[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.236721] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.577801] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.888907] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.617959] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 25.779775] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 31.439408] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 31.527515] BUG: unable to handle kernel paging request at ffffeafffd408008 [ 31.534885] IP: [] page_remove_rmap+0x2e/0x260 [ 31.541130] PGD 0 [ 31.543370] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.548335] Dumping ftrace buffer: [ 31.551847] (ftrace buffer empty) [ 31.555541] Modules linked in: [ 31.558822] CPU: 0 PID: 3727 Comm: syz-executor960 Not tainted 4.4.149-gf76bdbd #18 [ 31.566585] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.575910] task: ffff8801cdd30000 task.stack: ffff8800b2880000 [ 31.581938] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.590605] RSP: 0018:ffff8800b2887948 EFLAGS: 00010246 [ 31.596026] RAX: dffffc0000000000 RBX: ffffeafffd408000 RCX: 0000000000000000 [ 31.603279] RDX: 1ffffd5fffa81001 RSI: ffffffff814bc8bf RDI: ffffeafffd408008 [ 31.610535] RBP: ffff8800b2887958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.617775] R10: 0000000000000001 R11: ffff8801cdd30000 R12: 0000000000000001 [ 31.625017] R13: 1ffff10016510f2f R14: ffff8800b1f97800 R15: ffffeafffd408000 [ 31.632261] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.640458] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.646314] CR2: ffffeafffd408008 CR3: 00000000b1813000 CR4: 00000000001606f0 [ 31.653556] Stack: [ 31.655686] ffff8800b2887bd8 0000000000000001 ffff8800b2887a00 ffffffff8150a443 [ 31.663656] 00003fff502001e0 00003fff502001e0 0000000041b58ab3 ffffffff841ef837 [ 31.671633] ffffffff8150a240 00000000000004f0 ffff8801cd378790 ffff8800b28879c8 [ 31.679604] Call Trace: [ 31.682162] [] zap_huge_pmd+0x203/0x510 [ 31.687758] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.694310] [] unmap_single_vma+0xea3/0x1240 [ 31.700344] [] ? vm_normal_page+0x230/0x230 [ 31.706294] [] ? __put_single_page+0x60/0x60 [ 31.712322] [] unmap_vmas+0x81/0xd0 [ 31.717608] [] exit_mmap+0x1c9/0x3a0 [ 31.722960] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.729431] [] ? up_write+0x1a/0x60 [ 31.734684] [] mmput+0xf8/0x2d0 [ 31.739586] [] do_exit+0x8d8/0x26b0 [ 31.744860] [] ? handle_mm_fault+0x1a49/0x31e0 [ 31.751066] [] ? release_task.part.17+0x1200/0x1200 [ 31.757727] [] do_group_exit+0x111/0x330 [ 31.763420] [] ? do_group_exit+0x330/0x330 [ 31.769279] [] SyS_exit_group+0x1d/0x20 [ 31.774877] [] do_fast_syscall_32+0x324/0x8b0 [ 31.780997] [] sysenter_flags_fixed+0xd/0x1a [ 31.787035] Code: e5 41 54 53 48 89 fb e8 e1 77 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 b3 77 e9 ff f0 83 43 18 ff 78 [ 31.813835] RIP [] page_remove_rmap+0x2e/0x260 [ 31.820162] RSP [ 31.823755] CR2: ffffeafffd408008 [ 31.827179] ---[ end trace 0b0f7790eed26cc4 ]--- [ 31.831908] Kernel panic - not syncing: Fatal exception [ 31.837547] Dumping ftrace buffer: [ 31.841064] (ftrace buffer empty) [ 31.844745] Kernel Offset: disabled [ 31.848343] Rebooting in 86400 seconds..