[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.456899] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.257103] random: sshd: uninitialized urandom read (32 bytes read) [ 18.656214] random: sshd: uninitialized urandom read (32 bytes read) [ 19.189573] random: sshd: uninitialized urandom read (32 bytes read) [ 19.656513] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts. [ 25.282550] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.358864] BUG: unable to handle kernel paging request at ffffeafff9180020 [ 25.366238] IP: [] page_remove_rmap+0x37/0x6d0 [ 25.372505] PGD 0 [ 25.374462] [ 25.376095] Oops: 0000 [#1] PREEMPT SMP KASAN [ 25.380577] Dumping ftrace buffer: [ 25.384100] (ftrace buffer empty) [ 25.387797] Modules linked in: [ 25.391109] CPU: 0 PID: 3794 Comm: syz-executor559 Not tainted 4.9.120-gf85543b #24 [ 25.399058] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.408400] task: ffff8801b9591800 task.stack: ffff8801b81d8000 [ 25.414548] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 25.423355] RSP: 0018:ffff8801b81df948 EFLAGS: 00010246 [ 25.428790] RAX: dffffc0000000000 RBX: ffffeafff9180000 RCX: 0000000000000000 [ 25.436046] RDX: 1ffffd5fff230004 RSI: ffffffff814f5128 RDI: ffffeafff9180000 [ 25.443300] RBP: ffff8801b81df970 R08: 0000000000033fe0 R09: 0000000000000001 [ 25.450556] R10: ffff8801b9591800 R11: 0000000000000001 R12: ffff8801b81dfc08 [ 25.457811] R13: ffffeafff9180020 R14: ffffeafff9180000 R15: 0000000000000001 [ 25.465073] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 25.473285] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.479153] CR2: ffffeafff9180020 CR3: 00000001c426d000 CR4: 00000000001606f0 [ 25.486412] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.493743] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.501001] Stack: [ 25.503134] ffffeafff9180020 ffff8801b81dfc08 ffff8801b95fa800 ffffeafff9180000 [ 25.511181] ffff8801b74db948 ffff8801b81df9c8 ffffffff8154bfcf ffff8801b81dfc18 [ 25.519256] ffff8801b81dfc10 ffff8801b81dfc88 00003ffe460001e0 00000001b95fa000 [ 25.527350] Call Trace: [ 25.529927] [] zap_huge_pmd+0x16f/0x860 [ 25.535537] [] unmap_page_range+0x12ad/0x1730 [ 25.541667] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 25.547970] [] unmap_single_vma+0x101/0x260 [ 25.553926] [] unmap_vmas+0x102/0x1d0 [ 25.559361] [] exit_mmap+0x214/0x3f0 [ 25.564707] [] ? SyS_munmap+0xa0/0xa0 [ 25.570168] [] mmput+0xf3/0x2d0 [ 25.575084] [] do_exit+0x906/0x27b0 [ 25.580400] [] ? release_task.part.19+0x1210/0x1210 [ 25.587054] [] ? up_write+0x1a/0x60 [ 25.592331] [] ? do_mprotect_pkey+0x71d/0x890 [ 25.598477] [] ? mprotect_fixup+0x930/0x930 [ 25.604433] [] do_group_exit+0x111/0x340 [ 25.610131] [] ? do_group_exit+0x340/0x340 [ 25.616002] [] SyS_exit_group+0x1d/0x20 [ 25.621613] [] do_syscall_64+0x1a6/0x490 [ 25.627309] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.634215] 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 [ 25.662102] RIP [] page_remove_rmap+0x37/0x6d0 [ 25.668452] RSP [ 25.672060] CR2: ffffeafff9180020 [ 25.675500] ---[ end trace 42f45381567b275e ]--- [ 25.680243] Kernel panic - not syncing: Fatal exception [ 25.686114] Dumping ftrace buffer: [ 25.689653] (ftrace buffer empty) [ 25.693349] Kernel Offset: disabled [ 25.697048] Rebooting in 86400 seconds..