[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.964057] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.293627] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.565108] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.218431] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 33.558882] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 39.120596] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 39.301475] BUG: unable to handle kernel paging request at ffffeafff8ce8008 [ 39.308954] IP: [] page_remove_rmap+0x2e/0x260 [ 39.315211] PGD 0 [ 39.317452] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.322398] Dumping ftrace buffer: [ 39.325910] (ftrace buffer empty) [ 39.329603] Modules linked in: [ 39.332894] CPU: 0 PID: 3716 Comm: syz-executor002 Not tainted 4.4.148-gf057ff9 #81 [ 39.340662] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.349994] task: ffff8800b2ae8000 task.stack: ffff8801d4618000 [ 39.356027] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 39.364812] RSP: 0018:ffff8801d461f720 EFLAGS: 00010246 [ 39.370305] RAX: dffffc0000000000 RBX: ffffeafff8ce8000 RCX: ffffea0007300000 [ 39.377558] RDX: 1ffffd5fff19d001 RSI: ffffffff814bc75f RDI: ffffeafff8ce8008 [ 39.384808] RBP: ffff8801d461f730 R08: ffffffff85363fb0 R09: 0000000000000000 [ 39.392061] R10: 0000000000000001 R11: ffff8800b2ae8000 R12: 0000000000000001 [ 39.399310] R13: 1ffff1003a8c3eea R14: ffff8801cda79800 R15: ffffeafff8ce8000 [ 39.406558] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 39.414758] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.420617] CR2: ffffeafff8ce8008 CR3: 00000001cda86000 CR4: 00000000001606f0 [ 39.427918] Stack: [ 39.430049] ffff8801d461f9b0 0000000000000001 ffff8801d461f7d8 ffffffff8150a1f3 [ 39.438037] 00003ffe33a001e0 00003ffe33a001e0 0000000041b58ab3 ffffffff841ef82f [ 39.446066] ffffffff81509ff0 00000000000004f0 ffff8800b2f5d790 ffff8801d461f7a0 [ 39.454107] Call Trace: [ 39.456671] [] zap_huge_pmd+0x203/0x510 [ 39.462273] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 39.468830] [] unmap_single_vma+0xea3/0x1240 [ 39.474864] [] ? vm_normal_page+0x230/0x230 [ 39.480860] [] ? __put_single_page+0x60/0x60 [ 39.486916] [] unmap_vmas+0x81/0xd0 [ 39.492177] [] exit_mmap+0x1c9/0x3a0 [ 39.497527] [] ? SyS_remap_file_pages+0x870/0x870 [ 39.504000] [] ? up_write+0x1a/0x60 [ 39.509252] [] mmput+0xf8/0x2d0 [ 39.514158] [] do_exit+0x8d8/0x26b0 [ 39.519412] [] ? debug_check_no_locks_freed+0x210/0x210 [ 39.526451] [] ? release_task.part.17+0x1200/0x1200 [ 39.533109] [] ? __sb_end_write+0xc1/0x100 [ 39.538991] [] ? recalc_sigpending+0x76/0xa0 [ 39.545032] [] do_group_exit+0x111/0x330 [ 39.550725] [] get_signal+0x4ec/0x14b0 [ 39.556243] [] do_signal+0x8b/0x1d30 [ 39.561587] [] ? setup_sigcontext+0x780/0x780 [ 39.567720] [] ? __fsnotify_update_child_dentry_flags.part.2+0x300/0x300 [ 39.576203] [] ? selinux_file_permission+0x2f2/0x450 [ 39.582955] [] ? fsnotify+0x10c0/0x10c0 [ 39.588564] [] ? SyS_futex+0x1f8/0x300 [ 39.594080] [] ? exit_to_usermode_loop+0xe4/0x160 [ 39.600555] [] exit_to_usermode_loop+0x11a/0x160 [ 39.606948] [] syscall_return_slowpath+0x1b5/0x1f0 [ 39.613511] [] int_ret_from_sys_call+0x25/0xa3 [ 39.619793] 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 [ 39.646972] RIP [] page_remove_rmap+0x2e/0x260 [ 39.653319] RSP [ 39.656918] CR2: ffffeafff8ce8008 [ 39.660354] ---[ end trace 9f8376ae7e684a59 ]--- [ 39.665083] Kernel panic - not syncing: Fatal exception [ 39.670844] Dumping ftrace buffer: [ 39.674372] (ftrace buffer empty) [ 39.678058] Kernel Offset: disabled [ 39.681658] Rebooting in 86400 seconds..