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Message-ID: <ZdVgLbuAYGKoDzpS@xpf.sh.intel.com> Date: Wed, 21 Feb 2024 10:30:05 +0800 From: Pengfei Xu <pengfei.xu@...el.com> To: <kuniyu@...zon.com> CC: <davem@...emloft.net>, <dumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>, <kuni1840@...il.com>, <netdev@...r.kernel.org>, <pengfei.xu@...el.com>, <linux-kernel@...r.kernel.org>, <lkp@...el.com> Subject: [Syzkaller & bisect] There is BUG: soft lockup after sendmsg syscall in v6.8-rc4 Hi Kuniyuki Iwashima and kernel experts, Greeting! There is BUG: soft lockup after sendmsg syscall in v6.8-rc4 in guest. All detailed info: https://github.com/xupengfe/syzkaller_logs/tree/main/240220_161242_softlockup Syzkaller reproduced code: https://github.com/xupengfe/syzkaller_logs/blob/main/240220_161242_softlockup/repro.c Syzkaller syscall reproduced steps: https://github.com/xupengfe/syzkaller_logs/blob/main/240220_161242_softlockup/repro.prog Kconfig(need make olddefconfig): https://github.com/xupengfe/syzkaller_logs/blob/main/240220_161242_softlockup/kconfig_origin Bisect info: https://github.com/xupengfe/syzkaller_logs/blob/main/240220_161242_softlockup/bisect_info.log v6.8-rc4 issue dmesg: https://github.com/xupengfe/syzkaller_logs/blob/main/240220_161242_softlockup/841c35169323cd833294798e58b9bf63fa4fa1de_dmesg.log bzImage_v6.8-rc4: https://github.com/xupengfe/syzkaller_logs/raw/main/240220_161242_softlockup/bzImage_v6.8-rc4.tar.gz Bisected and found first bad commit: " 1279f9d9dec2 af_unix: Call kfree_skb() for dead unix_(sk)->oob_skb in GC. " After reverted above commit on top of v6.8-rc4 kernel, this issue was gone. Syzkaller repro.report: https://github.com/xupengfe/syzkaller_logs/blob/main/240220_161242_softlockup/repro.report " watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [gdbus:349] Modules linked in: irq event stamp: 25162 hardirqs last enabled at (25161): [<ffffffff855dff2e>] irqentry_exit+0x3e/0xa0 kernel/entry/common.c:351 hardirqs last disabled at (25162): [<ffffffff855dded4>] sysvec_apic_timer_interrupt+0x14/0xc0 arch/x86/kernel/apic/apic.c:1076 softirqs last enabled at (25140): [<ffffffff8127fcc8>] invoke_softirq kernel/softirq.c:427 [inline] softirqs last enabled at (25140): [<ffffffff8127fcc8>] __irq_exit_rcu+0xa8/0x110 kernel/softirq.c:632 softirqs last disabled at (25135): [<ffffffff8127fcc8>] invoke_softirq kernel/softirq.c:427 [inline] softirqs last disabled at (25135): [<ffffffff8127fcc8>] __irq_exit_rcu+0xa8/0x110 kernel/softirq.c:632 CPU: 0 PID: 349 Comm: gdbus Not tainted 6.8.0-rc4-2024-02-12-intel-next-e92619743fcb+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:__sanitizer_cov_trace_pc+0x38/0x70 kernel/kcov.c:207 Code: 65 8b 05 73 89 a0 7e 48 89 e5 48 8b 75 08 a9 00 01 ff 00 74 0f f6 c4 01 74 35 8b 82 e4 1d 00 00 85 c0 74 2b 8b 82 c0 1d 00 00 <83> f8 02 75 20 48 8b 8a c8 1d 00 00 8b 92 c4 1d 00 00 48 8b 01 48 RSP: 0018:ffff88800b48f7b0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff888013018000 RCX: 1ffffffff12150bb RDX: ffff888011ab8000 RSI: ffffffff8515e235 RDI: ffff888013018770 RBP: ffff88800b48f7b0 R08: 0000000000000001 R09: fffffbfff120f86e R10: ffffffff8907c377 R11: 0000000000000001 R12: ffff888013018000 