[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.053483] 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: [ 26.900899] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.385011] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.001103] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) [ 69.732077] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. [ 75.314249] random: sshd: uninitialized urandom read (32 bytes read, 82 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 [ 75.587049] BUG: unable to handle kernel paging request at ffffeafff8c20008 [ 75.594455] IP: [] page_remove_rmap+0x2e/0x260 [ 75.600743] PGD 0 [ 75.603020] Oops: 0000 [#1] PREEMPT SMP KASAN [ 75.608040] Dumping ftrace buffer: [ 75.611569] (ftrace buffer empty) [ 75.615270] Modules linked in: [ 75.618589] CPU: 1 PID: 3994 Comm: syz-executor745 Not tainted 4.4.148-gf057ff9 #81 [ 75.626372] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 [ 75.635720] task: ffff8800ad7f1800 task.stack: ffff8800bb110000 [ 75.641770] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 75.650488] RSP: 0018:ffff8800bb117720 EFLAGS: 00010246 [ 75.655929] RAX: dffffc0000000000 RBX: ffffeafff8c20000 RCX: 0000000000000000 [ 75.663192] RDX: 1ffffd5fff184001 RSI: ffffffff814bc75f RDI: ffffeafff8c20008 [ 75.670486] RBP: ffff8800bb117730 R08: ffffffff85333170 R09: 0000000000000000 [ 75.677761] R10: 0000000000000001 R11: ffff8800ad7f1800 R12: 0000000000000001 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 [ 75.685027] R13: 1ffff10017622eea R14: ffff8800b2bf8800 R15: ffffeafff8c20000 [ 75.692292] FS: 00007f00c8d77700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 75.700596] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 75.706471] CR2: ffffeafff8c20008 CR3: 00000001ce2c1000 CR4: 00000000001606f0 [ 75.713745] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 75.721007] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 75.728265] Stack: 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 [ 75.730405] ffff8800bb1179b0 0000000000000001 ffff8800bb1177d8 ffffffff8150a1f3 [ 75.738519] 00003ffe308001e0 00003ffe308001e0 0000000041b58ab3 ffffffff841ef82f [ 75.746614] ffffffff81509ff0 00000000000004f0 ffff8800b1a25058 ffff8800bb1177a0 [ 75.754720] Call Trace: [ 75.757314] [] zap_huge_pmd+0x203/0x510 [ 75.762933] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 75.769508] [] unmap_single_vma+0xea3/0x1240 [ 75.775557] [] ? vm_normal_page+0x230/0x230 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 [ 75.781525] [] ? debug_check_no_locks_freed+0x210/0x210 [ 75.788537] [] ? debug_check_no_locks_freed+0x210/0x210 [ 75.795545] [] unmap_vmas+0x81/0xd0 [ 75.800819] [] exit_mmap+0x1c9/0x3a0 [ 75.806180] [] ? SyS_remap_file_pages+0x870/0x870 [ 75.812675] [] ? up_write+0x1a/0x60 [ 75.817949] [] mmput+0xf8/0x2d0 [ 75.822873] [] do_exit+0x8d8/0x26b0 [ 75.828146] [] ? debug_check_no_locks_freed+0x210/0x210 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 [ 75.835153] [] ? release_task.part.17+0x1200/0x1200 [ 75.841815] [] ? recalc_sigpending+0x76/0xa0 [ 75.847865] [] do_group_exit+0x111/0x330 [ 75.853567] [] get_signal+0x4ec/0x14b0 [ 75.859099] [] do_signal+0x8b/0x1d30 [ 75.864471] [] ? setup_sigcontext+0x780/0x780 [ 75.870712] [] ? file_map_prot_check+0x193/0x310 [ 75.877151] [] ? SyS_futex+0x1f8/0x300 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 [ 75.882711] [] ? exit_to_usermode_loop+0xe4/0x160 [ 75.889201] [] exit_to_usermode_loop+0x11a/0x160 [ 75.895639] [] syscall_return_slowpath+0x1b5/0x1f0 [ 75.902215] [] int_ret_from_sys_call+0x25/0xa3 [ 75.908437] 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 executing program executing program executing program executing program executing program executing program executing program [ 75.936438] RIP [] page_remove_rmap+0x2e/0x260 [ 75.942803] RSP [ 75.946420] CR2: ffffeafff8c20008 [ 75.949869] ---[ end trace 01249dc78bab0ee0 ]--- [ 75.954621] Kernel panic - not syncing: Fatal exception [ 75.960344] Dumping ftrace buffer: [ 75.963863] (ftrace buffer empty) [ 75.967628] Kernel Offset: disabled [ 75.971237] Rebooting in 86400 seconds..