[ 16.057845] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.490525] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.831440] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.610904] random: sshd: uninitialized urandom read (32 bytes read, 96 bits of entropy available) [ 23.478846] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) Warning: Permanently added '10.128.15.221' (ECDSA) to the list of known hosts. [ 28.927220] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 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 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 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 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 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 [ 30.475550] random: nonblocking pool is initialized 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 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 [ 30.938718] kasan: CONFIG_KASAN_INLINE enabled [ 30.943131] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.956053] Dumping ftrace buffer: [ 30.959557] (ftrace buffer empty) [ 30.963232] Modules linked in: [ 30.966498] CPU: 1 PID: 4007 Comm: syzkaller341086 Not tainted 4.4.111-g3301b55 #24 [ 30.974262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.983755] task: ffff8800b3268000 task.stack: ffff8800b3178000 [ 30.989775] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 30.998006] RSP: 0018:ffff8800b317f9f0 EFLAGS: 00010a07 [ 31.003419] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9ebb [ 31.010655] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 31.017891] RBP: ffff8800b317fa00 R08: 0000000000000001 R09: 0000000000000001 [ 31.025125] R10: 0000000000000000 R11: 1ffff1001662ff1c R12: 0000000000000004 [ 31.032570] R13: 0000000000000020 R14: ffff8801cf4a4200 R15: dffffc0000000000 [ 31.039805] FS: 0000000001669880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.047996] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.053841] CR2: 0000000020c34000 CR3: 00000000b31b6000 CR4: 0000000000160670 [ 31.061076] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.068311] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.075547] Stack: [ 31.077660] 0000000000000246 ffff8801cf4a4358 ffff8800b317fa60 ffffffff825b9ee1 [ 31.085602] ffff8801cf4a4370 ffffed0039e9486b ffffed0039e9486e ffff8801cf4a4368 [ 31.093542] dead4ead00000000 ffff8801cf4a4340 0000000000000000 0000000000000000 [ 31.101480] Call Trace: [ 31.104034] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 31.110488] [] sg_finish_rem_req+0x2b5/0x340 [ 31.116513] [] sg_new_read.isra.18+0x336/0x3c0 [ 31.122705] [] sg_read+0x8c2/0x1490 [ 31.127948] [] ? __check_object_size+0x154/0x35b [ 31.134317] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 31.140946] [] ? fsnotify+0xee0/0xee0 [ 31.146361] [] ? avc_policy_seqno+0x9/0x20 [ 31.152210] [] do_loop_readv_writev+0x141/0x1e0 [ 31.158498] [] ? security_file_permission+0x89/0x1e0 [ 31.165214] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 31.171843] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 31.178731] [] do_readv_writev+0x5dd/0x6e0 [ 31.184578] [] ? vfs_write+0x530/0x530 [ 31.190079] [] ? _raw_spin_unlock+0x2c/0x50 [ 31.196011] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 31.204200] [] ? handle_mm_fault+0x3f2/0x3190 [ 31.211443] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 31.218246] [] vfs_readv+0x78/0xb0 [ 31.223395] [] SyS_readv+0xd9/0x240 [ 31.228644] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 31.235191] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 31.241736] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 31.248278] Code: 96 a4 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 [ 31.276020] RIP [] __free_pages+0x21/0x90 [ 31.281898] RSP [ 31.285879] ---[ end trace 35fc7bd240bcdd0f ]--- [ 31.290607] Kernel panic - not syncing: Fatal exception [ 31.296711] Dumping ftrace buffer: [ 31.300223] (ftrace buffer empty) [ 31.303900] Kernel Offset: disabled [ 31.307492] Rebooting in 86400 seconds..