[....] Starting enhanced syslogd: rsyslogd[ 12.294035] audit: type=1400 audit(1521027648.802:4): 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 '10.128.10.18' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 37.297240] IPVS: Creating netns size=2536 id=1 [ 37.310235] kasan: CONFIG_KASAN_INLINE enabled [ 37.315010] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 37.323462] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.329668] Dumping ftrace buffer: [ 37.333178] (ftrace buffer empty) [ 37.334537] IPVS: Creating netns size=2536 id=2 [ 37.339848] kasan: CONFIG_KASAN_INLINE enabled [ 37.339850] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 37.353369] Modules linked in: [ 37.356652] CPU: 0 PID: 3833 Comm: syzkaller086119 Not tainted 4.9.87-g97d7f1c #54 [ 37.364327] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.373652] task: ffff8801cdbbe000 task.stack: ffff8801d7ad0000 [ 37.379677] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 37.387912] RSP: 0018:ffff8801d7ad7940 EFLAGS: 00010a07 [ 37.393327] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826692ab [ 37.400739] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 37.407979] RBP: ffff8801d7ad7950 R08: 0000000048000000 R09: 0000000000001e30 [ 37.415218] R10: 0000000000002100 R11: ffff8801cdbbe000 R12: 0000000000000004 [ 37.422471] R13: 0000000000000020 R14: ffff8801d84a4200 R15: dffffc0000000000 [ 37.429715] FS: 00007f6916528700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 37.437927] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.443782] CR2: 0000000020e94000 CR3: 00000001da34c000 CR4: 0000000000160670 [ 37.451022] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.458317] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.465555] Stack: [ 37.467672] 0000000000000001 ffff8801d84a4358 ffff8801d7ad79b0 ffffffff826692d1 [ 37.475639] ffff8801d84a4370 ffffed003b09486b ffffed003b09486e ffff8801d84a4368 [ 37.483602] dead4ead00000000 ffff8801d84a4340 0000000000000000 0000000000000000 [ 37.491578] Call Trace: [ 37.494138] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 37.500602] [] sg_finish_rem_req+0x2b5/0x340 [ 37.506628] [] sg_new_read.isra.20+0x18d/0x3e0 [ 37.512832] [] sg_read+0x8b7/0x1440 [ 37.518080] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 37.524716] [] ? fsnotify+0x86/0xf30 [ 37.530047] [] ? fsnotify+0xf30/0xf30 [ 37.535483] [] ? avc_policy_seqno+0x9/0x20 [ 37.541343] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 37.548242] [] do_readv_writev+0x5fd/0x740 [ 37.554106] [] ? vfs_write+0x530/0x530 [ 37.559614] [] ? exit_robust_list+0x230/0x230 [ 37.565727] [] ? __fget+0x20a/0x3b0 [ 37.570970] [] ? __fget+0x231/0x3b0 [ 37.576212] [] ? __fget+0x47/0x3b0 [ 37.581372] [] vfs_readv+0x84/0xc0 [ 37.586537] [] do_readv+0xe6/0x250 [ 37.591693] [] ? vfs_readv+0xc0/0xc0 [ 37.597023] [] ? SyS_read+0x1b0/0x1b0 [ 37.602441] [] SyS_readv+0x27/0x30 [ 37.607612] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 37.614159] [] do_syscall_64+0x1a4/0x490 [ 37.619839] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 37.626732] 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 [ 37.653321] RIP [] __free_pages+0x21/0x80 [ 37.659207] RSP [ 37.662820] general protection fault: 0000 [#2] PREEMPT SMP KASAN [ 37.663804] ---[ end trace aa83fb4bd6385ef2 ]--- [ 37.663807] Kernel panic - not syncing: Fatal exception [ 37.679114] Dumping ftrace buffer: [ 37.682624] (ftrace buffer empty) [ 37.686302] Modules linked in: [ 37.689580] CPU: 1 PID: 3836 Comm: syzkaller086119 Tainted: G D 4.9.87-g97d7f1c #54 [ 37.698468] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.707798] task: ffff8801d95e1800 task.stack: ffff8801d7a78000 [ 37.713822] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 37.722051] RSP: 0018:ffff8801d7a7f940 EFLAGS: 00010a07 [ 37.727467] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826692ab [ 37.734706] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 37.741955] RBP: ffff8801d7a7f950 R08: 0000000048000000 R09: 0000000000001e30 [ 37.749194] R10: 0000000000002100 R11: ffff8801d95e1800 R12: 0000000000000004 [ 37.756434] R13: 0000000000000020 R14: ffff8801d7a0c200 R15: dffffc0000000000 [ 37.763675] FS: 00007f6916528700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.771872] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.777719] CR2: 000000002085dff0 CR3: 00000001da2b2000 CR4: 0000000000160670 [ 37.784962] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.792199] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.799438] Stack: [ 37.801574] 0000000000000001 ffff8801d7a0c358 ffff8801d7a7f9b0 ffffffff826692d1 [ 37.809538] ffff8801d7a0c370 ffffed003af4186b ffffed003af4186e ffff8801d7a0c368 [ 37.817873] dead4ead00000000 ffff8801d7a0c340 0000000000000000 0000000000000000 [ 37.825960] Call Trace: [ 37.828518] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 37.834980] [] sg_finish_rem_req+0x2b5/0x340 [ 37.841008] [] sg_new_read.isra.20+0x18d/0x3e0 [ 37.847205] [] sg_read+0x8b7/0x1440 [ 37.852468] [] ? __check_object_size+0x174/0x3a9 [ 37.858845] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 37.865494] [] ? fsnotify+0x86/0xf30 [ 37.870823] [] ? fsnotify+0xf30/0xf30 [ 37.876251] [] ? avc_policy_seqno+0x9/0x20 [ 37.882103] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 37.888998] [] do_readv_writev+0x5fd/0x740 [ 37.894849] [] ? vfs_write+0x530/0x530 [ 37.900528] [] ? _raw_spin_unlock+0x2c/0x50 [ 37.906470] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 37.913742] [] ? __fget+0x47/0x3b0 [ 37.918925] [] ? __fget+0x20a/0x3b0 [ 37.924167] [] ? __fget+0x231/0x3b0 [ 37.929412] [] ? __fget+0x47/0x3b0 [ 37.934582] [] vfs_readv+0x84/0xc0 [ 37.939748] [] do_readv+0xe6/0x250 [ 37.944906] [] ? vfs_readv+0xc0/0xc0 [ 37.950237] [] SyS_readv+0x27/0x30 [ 37.955395] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 37.961941] [] do_syscall_64+0x1a4/0x490 [ 37.967623] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 37.974516] 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 [ 38.001041] RIP [] __free_pages+0x21/0x80 [ 38.006922] RSP [ 38.010972] Dumping ftrace buffer: [ 38.014507] (ftrace buffer empty) [ 38.018194] Kernel Offset: disabled [ 38.021794] Rebooting in 86400 seconds..