[....] Starting enhanced syslogd: rsyslogd[ 12.239291] audit: type=1400 audit(1519432819.653:4): avc: denied { syslog } for pid=3648 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 31.223554] kasan: CONFIG_KASAN_INLINE enabled [ 31.228203] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 31.235539] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.241737] Dumping ftrace buffer: [ 31.245244] (ftrace buffer empty) [ 31.248928] Modules linked in: [ 31.252206] CPU: 1 PID: 3808 Comm: syzkaller438190 Not tainted 4.9.83-g72766d7 #42 [ 31.254077] kasan: CONFIG_KASAN_INLINE enabled [ 31.254079] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 31.271759] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.281082] task: ffff8801d8d50000 task.stack: ffff8801c9250000 [ 31.287106] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 31.295343] RSP: 0018:ffff8801c9257950 EFLAGS: 00010a07 [ 31.300765] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826687fb [ 31.308026] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 31.315267] RBP: ffff8801c9257960 R08: 0000000048000000 R09: 0000000000001e30 [ 31.322509] R10: 0000000000002100 R11: ffff8801d8d50000 R12: 0000000000000004 [ 31.329746] R13: 0000000000000020 R14: ffff8801d9620000 R15: dffffc0000000000 [ 31.336987] FS: 00007fde6b053700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.345180] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.351029] CR2: 0000000020a13000 CR3: 00000001b326c000 CR4: 0000000000160670 [ 31.358270] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.365508] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.372743] Stack: [ 31.374863] 0000000000000001 ffff8801d9620158 ffff8801c92579c0 ffffffff82668821 [ 31.382847] ffff8801d9620170 ffffed003b2c402b ffffed003b2c402e ffff8801d9620168 [ 31.390808] dead4ead00000000 ffff8801d9620140 0000000000000000 0000000000000000 [ 31.398777] Call Trace: [ 31.401337] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 31.407794] [] sg_finish_rem_req+0x2b5/0x340 [ 31.413819] [] sg_new_read.isra.20+0x18d/0x3e0 [ 31.420017] [] sg_read+0x8b7/0x1440 [ 31.425259] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 31.431896] [] ? fsnotify+0xf30/0xf30 [ 31.437316] [] ? avc_policy_seqno+0x9/0x20 [ 31.443169] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 31.450148] [] ? security_file_permission+0x89/0x1e0 [ 31.456867] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 31.463515] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 31.470150] [] do_readv_writev+0x520/0x750 [ 31.476001] [] ? vfs_write+0x530/0x530 [ 31.481505] [] ? check_preemption_disabled+0x3b/0x200 [ 31.488317] [] ? __fget+0x20a/0x3b0 [ 31.493560] [] ? __fget+0x231/0x3b0 [ 31.498801] [] ? __fget+0x47/0x3b0 [ 31.503957] [] vfs_readv+0x84/0xc0 [ 31.509114] [] do_readv+0xe6/0x250 [ 31.514445] [] ? vfs_readv+0xc0/0xc0 [ 31.519777] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 31.526063] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 31.532870] [] SyS_readv+0x27/0x30 [ 31.538032] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 31.544577] [] do_syscall_64+0x1a4/0x490 [ 31.550256] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 31.557154] 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 [ 31.583747] RIP [] __free_pages+0x21/0x80 [ 31.589722] RSP [ 31.593328] general protection fault: 0000 [#2] PREEMPT SMP KASAN [ 31.593970] ---[ end trace 3e6b47de8e9a966d ]--- [ 31.593974] Kernel panic - not syncing: Fatal exception [ 31.609605] Dumping ftrace buffer: [ 31.613112] (ftrace buffer empty) [ 31.616790] Modules linked in: [ 31.620073] CPU: 0 PID: 3807 Comm: syzkaller438190 Tainted: G D 4.9.83-g72766d7 #42 [ 31.628972] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.638295] task: ffff8801b5490000 task.stack: ffff8801d7ae0000 [ 31.644319] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 31.652548] RSP: 0018:ffff8801d7ae7950 EFLAGS: 00010a07 [ 31.657963] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826687fb [ 31.665202] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 31.672437] RBP: ffff8801d7ae7960 R08: 0000000048000000 R09: 0000000000001e30 [ 31.679672] R10: 0000000000002100 R11: ffff8801b5490000 R12: 0000000000000004 [ 31.686910] R13: 0000000000000020 R14: ffff8801d7c8c200 R15: dffffc0000000000 [ 31.694148] FS: 00007fde6b074700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.702345] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.708194] CR2: 00007fde6b052e78 CR3: 00000001b326c000 CR4: 0000000000160670 [ 31.715433] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.722669] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.729908] Stack: [ 31.732034] 0000000000000001 ffff8801d7c8c358 ffff8801d7ae79c0 ffffffff82668821 [ 31.740000] ffff8801d7c8c370 ffffed003af9186b ffffed003af9186e ffff8801d7c8c368 [ 31.747966] dead4ead00000000 ffff8801d7c8c340 0000000000000000 0000000000000000 [ 31.755930] Call Trace: [ 31.758488] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 31.764947] [] sg_finish_rem_req+0x2b5/0x340 [ 31.770970] [] sg_new_read.isra.20+0x18d/0x3e0 [ 31.777169] [] sg_read+0x8b7/0x1440 [ 31.782416] [] ? __check_object_size+0x174/0x3a9 [ 31.788789] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 31.795422] [] ? fsnotify+0xf30/0xf30 [ 31.800840] [] ? avc_policy_seqno+0x9/0x20 [ 31.806694] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 31.813673] [] ? security_file_permission+0x89/0x1e0 [ 31.820394] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 31.827027] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 31.833659] [] do_readv_writev+0x520/0x750 [ 31.839510] [] ? vfs_write+0x530/0x530 [ 31.845017] [] ? exit_robust_list+0x230/0x230 [ 31.851133] [] ? __fget+0x47/0x3b0 [ 31.856289] [] ? __fget+0x20a/0x3b0 [ 31.861532] [] ? __fget+0x231/0x3b0 [ 31.866772] [] ? __fget+0x47/0x3b0 [ 31.871928] [] vfs_readv+0x84/0xc0 [ 31.877086] [] do_readv+0xe6/0x250 [ 31.882249] [] ? vfs_readv+0xc0/0xc0 [ 31.887577] [] ? SyS_read+0x1b0/0x1b0 [ 31.892991] [] SyS_readv+0x27/0x30 [ 31.898147] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 31.904692] [] do_syscall_64+0x1a4/0x490 [ 31.910382] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 31.917275] 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 [ 31.943908] RIP [] __free_pages+0x21/0x80 [ 31.949792] RSP [ 31.953732] Dumping ftrace buffer: [ 31.957263] (ftrace buffer empty) [ 31.960944] Kernel Offset: disabled [ 31.964545] Rebooting in 86400 seconds..