[ 15.833949] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.345919] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 19.674132] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 20.555853] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) [ 23.306266] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. [ 28.672004] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) executing program [ 28.775176] kasan: CONFIG_KASAN_INLINE enabled [ 28.779928] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.792745] Dumping ftrace buffer: [ 28.796251] (ftrace buffer empty) [ 28.799961] Modules linked in: [ 28.803237] CPU: 0 PID: 3308 Comm: syzkaller127670 Not tainted 4.4.112-gd96d95d #31 [ 28.810997] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.820326] task: ffff8801d20baf80 task.stack: ffff8800b4b38000 [ 28.826347] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.834591] RSP: 0018:ffff8800b4b3f9f0 EFLAGS: 00010a07 [ 28.840006] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825ba47b [ 28.847242] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.854478] RBP: ffff8800b4b3fa00 R08: 0000000000000001 R09: 0000000000000000 [ 28.861713] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.868955] R13: 0000000000000020 R14: ffff8800b51a8000 R15: dffffc0000000000 [ 28.876200] FS: 0000000001efd880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.884393] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.890241] CR2: 0000000020ef0fe0 CR3: 00000000b5f28000 CR4: 0000000000160670 [ 28.897481] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.904719] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.911955] Stack: [ 28.914070] 0000000000000000 ffff8800b51a8158 ffff8800b4b3fa60 ffffffff825ba4a1 [ 28.922031] ffff8800b51a8170 ffffed0016a3502b ffffed0016a3502e ffff8800b51a8168 [ 28.929990] dead4ead00000000 ffff8800b51a8140 0000000000000000 0000000000000000 [ 28.937951] Call Trace: [ 28.940509] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.946967] [] sg_finish_rem_req+0x2b5/0x340 [ 28.952991] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.959102] [] ? sg_get_rq_mark+0x142/0x190 [ 28.965047] [] sg_read+0x8c2/0x1490 [ 28.970293] [] ? __check_object_size+0x154/0x35b [ 28.976667] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.983303] [] ? fsnotify+0xee0/0xee0 [ 28.988723] [] ? avc_policy_seqno+0x9/0x20 [ 28.994575] [] do_loop_readv_writev+0x141/0x1e0 [ 29.000860] [] ? security_file_permission+0x89/0x1e0 [ 29.007586] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.014217] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.020851] [] do_readv_writev+0x5dd/0x6e0 [ 29.026703] [] ? vfs_write+0x530/0x530 [ 29.032210] [] ? handle_mm_fault+0xbf5/0x3190 [ 29.038324] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.044261] [] ? handle_mm_fault+0x3f2/0x3190 [ 29.050383] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 29.057189] [] ? __fsnotify_parent+0xbc/0x340 [ 29.063304] [] ? avc_policy_seqno+0x9/0x20 [ 29.069155] [] vfs_readv+0x78/0xb0 [ 29.074310] [] SyS_readv+0xd9/0x240 [ 29.079554] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 29.086100] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 29.092644] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.099187] Code: 26 a6 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 29.125648] RIP [] __free_pages+0x21/0x90 [ 29.131532] RSP [ 29.135406] ---[ end trace 47ed4211ffaced85 ]--- [ 29.140853] Kernel panic - not syncing: Fatal exception [ 29.146606] Dumping ftrace buffer: [ 29.150117] (ftrace buffer empty) [ 29.153882] Kernel Offset: disabled [ 29.157475] Rebooting in 86400 seconds..