[....] Starting enhanced syslogd: rsyslogd[ 13.114995] audit: type=1400 audit(1520835745.892:4): avc: denied { syslog } for pid=3655 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 '10.128.10.11' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 26.581826] kasan: CONFIG_KASAN_INLINE enabled [ 26.583240] kasan: CONFIG_KASAN_INLINE enabled [ 26.583243] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.583251] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.583255] Dumping ftrace buffer: [ 26.583258] (ftrace buffer empty) [ 26.583262] Modules linked in: [ 26.583268] CPU: 1 PID: 3817 Comm: syzkaller490466 Not tainted 4.9.87-ga290494 #53 [ 26.583271] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.583275] task: ffff8801d7e09800 task.stack: ffff8801d7ef0000 [ 26.583289] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.583293] RSP: 0018:ffff8801d7ef7940 EFLAGS: 00010a07 [ 26.583297] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826692ab [ 26.583300] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 26.583304] RBP: ffff8801d7ef7950 R08: 0000000048000000 R09: 0000000000001e30 [ 26.583307] R10: 0000000000002100 R11: ffff8801d7e09800 R12: 0000000000000004 [ 26.583311] R13: 0000000000000020 R14: ffff8801d838a100 R15: dffffc0000000000 [ 26.583316] FS: 0000000001103940(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.583320] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.583323] CR2: 000000002085dff0 CR3: 00000001da3e6000 CR4: 0000000000160670 [ 26.583330] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.583333] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.583334] Stack: [ 26.583344] 0000000000000001 ffff8801d838a258 ffff8801d7ef79b0 ffffffff826692d1 [ 26.583352] ffff8801d838a270 ffffed003b07144b ffffed003b07144e ffff8801d838a268 [ 26.583360] dead4ead00000000 ffff8801d838a240 0000000000000000 0000000000000000 [ 26.583361] Call Trace: [ 26.583370] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 26.583377] [] sg_finish_rem_req+0x2b5/0x340 [ 26.583383] [] sg_new_read.isra.20+0x18d/0x3e0 [ 26.583389] [] sg_read+0x8b7/0x1440 [ 26.583396] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.583402] [] ? fsnotify+0x86/0xf30 [ 26.583408] [] ? fsnotify+0xf30/0xf30 [ 26.583415] [] ? avc_policy_seqno+0x9/0x20 [ 26.583424] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 26.583431] [] do_readv_writev+0x5fd/0x740 [ 26.583438] [] ? vfs_write+0x530/0x530 [ 26.583445] [] ? _raw_spin_unlock+0x2c/0x50 [ 26.583454] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 26.583460] [] ? handle_mm_fault+0x4c1/0x2470 [ 26.583466] [] ? __pmd_alloc+0x410/0x410 [ 26.583472] [] ? avc_policy_seqno+0x9/0x20 [ 26.583479] [] vfs_readv+0x84/0xc0 [ 26.583485] [] do_readv+0xe6/0x250 [ 26.583491] [] ? vfs_readv+0xc0/0xc0 [ 26.583498] [] SyS_readv+0x27/0x30 [ 26.583505] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 26.583511] [] do_syscall_64+0x1a4/0x490 [ 26.583518] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.583619] 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 [ 26.583626] RIP [] __free_pages+0x21/0x80 [ 26.583628] RSP [ 26.583635] ---[ end trace 00fd0519c4d35a34 ]--- [ 26.583639] Kernel panic - not syncing: Fatal exception [ 26.586828] Dumping ftrace buffer: [ 26.586830] (ftrace buffer empty) [ 26.586832] Kernel Offset: disabled [ 26.935763] Rebooting in 86400 seconds..