[ 15.624781] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.447404] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 20.804858] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.652505] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) [ 21.822459] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.15.196' (ECDSA) to the list of known hosts. [ 27.210068] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) executing program [ 27.310272] IPVS: Creating netns size=2552 id=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.331539] sg_write: data in/out 36090/16 bytes for SCSI command 0x67-- guessing data in; [ 27.331539] program syzkaller578766 not setting count and/or reply_len properly executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.936089] kasan: CONFIG_KASAN_INLINE enabled [ 27.940507] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.953650] Dumping ftrace buffer: [ 27.957154] (ftrace buffer empty) [ 27.960841] Modules linked in: [ 27.964113] CPU: 0 PID: 3484 Comm: syzkaller578766 Not tainted 4.4.110-gdac1439 #13 [ 27.971876] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.981196] task: ffff8801d0744740 task.stack: ffff8801d0780000 [ 27.987214] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.995438] RSP: 0018:ffff8801d0787970 EFLAGS: 00010a07 [ 28.000852] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 28.008087] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 28.015321] RBP: ffff8801d0787980 R08: 0000000000000001 R09: 0000000000000000 [ 28.022556] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.029789] R13: 0000000000000020 R14: ffff8801d07e8000 R15: dffffc0000000000 [ 28.037023] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009309840 [ 28.045213] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.051058] CR2: 0000000020bb7000 CR3: 00000001d52d6000 CR4: 0000000000160670 [ 28.058295] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.065528] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.072762] Stack: [ 28.074880] 0000000000000000 ffff8801d07e8158 ffff8801d07879e0 ffffffff825b9c81 [ 28.082825] ffff8801d07e8170 ffffed003a0fd02b ffffed003a0fd02e ffff8801d07e8168 [ 28.090769] dead4ead00000000 ffff8801d07e8140 0000000000000000 0000000000000000 [ 28.098724] Call Trace: [ 28.101285] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.107746] [] sg_finish_rem_req+0x2b5/0x340 [ 28.113767] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.119883] [] ? sg_get_rq_mark+0x142/0x190 [ 28.125818] [] sg_read+0x8c2/0x1490 [ 28.131058] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.137695] [] ? fsnotify+0xee0/0xee0 [ 28.143113] [] ? avc_policy_seqno+0x9/0x20 [ 28.148963] [] do_loop_readv_writev+0x141/0x1e0 [ 28.155249] [] ? security_file_permission+0x89/0x1e0 [ 28.161985] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.168615] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.175246] [] compat_do_readv_writev+0x5df/0x6e0 [ 28.181708] [] ? vfs_writev+0xb0/0xb0 [ 28.187121] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.193062] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.199170] [] ? rw_verify_area+0x100/0x2f0 [ 28.205112] [] compat_readv+0xd9/0x140 [ 28.210613] [] compat_SyS_readv+0xd8/0x1b0 [ 28.216461] [] ? SyS_pwritev+0x230/0x230 [ 28.222139] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.228336] [] ? SyS_pwritev+0x230/0x230 [ 28.234011] [] do_fast_syscall_32+0x314/0x890 [ 28.240119] [] sysenter_flags_fixed+0xd/0x17 [ 28.246137] 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 [ 28.272435] RIP [] __free_pages+0x21/0x90 [ 28.278313] RSP [ 28.287404] ---[ end trace 8940b63578b02e5a ]--- [ 28.292366] Kernel panic - not syncing: Fatal exception [ 28.297734] Dumping ftrace buffer: [ 28.301241] (ftrace buffer empty) [ 28.304915] Kernel Offset: disabled [ 28.308507] Rebooting in 86400 seconds..