[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.844662] 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: [ 28.014262] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.532004] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 29.078810] random: sshd: uninitialized urandom read (32 bytes read, 52 bits of entropy available) [ 29.274103] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) Warning: Permanently added '10.128.10.4' (ECDSA) to the list of known hosts. [ 34.922852] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) executing program [ 35.020534] BUG: unable to handle kernel paging request at ffffeafff8d80008 [ 35.028041] IP: [] page_remove_rmap+0x2e/0x260 [ 35.034600] PGD 0 [ 35.036872] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.042021] Dumping ftrace buffer: [ 35.045548] (ftrace buffer empty) [ 35.049246] Modules linked in: [ 35.052674] CPU: 1 PID: 3863 Comm: syz-executor229 Not tainted 4.4.148-gf057ff9 #81 [ 35.060453] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.070000] task: ffff8800bbb9b000 task.stack: ffff8801d9790000 [ 35.076055] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.084996] RSP: 0018:ffff8801d97979c0 EFLAGS: 00010246 [ 35.090542] RAX: dffffc0000000000 RBX: ffffeafff8d80000 RCX: 0000000000000000 [ 35.098024] RDX: 1ffffd5fff1b0001 RSI: ffffffff814bc75f RDI: ffffeafff8d80008 [ 35.105526] RBP: ffff8801d97979d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 35.112789] R10: 0000000000000001 R11: ffff8800bbb9b000 R12: 0000000000000001 [ 35.120051] R13: 1ffff1003b2f2f3e R14: ffff8801cc85a800 R15: ffffeafff8d80000 [ 35.127322] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.135537] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.141405] CR2: ffffeafff8d80008 CR3: 00000001d3b52000 CR4: 00000000001606f0 [ 35.148807] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.156261] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.163646] Stack: [ 35.165781] ffff8801d9797c50 0000000000000001 ffff8801d9797a78 ffffffff8150a1f3 [ 35.173844] 00003ffe360001e0 00003ffe360001e0 0000000041b58ab3 ffffffff841ef82f [ 35.181887] ffffffff81509ff0 00000000000004f0 ffff8800b3f05ec8 ffff8801d9797a40 [ 35.190043] Call Trace: [ 35.192620] [] zap_huge_pmd+0x203/0x510 [ 35.198235] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.205135] [] unmap_single_vma+0xea3/0x1240 [ 35.211515] [] ? vm_normal_page+0x230/0x230 [ 35.217481] [] ? __put_single_page+0x60/0x60 [ 35.223524] [] unmap_vmas+0x81/0xd0 [ 35.228782] [] exit_mmap+0x1c9/0x3a0 [ 35.234129] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.240607] [] ? up_write+0x1a/0x60 [ 35.245865] [] mmput+0xf8/0x2d0 [ 35.250783] [] do_exit+0x8d8/0x26b0 [ 35.256042] [] ? file_map_prot_check+0x193/0x310 [ 35.262541] [] ? release_task.part.17+0x1200/0x1200 [ 35.269188] [] ? SyS_mprotect+0x41e/0x640 [ 35.274962] [] ? up_write+0x1a/0x60 [ 35.280211] [] ? SyS_mprotect+0x423/0x640 [ 35.286037] [] do_group_exit+0x111/0x330 [ 35.291727] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.298190] [] SyS_exit_group+0x1d/0x20 [ 35.303788] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.310335] 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 [ 35.337242] RIP [] page_remove_rmap+0x2e/0x260 [ 35.343574] RSP [ 35.347169] CR2: ffffeafff8d80008 [ 35.350595] ---[ end trace c5d27f0325a04dd6 ]--- [ 35.355325] Kernel panic - not syncing: Fatal exception [ 35.360962] Dumping ftrace buffer: [ 35.364478] (ftrace buffer empty) [ 35.369319] Kernel Offset: disabled [ 35.372920] Rebooting in 86400 seconds..