bisecting fixing commit since 672481c2deffb371d8a7dfdc009e44c09864a869
building syzkaller on af6b8ef8f18c45343685f0ee7af9dd3a4b2b5d95
testing commit 672481c2deffb371d8a7dfdc009e44c09864a869 with gcc (GCC) 8.1.0
kernel signature: 010dfdba241bd5f8ed4e22cd370e64f783977ac9bcc4b7396f8322c1784bbdd4
run #0: crashed: WARNING: locking bug in __inet6_bind
run #1: crashed: WARNING: locking bug in __inet6_bind
run #2: crashed: WARNING: locking bug in __inet6_bind
run #3: crashed: WARNING: locking bug in __inet6_bind
run #4: crashed: WARNING: locking bug in __inet6_bind
run #5: crashed: WARNING: locking bug in __inet6_bind
run #6: crashed: WARNING: locking bug in __inet6_bind
run #7: OK
run #8: OK
run #9: OK
testing current HEAD 76bda503e6406539b1ad5adefe69d3df439ee97f
testing commit 76bda503e6406539b1ad5adefe69d3df439ee97f with gcc (GCC) 8.1.0
kernel signature: aff9622afb06093859e36b9de5563fcfe5a99109d599b38eac6da9a3cc7c4350
all runs: crashed: WARNING: locking bug in __inet6_bind
revisions tested: 2, total time: 35m12.160032942s (build: 17m32.414588174s, test: 16m30.693654729s)
the crash still happens on HEAD
commit msg: Linux 4.19.159
crash: WARNING: locking bug in __inet6_bind
WARNING: CPU: 0 PID: 14819 at kernel/locking/lockdep.c:698 arch_local_save_flags arch/x86/include/asm/paravirt.h:784 [inline]
WARNING: CPU: 0 PID: 14819 at kernel/locking/lockdep.c:698 look_up_lock_class kernel/locking/lockdep.c:689 [inline]
WARNING: CPU: 0 PID: 14819 at kernel/locking/lockdep.c:698 register_lock_class+0xb95/0x2350 kernel/locking/lockdep.c:748
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 14819 Comm: syz-executor.0 Not tainted 4.19.159-syzkaller #0
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+0x123/0x177 lib/dump_stack.c:118
 panic+0x1cd/0x375 kernel/panic.c:186
 __warn.cold.8+0x1b/0x3e kernel/panic.c:541
 report_bug+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:look_up_lock_class kernel/locking/lockdep.c:698 [inline]
RIP: 0010:register_lock_class+0xb95/0x2350 kernel/locking/lockdep.c:748
Code: 00 48 89 ca 4d 8b 7e c0 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 53 0f 00 00 4c 89 39 e9 f8 f7 ff ff 0f 0b <0f> 0b e9 da f6 ff ff 49 8d 46 01 4d 69 f6 50 01 00 00 48 89 05 f2
RSP: 0018:ffff88809892f8d0 EFLAGS: 00010083
RAX: 0000000000000004 RBX: ffffffff89d1ae50 RCX: ffff88809fa751a0
RDX: 1ffffffff1431f64 RSI: 0000000000000000 RDI: ffff88809fa751b8
RBP: ffff88809892f9b0 R08: 1ffff11013125f25 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000003
R13: 0000000000000000 R14: ffffffff87d0f440 R15: ffffffff87bfa280
 __lock_acquire+0x160/0x4980 kernel/locking/lockdep.c:3303
 lock_acquire+0x173/0x3d0 kernel/locking/lockdep.c:3907
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168
 spin_lock_bh include/linux/spinlock.h:334 [inline]
 lock_sock_nested+0x3a/0x100 net/core/sock.c:2864
 lock_sock include/net/sock.h:1510 [inline]
 __inet6_bind+0x562/0x1760 net/ipv6/af_inet6.c:302
 inet6_bind+0xbb/0xfe net/ipv6/af_inet6.c:455
 __sys_bind+0x1e1/0x230 net/socket.c:1482
 __do_sys_bind net/socket.c:1493 [inline]
 __se_sys_bind net/socket.c:1491 [inline]
 __x64_sys_bind+0x6e/0xb0 net/socket.c:1491
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a999
Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fdd5deddc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a999
RDX: 000000000000001c RSI: 0000000020000000 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdd5dede6d4
R13: 00000000004c0d25 R14: 00000000004d4858 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..