[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.495172] 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: [ 23.595445] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.923352] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 24.632291] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 24.804353] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 30.488098] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 30.580868] BUG: unable to handle kernel paging request at ffffeafffd390008 [ 30.588213] IP: [] page_remove_rmap+0x2e/0x260 [ 30.594477] PGD 0 [ 30.596721] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.601684] Dumping ftrace buffer: [ 30.605192] (ftrace buffer empty) [ 30.608894] Modules linked in: [ 30.612181] CPU: 0 PID: 3849 Comm: syz-executor777 Not tainted 4.4.150-g5541782 #83 [ 30.619946] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.629277] task: ffff8801c762e000 task.stack: ffff8800acf10000 [ 30.635312] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 30.643987] RSP: 0018:ffff8800acf179c0 EFLAGS: 00010246 [ 30.649409] RAX: dffffc0000000000 RBX: ffffeafffd390000 RCX: 0000000000000000 [ 30.656656] RDX: 1ffffd5fffa72001 RSI: ffffffff814bceaf RDI: ffffeafffd390008 [ 30.663899] RBP: ffff8800acf179d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 30.671157] R10: 0000000000000001 R11: ffff8801c762e000 R12: 0000000000000001 [ 30.678401] R13: 1ffff100159e2f3e R14: ffff8800b5f1e800 R15: ffffeafffd390000 [ 30.685664] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.693862] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.699715] CR2: ffffeafffd390008 CR3: 00000000af806000 CR4: 00000000001606f0 [ 30.707044] Stack: [ 30.709182] ffff8800acf17c50 0000000000000001 ffff8800acf17a78 ffffffff8150ad13 [ 30.717168] 00003fff4e4001e0 00003fff4e4001e0 0000000041b58ab3 ffffffff841ef837 [ 30.725152] ffffffff8150ab10 00000000000004f0 ffff8800bb840f78 ffff8800acf17a40 [ 30.733131] Call Trace: [ 30.735696] [] zap_huge_pmd+0x203/0x510 [ 30.741294] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.747850] [] unmap_single_vma+0xea3/0x1240 [ 30.753898] [] ? vm_normal_page+0x280/0x280 [ 30.759844] [] ? __put_single_page+0x60/0x60 [ 30.765872] [] unmap_vmas+0x81/0xd0 [ 30.771123] [] exit_mmap+0x1c9/0x3a0 [ 30.776479] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.782947] [] ? up_write+0x1a/0x60 [ 30.788227] [] mmput+0xf8/0x2d0 [ 30.793145] [] do_exit+0x8d8/0x26b0 [ 30.798413] [] ? file_map_prot_check+0x193/0x310 [ 30.804812] [] ? release_task.part.17+0x1200/0x1200 [ 30.811454] [] ? SyS_mprotect+0x41e/0x640 [ 30.817227] [] ? up_write+0x1a/0x60 [ 30.822475] [] ? SyS_mprotect+0x423/0x640 [ 30.828420] [] do_group_exit+0x111/0x330 [ 30.834122] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.840592] [] SyS_exit_group+0x1d/0x20 [ 30.846193] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 30.852739] 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 [ 30.879517] RIP [] page_remove_rmap+0x2e/0x260 [ 30.885842] RSP [ 30.889438] CR2: ffffeafffd390008 [ 30.892873] ---[ end trace a74143a467d463c7 ]--- [ 30.897603] Kernel panic - not syncing: Fatal exception [ 30.903308] Dumping ftrace buffer: [ 30.906828] (ftrace buffer empty) [ 30.910512] Kernel Offset: disabled [ 30.914110] Rebooting in 86400 seconds..