[....] Starting enhanced syslogd: rsyslogd[ 12.505305] audit: type=1400 audit(1519345500.712:4): avc: denied { syslog } for pid=3502 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 '10.128.0.38' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 24.192622] kasan: CONFIG_KASAN_INLINE enabled [ 24.197320] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 24.204660] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 24.210859] Dumping ftrace buffer: [ 24.214367] (ftrace buffer empty) [ 24.218052] Modules linked in: [ 24.221339] CPU: 0 PID: 3660 Comm: syzkaller951887 Not tainted 4.9.83-gda9fb78 #40 [ 24.222905] kasan: CONFIG_KASAN_INLINE enabled [ 24.222907] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 24.240903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.250226] task: ffff8801c3626000 task.stack: ffff8801bf830000 [ 24.256250] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 24.264491] RSP: 0018:ffff8801bf837950 EFLAGS: 00010a07 [ 24.269909] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826687fb [ 24.277152] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 24.284391] RBP: ffff8801bf837960 R08: 0000000000000001 R09: 0000000000000000 [ 24.291630] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 24.298869] R13: 0000000000000020 R14: ffff8801c0374200 R15: dffffc0000000000 [ 24.306111] FS: 00007fbebb1d9700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 24.314305] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.320155] CR2: 0000000020ef0fe0 CR3: 00000001c752e000 CR4: 0000000000160670 [ 24.327402] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.334641] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.341881] Stack: [ 24.344000] ffff8801c3626000 ffff8801c0374358 ffff8801bf8379c0 ffffffff82668821 [ 24.351977] ffff8801c0374370 ffffed003806e86b ffffed003806e86e ffff8801c0374368 [ 24.359958] dead4ead00000000 ffff8801c0374340 0000000000000000 0000000000000000 [ 24.367959] Call Trace: [ 24.370517] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 24.376979] [] sg_finish_rem_req+0x2b5/0x340 [ 24.383006] [] sg_new_read.isra.20+0x39/0x3e0 [ 24.389119] [] ? sg_get_rq_mark+0x142/0x190 [ 24.395408] [] sg_read+0x8b7/0x1440 [ 24.400654] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 24.407289] [] ? fsnotify+0xf30/0xf30 [ 24.413368] [] ? avc_policy_seqno+0x9/0x20 [ 24.419227] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 24.426209] [] ? security_file_permission+0x89/0x1e0 [ 24.432934] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 24.439569] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 24.446205] [] do_readv_writev+0x520/0x750 [ 24.452059] [] ? vfs_write+0x530/0x530 [ 24.457566] [] ? exit_robust_list+0x230/0x230 [ 24.463682] [] ? __fget+0x20a/0x3b0 [ 24.468931] [] ? __fget+0x231/0x3b0 [ 24.474178] [] ? __fget+0x47/0x3b0 [ 24.479337] [] vfs_readv+0x84/0xc0 [ 24.484497] [] do_readv+0xe6/0x250 [ 24.489658] [] ? vfs_readv+0xc0/0xc0 [ 24.494995] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 24.501285] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 24.508094] [] SyS_readv+0x27/0x30 [ 24.513255] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 24.519805] [] do_syscall_64+0x1a4/0x490 [ 24.525486] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 24.532381] 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 [ 24.559083] RIP [] __free_pages+0x21/0x80 [ 24.564971] RSP [ 24.568578] general protection fault: 0000 [#2] PREEMPT SMP KASAN [ 24.569219] ---[ end trace fc7b2306711b0d50 ]--- [ 24.569223] Kernel panic - not syncing: Fatal exception [ 24.584849] Dumping ftrace buffer: [ 24.588366] (ftrace buffer empty) [ 24.592051] Modules linked in: [ 24.595339] CPU: 1 PID: 3659 Comm: syzkaller951887 Tainted: G D 4.9.83-gda9fb78 #40 [ 24.604233] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.613559] task: ffff8801c3623000 task.stack: ffff8801c0248000 [ 24.619586] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 24.627829] RSP: 0018:ffff8801c024f950 EFLAGS: 00010a07 [ 24.633251] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826687fb [ 24.640494] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 24.647740] RBP: ffff8801c024f960 R08: 0000000000000001 R09: 0000000000000000 [ 24.654982] R10: 0000000000000000 R11: ffff8801c3623000 R12: 0000000000000004 [ 24.662225] R13: 0000000000000020 R14: ffff8801c0b00000 R15: dffffc0000000000 [ 24.669469] FS: 00007fbebb1fa700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 24.677666] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.683522] CR2: 00007fbebb1d8e78 CR3: 00000001c752e000 CR4: 0000000000160670 [ 24.690766] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.698008] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.705249] Stack: [ 24.707372] ffff8801c3623000 ffff8801c0b00158 ffff8801c024f9c0 ffffffff82668821 [ 24.715361] ffff8801c0b00170 ffffed003816002b ffffed003816002e ffff8801c0b00168 [ 24.723352] dead4ead00000000 ffff8801c0b00140 0000000000000000 0000000000000000 [ 24.731341] Call Trace: [ 24.733906] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 24.740375] [] sg_finish_rem_req+0x2b5/0x340 [ 24.746406] [] sg_new_read.isra.20+0x39/0x3e0 [ 24.752524] [] ? sg_get_rq_mark+0x142/0x190 [ 24.758467] [] sg_read+0x8b7/0x1440 [ 24.763717] [] ? __check_object_size+0x174/0x3a9 [ 24.770095] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 24.776747] [] ? fsnotify+0xf30/0xf30 [ 24.782175] [] ? avc_policy_seqno+0x9/0x20 [ 24.788033] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 24.795027] [] ? security_file_permission+0x89/0x1e0 [ 24.801751] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 24.808391] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 24.815031] [] do_readv_writev+0x520/0x750 [ 24.820892] [] ? vfs_write+0x530/0x530 [ 24.826406] [] ? exit_robust_list+0x230/0x230 [ 24.832527] [] ? __fget+0x47/0x3b0 [ 24.837688] [] ? __fget+0x20a/0x3b0 [ 24.842936] [] ? __fget+0x231/0x3b0 [ 24.848190] [] ? __fget+0x47/0x3b0 [ 24.853353] [] vfs_readv+0x84/0xc0 [ 24.858518] [] do_readv+0xe6/0x250 [ 24.863679] [] ? vfs_readv+0xc0/0xc0 [ 24.869016] [] ? SyS_read+0x1b0/0x1b0 [ 24.874438] [] SyS_readv+0x27/0x30 [ 24.879602] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 24.886163] [] do_syscall_64+0x1a4/0x490 [ 24.891856] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 24.898754] 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 [ 24.925578] RIP [] __free_pages+0x21/0x80 [ 24.931469] RSP [ 24.935562] Dumping ftrace buffer: [ 24.939078] (ftrace buffer empty) [ 24.942755] Kernel Offset: disabled [ 24.946356] Rebooting in 86400 seconds..