bisecting fixing commit since 438645193e59e91761ccb3fa55f6ce70b615ff93 building syzkaller on e4f103c49590d5ff0c7e416ade15a99f54029f8d testing commit 438645193e59e91761ccb3fa55f6ce70b615ff93 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: d3f8e459841cf263f6495015f446c3dd48486d9ce500d8a2ffc4503824c06311 all runs: crashed: WARNING: bad unlock balance in rxrpc_do_sendmsg testing current HEAD 14702b3b2438e2f2d07ae93b5d695c166e5c83d1 testing commit 14702b3b2438e2f2d07ae93b5d695c166e5c83d1 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 94bcfdf102a1824e93a8db24749b768dc9ce50553ec81b2465ddbebed6adc886 all runs: crashed: WARNING: bad unlock balance in rxrpc_do_sendmsg revisions tested: 2, total time: 19m4.3028381s (build: 12m22.959799576s, test: 6m6.629858479s) the crash still happens on HEAD commit msg: Merge tag 'soc-fixes-5.17-4' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc crash: WARNING: bad unlock balance in rxrpc_do_sendmsg ===================================== WARNING: bad unlock balance detected! 5.17.0-rc8-syzkaller #0 Not tainted ------------------------------------- syz-executor271/4058 is trying to release lock (&call->user_mutex) at: [] rxrpc_do_sendmsg+0x859/0x1110 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-executor271/4058. stack backtrace: CPU: 1 PID: 4058 Comm: syz-executor271 Not tainted 5.17.0-rc8-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:5306 [inline] lock_release.cold+0x49/0x4e kernel/locking/lockdep.c:5659 __mutex_unlock_slowpath+0x99/0x5e0 kernel/locking/mutex.c:893 rxrpc_do_sendmsg+0x859/0x1110 net/rxrpc/sendmsg.c:748 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 ____sys_sendmsg+0x5bf/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: 0033:0x7fc7b3cbbde9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc7b3c6e318 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fc7b3d443e8 RCX: 00007fc7b3cbbde9 RDX: 000