[....] 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[ 14.442237] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.170108] random: sshd: uninitialized urandom read (32 bytes read) [ 17.567330] random: sshd: uninitialized urandom read (32 bytes read) [ 18.024069] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 23.782854] urandom_read: 1 callbacks suppressed [ 23.782857] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.873224] BUG: unable to handle kernel paging request at ffffeafff8df0020 [ 23.880601] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.886862] PGD 0 [ 23.888807] [ 23.890430] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.894899] Dumping ftrace buffer: [ 23.898413] (ftrace buffer empty) [ 23.902095] Modules linked in: [ 23.905390] CPU: 1 PID: 3686 Comm: syz-executor513 Not tainted 4.9.121-g681e57b #25 [ 23.913156] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.922503] task: ffff8801c29ec800 task.stack: ffff8801c1bf8000 [ 23.928529] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.937200] RSP: 0018:ffff8801c1bff948 EFLAGS: 00010246 [ 23.942621] RAX: dffffc0000000000 RBX: ffffeafff8df0000 RCX: 0000000000000000 [ 23.949866] RDX: 1ffffd5fff1be004 RSI: ffffffff814f5278 RDI: ffffeafff8df0000 [ 23.957108] RBP: ffff8801c1bff970 R08: 0000000000033760 R09: 0000000000000001 [ 23.964353] R10: ffff8801c29ec800 R11: 0000000000000001 R12: ffff8801c1bffc08 [ 23.971595] R13: ffffeafff8df0020 R14: ffffeafff8df0000 R15: 0000000000000001 [ 23.978840] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 23.987052] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.992907] CR2: ffffeafff8df0020 CR3: 00000001c6866000 CR4: 00000000001606f0 [ 24.000149] Stack: [ 24.002268] ffffeafff8df0020 ffff8801c1bffc08 ffff8801c685f800 ffffeafff8df0000 [ 24.010242] ffff8801c2357210 ffff8801c1bff9c8 ffffffff8154c20f ffff8801c1bffc18 [ 24.018236] ffff8801c1bffc10 ffff8801c1bffc88 00003ffe37c001e0 00000001c685f000 [ 24.026279] Call Trace: [ 24.028855] [] zap_huge_pmd+0x16f/0x860 [ 24.034470] [] unmap_page_range+0x12ad/0x1730 [ 24.040590] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 24.046886] [] unmap_single_vma+0x101/0x260 [ 24.052838] [] unmap_vmas+0x102/0x1d0 [ 24.058263] [] exit_mmap+0x214/0x3f0 [ 24.063613] [] ? SyS_munmap+0xa0/0xa0 [ 24.069038] [] ? up_write+0x1a/0x60 [ 24.074292] [] mmput+0xf3/0x2d0 [ 24.079213] [] do_exit+0x906/0x27b0 [ 24.084464] [] ? release_task.part.19+0x1210/0x1210 [ 24.091105] [] ? up_write+0x1a/0x60 [ 24.096356] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.102475] [] ? mprotect_fixup+0x930/0x930 [ 24.108446] [] do_group_exit+0x111/0x340 [ 24.114133] [] ? do_group_exit+0x340/0x340 [ 24.120019] [] SyS_exit_group+0x1d/0x20 [ 24.125629] [] do_syscall_64+0x1a6/0x490 [ 24.131310] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.138202] 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 [ 24.165201] RIP [] page_remove_rmap+0x37/0x6d0 [ 24.171520] RSP [ 24.175129] CR2: ffffeafff8df0020 [ 24.178556] ---[ end trace c5bdabaa6bb43c65 ]--- [ 24.183279] Kernel panic - not syncing: Fatal exception [ 24.188939] Dumping ftrace buffer: [ 24.192461] (ftrace buffer empty) [ 24.196146] Kernel Offset: disabled [ 24.199748] Rebooting in 86400 seconds..