R13: dffffc0000000000 R14: ffff888013018630 R15: ffff88800b48f840 FS: 0000000000000000(0000) GS:ffff88806ca00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffcc5fd648 CR3: 0000000006c82000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: <IRQ> </IRQ> <TASK> unix_gc+0x465/0xfd0 net/unix/garbage.c:319 unix_release_sock+0xb8c/0xe80 net/unix/af_unix.c:683 unix_release+0x9c/0x100 net/unix/af_unix.c:1064 __sock_release+0xb6/0x280 net/socket.c:659 sock_close+0x27/0x40 net/socket.c:1421 __fput+0x284/0xb70 fs/file_table.c:376 ____fput+0x1f/0x30 fs/file_table.c:404 task_work_run+0x19d/0x2b0 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xb51/0x28c0 kernel/exit.c:871 do_group_exit+0xe5/0x2c0 kernel/exit.c:1020 get_signal+0x2715/0x27d0 kernel/signal.c:2893 arch_do_signal_or_restart+0x8e/0x7e0 arch/x86/kernel/signal.c:311 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0x129/0x190 kernel/entry/common.c:212 do_syscall_64+0x82/0x150 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6e/0x76 RIP: 0033:0x7fe8f8b4296f Code: Unable to access opcode bytes at 0x7fe8f8b42945. RSP: 002b:00007fe8d7dff9c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000007 RAX: fffffffffffffdfc RBX: 00007fe8f8f73071 RCX: 00007fe8f8b4296f RDX: 00000000ffffffff RSI: 0000000000000002 RDI: 00007fe8a801f3f0 RBP: 00007fe8a801f3f0 R08: 0000000000000000 R09: 00007fe8d7dff850 R10: 00007ffec9196080 R11: 0000000000000293 R12: 0000000000000002 R13: 0000000000000002 R14: 00007fe8d7dffa30 R15: 00007fe8a801c4c0 </TASK> " Thanks! --- If you don't need the following environment to reproduce the problem or if you already have one reproduced environment, please ignore the following information. How to reproduce: git clone https://gitlab.com/xupengfe/repro_vm_env.git cd repro_vm_env tar -xvf repro_vm_env.tar.gz cd repro_vm_env; ./start3.sh // it needs qemu-system-x86_64 and I used v7.1.0 // start3.sh will load bzImage_2241ab53cbb5cdb08a6b2d4688feb13971058f65 v6.2-rc5 kernel // You could change the bzImage_xxx as you want // Maybe you need to remove line "-drive if=pflash,format=raw,readonly=on,file=./OVMF_CODE.fd \" for different qemu version You could use below command to log in, there is no password for root. ssh -p 10023 root@...alhost After login vm(virtual machine) successfully, you could transfer reproduced binary to the vm by below way, and reproduce the problem in vm: gcc -pthread -o repro repro.c scp -P 10023 repro root@...alhost:/root/ Get the bzImage for target kernel: Please use target kconfig and copy it to kernel_src/.config make olddefconfig make -jx bzImage //x should equal or less than cpu num your pc has Fill the bzImage file into above start3.sh to load the target kernel in vm. Tips: If you already have qemu-system-x86_64, please ignore below info. If you want to install qemu v7.1.0 version: git clone https://github.com/qemu/qemu.git cd qemu git checkout -f v7.1.0 mkdir build cd build yum install -y ninja-build.x86_64 yum -y install libslirp-devel.x86_64 ./configure --target-list=x86_64-softmmu --enable-kvm --enable-vnc --enable-gtk --enable-sdl --enable-usb-redir --enable-slirp make make install Best Regards, Thanks!
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