bisecting fixing commit since fa5941f45d7ed070118b7c209b7f2c3a034293bd
building syzkaller on 618456b4f4f74528ac6b9d709b1870d0e1d70eb2
testing commit fa5941f45d7ed070118b7c209b7f2c3a034293bd with gcc (GCC) 8.1.0
kernel signature: 4b3df55209a2d2409b35440878c77af14f1b5c509ab70f7c079ce9c87fcd1f1d
all runs: crashed: WARNING: locking bug in inet_autobind
testing current HEAD e0f8b8a65a473a8baa439cf865a694bbeb83fe90
testing commit e0f8b8a65a473a8baa439cf865a694bbeb83fe90 with gcc (GCC) 8.1.0
kernel signature: d666d16abec56752774cea1903c148b46c7f5d34274a4a6b5502f41f98411aa4
run #0: OK
run #1: crashed: WARNING: locking bug in inet_autobind
run #2: crashed: WARNING: locking bug in inet_autobind
run #3: crashed: WARNING: locking bug in inet_autobind
run #4: crashed: WARNING: locking bug in inet_autobind
run #5: crashed: WARNING: locking bug in inet_autobind
run #6: OK
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 32m50.431162717s (build: 16m18.919273322s, test: 15m39.634107865s)
the crash still happens on HEAD
commit msg: Linux 4.14.170
crash: WARNING: locking bug in inet_autobind
------------[ cut here ]------------
WARNING: CPU: 1 PID: 17098 at kernel/locking/lockdep.c:722 arch_local_save_flags arch/x86/include/asm/paravirt.h:774 [inline]
WARNING: CPU: 1 PID: 17098 at kernel/locking/lockdep.c:722 look_up_lock_class kernel/locking/lockdep.c:713 [inline]
WARNING: CPU: 1 PID: 17098 at kernel/locking/lockdep.c:722 register_lock_class+0xfb6/0x1cd0 kernel/locking/lockdep.c:756
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 17098 Comm: syz-executor.0 Not tainted 4.14.170-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xf7/0x13b lib/dump_stack.c:58
 panic+0x1b0/0x36a kernel/panic.c:183
 __warn.cold.8+0x25/0x2a kernel/panic.c:547
 report_bug+0x1a4/0x1f3 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:look_up_lock_class kernel/locking/lockdep.c:722 [inline]
RIP: 0010:register_lock_class+0xfb6/0x1cd0 kernel/locking/lockdep.c:756
RSP: 0018:ffff88809805f970 EFLAGS: 00010087
RAX: dffffc0000000000 RBX: ffffffff88f020b0 RCX: 1ffff1101300bf39
RDX: 1ffff11011d26717 RSI: 0000000000000000 RDI: ffff88808e9338b8
RBP: ffff88809805fa50 R08: ffff88808e9338a0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89381880
R13: 1ffff1101300bf39 R14: ffffffff870b1e80 R15: ffffffff88f020b0
 __lock_acquire+0x14f/0x4500 kernel/locking/lockdep.c:3374
 lock_acquire+0x173/0x400 kernel/locking/lockdep.c:3994
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:176
 spin_lock_bh include/linux/spinlock.h:322 [inline]
 lock_sock_nested+0x3a/0x100 net/core/sock.c:2762
 lock_sock include/net/sock.h:1467 [inline]
 inet_autobind+0x13/0x160 net/ipv4/af_inet.c:178
 inet_dgram_connect+0x10e/0x230 net/ipv4/af_inet.c:538
 SYSC_connect+0x1e5/0x2a0 net/socket.c:1655
 SyS_connect+0x9/0x10 net/socket.c:1636
 do_syscall_64+0x1c9/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458da9
RSP: 002b:00007ff89a899c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458da9
RDX: 000000000000001c RSI: 0000000020000080 RDI: 0000000000000008
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff89a89a6d4
R13: 00000000004bf1f1 R14: 00000000004d02c0 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..