[....] Starting enhanced syslogd: rsyslogd[ 10.385042] audit: type=1400 audit(1514611160.111:4): avc: denied { syslog } for pid=3172 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 '10.128.0.43' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.451221] kasan: CONFIG_KASAN_INLINE enabled [ 39.451890] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 39.452854] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.453673] Dumping ftrace buffer: [ 39.454145] (ftrace buffer empty) [ 39.454638] Modules linked in: [ 39.455102] CPU: 0 PID: 3342 Comm: syzkaller597917 Not tainted 4.9.73-gf3f3457 #11 [ 39.456107] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.457340] task: ffff8801cbd33000 task.stack: ffff8801c8dd8000 [ 39.458137] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 39.459256] RSP: 0018:ffff8801c8ddf940 EFLAGS: 00010a07 [ 39.459972] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 39.460923] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 39.461900] RBP: ffff8801c8ddf950 R08: 0000000000000001 R09: 0000000000000000 [ 39.462885] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 39.463834] R13: 0000000000000020 R14: ffff8801c8c6c200 R15: dffffc0000000000 [ 39.464800] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008c00840 [ 39.465871] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.466642] CR2: 0000000020002000 CR3: 00000001cc75a000 CR4: 00000000001406f0 [ 39.467595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.468544] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.469492] Stack: [ 39.469785] ffff8801cbd33000 ffff8801c8c6c358 ffff8801c8ddf9b0 ffffffff82664fc1 [ 39.470915] ffff8801c8c6c370 ffffed003918d86b ffffed003918d86e ffff8801c8c6c368 [ 39.476363] dead4ead00000000 ffff8801c8c6c340 0000000000000000 0000000000000000 [ 39.484311] Call Trace: [ 39.486864] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 39.493320] [] sg_finish_rem_req+0x2b5/0x340 [ 39.499341] [] sg_new_read.isra.20+0x39/0x3e0 [ 39.505446] [] ? sg_get_rq_mark+0x142/0x190 [ 39.511388] [] sg_read+0x8bd/0x1440 [ 39.516626] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 39.523257] [] ? fsnotify+0xf30/0xf30 [ 39.528675] [] ? avc_policy_seqno+0x9/0x20 [ 39.534528] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 39.541504] [] ? security_file_permission+0x89/0x1e0 [ 39.548219] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 39.554847] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 39.561478] [] compat_do_readv_writev+0x522/0x760 [ 39.567943] [] ? do_pwritev+0x1a0/0x1a0 [ 39.573533] [] ? sg_ioctl+0x2c30/0x2c30 [ 39.579119] [] ? do_iter_readv_writev+0x400/0x400 [ 39.585576] [] ? __might_sleep+0x95/0x1a0 [ 39.591339] [] ? __inode_security_revalidate+0xd9/0x130 [ 39.598319] [] ? __fsnotify_parent+0xbc/0x340 [ 39.604427] [] ? avc_policy_seqno+0x9/0x20 [ 39.610273] [] ? fsnotify+0x86/0xf30 [ 39.615600] [] ? fsnotify+0xf30/0xf30 [ 39.621013] [] compat_readv+0xe3/0x150 [ 39.626512] [] do_compat_readv+0xf4/0x1d0 [ 39.632271] [] ? compat_readv+0x150/0x150 [ 39.638030] [] ? SyS_read+0x1b0/0x1b0 [ 39.643442] [] compat_SyS_readv+0x26/0x30 [ 39.649203] [] ? SyS_pwritev2+0x80/0x80 [ 39.654792] [] do_fast_syscall_32+0x2f7/0x890 [ 39.660899] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.667530] [] entry_SYSENTER_compat+0x51/0x60 [ 39.673720] 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 [ 39.699992] RIP [] __free_pages+0x21/0x80 [ 39.705866] RSP [ 39.709707] ---[ end trace d0eadac8d265c340 ]--- [ 39.714558] Kernel panic - not syncing: Fatal exception [ 39.720239] Dumping ftrace buffer: [ 39.723744] (ftrace buffer empty) [ 39.727421] Kernel Offset: disabled [ 39.731011] Rebooting in 86400 seconds..