[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.046682] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.087469] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.437237] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.097036] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) [ 43.228528] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.0.17' (ECDSA) to the list of known hosts. [ 48.776568] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.276304] BUG: unable to handle kernel paging request at ffffeafffd3f8008 [ 49.283758] IP: [] page_remove_rmap+0x2e/0x260 [ 49.290042] PGD 0 [ 49.292614] Oops: 0000 [#1] PREEMPT SMP KASAN [ 49.297652] Dumping ftrace buffer: [ 49.301187] (ftrace buffer empty) [ 49.304896] Modules linked in: [ 49.308216] CPU: 1 PID: 4185 Comm: syz-executor115 Not tainted 4.4.148-gf057ff9 #81 [ 49.316001] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.325351] task: ffff8801da3f6000 task.stack: ffff8801d8de8000 [ 49.331399] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 49.340121] RSP: 0018:ffff8801d8def720 EFLAGS: 00010246 [ 49.345568] RAX: dffffc0000000000 RBX: ffffeafffd3f8000 RCX: 0000000000000000 [ 49.352846] RDX: 1ffffd5fffa7f001 RSI: ffffffff814bc75f RDI: ffffeafffd3f8008 [ 49.360114] RBP: ffff8801d8def730 R08: ffffffff85333170 R09: 0000000000000000 [ 49.367390] R10: 0000000000000001 R11: ffff8801da3f6000 R12: 0000000000000001 [ 49.374655] R13: 1ffff1003b1bdeea R14: ffff8801cb471800 R15: ffffeafffd3f8000 [ 49.381930] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 49.390159] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.396038] CR2: ffffeafffd3f8008 CR3: 00000001d8d4e000 CR4: 00000000001606f0 [ 49.403307] Stack: [ 49.405449] ffff8801d8def9b0 0000000000000001 ffff8801d8def7d8 ffffffff8150a1f3 [ 49.413508] 00003fff4fe001e0 00003fff4fe001e0 0000000041b58ab3 ffffffff841ef82f [ 49.421596] ffffffff81509ff0 00000000000004f0 ffff8801cb462b58 ffff8801d8def7a0 [ 49.429681] Call Trace: [ 49.432265] [] zap_huge_pmd+0x203/0x510 [ 49.437891] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 49.444471] [] unmap_single_vma+0xea3/0x1240 [ 49.450542] [] ? vm_normal_page+0x230/0x230 [ 49.456516] [] ? debug_check_no_locks_freed+0x210/0x210 [ 49.463526] [] ? debug_check_no_locks_freed+0x210/0x210 [ 49.470538] [] unmap_vmas+0x81/0xd0 [ 49.475816] [] exit_mmap+0x1c9/0x3a0 [ 49.481178] [] ? SyS_remap_file_pages+0x870/0x870 [ 49.487667] [] ? up_write+0x1a/0x60 [ 49.492940] [] mmput+0xf8/0x2d0 [ 49.497860] [] do_exit+0x8d8/0x26b0 [ 49.503136] [] ? debug_check_no_locks_freed+0x210/0x210 [ 49.510161] [] ? release_task.part.17+0x1200/0x1200 [ 49.516823] [] ? recalc_sigpending+0x76/0xa0 [ 49.522878] [] do_group_exit+0x111/0x330 [ 49.528584] [] get_signal+0x4ec/0x14b0 [ 49.534126] [] do_signal+0x8b/0x1d30 [ 49.539490] [] ? setup_sigcontext+0x780/0x780 [ 49.545639] [] ? file_map_prot_check+0x193/0x310 [ 49.552042] [] ? SyS_futex+0x1f8/0x300 [ 49.557575] [] ? exit_to_usermode_loop+0xe4/0x160 [ 49.564073] [] exit_to_usermode_loop+0x11a/0x160 [ 49.570475] [] syscall_return_slowpath+0x1b5/0x1f0 [ 49.577053] [] int_ret_from_sys_call+0x25/0xa3 [ 49.583270] 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 [ 49.611099] RIP [] page_remove_rmap+0x2e/0x260 [ 49.617466] RSP [ 49.621080] CR2: ffffeafffd3f8008 [ 49.624523] ---[ end trace bcce746190f6242c ]--- [ 49.629266] Kernel panic - not syncing: Fatal exception [ 49.634903] Dumping ftrace buffer: [ 49.638430] (ftrace buffer empty) [ 49.642178] Kernel Offset: disabled [ 49.645785] Rebooting in 86400 seconds..