[....] Starting enhanced syslogd: rsyslogd[ 12.612440] audit: type=1400 audit(1521581766.821:4): avc: denied { syslog } for pid=3647 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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 Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.876337] sg_write: data in/out 1969188161/43 bytes for SCSI command 0x79-- guessing data in; [ 26.876337] program syzkaller821304 not setting count and/or reply_len properly [ 26.894039] kasan: CONFIG_KASAN_INLINE enabled [ 26.898590] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.906487] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.912704] Dumping ftrace buffer: [ 26.916211] (ftrace buffer empty) [ 26.919890] Modules linked in: [ 26.923167] CPU: 0 PID: 3804 Comm: syzkaller821304 Not tainted 4.9.88-g71df7bb #60 [ 26.930838] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.940159] task: ffff8801b49a4800 task.stack: ffff8801d7a60000 [ 26.946180] RIP: 0010:[] [] sg_read+0xd06/0x1440 [ 26.954235] RSP: 0018:ffff8801d7a67a50 EFLAGS: 00010246 [ 26.959651] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8266c03d [ 26.966890] RDX: 0000000000000000 RSI: 0000000000010000 RDI: ffff8801d85e4370 [ 26.974129] RBP: ffff8801d7a67b60 R08: 0000000000000000 R09: ffffed0039a6bfc1 [ 26.981383] R10: 0000000000000005 R11: ffffed0039a6bfc0 R12: 0000000000001000 [ 26.988622] R13: 0000000000000000 R14: ffff8801cd35fde0 R15: ffff8801d85e4340 [ 26.995860] FS: 000000000118e880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.004052] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.009903] CR2: 0000000020e94000 CR3: 00000001da3dc000 CR4: 0000000000160670 [ 27.017144] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.024380] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.031614] Stack: [ 27.033731] ffffffff844de420 0000000000000105 ffff8801d85e4358 ffff880100010000 [ 27.041695] 0000000000000246 ffff8801d85e4368 0000000000010024 ffffffff83be4b20 [ 27.049652] ffff8801cfe6a780 1ffff1003af4cf56 0000000020e94000 0000000020e94024 [ 27.057615] Call Trace: [ 27.060172] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.066804] [] ? fsnotify+0x86/0xf30 [ 27.072131] [] ? fsnotify+0xf30/0xf30 [ 27.077551] [] ? avc_policy_seqno+0x9/0x20 [ 27.083401] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 27.090293] [] do_readv_writev+0x5fd/0x740 [ 27.096146] [] ? vfs_write+0x530/0x530 [ 27.101652] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.107591] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 27.114655] [] ? handle_mm_fault+0x4ad/0x2460 [ 27.120766] [] ? __pmd_alloc+0x410/0x410 [ 27.126446] [] ? avc_policy_seqno+0x9/0x20 [ 27.132299] [] vfs_readv+0x84/0xc0 [ 27.137455] [] do_readv+0xe6/0x250 [ 27.142613] [] ? vfs_readv+0xc0/0xc0 [ 27.147941] [] SyS_readv+0x27/0x30 [ 27.153100] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 27.159644] [] do_syscall_64+0x1a4/0x490 [ 27.165320] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.172210] Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8a 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 df 05 00 00 48 8b 1b 48 85 db 0f 84 51 03 00 [ 27.198662] RIP [] sg_read+0xd06/0x1440 [ 27.204366] RSP [ 27.208226] ---[ end trace 75e80ff0823e62af ]--- [ 27.213018] Kernel panic - not syncing: Fatal exception [ 27.218787] Dumping ftrace buffer: [ 27.222297] (ftrace buffer empty) [ 27.225976] Kernel Offset: disabled [ 27.229570] Rebooting in 86400 seconds..