bisecting fixing commit since 5bdd9ad875b6edf213f54ec3986ed9e8640c5cf9
building syzkaller on 13427bd9a952fddd2f59aaca90a76fe209f6c9c9
testing commit 5bdd9ad875b6edf213f54ec3986ed9e8640c5cf9 with gcc (GCC) 8.1.0
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: crashed: WARNING: locking bug in selinux_netlbl_socket_connect
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing current HEAD 59c36bc8d377c8764eb617a92211e0fc2f1318da
testing commit 59c36bc8d377c8764eb617a92211e0fc2f1318da with gcc (GCC) 8.1.0
run #0: crashed: WARNING: locking bug in do_ipv6_setsockopt
run #1: crashed: WARNING: locking bug in selinux_netlbl_socket_connect
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 33m3.296549879s (build: 11m0.402869176s, test: 20m31.740148742s)
the crash still happens on HEAD
crash: WARNING: locking bug in selinux_netlbl_socket_connect
WARNING: CPU: 1 PID: 31160 at kernel/locking/lockdep.c:773 look_up_lock_class kernel/locking/lockdep.c:772 [inline]
WARNING: CPU: 1 PID: 31160 at kernel/locking/lockdep.c:773 register_lock_class+0x296/0x22d0 kernel/locking/lockdep.c:1117
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 31160 Comm: syz-executor.5 Not tainted 5.3.0-rc5+ #1
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+0x113/0x167 lib/dump_stack.c:113
 panic+0x223/0x4dc kernel/panic.c:219
 __warn.cold.10+0x1b/0x37 kernel/panic.c:576
 report_bug+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:look_up_lock_class kernel/locking/lockdep.c:772 [inline]
RIP: 0010:register_lock_class+0x296/0x22d0 kernel/locking/lockdep.c:1117
Code: e0 87 08 74 27 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 0f 85 be 16 00 00 49 81 3c 24 60 06 33 89 74 02 <0f> 0b 45 85 c0 0f 84 67 03 00 00 41 83 e1 01 0f 85 5d 03 00 00 41
RSP: 0018:ffff8880917679e0 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffffffff89a5f000 RCX: 1ffff110122ecf46
RDX: 1ffff1101113310c RSI: 1ffffffff13b2830 RDI: ffff888088998878
RBP: ffff888091767ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88808ee4e040 R12: ffff888088998860
R13: 0000000000000003 R14: 0000000000000000 R15: ffffffff87ad0be0
 __lock_acquire+0xff/0x4b70 kernel/locking/lockdep.c:3762
 lock_acquire+0x194/0x410 kernel/locking/lockdep.c:4412
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:343 [inline]
 lock_sock_nested+0x3a/0x100 net/core/sock.c:2926
 lock_sock include/net/sock.h:1522 [inline]
 selinux_netlbl_socket_connect+0x16/0xa0 security/selinux/netlabel.c:607
 selinux_socket_connect+0x4a/0x60 security/selinux/hooks.c:4745
 security_socket_connect+0x4a/0x90 security/security.c:1958
 __sys_connect+0x163/0x2d0 net/socket.c:1824
 __do_sys_connect net/socket.c:1839 [inline]
 __se_sys_connect net/socket.c:1836 [inline]
 __x64_sys_connect+0x6e/0xb0 net/socket.c:1836
 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459279
Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007eff976dec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279
RDX: 000000000000001c RSI: 0000000020000000 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007eff976df6d4
R13: 00000000004bf74d R14: 00000000004d0c18 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..