bisecting fixing commit since 59250f8a7f3a60a2661b84cbafc1e0eb5d05ec9b building syzkaller on 8bcc32a67bc7180173447e1a78c03dae096b4231 testing commit 59250f8a7f3a60a2661b84cbafc1e0eb5d05ec9b compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: c5e44d9d7c55f3eef1a3b64a8a64f25551b73ae705c52675d9e946c3f0d1638d all runs: crashed: WARNING: bad unlock balance in rxrpc_do_sendmsg testing current HEAD 42226c989789d8da4af1de0c31070c96726d990c testing commit 42226c989789d8da4af1de0c31070c96726d990c compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 41a458c8b30164a72a04a3fb41a5da8eea30fe7c6ece7a05c395f70ddafc08c9 all runs: crashed: WARNING: bad unlock balance in rxrpc_do_sendmsg revisions tested: 2, total time: 18m49.61903221s (build: 12m3.576298543s, test: 6m19.77243295s) the crash still happens on HEAD commit msg: Linux 5.18-rc7 crash: WARNING: bad unlock balance in rxrpc_do_sendmsg ===================================== WARNING: bad unlock balance detected! 5.18.0-rc7-syzkaller #0 Not tainted ------------------------------------- syz-executor.0/4070 is trying to release lock (&call->user_mutex) at: [] rxrpc_do_sendmsg+0x847/0x1110 net/rxrpc/sendmsg.c:748 but there are no more locks to release! other info that might help us debug this: no locks held by syz-executor.0/4070. stack backtrace: CPU: 0 PID: 4070 Comm: syz-executor.0 Not tainted 5.18.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 print_unlock_imbalance_bug include/trace/events/lock.h:58 [inline] __lock_release kernel/locking/lockdep.c:5308 [inline] lock_release.cold+0x49/0x4e kernel/locking/lockdep.c:5661 __mutex_unlock_slowpath+0x99/0x5e0 kernel/locking/mutex.c:893 rxrpc_do_sendmsg+0x847/0x1110 net/rxrpc/sendmsg.c:748 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 ____sys_sendmsg+0x5b9/0x7a0 net/socket.c:2413 ___sys_sendmsg+0xd3/0x150 net/socket.c:2467 __sys_sendmsg+0xb2/0x140 net/socket.c:2496 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: 0033:0x7fe9870890e9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe988229168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fe98719bf60 RCX: 00007fe9870890e9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007fe9870e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd588e778f R14: 00007fe988229300 R15: 0000000000022000