[....] Starting enhanced syslogd: rsyslogd[ 14.849493] audit: type=1400 audit(1520345846.234:4): avc: denied { syslog } for pid=3619 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 '10.128.0.52' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.640040] kasan: CONFIG_KASAN_INLINE enabled [ 26.644726] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.652058] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.658258] Dumping ftrace buffer: [ 26.661775] (ftrace buffer empty) [ 26.665456] Modules linked in: [ 26.668735] CPU: 1 PID: 3776 Comm: syzkaller648038 Not tainted 4.9.86-gb324a70 #50 [ 26.676408] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.685734] task: ffff8801b6421800 task.stack: ffff8801d8390000 [ 26.691756] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.699988] RSP: 0018:ffff8801d8397940 EFLAGS: 00010a07 [ 26.705404] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668edb [ 26.712647] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 26.719886] RBP: ffff8801d8397950 R08: 0000000048000000 R09: 0000000000001e30 [ 26.727125] R10: 0000000000002100 R11: ffff8801b6421800 R12: 0000000000000004 [ 26.734370] R13: 0000000000000020 R14: ffff8801d7e12100 R15: dffffc0000000000 [ 26.741614] FS: 00007f2b2a374700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.749807] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.755656] CR2: 00007f2b2a373e78 CR3: 00000001da350000 CR4: 0000000000160670 [ 26.762896] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.770134] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.777370] Stack: [ 26.779488] 0000000000000001 ffff8801d7e12258 ffff8801d83979b0 ffffffff82668f01 [ 26.787460] ffff8801d7e12270 ffffed003afc244b ffffed003afc244e ffff8801d7e12268 [ 26.795430] dead4ead00000000 ffff8801d7e12240 0000000000000000 0000000000000000 [ 26.803394] Call Trace: [ 26.805953] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 26.812416] [] sg_finish_rem_req+0x2b5/0x340 [ 26.818441] [] sg_new_read.isra.20+0x18d/0x3e0 [ 26.824641] [] sg_read+0x8b7/0x1440 [ 26.829884] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.836519] [] ? fsnotify+0x86/0xf30 [ 26.841850] [] ? fsnotify+0xf30/0xf30 [ 26.847268] [] ? avc_policy_seqno+0x9/0x20 [ 26.853120] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 26.860014] [] do_readv_writev+0x5fd/0x740 [ 26.865869] [] ? vfs_write+0x530/0x530 [ 26.871375] [] ? __fget+0x20a/0x3b0 [ 26.876621] [] ? __fget+0x231/0x3b0 [ 26.881865] [] ? __fget+0x47/0x3b0 [ 26.887024] [] vfs_readv+0x84/0xc0 [ 26.892180] [] do_readv+0xe6/0x250 [ 26.897338] [] ? vfs_readv+0xc0/0xc0 [ 26.902671] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 26.908958] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 26.915769] [] SyS_readv+0x27/0x30 [ 26.920930] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 26.927484] [] do_syscall_64+0x1a4/0x490 [ 26.933179] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.940070] 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 [ 26.966645] RIP [] __free_pages+0x21/0x80 [ 26.972532] RSP [ 26.976547] ---[ end trace 3d10ba0891e4120f ]--- [ 26.981288] Kernel panic - not syncing: Fatal exception [ 26.986972] Dumping ftrace buffer: [ 26.990484] (ftrace buffer empty) [ 26.994163] Kernel Offset: disabled [ 26.997759] Rebooting in 86400 seconds..