[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.094446] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.380400] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.714640] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.637259] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) [ 22.817245] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. [ 28.207583] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.421500] random: nonblocking pool is initialized [ 28.425149] kasan: CONFIG_KASAN_INLINE enabled [ 28.425157] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.425161] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.425166] Dumping ftrace buffer: [ 28.425170] (ftrace buffer empty) [ 28.425173] Modules linked in: [ 28.425181] CPU: 1 PID: 3317 Comm: syzkaller565462 Not tainted 4.4.111-g7902639 #25 [ 28.425184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.425188] task: ffff8800b5bb5f00 task.stack: ffff8801d2a48000 [ 28.425202] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.425205] RSP: 0018:ffff8801d2a4f9f0 EFLAGS: 00010a07 [ 28.425209] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9ebb [ 28.425212] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.425216] RBP: ffff8801d2a4fa00 R08: 0000000000000001 R09: 0000000000000001 [ 28.425219] R10: 0000000000000000 R11: 1ffff1003a549f1c R12: 0000000000000004 [ 28.425222] R13: 0000000000000020 R14: ffff8800b5a20000 R15: dffffc0000000000 [ 28.425228] FS: 00000000018dd880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.425231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.425235] CR2: 0000000020dc8000 CR3: 00000001d1990000 CR4: 0000000000160670 [ 28.425241] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.425244] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.425245] Stack: [ 28.425253] ffffffff837764a9 ffff8800b5a20158 ffff8801d2a4fa60 ffffffff825b9ee1 [ 28.425260] ffff8800b5a20170 ffffed0016b4402b ffffed0016b4402e ffff8800b5a20168 [ 28.425267] dead4ead00000000 ffff8800b5a20140 0000000000000000 0000000000000000 [ 28.425269] Call Trace: [ 28.425277] [] ? retint_kernel+0x2d/0x2d [ 28.425287] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.425293] [] sg_finish_rem_req+0x2b5/0x340 [ 28.425300] [] sg_new_read.isra.18+0x336/0x3c0 [ 28.425307] [] sg_read+0x8c2/0x1490 [ 28.425314] [] ? __check_object_size+0x154/0x35b [ 28.425321] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.425327] [] ? fsnotify+0xee0/0xee0 [ 28.425335] [] ? avc_policy_seqno+0x9/0x20 [ 28.425342] [] do_loop_readv_writev+0x141/0x1e0 [ 28.425348] [] ? security_file_permission+0x89/0x1e0 [ 28.425355] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.425362] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.425368] [] do_readv_writev+0x5dd/0x6e0 [ 28.425374] [] ? vfs_write+0x530/0x530 [ 28.425380] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.425386] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.425393] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.425400] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.425406] [] ? __fsnotify_parent+0xbc/0x340 [ 28.425412] [] ? avc_policy_seqno+0x9/0x20 [ 28.425417] [] ? fsnotify+0x5ad/0xee0 [ 28.425424] [] vfs_readv+0x78/0xb0 [ 28.425429] [] SyS_readv+0xd9/0x240 [ 28.425435] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.425441] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.425447] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.425533] 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 [ 28.425539] RIP [] __free_pages+0x21/0x90 [ 28.425541] RSP [ 28.425546] ---[ end trace 555b768fa610ef67 ]--- [ 28.425550] Kernel panic - not syncing: Fatal exception [ 28.794295] Dumping ftrace buffer: [ 28.797817] (ftrace buffer empty) [ 28.801495] Kernel Offset: disabled [ 28.805088] Rebooting in 86400 seconds..