bisecting fixing commit since 6fbc7275c7a9ba97877050335f290341a1fd8dbf
building syzkaller on cccc4302d7da39e2fc41f9275442c267935632b7
testing commit 6fbc7275c7a9ba97877050335f290341a1fd8dbf with gcc (GCC) 8.1.0
run #0: crashed: WARNING: locking bug in do_ipv6_getsockopt
run #1: crashed: WARNING: locking bug in do_ipv6_getsockopt
run #2: crashed: WARNING: locking bug in do_ipv6_getsockopt
run #3: crashed: WARNING: locking bug in do_ipv6_getsockopt
run #4: crashed: WARNING: locking bug in do_ipv6_getsockopt
run #5: crashed: WARNING: locking bug in do_ipv6_getsockopt
run #6: crashed: WARNING: locking bug in do_ipv6_getsockopt
run #7: crashed: WARNING: locking bug in do_ipv6_getsockopt
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_getsockopt
run #1: crashed: WARNING: locking bug in do_ipv6_getsockopt
run #2: crashed: WARNING: locking bug in do_ipv6_getsockopt
run #3: crashed: WARNING: locking bug in do_ipv6_getsockopt
run #4: crashed: WARNING: locking bug in do_ipv6_getsockopt
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 32m51.066042378s (build: 11m20.20515452s, test: 20m10.739207196s)
the crash still happens on HEAD
crash: WARNING: locking bug in do_ipv6_getsockopt
WARNING: CPU: 1 PID: 20698 at kernel/locking/lockdep.c:773 look_up_lock_class kernel/locking/lockdep.c:772 [inline]
WARNING: CPU: 1 PID: 20698 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: 20698 Comm: syz-executor.1 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:ffff8880921b7718 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffffffff89a5d740 RCX: 1ffff11012436eed
RDX: 1ffff11012bffa34 RSI: 1ffffffff13b2830 RDI: ffff888095ffd1b8
RBP: ffff8880921b77f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8880a0f96480 R12: ffff888095ffd1a0
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]
 do_ipv6_getsockopt.isra.5+0xd06/0x2400 net/ipv6/ipv6_sockglue.c:1167
 ipv6_getsockopt+0xec/0x1c0 net/ipv6/ipv6_sockglue.c:1391
 udpv6_getsockopt+0x16/0x20 net/ipv6/udp.c:1577
 sock_common_getsockopt+0x73/0xf0 net/core/sock.c:3098
 __sys_getsockopt+0x13c/0x2e0 net/socket.c:2129
 __do_sys_getsockopt net/socket.c:2144 [inline]
 __se_sys_getsockopt net/socket.c:2141 [inline]
 __x64_sys_getsockopt+0xb9/0x150 net/socket.c:2141
 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4597c9
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:00007fd25d740c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004597c9
RDX: 0000000000000036 RSI: 0000000000000029 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000020000080 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd25d7416d4
R13: 00000000004c0803 R14: 00000000004d2b88 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..