[ 15.540958] 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: [ 20.668151] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.993424] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.818109] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) [ 39.910825] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 45.279245] random: sshd: uninitialized urandom read (32 bytes read, 122 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 [ 45.373093] sg_write: data in/out 36090/1 bytes for SCSI command 0x67-- guessing data in; [ 45.373093] program syzkaller436710 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 46.107211] random: nonblocking pool is initialized [ 46.108794] kasan: CONFIG_KASAN_INLINE enabled [ 46.108800] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 46.108803] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 46.108805] Dumping ftrace buffer: [ 46.108808] (ftrace buffer empty) [ 46.108810] Modules linked in: [ 46.108815] CPU: 1 PID: 3521 Comm: syzkaller436710 Not tainted 4.4.110-gdac1439 #20 [ 46.108817] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.108820] task: ffff8801d52ac740 task.stack: ffff8800b0c18000 [ 46.108831] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 46.108833] RSP: 0018:ffff8800b0c1f9f0 EFLAGS: 00010a07 [ 46.108836] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 46.108838] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 46.108840] RBP: ffff8800b0c1fa00 R08: 0000000000000001 R09: 0000000000000000 [ 46.108842] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 46.108844] R13: 0000000000000020 R14: ffff8801d0f74200 R15: dffffc0000000000 [ 46.108847] FS: 0000000001b3a880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 46.108849] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.108851] CR2: 0000000020bb7000 CR3: 00000000b47da000 CR4: 0000000000160670 [ 46.108855] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.108857] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.108858] Stack: [ 46.108863] 0000000000000000 ffff8801d0f74358 ffff8800b0c1fa60 ffffffff825b9c81 [ 46.108867] ffff8801d0f74370 ffffed003a1ee86b ffffed003a1ee86e ffff8801d0f74368 [ 46.108871] dead4ead00000000 ffff8801d0f74340 0000000000000000 0000000000000000 [ 46.108872] Call Trace: [ 46.108879] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 46.108883] [] sg_finish_rem_req+0x2b5/0x340 [ 46.108887] [] sg_new_read.isra.18+0x39/0x3c0 [ 46.108890] [] ? sg_get_rq_mark+0x142/0x190 [ 46.108894] [] sg_read+0x8c2/0x1490 [ 46.108900] [] ? __check_object_size+0x154/0x35b [ 46.108904] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 46.108908] [] ? fsnotify+0xee0/0xee0 [ 46.108914] [] ? avc_policy_seqno+0x9/0x20 [ 46.108918] [] do_loop_readv_writev+0x141/0x1e0 [ 46.108923] [] ? security_file_permission+0x89/0x1e0 [ 46.108926] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 46.108930] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 46.108934] [] do_readv_writev+0x5dd/0x6e0 [ 46.108937] [] ? vfs_write+0x530/0x530 [ 46.108942] [] ? _raw_spin_unlock+0x2c/0x50 [ 46.108946] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 46.108951] [] ? handle_mm_fault+0x3f2/0x3190 [ 46.108956] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 46.108959] [] ? __fsnotify_parent+0xbc/0x340 [ 46.108963] [] ? avc_policy_seqno+0x9/0x20 [ 46.108966] [] ? fsnotify+0x5ad/0xee0 [ 46.108970] [] vfs_readv+0x78/0xb0 [ 46.108973] [] SyS_readv+0xd9/0x240 [ 46.108976] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 46.108980] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 46.108984] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 46.109032] 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 [ 46.109036] RIP [] __free_pages+0x21/0x90 [ 46.109037] RSP [ 46.109041] ---[ end trace 5d1a64b99ba65d61 ]--- [ 46.109043] Kernel panic - not syncing: Fatal exception [ 46.479264] Dumping ftrace buffer: [ 46.482804] (ftrace buffer empty) [ 46.486481] Kernel Offset: disabled [ 46.490074] Rebooting in 86400 seconds..