[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.338165] 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: [ 20.516741] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.823398] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.625864] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) [ 21.807144] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 27.209159] random: sshd: uninitialized urandom read (32 bytes read, 106 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 [ 27.301170] sg_write: data in/out 1870749719/174 bytes for SCSI command 0x46-- guessing data in; [ 27.301170] program syzkaller755267 not setting count and/or reply_len properly [ 27.308243] sg_write: data in/out 1870749719/174 bytes for SCSI command 0x46-- guessing data in; [ 27.308243] program syzkaller755267 not setting count and/or reply_len properly [ 27.344737] 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 [ 27.349194] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.418144] Dumping ftrace buffer: [ 27.421652] (ftrace buffer empty) [ 27.425328] Modules linked in: [ 27.428597] CPU: 1 PID: 3328 Comm: syzkaller755267 Not tainted 4.4.107-g610c835 #12 [ 27.436355] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.446341] task: ffff8800b56217c0 task.stack: ffff8801d0c58000 [ 27.452370] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.460596] RSP: 0018:ffff8801d0c5fb00 EFLAGS: 00010a07 [ 27.466009] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.473243] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 27.480480] RBP: ffff8801d0c5fb10 R08: ffffed001696e070 R09: ffff8800b4b70360 [ 27.487715] R10: 0000000000000005 R11: ffffed001696e070 R12: 0000000000000004 [ 27.494952] R13: 0000000000000020 R14: ffff8801d1352100 R15: dffffc0000000000 [ 27.502189] FS: 00007f76ddfcb700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.510380] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.516226] CR2: 00000000205c7f24 CR3: 00000001d177a000 CR4: 00000000001406e0 [ 27.523463] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.530699] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.537935] Stack: [ 27.540047] 0000000000000000 ffff8801d1352258 ffff8801d0c5fb70 ffffffff825b8cf1 [ 27.548002] ffff8801d1352270 ffffed003a26a44b ffffed003a26a44e ffff8801d1352268 [ 27.555953] dead4ead00000000 ffff8801d1352240 0000000000000000 0000000000000000 [ 27.563907] Call Trace: [ 27.566462] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.572920] [] sg_finish_rem_req+0x2b5/0x340 [ 27.578943] [] sg_read+0xa21/0x1490 [ 27.584186] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.590816] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.597794] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.604428] [] __vfs_read+0x103/0x440 [ 27.609844] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.615782] [] ? fsnotify+0x5ad/0xee0 [ 27.621198] [] ? fsnotify+0xee0/0xee0 [ 27.626615] [] ? avc_policy_seqno+0x9/0x20 [ 27.632466] [] ? selinux_file_permission+0x348/0x460 [ 27.639186] [] ? security_file_permission+0x89/0x1e0 [ 27.645903] [] ? rw_verify_area+0x100/0x2f0 [ 27.651840] [] vfs_read+0x123/0x3a0 [ 27.657080] [] SyS_read+0xd9/0x1b0 [ 27.662234] [] ? do_sendfile+0xd30/0xd30 [ 27.667911] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.674370] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 27.680909] 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 [ 27.707275] RIP [] __free_pages+0x21/0x90 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.713150] RSP [ 27.723730] ---[ end trace be14116082fc576e ]--- [ 27.769409] Kernel panic - not syncing: Fatal exception [ 27.775244] Dumping ftrace buffer: [ 27.778759] (ftrace buffer empty) [ 27.782439] Kernel Offset: disabled [ 27.786027] Rebooting in 86400 seconds..