[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.321770] 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: [ 20.282710] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.594216] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.324702] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) [ 26.134751] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) Warning: Permanently added '10.128.15.228' (ECDSA) to the list of known hosts. [ 31.533645] random: sshd: uninitialized urandom read (32 bytes read, 97 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 [ 31.626818] sg_write: data in/out 822404280/64 bytes for SCSI command 0x12-- guessing data in; [ 31.626818] program syzkaller193715 not setting count and/or reply_len properly [ 31.632718] sg_write: data in/out 822404280/64 bytes for SCSI command 0x12-- guessing data in; [ 31.632718] program syzkaller193715 not setting count and/or reply_len properly [ 31.672007] kasan: CONFIG_KASAN_INLINE enabled executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.676583] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.695876] Dumping ftrace buffer: [ 31.699382] (ftrace buffer empty) [ 31.703073] Modules linked in: [ 31.706345] CPU: 0 PID: 3332 Comm: syzkaller193715 Not tainted 4.4.107-g610c835 #12 [ 31.714105] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.723434] task: ffff8801d0af2f80 task.stack: ffff8800b3d98000 [ 31.729456] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 31.737684] RSP: 0018:ffff8800b3d9fa40 EFLAGS: 00010a07 [ 31.743101] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 31.750345] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 31.757583] RBP: ffff8800b3d9fa50 R08: ffffed0016b357c0 R09: ffff8800b59abde0 [ 31.764822] R10: 0000000000000005 R11: ffffed0016b357c0 R12: 0000000000000004 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.772071] R13: 0000000000000020 R14: ffff8800b531c200 R15: dffffc0000000000 [ 31.779319] FS: 00007f8f3746b700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.787514] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.793366] CR2: 0000000020005000 CR3: 00000001d542f000 CR4: 00000000001406f0 [ 31.800612] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.807854] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.815099] Stack: [ 31.817216] 0000000000000000 ffff8800b531c358 ffff8800b3d9fab0 ffffffff825b8cf1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.825165] ffff8800b531c370 ffffed0016a6386b ffffed0016a6386e ffff8800b531c368 [ 31.833131] dead4ead00000000 ffff8800b531c340 0000000000000000 0000000000000000 [ 31.841079] Call Trace: [ 31.843637] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 31.850193] [] sg_finish_rem_req+0x2b5/0x340 [ 31.856218] [] sg_read+0xa21/0x1490 [ 31.861465] [] ? __check_object_size+0x154/0x35b [ 31.867850] [] ? sg_proc_seq_show_debug+0xd30/0xd30 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.874485] [] ? fsnotify+0xee0/0xee0 [ 31.879906] [] ? avc_policy_seqno+0x9/0x20 [ 31.885762] [] do_loop_readv_writev+0x141/0x1e0 [ 31.892054] [] ? security_file_permission+0x89/0x1e0 [ 31.898777] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 31.905421] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 31.912054] [] do_readv_writev+0x5dd/0x6e0 [ 31.917903] [] ? vfs_write+0x530/0x530 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.923409] [] ? __fget+0x232/0x3b0 [ 31.928653] [] ? __fget+0x47/0x3b0 [ 31.933820] [] vfs_readv+0x78/0xb0 [ 31.938975] [] SyS_readv+0xd9/0x240 [ 31.944220] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 31.950775] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.957244] [] entry_SYSCALL_64_fastpath+0x16/0x76 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.963788] Code: 76 ae 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 [ 31.990131] RIP [] __free_pages+0x21/0x90 [ 31.996012] RSP [ 32.014913] ---[ end trace c7aa4a4201178fb0 ]--- [ 32.019914] Kernel panic - not syncing: Fatal exception [ 32.025587] Dumping ftrace buffer: [ 32.029095] (ftrace buffer empty) [ 32.032780] Kernel Offset: disabled [ 32.036373] Rebooting in 86400 seconds..