[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.765270] 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: [ 24.660160] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.105876] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.853353] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 26.034454] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. [ 31.717703] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 31.806155] BUG: unable to handle kernel paging request at ffffeafff8cd8008 [ 31.813602] IP: [] page_remove_rmap+0x2e/0x260 [ 31.819845] PGD 0 [ 31.822086] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.827031] Dumping ftrace buffer: [ 31.830546] (ftrace buffer empty) [ 31.834229] Modules linked in: [ 31.837514] CPU: 0 PID: 3831 Comm: syz-executor737 Not tainted 4.4.150-g5541782 #19 [ 31.845276] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.854605] task: ffff8800bba91800 task.stack: ffff8801d8c48000 [ 31.860634] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.869303] RSP: 0018:ffff8801d8c4f948 EFLAGS: 00010246 [ 31.874722] RAX: dffffc0000000000 RBX: ffffeafff8cd8000 RCX: 0000000000000000 [ 31.881965] RDX: 1ffffd5fff19b001 RSI: ffffffff814bceaf RDI: ffffeafff8cd8008 [ 31.889207] RBP: ffff8801d8c4f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.896450] R10: 0000000000000001 R11: ffff8800bba91800 R12: 0000000000000001 [ 31.903699] R13: 1ffff1003b189f2f R14: ffff8801cf28e800 R15: ffffeafff8cd8000 [ 31.910942] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.919141] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.924995] CR2: ffffeafff8cd8008 CR3: 00000001c9102000 CR4: 00000000001606f0 [ 31.932239] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.939483] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.946721] Stack: [ 31.948840] ffff8801d8c4fbd8 0000000000000001 ffff8801d8c4fa00 ffffffff8150ad13 [ 31.956817] 00003ffe336001e0 00003ffe336001e0 0000000041b58ab3 ffffffff841ef837 [ 31.964806] ffffffff8150ab10 00000000000004f0 ffff8800b539dec8 ffff8801d8c4f9c8 [ 31.972798] Call Trace: [ 31.975369] [] zap_huge_pmd+0x203/0x510 [ 31.980971] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.987521] [] unmap_single_vma+0xea3/0x1240 [ 31.993581] [] ? vm_normal_page+0x280/0x280 [ 31.999523] [] ? __put_single_page+0x60/0x60 [ 32.005553] [] unmap_vmas+0x81/0xd0 [ 32.010811] [] exit_mmap+0x1c9/0x3a0 [ 32.016146] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.022613] [] ? up_write+0x1a/0x60 [ 32.027862] [] mmput+0xf8/0x2d0 [ 32.032781] [] do_exit+0x8d8/0x26b0 [ 32.038035] [] ? file_map_prot_check+0x193/0x310 [ 32.044412] [] ? release_task.part.17+0x1200/0x1200 [ 32.051048] [] ? SyS_mprotect+0x41e/0x640 [ 32.056906] [] ? up_write+0x1a/0x60 [ 32.062157] [] ? SyS_mprotect+0x423/0x640 [ 32.067924] [] do_group_exit+0x111/0x330 [ 32.073604] [] ? do_group_exit+0x330/0x330 [ 32.079460] [] SyS_exit_group+0x1d/0x20 [ 32.085064] [] do_fast_syscall_32+0x324/0x8b0 [ 32.091181] [] sysenter_flags_fixed+0xd/0x1a [ 32.097223] 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 [ 32.124002] RIP [] page_remove_rmap+0x2e/0x260 [ 32.130327] RSP [ 32.133922] CR2: ffffeafff8cd8008 [ 32.137346] ---[ end trace bc2224b1c2749e1c ]--- [ 32.142070] Kernel panic - not syncing: Fatal exception [ 32.147769] Dumping ftrace buffer: [ 32.151284] (ftrace buffer empty) [ 32.154982] Kernel Offset: disabled [ 32.158582] Rebooting in 86400 seconds..