[ 16.843126] 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: [ 20.970788] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.386401] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.189659] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) [ 22.363381] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. [ 27.766274] random: sshd: uninitialized urandom read (32 bytes read, 107 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.608694] random: nonblocking pool is initialized [ 28.609564] kasan: CONFIG_KASAN_INLINE enabled [ 28.609570] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.609573] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.609576] Dumping ftrace buffer: [ 28.609579] (ftrace buffer empty) [ 28.609581] Modules linked in: [ 28.609585] CPU: 0 PID: 3327 Comm: syzkaller521953 Not tainted 4.4.111-gf851888 #16 [ 28.609588] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.609591] task: ffff8801cfd717c0 task.stack: ffff8801cfd40000 [ 28.609601] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.609603] RSP: 0018:ffff8801cfd47970 EFLAGS: 00010a07 [ 28.609605] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 28.609607] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.609609] RBP: ffff8801cfd47980 R08: 0000000000000001 R09: 0000000000000000 [ 28.609612] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.609614] R13: 0000000000000020 R14: ffff8800b4c80000 R15: dffffc0000000000 [ 28.609617] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009167840 [ 28.609622] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.609624] CR2: 00000000204e9fd0 CR3: 00000000b178c000 CR4: 0000000000160670 [ 28.609629] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.609630] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.609631] Stack: [ 28.609636] 0000000000000000 ffff8800b4c80158 ffff8801cfd479e0 ffffffff825b9ec1 [ 28.609639] ffff8800b4c80170 ffffed001699002b ffffed001699002e ffff8800b4c80168 [ 28.609643] dead4ead00000000 ffff8800b4c80140 0000000000000000 0000000000000000 [ 28.609644] Call Trace: [ 28.609652] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.609656] [] sg_finish_rem_req+0x2b5/0x340 [ 28.609660] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.609663] [] ? sg_get_rq_mark+0x142/0x190 [ 28.609667] [] sg_read+0x8c2/0x1490 [ 28.609671] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.609676] [] ? fsnotify+0xee0/0xee0 [ 28.609682] [] ? avc_policy_seqno+0x9/0x20 [ 28.609689] [] do_loop_readv_writev+0x141/0x1e0 [ 28.609693] [] ? security_file_permission+0x89/0x1e0 [ 28.609697] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.609700] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.609704] [] compat_do_readv_writev+0x5df/0x6e0 [ 28.609708] [] ? vfs_writev+0xb0/0xb0 [ 28.609713] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.609718] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.609722] [] ? rw_verify_area+0x100/0x2f0 [ 28.609726] [] compat_readv+0xd9/0x140 [ 28.609729] [] compat_SyS_readv+0xd8/0x1b0 [ 28.609732] [] ? SyS_pwritev+0x230/0x230 [ 28.609737] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.609740] [] ? SyS_pwritev+0x230/0x230 [ 28.609743] [] do_fast_syscall_32+0x314/0x890 [ 28.609748] [] sysenter_flags_fixed+0xd/0x17 [ 28.609795] 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 [ 28.609799] RIP [] __free_pages+0x21/0x90 [ 28.609800] RSP [ 28.609804] ---[ end trace 30d76092511d8f52 ]--- [ 28.609807] Kernel panic - not syncing: Fatal exception [ 28.961151] Dumping ftrace buffer: [ 28.964708] (ftrace buffer empty) [ 28.968390] Kernel Offset: disabled [ 28.971981] Rebooting in 86400 seconds..