[ 16.172061] random: sshd: uninitialized urandom read (32 bytes read, 33 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: [ 20.122602] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.441093] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.281605] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) [ 33.387852] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) Warning: Permanently added '10.128.15.192' (ECDSA) to the list of known hosts. [ 38.779425] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) executing program [ 38.868624] kasan: CONFIG_KASAN_INLINE enabled [ 38.873558] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.886344] Dumping ftrace buffer: [ 38.889847] (ftrace buffer empty) [ 38.893523] Modules linked in: [ 38.896798] CPU: 1 PID: 3327 Comm: syzkaller297188 Not tainted 4.4.107-g610c835 #12 [ 38.904556] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.913877] task: ffff8801d0ebc740 task.stack: ffff8800b3d70000 [ 38.919900] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 38.928128] RSP: 0018:ffff8800b3d77ab0 EFLAGS: 00010a07 [ 38.933541] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 38.940787] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 38.948028] RBP: ffff8800b3d77ac0 R08: 0000000000000001 R09: 0000000000000000 [ 38.955266] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 38.962504] R13: 0000000000000020 R14: ffff8800b44c8000 R15: dffffc0000000000 [ 38.969744] FS: 0000000001619880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 38.977937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.983783] CR2: 000000000043e5a0 CR3: 00000000b8194000 CR4: 00000000001406e0 [ 38.991023] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.998260] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.005495] Stack: [ 39.007610] 0000000000000000 ffff8800b44c8158 ffff8800b3d77b20 ffffffff825b8cf1 [ 39.015556] ffff8800b44c8170 ffffed001689902b ffffed001689902e ffff8800b44c8168 [ 39.023504] dead4ead00000000 ffff8800b44c8140 0000000000000000 0000000000000000 [ 39.031452] Call Trace: [ 39.034009] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 39.040467] [] sg_finish_rem_req+0x2b5/0x340 [ 39.046491] [] sg_new_read.isra.18+0x39/0x3c0 [ 39.052600] [] ? sg_get_rq_mark+0x142/0x190 [ 39.058535] [] sg_read+0x8c2/0x1490 [ 39.063778] [] ? save_stack_trace+0x26/0x50 [ 39.069716] [] ? save_stack+0x43/0xd0 [ 39.075129] [] ? kasan_slab_free+0x72/0xc0 [ 39.080981] [] ? kmem_cache_free+0xc7/0x320 [ 39.086921] [] ? do_sys_open+0x23a/0x4b0 [ 39.092596] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 39.099230] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 39.106036] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 39.112930] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 39.119571] [] __vfs_read+0x103/0x440 [ 39.124988] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 39.131891] [] ? vfs_iter_write+0x2d0/0x2d0 [ 39.137833] [] ? fsnotify+0x5ad/0xee0 [ 39.143249] [] ? fsnotify+0xee0/0xee0 [ 39.148666] [] ? avc_policy_seqno+0x9/0x20 [ 39.154527] [] ? selinux_file_permission+0x348/0x460 [ 39.161246] [] ? security_file_permission+0x89/0x1e0 [ 39.167973] [] ? rw_verify_area+0x100/0x2f0 [ 39.173918] [] vfs_read+0x123/0x3a0 [ 39.179170] [] SyS_read+0xd9/0x1b0 [ 39.184328] [] ? do_sendfile+0xd30/0xd30 [ 39.190007] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 39.196469] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 39.203012] Code: 76 ae 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 [ 39.229340] RIP [] __free_pages+0x21/0x90 [ 39.235219] RSP [ 39.239115] ---[ end trace 820d4da57623c79c ]--- [ 39.244373] Kernel panic - not syncing: Fatal exception [ 39.250115] Dumping ftrace buffer: [ 39.253621] (ftrace buffer empty) [ 39.257301] Kernel Offset: disabled [ 39.260895] Rebooting in 86400 seconds..