[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.776890] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.704133] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.174452] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.890113] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 28.082390] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. [ 33.584810] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 33.688536] BUG: unable to handle kernel paging request at ffffeafff8c90008 [ 33.695909] IP: [] page_remove_rmap+0x2e/0x260 [ 33.702187] PGD 0 [ 33.704430] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.709420] Dumping ftrace buffer: [ 33.712963] (ftrace buffer empty) [ 33.716663] Modules linked in: [ 33.719950] CPU: 0 PID: 3837 Comm: syz-executor954 Not tainted 4.4.148-gf057ff9 #81 [ 33.727721] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.737050] task: ffff8801d92d8000 task.stack: ffff8801d9180000 [ 33.743082] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.751770] RSP: 0018:ffff8801d91879c0 EFLAGS: 00010246 [ 33.757202] RAX: dffffc0000000000 RBX: ffffeafff8c90000 RCX: 0000000000000000 [ 33.764457] RDX: 1ffffd5fff192001 RSI: ffffffff814bc75f RDI: ffffeafff8c90008 [ 33.771698] RBP: ffff8801d91879d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.778964] R10: 0000000000000001 R11: ffff8801d92d8000 R12: 0000000000000001 [ 33.786229] R13: 1ffff1003b230f3e R14: ffff8801cbd84800 R15: ffffeafff8c90000 [ 33.793494] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.801705] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.807563] CR2: ffffeafff8c90008 CR3: 00000001cbddc000 CR4: 00000000001606f0 [ 33.814815] Stack: [ 33.816946] ffff8801d9187c50 0000000000000001 ffff8801d9187a78 ffffffff8150a1f3 [ 33.824992] 00003ffe324001e0 00003ffe324001e0 0000000041b58ab3 ffffffff841ef82f [ 33.832997] ffffffff81509ff0 00000000000004f0 ffff8801cac3caa8 ffff8801d9187a40 [ 33.841039] Call Trace: [ 33.843619] [] zap_huge_pmd+0x203/0x510 [ 33.849227] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.855783] [] unmap_single_vma+0xea3/0x1240 [ 33.861846] [] ? vm_normal_page+0x230/0x230 [ 33.867805] [] ? __put_single_page+0x60/0x60 [ 33.873840] [] unmap_vmas+0x81/0xd0 [ 33.879091] [] exit_mmap+0x1c9/0x3a0 [ 33.884429] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.890898] [] ? up_write+0x1a/0x60 [ 33.896157] [] mmput+0xf8/0x2d0 [ 33.901062] [] do_exit+0x8d8/0x26b0 [ 33.906319] [] ? file_map_prot_check+0x193/0x310 [ 33.912698] [] ? release_task.part.17+0x1200/0x1200 [ 33.919355] [] ? SyS_mprotect+0x41e/0x640 [ 33.925129] [] ? up_write+0x1a/0x60 [ 33.930389] [] ? SyS_mprotect+0x423/0x640 [ 33.936161] [] do_group_exit+0x111/0x330 [ 33.941846] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.948328] [] SyS_exit_group+0x1d/0x20 [ 33.953934] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.960487] 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 [ 33.987676] RIP [] page_remove_rmap+0x2e/0x260 [ 33.994005] RSP [ 33.997614] CR2: ffffeafff8c90008 [ 34.001039] ---[ end trace b30eba086fbdcdf6 ]--- [ 34.005781] Kernel panic - not syncing: Fatal exception [ 34.011682] Dumping ftrace buffer: [ 34.015203] (ftrace buffer empty) [ 34.018887] Kernel Offset: disabled [ 34.022489] Rebooting in 86400 seconds..