[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.489160] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.273403] random: sshd: uninitialized urandom read (32 bytes read) [ 27.719866] random: sshd: uninitialized urandom read (32 bytes read) [ 28.220063] random: sshd: uninitialized urandom read (32 bytes read) [ 28.355673] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.11' (ECDSA) to the list of known hosts. [ 33.851145] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.934887] BUG: unable to handle kernel paging request at ffffeafff9178020 [ 33.942245] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.948487] PGD 0 [ 33.950431] [ 33.952049] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.956515] Dumping ftrace buffer: [ 33.960022] (ftrace buffer empty) [ 33.963702] Modules linked in: [ 33.966983] CPU: 1 PID: 3804 Comm: syz-executor308 Not tainted 4.9.121-g681e57b #77 [ 33.974744] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.984253] task: ffff8801b7b23000 task.stack: ffff8801c9c78000 [ 33.990287] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.998961] RSP: 0018:ffff8801c9c7f948 EFLAGS: 00010246 [ 34.004381] RAX: dffffc0000000000 RBX: ffffeafff9178000 RCX: 0000000000000000 [ 34.011621] RDX: 1ffffd5fff22f004 RSI: ffffffff814f5278 RDI: ffffeafff9178000 [ 34.018862] RBP: ffff8801c9c7f970 R08: 0000000000033e00 R09: 0000000000000001 [ 34.026103] R10: ffff8801b7b23000 R11: 0000000000000001 R12: ffff8801c9c7fc08 [ 34.033355] R13: ffffeafff9178020 R14: ffffeafff9178000 R15: 0000000000000001 [ 34.040597] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.048918] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.054775] CR2: ffffeafff9178020 CR3: 00000001cb1c2000 CR4: 00000000001606f0 [ 34.062076] Stack: [ 34.064216] ffffeafff9178020 ffff8801c9c7fc08 ffff8801bc9df800 ffffeafff9178000 [ 34.072203] ffff8801b84d5688 ffff8801c9c7f9c8 ffffffff8154c20f ffff8801c9c7fc18 [ 34.080179] ffff8801c9c7fc10 ffff8801c9c7fc88 00003ffe45e001e0 00000001bc9df000 [ 34.088163] Call Trace: [ 34.090726] [] zap_huge_pmd+0x16f/0x860 [ 34.096326] [] unmap_page_range+0x12ad/0x1730 [ 34.102443] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 34.108733] [] unmap_single_vma+0x101/0x260 [ 34.114687] [] unmap_vmas+0x102/0x1d0 [ 34.120115] [] exit_mmap+0x214/0x3f0 [ 34.125448] [] ? SyS_munmap+0xa0/0xa0 [ 34.130870] [] ? up_write+0x1a/0x60 [ 34.136123] [] mmput+0xf3/0x2d0 [ 34.141030] [] do_exit+0x906/0x27b0 [ 34.146314] [] ? release_task.part.19+0x1210/0x1210 [ 34.152988] [] ? up_write+0x1a/0x60 [ 34.158234] [] ? do_mprotect_pkey+0x71d/0x890 [ 34.164349] [] ? mprotect_fixup+0x930/0x930 [ 34.170291] [] do_group_exit+0x111/0x340 [ 34.176072] [] ? do_group_exit+0x340/0x340 [ 34.181988] [] SyS_exit_group+0x1d/0x20 [ 34.187591] [] do_syscall_64+0x1a6/0x490 [ 34.193288] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.200194] 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 [ 34.227171] RIP [] page_remove_rmap+0x37/0x6d0 [ 34.233521] RSP [ 34.237114] CR2: ffffeafff9178020 [ 34.240540] ---[ end trace d7c9d92b61909928 ]--- [ 34.245271] Kernel panic - not syncing: Fatal exception [ 34.250922] Dumping ftrace buffer: [ 34.254435] (ftrace buffer empty) [ 34.258120] Kernel Offset: disabled [ 34.261721] Rebooting in 86400 seconds..