[ 12.313924] rsyslogd (2988) used greatest stack depth: 14520 bytes left [?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: [ 20.825465] audit: type=1400 audit(1512874163.045:6): avc: denied { map } for pid=3140 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 'ci-upstream-next-kasan-gce-4,10.128.0.38' (ECDSA) to the list of known hosts. executing program [ 27.126354] audit: type=1400 audit(1512874169.346:7): avc: denied { map } for pid=3154 comm="syzkaller359763" path="/root/syzkaller359763756" 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 [ 27.153968] kasan: CONFIG_KASAN_INLINE enabled [ 27.158580] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.165942] general protection fault: 0000 [#1] SMP KASAN [ 27.171455] Dumping ftrace buffer: [ 27.174959] (ftrace buffer empty) [ 27.178631] Modules linked in: [ 27.181790] CPU: 0 PID: 3154 Comm: syzkaller359763 Not tainted 4.15.0-rc2-next-20171208+ #63 [ 27.190324] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.199645] RIP: 0010:page_mapping+0xa4/0x530 [ 27.204101] RSP: 0018:ffff8801c53ff320 EFLAGS: 00010202 [ 27.209427] RAX: 0000000000000004 RBX: 1ffff10038a7fe65 RCX: ffffffff81950bad [ 27.216662] RDX: 0000000000000000 RSI: 1ffff10038a7ff03 RDI: 0000000000000000 [ 27.223895] RBP: ffff8801c53ff470 R08: ffffed0038828fac R09: ffff8801c4147d40 [ 27.231128] R10: ffff8801d12df818 R11: ffffed0038828fab R12: 0000000000000000 [ 27.238360] R13: ffff8801c53ff448 R14: dffffc0000000000 R15: 0000000000000020 [ 27.245594] FS: 000000000250e880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.253782] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.259627] CR2: 0000000020a23000 CR3: 00000001c52eb000 CR4: 00000000001406f0 [ 27.266860] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.274097] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.281330] Call Trace: [ 27.283884] ? kstrndup+0xd0/0xd0 [ 27.287310] ? lock_downgrade+0x980/0x980 [ 27.291425] ? trace_hardirqs_off+0xd/0x10 [ 27.295623] ? _raw_spin_unlock_irqrestore+0xa6/0xba [ 27.300693] set_page_dirty+0xb9/0x5d0 [ 27.304546] ? __writepage+0xc0/0xc0 [ 27.308225] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.313204] ? trace_hardirqs_on+0xd/0x10 [ 27.317325] ? __rds_conn_create+0x376/0x17f0 [ 27.321791] ? rds_conn_message_info_send+0x30/0x30 [ 27.326772] rds_atomic_free_op+0xc2/0x330 [ 27.330973] ? rds_rdma_free_op+0x500/0x500 [ 27.335258] ? refcount_sub_and_test+0x115/0x1b0 [ 27.339976] ? refcount_inc+0x50/0x50 [ 27.343744] rds_message_put+0x53c/0x6b0 [ 27.347770] ? kfree+0x1e7/0x250 [ 27.351102] ? rds_message_add_rdma_dest_extension+0x170/0x170 [ 27.357038] ? rds_cmsg_rdma_map+0xb0/0xb0 [ 27.361237] ? trace_hardirqs_on+0xd/0x10 [ 27.365350] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.369724] ? __release_sock+0x360/0x360 [ 27.373831] ? lock_sock_nested+0x91/0x110 [ 27.378031] ? rds_conn_create_outgoing+0x3f/0x50 [ 27.382837] rds_sendmsg+0x14ee/0x1f90 [ 27.386696] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.391161] ? sock_has_perm+0x29c/0x400 [ 27.395189] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 27.400515] ? lock_release+0xda0/0xda0 [ 27.404458] ? selinux_socket_sendmsg+0x36/0x40 [ 27.409091] ? security_socket_sendmsg+0x89/0xb0 [ 27.413808] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.418269] sock_sendmsg+0xca/0x110 [ 27.421950] ___sys_sendmsg+0x75b/0x8a0 [ 27.425891] ? copy_msghdr_from_user+0x590/0x590 [ 27.430609] ? lock_downgrade+0x980/0x980 [ 27.434729] ? __fget_light+0x29d/0x390 [ 27.438666] ? fget_raw+0x20/0x20 [ 27.442085] ? __handle_mm_fault+0x3dd0/0x3dd0 [ 27.446629] ? vmacache_find+0x5f/0x280 [ 27.450571] ? up_read+0x1a/0x40 [ 27.453901] ? __do_page_fault+0x3d6/0xc90 [ 27.458100] ? __local_bh_enable_ip+0x121/0x230 [ 27.462734] ? __fdget+0x18/0x20 [ 27.466066] __sys_sendmsg+0xe5/0x210 [ 27.469829] ? __sys_sendmsg+0xe5/0x210 [ 27.473779] ? SyS_shutdown+0x290/0x290 [ 27.477730] ? __do_page_fault+0xc90/0xc90 [ 27.481940] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.486920] SyS_sendmsg+0x2d/0x50 [ 27.490423] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 27.495139] RIP: 0033:0x43fe49 [ 27.498292] RSP: 002b:00007fffcc08e338 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 27.505961] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe49 [ 27.513194] RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000003 [ 27.520432] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 27.527664] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004017b0 [ 27.534895] R13: 0000000000401840 R14: 0000000000000000 R15: 0000000000000000 [ 27.542135] Code: f2 f2 f2 c7 40 14 00 f2 f2 f2 c7 40 18 f2 f2 f2 f2 c7 40 1c 00 f2 f2 f2 c7 40 20 f3 f3 f3 f3 e8 23 2f db ff 4c 89 f8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 41 04 00 00 4d 8d b5 00 ff ff ff 48 ba 00 [ 27.561431] RIP: page_mapping+0xa4/0x530 RSP: ffff8801c53ff320 [ 27.567531] ---[ end trace 35a580a687e33561 ]--- [ 27.572297] Kernel panic - not syncing: Fatal exception [ 27.577673] Dumping ftrace buffer: [ 27.581177] (ftrace buffer empty) [ 27.584855] Kernel Offset: disabled [ 27.588445] Rebooting in 86400 seconds..