On Thu, Nov 28, 2024 at 05:12:23PM +0800, 江世昊 wrote: > Hi developers: > > We may found a bug in smc module which can lead to deadlock recently. > > HEAD commit: 819837584309 6.12.0-rc5 > git tree: upstream > kernel config: https://drive.google.com/file/d/1-9pltE-1CMgGgNFu9o5l0BlCHk3Rnzb_/view?usp=sharing > console output: https://drive.google.com/file/d/1uH0RDdftVIq_Boa6YWowLj3WujqVBuL7/view?usp=sharing > syz repro: https://drive.google.com/file/d/1WUjiYSMebSZ7fR0uxrGx-kDLrf1v_Nra/view?usp=sharing > C reproducer: https://drive.google.com/file/d/1_lB5_uacVnfDNE8VpuiY-NxEtDdzJ0Z8/view?usp=sharing > > Environment: > Ubuntu 22.04 on Linux 5.15 > QEMU emulator version 6.2.0 > qemu-system-x86_64 \ > -m 2G \ > -smp 2 \ > -kernel /home/wd/bzImage \ > -append "console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0" \ > -drive file=/home/wd/bullseye.img,format=raw \ > -net user,host=10.0.2.10,hostfwd=tcp:127.0.0.1:10021-:22 \ > -net nic,model=e1000 \ > -enable-kvm \ > -nographic \ > -pidfile vm.pid \ > 2>&1 | tee vm.log > > If you fix this issue, please add the following tag to the commit: > Reported-by: Shihao Jiang<sh.jiang@xxxxxxxxxx> > > ====================================================== > WARNING: possible circular locking dependency detected > 6.12.0-rc5 #1 Tainted: G W > ------------------------------------------------------ > syz-executor351/9413 is trying to acquire lock: > ffff88804bd68aa8 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_switch_to_fallback+0x2d/0xa00 net/smc/af_smc.c:902 > > but task is already holding lock: > ffff88804bd68258 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1611 [inline] > ffff88804bd68258 (sk_lock-AF_INET6){+.+.}-{0:0}, at: smc_setsockopt+0x323/0xc10 net/smc/af_smc.c:3077 > > which lock already depends on the new lock. Please submit a fix for this issue as you have a test-case for it. It's just a "normal" lockdep warning, not a "security" issue. thanks, greg k-h
