[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.417350] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.392002] random: sshd: uninitialized urandom read (32 bytes read) [ 18.809218] random: sshd: uninitialized urandom read (32 bytes read) [ 19.310160] random: sshd: uninitialized urandom read (32 bytes read) [ 23.910847] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts. [ 29.574346] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.741005] BUG: unable to handle kernel paging request at ffffeafff8f60020 [ 29.748479] IP: [] page_remove_rmap+0x37/0x6d0 [ 29.754744] PGD 0 [ 29.756699] [ 29.758331] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.762809] Dumping ftrace buffer: [ 29.766328] (ftrace buffer empty) [ 29.770018] Modules linked in: [ 29.773317] CPU: 0 PID: 3775 Comm: syz-executor045 Not tainted 4.9.120-gf85543b #24 [ 29.781205] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.790544] task: ffff8801bc648000 task.stack: ffff8801ba6a8000 [ 29.796579] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.805420] RSP: 0018:ffff8801ba6af6c0 EFLAGS: 00010246 [ 29.811084] RAX: dffffc0000000000 RBX: ffffeafff8f60000 RCX: ffffea0007050000 [ 29.818499] RDX: 1ffffd5fff1ec004 RSI: ffffffff814f5128 RDI: ffffeafff8f60000 [ 29.825759] RBP: ffff8801ba6af6e8 R08: 0000000000034aa0 R09: 0000000000000001 [ 29.833134] R10: ffff8801bc648000 R11: 0000000000000001 R12: ffff8801ba6af980 [ 29.840506] R13: ffffeafff8f60020 R14: ffffeafff8f60000 R15: 0000000000000001 [ 29.847765] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.856091] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.861958] CR2: ffffeafff8f60020 CR3: 00000001c01a6000 CR4: 00000000001606f0 [ 29.869418] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.876677] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.883928] Stack: [ 29.886195] ffffeafff8f60020 ffff8801ba6af980 ffff8801bf0d7800 ffffeafff8f60000 [ 29.894228] ffff8801c23a47e8 ffff8801ba6af740 ffffffff8154bfcf ffff8801ba6af990 [ 29.902497] ffff8801ba6af988 ffff8801ba6afa00 00003ffe3d8001e0 00000001bf0d7000 [ 29.910528] Call Trace: [ 29.913118] [] zap_huge_pmd+0x16f/0x860 [ 29.918725] [] unmap_page_range+0x12ad/0x1730 [ 29.924865] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 29.931165] [] unmap_single_vma+0x101/0x260 [ 29.937117] [] unmap_vmas+0x102/0x1d0 [ 29.942549] [] exit_mmap+0x214/0x3f0 [ 29.947891] [] ? SyS_munmap+0xa0/0xa0 [ 29.953558] [] ? up_write+0x1a/0x60 [ 29.958821] [] mmput+0xf3/0x2d0 [ 29.963734] [] do_exit+0x906/0x27b0 [ 29.968991] [] ? debug_check_no_locks_freed+0x210/0x210 [ 29.975991] [] ? get_futex_key+0x1090/0x1090 [ 29.982034] [] ? change_protection+0xf0/0x1280 [ 29.988247] [] ? release_task.part.19+0x1210/0x1210 [ 29.994897] [] ? recalc_sigpending+0x72/0x90 [ 30.000941] [] do_group_exit+0x111/0x340 [ 30.006637] [] get_signal+0x4cf/0x1450 [ 30.012304] [] ? mprotect_fixup+0x437/0x930 [ 30.018268] [] do_signal+0x87/0x19f0 [ 30.023621] [] ? setup_sigcontext+0x7d0/0x7d0 [ 30.029862] [] ? do_mprotect_pkey+0x70c/0x890 [ 30.036068] [] ? do_futex+0x17c0/0x17c0 [ 30.041699] [] ? mprotect_fixup+0x930/0x930 [ 30.047666] [] ? exit_to_usermode_loop+0xac/0x120 [ 30.054146] [] exit_to_usermode_loop+0xe1/0x120 [ 30.060465] [] do_syscall_64+0x364/0x490 [ 30.066232] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 30.073144] Code: 55 41 54 53 48 89 fb e8 c8 b6 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 93 b6 e6 [ 30.100750] RIP [] page_remove_rmap+0x37/0x6d0 [ 30.107097] RSP [ 30.110702] CR2: ffffeafff8f60020 [ 30.114338] ---[ end trace 0cf5a268075558f2 ]--- [ 30.119078] Kernel panic - not syncing: Fatal exception [ 30.125135] Dumping ftrace buffer: [ 30.128662] (ftrace buffer empty) [ 30.132354] Kernel Offset: disabled [ 30.136065] Rebooting in 86400 seconds..