[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.050947] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.377532] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.704672] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.290093] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 28.281534] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.10.48' (ECDSA) to the list of known hosts. [ 33.793751] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) executing program [ 33.882498] BUG: unable to handle kernel paging request at ffffeafff8c18008 [ 33.889859] IP: [<ffffffff814bc77e>] page_remove_rmap+0x2e/0x260 [ 33.896105] PGD 0 [ 33.898387] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.903348] Dumping ftrace buffer: [ 33.906873] (ftrace buffer empty) [ 33.910556] Modules linked in: [ 33.913840] CPU: 0 PID: 3764 Comm: syz-executor269 Not tainted 4.4.148-gf057ff9 #81 [ 33.921613] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.930946] task: ffff8801cc133000 task.stack: ffff8801cc050000 [ 33.936980] RIP: 0010:[<ffffffff814bc77e>] [<ffffffff814bc77e>] page_remove_rmap+0x2e/0x260 [ 33.945677] RSP: 0018:ffff8801cc0579c0 EFLAGS: 00010246 [ 33.951117] RAX: dffffc0000000000 RBX: ffffeafff8c18000 RCX: 0000000000000000 [ 33.958396] RDX: 1ffffd5fff183001 RSI: ffffffff814bc75f RDI: ffffeafff8c18008 [ 33.965646] RBP: ffff8801cc0579d0 R08: ffffffff85333170 R09: 0000000000000000 [ 33.972895] R10: 0000000000000001 R11: ffff8801cc133000 R12: 0000000000000001 [ 33.980141] R13: 1ffff1003980af3e R14: ffff8801d1967800 R15: ffffeafff8c18000 [ 33.987388] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.995588] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.001467] CR2: ffffeafff8c18008 CR3: 00000001cf656000 CR4: 00000000001606f0 [ 34.008713] Stack: [ 34.010834] ffff8801cc057c50 0000000000000001 ffff8801cc057a78 ffffffff8150a1f3 [ 34.018883] 00003ffe306001e0 00003ffe306001e0 0000000041b58ab3 ffffffff841ef82f [ 34.026881] ffffffff81509ff0 00000000000004f0 ffff8801cc0eed68 ffff8801cc057a40 [ 34.034878] Call Trace: [ 34.037441] [<ffffffff8150a1f3>] zap_huge_pmd+0x203/0x510 [ 34.043060] [<ffffffff81509ff0>] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.049622] [<ffffffff81498cc3>] unmap_single_vma+0xea3/0x1240 [ 34.055657] [<ffffffff81497e20>] ? vm_normal_page+0x230/0x230 [ 34.061624] [<ffffffff81446c20>] ? __put_single_page+0x60/0x60 [ 34.067655] [<ffffffff8149ab91>] unmap_vmas+0x81/0xd0 [ 34.072911] [<ffffffff814b34a9>] exit_mmap+0x1c9/0x3a0 [ 34.078249] [<ffffffff814b32e0>] ? SyS_remap_file_pages+0x870/0x870 [ 34.084717] [<ffffffff8122853a>] ? up_write+0x1a/0x60 [ 34.089973] [<ffffffff81127e58>] mmput+0xf8/0x2d0 [ 34.094891] [<ffffffff81137ae8>] do_exit+0x8d8/0x26b0 [ 34.100161] [<ffffffff81c68453>] ? file_map_prot_check+0x193/0x310 [ 34.106543] [<ffffffff81137210>] ? release_task.part.17+0x1200/0x1200 [ 34.113195] [<ffffffff814b6e6e>] ? SyS_mprotect+0x41e/0x640 [ 34.118979] [<ffffffff8122853a>] ? up_write+0x1a/0x60 [ 34.124287] [<ffffffff814b6e73>] ? SyS_mprotect+0x423/0x640 [ 34.130062] [<ffffffff8113db31>] do_group_exit+0x111/0x330 [ 34.135746] [<ffffffff81003044>] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.142212] [<ffffffff8113dd6d>] SyS_exit_group+0x1d/0x20 [ 34.147814] [<ffffffff838ca6a5>] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.154364] 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 <f6> 43 08 01 0f 84 4e 01 00 00 e8 b3 77 e9 ff f0 83 43 18 ff 78 [ 34.181364] RIP [<ffffffff814bc77e>] page_remove_rmap+0x2e/0x260 [ 34.187702] RSP <ffff8801cc0579c0> [ 34.191299] CR2: ffffeafff8c18008 [ 34.194738] ---[ end trace 20d047c213d412fe ]--- [ 34.199485] Kernel panic - not syncing: Fatal exception [ 34.205177] Dumping ftrace buffer: [ 34.208705] (ftrace buffer empty) [ 34.212390] Kernel Offset: disabled [ 34.215993] Rebooting in 86400 seconds..