[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.460687] 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: [ 21.834640] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.112170] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.785909] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 22.964130] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. [ 28.595143] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 28.689367] BUG: unable to handle kernel paging request at ffffeafff8d40008 [ 28.696721] IP: [] page_remove_rmap+0x2e/0x260 [ 28.702968] PGD 0 [ 28.705220] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.710173] Dumping ftrace buffer: [ 28.713683] (ftrace buffer empty) [ 28.717368] Modules linked in: [ 28.720654] CPU: 0 PID: 3790 Comm: syz-executor533 Not tainted 4.4.148-gf057ff9 #81 [ 28.728419] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.737761] task: ffff8801c9d61800 task.stack: ffff8801c9838000 [ 28.743804] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.752478] RSP: 0018:ffff8801c983f9c0 EFLAGS: 00010246 [ 28.757917] RAX: dffffc0000000000 RBX: ffffeafff8d40000 RCX: 0000000000000000 [ 28.765161] RDX: 1ffffd5fff1a8001 RSI: ffffffff814bc75f RDI: ffffeafff8d40008 [ 28.772406] RBP: ffff8801c983f9d0 R08: ffffffff85314df0 R09: 0000000000000000 [ 28.779650] R10: 0000000000000001 R11: ffff8801c9d61800 R12: 0000000000000001 [ 28.786899] R13: 1ffff10039307f3e R14: ffff8801d0d36800 R15: ffffeafff8d40000 [ 28.794141] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.802338] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.808224] CR2: ffffeafff8d40008 CR3: 00000001d2351000 CR4: 00000000001606f0 [ 28.815468] Stack: [ 28.817592] ffff8801c983fc50 0000000000000001 ffff8801c983fa78 ffffffff8150a1f3 [ 28.825566] 00003ffe350001e0 00003ffe350001e0 0000000041b58ab3 ffffffff841ef82f [ 28.833548] ffffffff81509ff0 00000000000004f0 ffff8801ca2fb790 ffff8801c983fa40 [ 28.841534] Call Trace: [ 28.844098] [] zap_huge_pmd+0x203/0x510 [ 28.849697] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.856254] [] unmap_single_vma+0xea3/0x1240 [ 28.862299] [] ? vm_normal_page+0x230/0x230 [ 28.868244] [] ? __put_single_page+0x60/0x60 [ 28.874273] [] unmap_vmas+0x81/0xd0 [ 28.879526] [] exit_mmap+0x1c9/0x3a0 [ 28.884868] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.891356] [] ? up_write+0x1a/0x60 [ 28.896608] [] mmput+0xf8/0x2d0 [ 28.901511] [] do_exit+0x8d8/0x26b0 [ 28.906779] [] ? file_map_prot_check+0x193/0x310 [ 28.913160] [] ? release_task.part.17+0x1200/0x1200 [ 28.919801] [] ? SyS_mprotect+0x41e/0x640 [ 28.925574] [] ? up_write+0x1a/0x60 [ 28.930827] [] ? SyS_mprotect+0x423/0x640 [ 28.936596] [] do_group_exit+0x111/0x330 [ 28.942281] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.948747] [] SyS_exit_group+0x1d/0x20 [ 28.954349] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.960899] 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 [ 28.987835] RIP [] page_remove_rmap+0x2e/0x260 [ 28.994162] RSP [ 28.997758] CR2: ffffeafff8d40008 [ 29.001186] ---[ end trace 981c722ca829c87e ]--- [ 29.005975] Kernel panic - not syncing: Fatal exception [ 29.011594] Dumping ftrace buffer: [ 29.015116] (ftrace buffer empty) [ 29.018802] Kernel Offset: disabled [ 29.022403] Rebooting in 86400 seconds..