[....] Starting enhanced syslogd: rsyslogd[ 10.575428] audit: type=1400 audit(1514760140.289:4): avc: denied { syslog } for pid=3164 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 '10.128.15.217' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz4.accept_dad = 0 net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz3.router_solicitations = 0 net.ipv6.conf.syz4.router_solicitations = 0 net.ipv6.conf.syz1.router_solicitations = 0 net.ipv6.conf.syz2.router_solicitations = 0 net.ipv6.conf.syz7.router_solicitations = 0 net.ipv6.conf.syz6.router_solicitations = 0 net.ipv6.conf.syz5.router_solicitations = 0 executing program executing program executing program syzkaller login: [ 20.099171] sg_write: data in/out 327644/100 bytes for SCSI command 0x0-- guessing data in; [ 20.099171] program syzkaller405131 not setting count and/or reply_len properly executing program [ 20.129542] sg_write: data in/out 327644/100 bytes for SCSI command 0x0-- guessing data in; [ 20.129542] program syzkaller405131 not setting count and/or reply_len properly [ 20.151623] kasan: CONFIG_KASAN_INLINE enabled [ 20.151626] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 20.151634] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 20.151639] Dumping ftrace buffer: [ 20.151642] (ftrace buffer empty) [ 20.151646] Modules linked in: [ 20.151653] CPU: 1 PID: 3505 Comm: syzkaller405131 Not tainted 4.9.73-gf3f3457 #11 [ 20.151656] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.151660] task: ffff8801c4df0000 task.stack: ffff8801bff30000 [ 20.151675] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 20.151679] RSP: 0018:ffff8801bff37aa0 EFLAGS: 00010a07 [ 20.151682] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 20.151686] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 20.151690] RBP: ffff8801bff37ab0 R08: ffffed003a383384 R09: ffff8801d1c19c00 [ 20.151693] R10: 0000000000000005 R11: ffffed003a383384 R12: 0000000000000004 [ 20.151696] R13: 0000000000000020 R14: ffff8801c3d18000 R15: dffffc0000000000 [ 20.151702] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f76eab40 [ 20.151705] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 20.151709] CR2: 0000000008100898 CR3: 00000001c54a1000 CR4: 00000000001406e0 [ 20.151714] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.151717] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.151719] Stack: [ 20.151728] 0000000000000000 ffff8801c3d18158 ffff8801bff37b10 ffffffff82664fc1 [ 20.151737] ffff8801c3d18170 ffffed00387a302b ffffed00387a302e ffff8801c3d18168 [ 20.151745] dead4ead00000000 ffff8801c3d18140 0000000000000000 0000000000000000 [ 20.151747] Call Trace: [ 20.151756] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 20.151762] [] sg_finish_rem_req+0x2b5/0x340 [ 20.151768] [] sg_read+0xa1c/0x1440 [ 20.151775] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.151785] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 20.151791] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.151798] [] __vfs_read+0x103/0x670 [ 20.151804] [] ? default_llseek+0x290/0x290 [ 20.151811] [] ? fsnotify+0x86/0xf30 [ 20.151817] [] ? fsnotify+0xf30/0xf30 [ 20.151825] [] ? avc_policy_seqno+0x9/0x20 [ 20.151833] [] ? selinux_file_permission+0x82/0x460 [ 20.151840] [] ? security_file_permission+0x89/0x1e0 [ 20.151847] [] ? rw_verify_area+0xe5/0x2b0 [ 20.151853] [] vfs_read+0x11e/0x380 [ 20.151860] [] SyS_read+0xd9/0x1b0 [ 20.151867] [] ? vfs_copy_file_range+0x740/0x740 [ 20.151875] [] ? do_fast_syscall_32+0xcf/0x890 [ 20.151882] [] ? vfs_copy_file_range+0x740/0x740 [ 20.151887] [] do_fast_syscall_32+0x2f7/0x890 [ 20.151893] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.151901] [] entry_SYSENTER_compat+0x51/0x60 [ 20.151992] 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 [ 20.151999] RIP [] __free_pages+0x21/0x80 [ 20.152001] RSP [ 20.154252] ---[ end trace e6a7c1824d6442b2 ]--- [ 20.154257] Kernel panic - not syncing: Fatal exception [ 20.154650] Dumping ftrace buffer: [ 20.154652] (ftrace buffer empty) [ 20.154654] Kernel Offset: disabled [ 20.505401] Rebooting in 86400 seconds..