[....] Starting enhanced syslogd: rsyslogd[ 16.477159] audit: type=1400 audit(1521319647.255:5): avc: denied { syslog } for pid=4082 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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: [ 22.827558] audit: type=1400 audit(1521319653.606:6): avc: denied { map } for pid=4222 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 '10.128.0.30' (ECDSA) to the list of known hosts. executing program [ 35.147451] audit: type=1400 audit(1521319665.926:7): avc: denied { map } for pid=4238 comm="syzkaller947936" path="/root/syzkaller947936310" 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 [ 35.157833] kasan: CONFIG_KASAN_INLINE enabled [ 35.178108] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 35.185477] general protection fault: 0000 [#1] SMP KASAN [ 35.190986] Dumping ftrace buffer: [ 35.194493] (ftrace buffer empty) [ 35.198174] Modules linked in: [ 35.201340] CPU: 0 PID: 4239 Comm: syzkaller947936 Not tainted 4.16.0-rc5+ #357 [ 35.208754] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.218091] RIP: 0010:rdma_join_multicast+0x46d/0x3bb0 [ 35.223335] RSP: 0018:ffff8801b0fff4f0 EFLAGS: 00010202 [ 35.228666] RAX: 0000000000000000 RBX: ffff8801b5b43100 RCX: 0000000000000029 [ 35.235907] RDX: dffffc0000000000 RSI: 0000000000000002 RDI: 0000000000000148 [ 35.243144] RBP: ffff8801b0fff7f0 R08: 0000000000000000 R09: 1ffff100361ffe7c [ 35.250381] R10: ffff8801b0fff3a8 R11: 0000000000000001 R12: ffff8801afe74940 [ 35.257620] R13: ffff8801b5b431ad R14: 0000000000000000 R15: ffff8801afe74b40 [ 35.264861] FS: 00000000011b3880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.273057] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.278908] CR2: 00000000006cc0a0 CR3: 00000001aef74004 CR4: 00000000001606f0 [ 35.286166] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.293406] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.300645] Call Trace: [ 35.303206] ? find_held_lock+0x35/0x1d0 [ 35.307248] ? rdma_resolve_route+0x2010/0x2010 [ 35.311890] ? __radix_tree_replace+0x1af/0x310 [ 35.316531] ? node_tag_clear+0xf2/0x180 [ 35.320564] ? radix_tree_iter_tag_clear+0x97/0xd0 [ 35.325464] ? __mutex_unlock_slowpath+0xe9/0xac0 [ 35.330276] ? wait_for_completion+0x770/0x770 [ 35.334835] ? idr_alloc+0x127/0x180 [ 35.338528] ucma_process_join+0x4da/0xa90 [ 35.342731] ? ucma_process_join+0x4da/0xa90 [ 35.347110] ? ucma_set_option+0x520/0x520 [ 35.351320] ? __might_sleep+0x95/0x190 [ 35.355268] ? kasan_check_write+0x14/0x20 [ 35.359478] ucma_join_ip_multicast+0x274/0x3b0 [ 35.364116] ? ucma_join_multicast+0x110/0x110 [ 35.368671] ? check_same_owner+0x320/0x320 [ 35.372979] ? __might_sleep+0x95/0x190 [ 35.376927] ? kasan_check_write+0x14/0x20 [ 35.381133] ucma_write+0x2d6/0x3d0 [ 35.384732] ? ucma_join_multicast+0x110/0x110 [ 35.389281] ? ucma_resolve_route+0x1a0/0x1a0 [ 35.393746] ? handle_mm_fault+0x35b/0xb10 [ 35.397950] ? ucma_resolve_route+0x1a0/0x1a0 [ 35.402414] __vfs_write+0xef/0x970 [ 35.406012] ? rcu_note_context_switch+0x710/0x710 [ 35.410909] ? kernel_read+0x120/0x120 [ 35.414766] ? __might_sleep+0x95/0x190 [ 35.418718] ? _cond_resched+0x14/0x30 [ 35.422575] ? __inode_security_revalidate+0xd9/0x130 [ 35.427736] ? avc_policy_seqno+0x9/0x20 [ 35.431771] ? selinux_file_permission+0x82/0x460 [ 35.436592] ? security_file_permission+0x89/0x1e0 [ 35.441491] ? rw_verify_area+0xe5/0x2b0 [ 35.445523] ? __fdget_raw+0x20/0x20 [ 35.449206] vfs_write+0x189/0x510 [ 35.452715] SyS_write+0xef/0x220 [ 35.456136] ? exit_to_usermode_loop+0x198/0x2f0 [ 35.460861] ? SyS_read+0x220/0x220 [ 35.464459] ? do_syscall_64+0xb7/0x940 [ 35.468402] ? SyS_read+0x220/0x220 [ 35.471996] do_syscall_64+0x281/0x940 [ 35.475854] ? __do_page_fault+0xc90/0xc90 [ 35.480055] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 35.484784] ? syscall_return_slowpath+0x550/0x550 [ 35.489682] ? syscall_return_slowpath+0x2ac/0x550 [ 35.494580] ? prepare_exit_to_usermode+0x350/0x350 [ 35.499565] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 35.504897] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.509710] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 35.514867] RIP: 0033:0x441639 [ 35.518026] RSP: 002b:00007ffea1c44eb8 EFLAGS: 00000207 ORIG_RAX: 0000000000000001 [ 35.525701] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441639 [ 35.532950] RDX: 0000000000000038 RSI: 00000000200003c0 RDI: 0000000000000003 [ 35.540200] RBP: 0000000000000003 R08: 000000a800000000 R09: 000000a800000000 [ 35.547438] R10: 000000a800000000 R11: 0000000000000207 R12: 0000000000000000 [ 35.554676] R13: 00000000006cd448 R14: 0000000000000000 R15: 0000000000000000 [ 35.561922] Code: 00 48 c1 ea 03 80 3c 02 00 0f 85 d7 34 00 00 49 8b 04 24 48 ba 00 00 00 00 00 fc ff df 48 8d b8 48 01 00 00 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 f5 35 00 00 49 c1 e6 04 4c 03 b0 48 01 00 00 [ 35.581007] RIP: rdma_join_multicast+0x46d/0x3bb0 RSP: ffff8801b0fff4f0 [ 35.587793] ---[ end trace ce423934f80d79e7 ]--- [ 35.592528] Kernel panic - not syncing: Fatal exception [ 35.598204] Dumping ftrace buffer: [ 35.601713] (ftrace buffer empty) [ 35.605395] Kernel Offset: disabled [ 35.608993] Rebooting in 86400 seconds..