bisecting fixing commit since 625acffd7ae2c52898d249e6c5c39f348db0d8df building syzkaller on 9d2ab5dfe7727dfea4b9b279f4edf731acb386ef testing commit 625acffd7ae2c52898d249e6c5c39f348db0d8df compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: bca0a25d695a04303c22e16c45609273b4648804058f11d80b30ff866bc4fe95 run #0: crashed: WARNING: locking bug in do_ipv6_setsockopt run #1: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #2: crashed: WARNING: locking bug in do_ipv6_setsockopt run #3: crashed: WARNING: locking bug in do_ipv6_setsockopt run #4: crashed: WARNING: locking bug in do_ipv6_setsockopt run #5: crashed: WARNING: locking bug in do_ipv6_setsockopt run #6: crashed: WARNING: locking bug in do_ipv6_setsockopt run #7: crashed: KASAN: use-after-free Write in l2tp_tunnel_del_work run #8: crashed: WARNING: locking bug in do_ipv6_setsockopt run #9: crashed: WARNING: locking bug in do_ipv6_setsockopt run #10: crashed: WARNING: locking bug in do_ipv6_setsockopt run #11: crashed: WARNING: locking bug in do_ipv6_setsockopt run #12: crashed: WARNING: locking bug in do_ipv6_setsockopt run #13: crashed: WARNING: locking bug in do_ipv6_setsockopt run #14: crashed: WARNING: locking bug in do_ipv6_setsockopt run #15: OK run #16: OK run #17: crashed: WARNING: locking bug in do_ipv6_setsockopt run #18: OK run #19: crashed: WARNING: locking bug in do_ipv6_setsockopt testing current HEAD 23d04328444a8fa0ca060c5e532220dac8e8bc26 testing commit 23d04328444a8fa0ca060c5e532220dac8e8bc26 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 369f58b739f3da2fa4824dcb844c0ce00e1be08a3d7c9fa2c949695eea4df404 run #0: crashed: WARNING: locking bug in do_ipv6_setsockopt run #1: crashed: WARNING: locking bug in do_ipv6_setsockopt run #2: crashed: WARNING: locking bug in do_ipv6_setsockopt run #3: crashed: WARNING: locking bug in do_ipv6_setsockopt run #4: crashed: WARNING: locking bug in do_ipv6_setsockopt run #5: crashed: WARNING: locking bug in do_ipv6_setsockopt run #6: crashed: WARNING: locking bug in do_ipv6_setsockopt run #7: crashed: WARNING: locking bug in do_ipv6_setsockopt run #8: OK run #9: OK revisions tested: 2, total time: 30m27.956228183s (build: 12m26.962891508s, test: 17m9.372186021s) the crash still happens on HEAD commit msg: Merge tag 'for-5.17/parisc-4' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux crash: WARNING: locking bug in do_ipv6_setsockopt ------------[ cut here ]------------ WARNING: CPU: 0 PID: 11055 at kernel/locking/lockdep.c:909 look_up_lock_class+0x6a/0xd0 kernel/locking/lockdep.c:909 Modules linked in: CPU: 0 PID: 11055 Comm: syz-executor.4 Not tainted 5.17.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:look_up_lock_class+0x6a/0xd0 kernel/locking/lockdep.c:909 Code: 85 c0 75 0a eb 57 48 8b 00 48 85 c0 74 4f 48 39 70 40 75 f2 48 8b 4f 18 48 39 88 b0 00 00 00 74 0b 48 81 3f a0 13 2b 8e 74 02 <0f> 0b 5d c3 9c 5a 80 e6 02 74 c2 e8 06 e9 06 fb 85 c0 74 1f 8b 05 RSP: 0018:ffffc90002a0f7b0 EFLAGS: 00010006 RAX: ffffffff8f0f43e0 RBX: ffffffff8f5fb840 RCX: ffffffff89f8ef60 RDX: 0000000000000046 RSI: ffffffff8f974c20 RDI: ffff888075e8e8b0 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888075e8e8b0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fdd2d115700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdd2d115718 CR3: 000000005d587000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: register_lock_class+0xbe/0x11a0 kernel/locking/lockdep.c:1258 __lock_acquire+0x10b/0x5630 kernel/locking/lockdep.c:4906 lock_acquire kernel/locking/lockdep.c:5639 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5604 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:354 [inline] lock_sock_nested+0x50/0xd0 net/core/sock.c:3299 lock_sock include/net/sock.h:1668 [inline] do_ipv6_setsockopt.constprop.0+0x24a/0x3870 net/ipv6/ipv6_sockglue.c:420 ipv6_setsockopt+0xbb/0x120 net/ipv6/ipv6_sockglue.c:1019 __sys_setsockopt+0x1fd/0x4e0 net/socket.c:2180 __do_sys_setsockopt net/socket.c:2191 [inline] __se_sys_setsockopt net/socket.c:2188 [inline] __x64_sys_setsockopt+0xb5/0x150 net/socket.c:2188 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdd2d115188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9 RDX: 000000000000003b RSI: 0000000000000029 RDI: 0000000000000004 RBP: 00000000004bfcb9 R08: 0000000000000008 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffd16f9e43f R14: 00007fdd2d115300 R15: 0000000000022000