[....] Starting enhanced syslogd: rsyslogd[ 12.054712] audit: type=1400 audit(1518618592.361:4): avc: denied { syslog } for pid=3523 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 '10.128.15.200' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 32.423455] kasan: CONFIG_KASAN_INLINE enabled [ 32.428114] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 32.435500] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.441708] Dumping ftrace buffer: [ 32.445219] (ftrace buffer empty) [ 32.448912] Modules linked in: [ 32.452193] CPU: 1 PID: 3681 Comm: syzkaller606694 Not tainted 4.9.81-g1a93831 #33 [ 32.460303] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.469637] task: ffff8801bf9f0000 task.stack: ffff8801d8948000 [ 32.475662] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 32.483899] RSP: 0018:ffff8801d894f950 EFLAGS: 00010a07 [ 32.489319] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266848b [ 32.496559] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 32.503806] RBP: ffff8801d894f960 R08: 0000000000000001 R09: 0000000000000000 [ 32.512181] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 32.519452] R13: 0000000000000020 R14: ffff8801d9738000 R15: dffffc0000000000 [ 32.526699] FS: 0000000001979880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.534905] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.540758] CR2: 00000000208c0000 CR3: 00000001bfb74000 CR4: 0000000000160670 [ 32.548003] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.555257] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.562505] Stack: [ 32.564625] ffff8801bf9f0000 ffff8801d9738158 ffff8801d894f9c0 ffffffff826684b1 [ 32.572594] ffff8801d9738170 ffffed003b2e702b ffffed003b2e702e ffff8801d9738168 [ 32.580568] dead4ead00000000 ffff8801d9738140 0000000000000000 0000000000000000 [ 32.588547] Call Trace: [ 32.591111] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 32.597663] [] sg_finish_rem_req+0x2b5/0x340 [ 32.603702] [] sg_new_read.isra.20+0x39/0x3e0 [ 32.609828] [] ? sg_get_rq_mark+0x142/0x190 [ 32.615769] [] sg_read+0x8b7/0x1440 [ 32.621024] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 32.627666] [] ? fsnotify+0xf30/0xf30 [ 32.633086] [] ? avc_policy_seqno+0x9/0x20 [ 32.638954] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 32.645951] [] ? security_file_permission+0x89/0x1e0 [ 32.652687] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 32.659334] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 32.665980] [] do_readv_writev+0x520/0x750 [ 32.671846] [] ? vfs_write+0x530/0x530 [ 32.677357] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.683303] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 32.690372] [] ? __pmd_alloc+0x410/0x410 [ 32.696055] [] ? avc_policy_seqno+0x9/0x20 [ 32.702691] [] vfs_readv+0x84/0xc0 [ 32.707853] [] do_readv+0xe6/0x250 [ 32.713017] [] ? vfs_readv+0xc0/0xc0 [ 32.718353] [] SyS_readv+0x27/0x30 [ 32.723515] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 32.730075] [] do_syscall_64+0x1a5/0x490 [ 32.735757] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 32.742661] 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 [ 32.769271] RIP [] __free_pages+0x21/0x80 [ 32.775154] RSP [ 32.778964] ---[ end trace c83e805bc7842028 ]--- [ 32.783693] Kernel panic - not syncing: Fatal exception [ 32.789430] Dumping ftrace buffer: [ 32.792944] (ftrace buffer empty) [ 32.796630] Kernel Offset: disabled [ 32.800225] Rebooting in 86400 seconds..