[....] Starting enhanced syslogd: rsyslogd[ 13.294182] audit: type=1400 audit(1515282098.081:4): avc: denied { syslog } for pid=3176 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 '10.128.15.245' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.608826] sg_write: data in/out 30202/1 bytes for SCSI command 0x2c-- guessing data in; [ 26.608826] program syzkaller325963 not setting count and/or reply_len properly [ 26.625287] kasan: CONFIG_KASAN_INLINE enabled [ 26.629855] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.637193] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.643407] Dumping ftrace buffer: [ 26.646923] (ftrace buffer empty) [ 26.650615] Modules linked in: [ 26.653908] CPU: 1 PID: 3333 Comm: syzkaller325963 Not tainted 4.9.75-g06fe41f #16 [ 26.661592] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.670925] task: ffff8801cb513000 task.stack: ffff8801c81d0000 [ 26.676945] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.685345] RSP: 0018:ffff8801c81d7940 EFLAGS: 00010a07 [ 26.690932] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 26.698168] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.705402] RBP: ffff8801c81d7950 R08: 0000000000000001 R09: 0000000000000001 [ 26.712634] R10: 0000000000000000 R11: ffff8801cb513000 R12: 0000000000000004 [ 26.719870] R13: 0000000000000020 R14: ffff8801c95d8000 R15: dffffc0000000000 [ 26.727104] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:000000000a002840 [ 26.735291] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.741139] CR2: 0000000020aaaf6b CR3: 00000001c9ab4000 CR4: 0000000000160670 [ 26.748372] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.755603] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.764834] Stack: [ 26.767556] ffffffff838b15a9 ffff8801c95d8158 ffff8801c81d79b0 ffffffff82666341 [ 26.776627] ffff8801c95d8170 ffffed00392bb02b ffffed00392bb02e ffff8801c95d8168 [ 26.784569] dead4ead00000000 ffff8801c95d8140 0000000000000000 0000000000000000 [ 26.792505] Call Trace: [ 26.795057] [] ? retint_kernel+0x2d/0x2d [ 26.800730] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 26.807183] [] sg_finish_rem_req+0x2b5/0x340 [ 26.813204] [] sg_new_read.isra.20+0x356/0x3e0 [ 26.819397] [] ? sg_get_rq_mark+0x81/0x190 [ 26.825245] [] sg_read+0x8bd/0x1440 [ 26.830486] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.837115] [] ? fsnotify+0xf30/0xf30 [ 26.842531] [] ? avc_policy_seqno+0x9/0x20 [ 26.848377] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 26.855352] [] ? security_file_permission+0x89/0x1e0 [ 26.862068] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.868693] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.875322] [] compat_do_readv_writev+0x522/0x760 [ 26.881776] [] ? do_pwritev+0x1a0/0x1a0 [ 26.887968] [] ? sg_ioctl+0x2c30/0x2c30 [ 26.893728] [] ? do_iter_readv_writev+0x400/0x400 [ 26.900187] [] ? __might_sleep+0x95/0x1a0 [ 26.905954] [] ? __inode_security_revalidate+0xd9/0x130 [ 26.912932] [] ? __fsnotify_parent+0xbc/0x340 [ 26.919046] [] ? avc_policy_seqno+0x9/0x20 [ 26.924891] [] ? fsnotify+0x86/0xf30 [ 26.930219] [] ? fsnotify+0xf30/0xf30 [ 26.935631] [] compat_readv+0xe3/0x150 [ 26.941131] [] do_compat_readv+0xf4/0x1d0 [ 26.946890] [] ? compat_readv+0x150/0x150 [ 26.952648] [] ? SyS_read+0x1b0/0x1b0 [ 26.958062] [] compat_SyS_readv+0x26/0x30 [ 26.963823] [] ? SyS_pwritev2+0x80/0x80 [ 26.969410] [] do_fast_syscall_32+0x2f7/0x890 [ 26.975951] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.983020] [] entry_SYSENTER_compat+0x74/0x83 [ 26.989212] Code: e9 27 fc ff ff 0f 1f 44 00 00 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 3d [ 27.015509] RIP [] __free_pages+0x21/0x80 [ 27.021909] RSP [ 27.026052] ---[ end trace 8dcdb7e62dd394f8 ]--- [ 27.030908] Kernel panic - not syncing: Fatal exception [ 27.036591] Dumping ftrace buffer: [ 27.040098] (ftrace buffer empty) [ 27.043788] Kernel Offset: disabled [ 27.047646] Rebooting in 86400 seconds..