX: dffffc0000000000 RBX: ffffeafff8da0000 RCX: ffffea0006dd8000 [ 33.550317] RDX: 1ffffd5fff1b4004 RSI: ffffffff814f5918 RDI: ffffeafff8da0000 [ 33.557563] RBP: ffff8801d9847970 R08: 0000000000034280 R09: 0000000000000001 [ 33.564817] R10: ffff8801bab96000 R11: 0000000000000001 R12: ffff8801d9847c08 [ 33.572067] R13: ffffeafff8da0020 R14: ffffeafff8da0000 R15: 0000000000000001 [ 33.579318] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.587521] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.593391] CR2: ffffeafff8da0020 CR3: 00000001c7168000 CR4: 00000000001606f0 [ 33.600688] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.607946] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.615194] Stack: [ 33.617325] ffffeafff8da0020 ffff8801d9847c08 ffff8801c9c17800 ffffeafff8da0000 [ 33.625331] ffff8801c5478f78 ffff8801d98479c8 ffffffff8154cb8f ffff8801d9847c18 [ 33.633345] ffff8801d9847c10 ffff8801d9847c88 00003ffe368001e0 00000001c9c17000 [ 33.641412] Call Trace: [ 33.643987] [] zap_huge_pmd+0x16f/0x860 [ 33.649595] [] unmap_page_range+0x12ad/0x1730 [ 33.655771] [] ? vm_normal_page_pmd+0x310/0x310 [ 33.662077] [] unmap_single_vma+0x101/0x260 [ 33.668031] [] unmap_vmas+0x102/0x1d0 [ 33.673463] [] exit_mmap+0x214/0x3f0 [ 33.678805] [] ? SyS_munmap+0xa0/0xa0 [ 33.684339] [] ? up_write+0x1a/0x60 [ 33.689645] [] mmput+0xf3/0x2d0 [ 33.694569] [] do_exit+0x906/0x27b0 [ 33.699878] [] ? release_task.part.19+0x1210/0x1210 [ 33.706531] [] ? up_write+0x1a/0x60 [ 33.711794] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.717921] [] ? mprotect_fixup+0x930/0x930 [ 33.723873] [] do_group_exit+0x111/0x340 [ 33.729566] [] ? do_group_exit+0x340/0x340 [ 33.735434] [] SyS_exit_group+0x1d/0x20 [ 33.741078] [] do_syscall_64+0x1a6/0x490 [ 33.746781] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.753684] 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 [ 33.780951] RIP [] page_remove_rmap+0x37/0x6d0 [ 33.787393] RSP [ 33.790997] CR2: ffffeafff8da0020 [ 33.794433] ---[ end trace e1fac0d8d53d2770 ]--- [ 33.799166] Kernel panic - not syncing: Fatal exception [ 33.804859] Dumping ftrace buffer: [ 33.808380] (ftrace buffer empty) [ 33.812070] Kernel Offset: disabled [ 33.815678] Rebooting in 86400 seconds..