------------[ cut here ]------------ AppArmor WARN cred_label: ((!blob)): WARNING: CPU: 0 PID: 19015 at security/apparmor/include/cred.h:30 cred_label security/apparmor/include/cred.h:30 [inline] WARNING: CPU: 0 PID: 19015 at security/apparmor/include/cred.h:30 apparmor_cred_free+0x12f/0x1a0 security/apparmor/lsm.c:62 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 19015 Comm: syz-executor4 Not tainted 5.0.0-rc2-next-20190117 #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 panic+0x2cb/0x65c kernel/panic.c:214 __warn.cold+0x20/0x48 kernel/panic.c:571 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:cred_label security/apparmor/include/cred.h:30 [inline] RIP: 0010:apparmor_cred_free+0x12f/0x1a0 security/apparmor/lsm.c:62 Code: 7c 88 48 c7 c7 80 d2 7c 88 e8 9d 69 f2 fd 0f 0b eb a9 e8 a4 40 29 fe 48 c7 c6 40 e2 7c 88 48 c7 c7 80 d2 7c 88 e8 81 69 f2 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 80 38 00 75 4a 4c 8b 2c 25 00 RSP: 0018:ffff8880ae6079f8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000100 RSI: ffffffff81688726 RDI: 0000000000000006 RBP: ffff8880ae607a18 R08: ffff88809934a4c0 R09: ffff88809934ad60 R10: ffff88809934a4c0 R11: 0000000000000000 R12: ffff88808dd78900 R13: ffff88808dd78900 R14: ffff88808dd78988 R15: dffffc0000000000 security_cred_free+0x4b/0xf0 security/security.c:1490 put_cred_rcu+0x21f/0x6e0 kernel/cred.c:118 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2486 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2799 [inline] rcu_core+0xc4a/0x1680 kernel/rcu/tree.c:2780 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:__sanitizer_cov_trace_pc+0x3b/0x50 kernel/kcov.c:106 Code: 65 8b 15 68 b8 7f 7e 81 e2 00 01 1f 00 75 2b 8b 90 e0 12 00 00 83 fa 02 75 20 48 8b 88 e8 12 00 00 8b 80 e4 12 00 00 48 8b 11 <48> 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 RSP: 0018:ffff8880853d7580 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 0000000000000003 RCX: ffffc90009e33000 RDX: 000000000003ffff RSI: ffffffff861ce7b8 RDI: ffff88803381e559 RBP: ffff8880853d7580 R08: ffff88809934a4c0 R09: 0000000000000004 R10: ffffed1006703cab R11: ffff88803381e558 R12: ffff88803381e559 R13: 0000000000001aa7 R14: ffff8880853d7d80 R15: ffff8880995234c0 check_object_size include/linux/thread_info.h:119 [inline] check_copy_size include/linux/thread_info.h:150 [inline] copy_to_iter include/linux/uio.h:141 [inline] simple_copy_to_iter+0x18/0x40 net/core/datagram.c:516 __skb_datagram_iter+0x480/0x750 net/core/datagram.c:446 skb_copy_datagram_iter+0x10d/0x490 net/core/datagram.c:530 skb_copy_datagram_msg include/linux/skbuff.h:3338 [inline] tcp_recvmsg+0x11cb/0x3270 net/ipv4/tcp.c:2116 inet_recvmsg+0x17b/0x6d0 net/ipv4/af_inet.c:830 sock_recvmsg_nosec net/socket.c:794 [inline] sock_recvmsg net/socket.c:801 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:797 ___sys_recvmsg+0x2a8/0x680 net/socket.c:2278 __sys_recvmsg+0x10f/0x270 net/socket.c:2327 __do_sys_recvmsg net/socket.c:2337 [inline] __se_sys_recvmsg net/socket.c:2334 [inline] __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2334 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458099 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007efc1e9bbc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099 RDX: 0000000000000100 RSI: 0000000020000240 RDI: 0000000000000003 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007efc1e9bc6d4 R13: 00000000004c4cf7 R14: 00000000004d85a8 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..