[ 16.487003] 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: [ 21.790682] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.213151] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.097412] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) [ 23.289611] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 28.699843] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) executing program executing program executing program executing program executing program [ 28.800932] sg_write: data in/out 36090/1 bytes for SCSI command 0xe2-- guessing data in; [ 28.800932] program syzkaller373945 not setting count and/or reply_len properly [ 28.807718] sg_write: data in/out 36090/1 bytes for SCSI command 0xe2-- guessing data in; [ 28.807718] program syzkaller373945 not setting count and/or reply_len properly [ 28.810243] kasan: CONFIG_KASAN_INLINE enabled [ 28.810253] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.810257] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.810262] Dumping ftrace buffer: [ 28.810265] (ftrace buffer empty) [ 28.810269] Modules linked in: [ 28.810276] CPU: 1 PID: 3334 Comm: syzkaller373945 Not tainted 4.4.110-gdac1439 #20 [ 28.810280] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.810284] task: ffff8800b427df00 task.stack: ffff8800b4ea0000 [ 28.810301] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.810305] RSP: 0018:ffff8800b4ea79f0 EFLAGS: 00010a07 [ 28.810308] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 28.810312] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 28.810316] RBP: ffff8800b4ea7a00 R08: 0000000048000000 R09: 0000000000001e30 [ 28.810319] R10: 0000000000002100 R11: 1ffff100169d4f1c R12: 0000000000000004 [ 28.810322] R13: 0000000000000020 R14: ffff8801d167c200 R15: dffffc0000000000 [ 28.810327] FS: 00007f49a1528700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.810331] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.810335] CR2: 00000000203aafa0 CR3: 00000000b4e9e000 CR4: 0000000000160670 [ 28.810341] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.810344] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.810345] Stack: [ 28.810353] 0000000000000246 ffff8801d167c358 ffff8800b4ea7a60 ffffffff825b9c81 [ 28.810360] ffff8801d167c370 ffffed003a2cf86b ffffed003a2cf86e ffff8801d167c368 [ 28.810367] dead4ead00000000 ffff8801d167c340 0000000000000000 0000000000000000 [ 28.810368] Call Trace: [ 28.810380] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.810387] [] sg_finish_rem_req+0x2b5/0x340 [ 28.810393] [] sg_new_read.isra.18+0x17d/0x3c0 [ 28.810399] [] sg_read+0x8c2/0x1490 [ 28.810409] [] ? __check_object_size+0x154/0x35b [ 28.810416] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.810423] [] ? fsnotify+0xee0/0xee0 [ 28.810432] [] ? avc_policy_seqno+0x9/0x20 [ 28.810440] [] do_loop_readv_writev+0x141/0x1e0 [ 28.810446] [] ? security_file_permission+0x89/0x1e0 [ 28.810453] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.810459] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.810466] [] do_readv_writev+0x5dd/0x6e0 [ 28.810472] [] ? vfs_write+0x530/0x530 [ 28.810479] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.810486] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.810493] [] ? __fget+0x232/0x3b0 [ 28.810498] [] ? __fget+0x47/0x3b0 [ 28.810504] [] vfs_readv+0x78/0xb0 [ 28.810509] [] SyS_readv+0xd9/0x240 [ 28.810515] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.810522] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.810528] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.810612] 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 [ 28.810618] RIP [] __free_pages+0x21/0x90 [ 28.810620] RSP [ 28.810627] ---[ end trace 17608c9bb212e294 ]--- [ 28.810631] Kernel panic - not syncing: Fatal exception [ 28.817242] Dumping ftrace buffer: [ 28.817244] (ftrace buffer empty) [ 28.817246] Kernel Offset: disabled [ 29.186314] Rebooting in 86400 seconds..