[....] Starting OpenBSD Secure Shell server: sshd[ 16.940078] 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: [ 21.234089] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.483847] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.444935] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) [ 22.633104] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) [ 22.753294] random: nonblocking pool is initialized Warning: Permanently added '10.128.15.226' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program [ 28.120248] IPVS: Creating netns size=2552 id=1 executing program executing program [ 28.166341] IPVS: Creating netns size=2552 id=2 [ 28.167959] kasan: CONFIG_KASAN_INLINE enabled [ 28.167966] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.167970] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.167975] Dumping ftrace buffer: [ 28.167978] (ftrace buffer empty) [ 28.167981] Modules linked in: [ 28.167988] CPU: 0 PID: 3327 Comm: syzkaller000974 Not tainted 4.4.111-gf851888 #23 [ 28.167991] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.167995] task: ffff8801cfc88000 task.stack: ffff8801cfd20000 [ 28.168011] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.168014] RSP: 0018:ffff8801cfd279f0 EFLAGS: 00010a07 [ 28.168018] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 28.168021] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 28.168025] RBP: ffff8801cfd27a00 R08: 0000000000000001 R09: 0000000000000000 [ 28.168028] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.168031] R13: 0000000000000020 R14: ffff8801d05e2100 R15: dffffc0000000000 [ 28.168036] FS: 00000000014a8880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.168040] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.168043] CR2: 0000000020bb7000 CR3: 00000001d4c26000 CR4: 0000000000160670 [ 28.168049] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.168052] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.168053] Stack: [ 28.168061] 0000000000000000 ffff8801d05e2258 ffff8801cfd27a60 ffffffff825b9ec1 [ 28.168068] ffff8801d05e2270 ffffed003a0bc44b ffffed003a0bc44e ffff8801d05e2268 [ 28.168074] dead4ead00000000 ffff8801d05e2240 0000000000000000 0000000000000000 [ 28.168076] Call Trace: [ 28.168086] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.168092] [] sg_finish_rem_req+0x2b5/0x340 [ 28.168099] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.168106] [] ? sg_get_rq_mark+0x142/0x190 [ 28.168112] [] sg_read+0x8c2/0x1490 [ 28.168120] [] ? __check_object_size+0x154/0x35b [ 28.168127] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.168133] [] ? fsnotify+0xee0/0xee0 [ 28.168142] [] ? avc_policy_seqno+0x9/0x20 [ 28.168149] [] do_loop_readv_writev+0x141/0x1e0 [ 28.168156] [] ? security_file_permission+0x89/0x1e0 [ 28.168162] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.168169] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.168176] [] do_readv_writev+0x5dd/0x6e0 [ 28.168182] [] ? vfs_write+0x530/0x530 [ 28.168189] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.168195] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.168202] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.168209] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.168215] [] ? __fsnotify_parent+0xbc/0x340 [ 28.168221] [] ? avc_policy_seqno+0x9/0x20 [ 28.168226] [] ? fsnotify+0x5ad/0xee0 [ 28.168232] [] vfs_readv+0x78/0xb0 [ 28.168238] [] SyS_readv+0xd9/0x240 [ 28.168243] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.168250] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.168257] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.168341] 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 [ 28.168347] RIP [] __free_pages+0x21/0x90 [ 28.168349] RSP [ 28.168354] ---[ end trace 62893b2671963cd2 ]--- [ 28.168358] Kernel panic - not syncing: Fatal exception [ 28.171053] Dumping ftrace buffer: [ 28.171055] (ftrace buffer empty) [ 28.171057] Kernel Offset: disabled [ 28.549334] Rebooting in 86400 seconds..