[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.565792] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.345301] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.744937] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.424104] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 27.582550] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.10.56' (ECDSA) to the list of known hosts. [ 33.353203] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 33.442529] BUG: unable to handle kernel paging request at ffffeafff8cf0008 [ 33.449863] IP: [] page_remove_rmap+0x2e/0x260 [ 33.456109] PGD 0 [ 33.458347] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.463312] Dumping ftrace buffer: [ 33.466831] (ftrace buffer empty) [ 33.470512] Modules linked in: [ 33.473827] CPU: 1 PID: 3839 Comm: syz-executor090 Not tainted 4.4.150-g5541782 #19 [ 33.481592] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.490921] task: ffff8801d2d4c800 task.stack: ffff8801d8d40000 [ 33.496949] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.505625] RSP: 0018:ffff8801d8d47948 EFLAGS: 00010246 [ 33.511044] RAX: dffffc0000000000 RBX: ffffeafff8cf0000 RCX: 0000000000000000 [ 33.518289] RDX: 1ffffd5fff19e001 RSI: ffffffff814bceaf RDI: ffffeafff8cf0008 [ 33.525535] RBP: ffff8801d8d47958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.532780] R10: 0000000000000001 R11: ffff8801d2d4c800 R12: 0000000000000001 [ 33.540022] R13: 1ffff1003b1a8f2f R14: ffff8801d1d3d800 R15: ffffeafff8cf0000 [ 33.547269] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.555467] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.561325] CR2: ffffeafff8cf0008 CR3: 00000001cecd1000 CR4: 00000000001606f0 [ 33.568567] Stack: [ 33.570690] ffff8801d8d47bd8 0000000000000001 ffff8801d8d47a00 ffffffff8150ad13 [ 33.578720] 00003ffe33c001e0 00003ffe33c001e0 0000000041b58ab3 ffffffff841ef837 [ 33.586701] ffffffff8150ab10 00000000000004f0 ffff8801d9843420 ffff8801d8d479c8 [ 33.594703] Call Trace: [ 33.597287] [] zap_huge_pmd+0x203/0x510 [ 33.602910] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.609464] [] unmap_single_vma+0xea3/0x1240 [ 33.615496] [] ? vm_normal_page+0x280/0x280 [ 33.621444] [] ? __put_single_page+0x60/0x60 [ 33.627475] [] unmap_vmas+0x81/0xd0 [ 33.632728] [] exit_mmap+0x1c9/0x3a0 [ 33.638069] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.644539] [] ? up_write+0x1a/0x60 [ 33.649796] [] mmput+0xf8/0x2d0 [ 33.654708] [] do_exit+0x8d8/0x26b0 [ 33.659964] [] ? file_map_prot_check+0x193/0x310 [ 33.666348] [] ? release_task.part.17+0x1200/0x1200 [ 33.672993] [] ? SyS_mprotect+0x41e/0x640 [ 33.678771] [] ? up_write+0x1a/0x60 [ 33.684048] [] ? SyS_mprotect+0x423/0x640 [ 33.689823] [] do_group_exit+0x111/0x330 [ 33.695508] [] ? do_group_exit+0x330/0x330 [ 33.701367] [] SyS_exit_group+0x1d/0x20 [ 33.706966] [] do_fast_syscall_32+0x324/0x8b0 [ 33.713087] [] sysenter_flags_fixed+0xd/0x1a [ 33.719112] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 33.745840] RIP [] page_remove_rmap+0x2e/0x260 [ 33.752166] RSP [ 33.755762] CR2: ffffeafff8cf0008 [ 33.759187] ---[ end trace c1dad8fee39b3b8c ]--- [ 33.763918] Kernel panic - not syncing: Fatal exception [ 33.769547] Dumping ftrace buffer: [ 33.773067] (ftrace buffer empty) [ 33.776750] Kernel Offset: disabled [ 33.780353] Rebooting in 86400 seconds..