[....] Starting enhanced syslogd: rsyslogd[ 17.067647] audit: type=1400 audit(1520530817.148:5): avc: denied { syslog } for pid=4085 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 syzkaller login: [ 22.239931] audit: type=1400 audit(1520530822.320:6): avc: denied { map } for pid=4223 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.57' (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 [ 48.216510] audit: type=1400 audit(1520530848.297:7): avc: denied { map } for pid=4239 comm="syzkaller154615" path="/root/syzkaller154615024" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 48.249457] kasan: CONFIG_KASAN_INLINE enabled [ 48.254242] kasan: GPF could be caused by NULL-ptr deref or user memory access 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 [ 48.261607] general protection fault: 0000 [#1] SMP KASAN [ 48.267118] Dumping ftrace buffer: [ 48.270625] (ftrace buffer empty) [ 48.274305] Modules linked in: [ 48.277475] CPU: 1 PID: 4256 Comm: syzkaller154615 Not tainted 4.16.0-rc4+ #346 [ 48.284887] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.294219] RIP: 0010:ucma_accept+0x4eb/0x970 [ 48.298680] RSP: 0018:ffff8801b9a4f8c8 EFLAGS: 00010202 [ 48.304009] RAX: ffff8801af1ec400 RBX: ffff8801b9a4f948 RCX: dffffc0000000000 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 [ 48.311249] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000020 [ 48.318487] RBP: ffff8801b9a4fad0 R08: 0000000000000000 R09: 1ffff10037349f23 [ 48.325725] R10: ffffffff88613380 R11: 0000000000000000 R12: ffff8801b9a4f908 [ 48.332966] R13: ffff8801b9a4faa8 R14: ffff8801aeba3a00 R15: ffff8801afa34c00 [ 48.340208] FS: 00007f8d6f239700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 48.348405] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.354254] CR2: 00007f8d6f238e78 CR3: 00000001b0505006 CR4: 00000000001606e0 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 [ 48.361494] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.368734] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.375974] Call Trace: [ 48.378532] ? ucma_reject+0x220/0x220 [ 48.382409] ? kasan_check_write+0x14/0x20 [ 48.386616] ucma_write+0x2d6/0x3d0 [ 48.390212] ? ucma_reject+0x220/0x220 [ 48.394068] ? ucma_resolve_route+0x1a0/0x1a0 [ 48.398538] ? ucma_resolve_route+0x1a0/0x1a0 [ 48.403095] __vfs_write+0xef/0x970 [ 48.406694] ? rcu_note_context_switch+0x710/0x710 [ 48.411595] ? kernel_read+0x120/0x120 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 [ 48.415451] ? __might_sleep+0x95/0x190 [ 48.419398] ? _cond_resched+0x14/0x30 [ 48.423257] ? __inode_security_revalidate+0xd9/0x130 [ 48.428417] ? avc_policy_seqno+0x9/0x20 [ 48.432449] ? selinux_file_permission+0x82/0x460 [ 48.437263] ? security_file_permission+0x89/0x1e0 [ 48.442164] ? rw_verify_area+0xe5/0x2b0 [ 48.446193] ? __fdget_raw+0x20/0x20 [ 48.449874] vfs_write+0x189/0x510 [ 48.453384] SyS_write+0xef/0x220 [ 48.456805] ? filp_open+0x70/0x70 [ 48.460314] ? SyS_read+0x220/0x220 [ 48.463912] ? do_syscall_64+0xb7/0x940 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 [ 48.467855] ? SyS_read+0x220/0x220 [ 48.471452] do_syscall_64+0x281/0x940 [ 48.475310] ? _raw_spin_unlock_irq+0x27/0x70 [ 48.479772] ? finish_task_switch+0x1c1/0x7e0 [ 48.484236] ? syscall_return_slowpath+0x550/0x550 [ 48.489132] ? syscall_return_slowpath+0x2ac/0x550 [ 48.494033] ? prepare_exit_to_usermode+0x350/0x350 [ 48.499021] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 48.504358] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.509172] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 48.514332] RIP: 0033:0x445ae9 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 [ 48.517490] RSP: 002b:00007f8d6f238da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 48.525164] RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 0000000000445ae9 [ 48.532404] RDX: 0000000000000128 RSI: 0000000020000780 RDI: 0000000000000003 [ 48.539645] RBP: 00000000006dac38 R08: 0000000000000000 R09: 0000000000000000 [ 48.546884] R10: 0000000000000000 R11: 0000000000000246 R12: 006d635f616d6472 [ 48.554124] R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 0000000000000004 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 [ 48.561377] Code: 0c 09 84 c9 74 09 80 f9 03 0f 8e 4a 02 00 00 49 8d 78 20 41 89 b5 70 fe ff ff 48 b9 00 00 00 00 00 fc ff df 48 89 fe 48 c1 ee 03 <0f> b6 34 0e 48 89 f9 83 e1 07 83 c1 01 40 38 f1 7c 09 40 84 f6 [ 48.580440] RIP: ucma_accept+0x4eb/0x970 RSP: ffff8801b9a4f8c8 [ 48.586408] ---[ end trace efb43dccceaff67b ]--- [ 48.591140] Kernel panic - not syncing: Fatal exception [ 48.596802] Dumping ftrace buffer: [ 48.600310] (ftrace buffer empty) [ 48.603990] Kernel Offset: disabled [ 48.607590] Rebooting in 86400 seconds..