[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.279994] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.033251] random: sshd: uninitialized urandom read (32 bytes read) [ 20.268275] random: sshd: uninitialized urandom read (32 bytes read) [ 20.786578] random: sshd: uninitialized urandom read (32 bytes read) [ 37.634216] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.57' (ECDSA) to the list of known hosts. [ 43.265307] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 43.348369] BUG: unable to handle kernel paging request at ffffeafff8f28020 [ 43.355806] IP: [] page_remove_rmap+0x37/0x6d0 [ 43.362058] PGD 0 [ 43.364014] [ 43.365634] Oops: 0000 [#1] PREEMPT SMP KASAN [ 43.370102] Dumping ftrace buffer: [ 43.373621] (ftrace buffer empty) [ 43.377309] Modules linked in: [ 43.380608] CPU: 1 PID: 3728 Comm: syz-executor967 Not tainted 4.9.121-g681e57b #77 [ 43.388378] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.397708] task: ffff8801c0aa1800 task.stack: ffff8801bfb00000 [ 43.403849] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 43.412527] RSP: 0018:ffff8801bfb07948 EFLAGS: 00010246 [ 43.417950] RAX: dffffc0000000000 RBX: ffffeafff8f28000 RCX: 0000000000000000 [ 43.425193] RDX: 1ffffd5fff1e5004 RSI: ffffffff814f5278 RDI: ffffeafff8f28000 [ 43.432548] RBP: ffff8801bfb07970 R08: 00000000000340e0 R09: 0000000000000001 [ 43.439801] R10: ffff8801c0aa1800 R11: 0000000000000001 R12: ffff8801bfb07c08 [ 43.447063] R13: ffffeafff8f28020 R14: ffffeafff8f28000 R15: 0000000000000001 [ 43.454313] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 43.462514] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.468371] CR2: ffffeafff8f28020 CR3: 00000001c3e40000 CR4: 00000000001606f0 [ 43.475620] Stack: [ 43.477748] ffffeafff8f28020 ffff8801bfb07c08 ffff8801c3e04800 ffffeafff8f28000 [ 43.485740] ffff8801c0db7f20 ffff8801bfb079c8 ffffffff8154c20f ffff8801bfb07c18 [ 43.493730] ffff8801bfb07c10 ffff8801bfb07c88 00003ffe3ca001e0 00000001c3e04000 [ 43.501730] Call Trace: [ 43.504297] [] zap_huge_pmd+0x16f/0x860 [ 43.509900] [] unmap_page_range+0x12ad/0x1730 [ 43.516020] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 43.522313] [] unmap_single_vma+0x101/0x260 [ 43.528357] [] unmap_vmas+0x102/0x1d0 [ 43.533787] [] exit_mmap+0x214/0x3f0 [ 43.539124] [] ? SyS_munmap+0xa0/0xa0 [ 43.544547] [] ? up_write+0x1a/0x60 [ 43.549801] [] mmput+0xf3/0x2d0 [ 43.554710] [] do_exit+0x906/0x27b0 [ 43.560009] [] ? release_task.part.19+0x1210/0x1210 [ 43.566654] [] ? up_write+0x1a/0x60 [ 43.571910] [] ? do_mprotect_pkey+0x71d/0x890 [ 43.578283] [] ? mprotect_fixup+0x930/0x930 [ 43.584238] [] do_group_exit+0x111/0x340 [ 43.589942] [] ? do_group_exit+0x340/0x340 [ 43.595804] [] SyS_exit_group+0x1d/0x20 [ 43.601406] [] do_syscall_64+0x1a6/0x490 [ 43.607091] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 43.613988] 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 [ 43.641181] RIP [] page_remove_rmap+0x37/0x6d0 [ 43.647513] RSP [ 43.651114] CR2: ffffeafff8f28020 [ 43.654650] ---[ end trace aeeff4b22e3398a4 ]--- [ 43.659479] Kernel panic - not syncing: Fatal exception [ 43.665165] Dumping ftrace buffer: [ 43.668687] (ftrace buffer empty) [ 43.672377] Kernel Offset: disabled [ 43.675997] Rebooting in 86400 seconds..