[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.334870] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.762732] random: sshd: uninitialized urandom read (32 bytes read) [ 20.195965] random: sshd: uninitialized urandom read (32 bytes read) [ 20.687049] random: sshd: uninitialized urandom read (32 bytes read) [ 20.829116] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. [ 26.318534] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.398507] BUG: unable to handle kernel paging request at ffffeafff91a8020 [ 26.406036] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.412286] PGD 0 [ 26.414232] [ 26.415856] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.420323] Dumping ftrace buffer: [ 26.423840] (ftrace buffer empty) [ 26.427524] Modules linked in: [ 26.430809] CPU: 0 PID: 3799 Comm: syz-executor282 Not tainted 4.9.121-g681e57b #25 [ 26.438581] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.447956] task: ffff8801b7591800 task.stack: ffff8801b6b48000 [ 26.453994] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.462668] RSP: 0018:ffff8801b6b4f948 EFLAGS: 00010246 [ 26.468092] RAX: dffffc0000000000 RBX: ffffeafff91a8000 RCX: 0000000000000000 [ 26.475341] RDX: 1ffffd5fff235004 RSI: ffffffff814f5278 RDI: ffffeafff91a8000 [ 26.482590] RBP: ffff8801b6b4f970 R08: 0000000000033f20 R09: 0000000000000001 [ 26.489837] R10: ffff8801b7591800 R11: 0000000000000001 R12: ffff8801b6b4fc08 [ 26.497085] R13: ffffeafff91a8020 R14: ffffeafff91a8000 R15: 0000000000000001 [ 26.504335] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.512605] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.518470] CR2: ffffeafff91a8020 CR3: 00000001c44c1000 CR4: 00000000001606f0 [ 26.525719] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.532965] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.540211] Stack: [ 26.542339] ffffeafff91a8020 ffff8801b6b4fc08 ffff8801c8663800 ffffeafff91a8000 [ 26.550320] ffff8801b81a6b00 ffff8801b6b4f9c8 ffffffff8154c20f ffff8801b6b4fc18 [ 26.558407] ffff8801b6b4fc10 ffff8801b6b4fc88 00003ffe46a001e0 00000001c8663000 [ 26.566481] Call Trace: [ 26.569049] [] zap_huge_pmd+0x16f/0x860 [ 26.574656] [] unmap_page_range+0x12ad/0x1730 [ 26.580776] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 26.587068] [] unmap_single_vma+0x101/0x260 [ 26.593020] [] unmap_vmas+0x102/0x1d0 [ 26.598447] [] exit_mmap+0x214/0x3f0 [ 26.603789] [] ? SyS_munmap+0xa0/0xa0 [ 26.609216] [] ? up_write+0x1a/0x60 [ 26.614577] [] mmput+0xf3/0x2d0 [ 26.619483] [] do_exit+0x906/0x27b0 [ 26.624734] [] ? release_task.part.19+0x1210/0x1210 [ 26.631416] [] ? up_write+0x1a/0x60 [ 26.636683] [] ? do_mprotect_pkey+0x71d/0x890 [ 26.642939] [] ? mprotect_fixup+0x930/0x930 [ 26.648888] [] do_group_exit+0x111/0x340 [ 26.654573] [] ? do_group_exit+0x340/0x340 [ 26.660433] [] SyS_exit_group+0x1d/0x20 [ 26.666037] [] do_syscall_64+0x1a6/0x490 [ 26.671725] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.678619] 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 [ 26.705419] RIP [] page_remove_rmap+0x37/0x6d0 [ 26.711757] RSP [ 26.715352] CR2: ffffeafff91a8020 [ 26.718779] ---[ end trace 987d2f25231dec8a ]--- [ 26.723577] Kernel panic - not syncing: Fatal exception [ 26.729267] Dumping ftrace buffer: [ 26.732786] (ftrace buffer empty) [ 26.736471] Kernel Offset: disabled [ 26.740076] Rebooting in 86400 seconds..