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Thu, 17 Aug 2023 02:25:46 -0700 (PDT) Date: Thu, 17 Aug 2023 02:25:46 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000438c4a06031aff8b@google.com> Subject: [syzbot] [kernel?] INFO: rcu detected stall in schedule (6) From: syzbot To: linux-kernel@vger.kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: a785fd28d31f Merge tag 'for-6.5-rc5-tag' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=167d8e17a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=3e670757e16affb dashboard link: https://syzkaller.appspot.com/bug?extid=77195ae75047f1438785 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15ec36ada80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f025e375131a/disk-a785fd28.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d38bc269b3fb/vmlinux-a785fd28.xz kernel image: https://storage.googleapis.com/syzbot-assets/5eb32eee65b8/bzImage-a785fd28.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+77195ae75047f1438785@syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=816c/1/0x4000000000000000 softirq=8838/8840 fqs=5242 rcu: hardirqs softirqs csw/system rcu: number: 0 0 0 rcu: cputime: 29521 22957 0 ==> 52480(ms) rcu: (t=10500 jiffies g=5877 q=1892 ncpus=2) CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.5.0-rc5-syzkaller-00362-ga785fd28d31f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:write_comp_data+0x7/0x90 kernel/kcov.c:230 Code: 81 e2 00 01 ff 00 75 10 65 48 8b 04 25 80 b9 03 00 48 8b 80 f8 15 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 65 8b 05 c1 b6 7d 7e <49> 89 f1 89 c6 49 89 d2 81 e6 00 01 00 00 49 89 f8 65 48 8b 14 25 RSP: 0018:ffffc90000007d58 EFLAGS: 00000293 RAX: 0000000000000102 RBX: ffff8880638b6394 RCX: ffffffff88595887 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000004 RBP: 0000000000000008 R08: 0000000000000004 R09: 0000000000000008 R10: 0000000000000010 R11: 0000000000000000 R12: 0000000000000010 R13: ffff88807ce5ab60 R14: 0000000000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000600 CR3: 000000000c776000 CR4: 0000000000350ef0 Call Trace: taprio_dequeue_tc_priority+0x247/0x4b0 net/sched/sch_taprio.c:808 taprio_dequeue+0x12e/0x5f0 net/sched/sch_taprio.c:868 dequeue_skb net/sched/sch_generic.c:292 [inline] qdisc_restart net/sched/sch_generic.c:397 [inline] __qdisc_run+0x1c4/0x19d0 net/sched/sch_generic.c:415 qdisc_run include/net/pkt_sched.h:125 [inline] qdisc_run include/net/pkt_sched.h:122 [inline] net_tx_action+0x71e/0xc80 net/core/dev.c:5049 __do_softirq+0x218/0x965 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1109 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:finish_task_switch.isra.0+0x220/0xc90 kernel/sched/core.c:5253 Code: 0a 00 00 44 8b 0d c0 01 52 0d 45 85 c9 0f 85 c0 01 00 00 48 89 df e8 ff f8 ff ff e8 9a dd 32 00 fb 65 48 8b 1c 25 80 b9 03 00 <48> 8d bb e0 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc90000147c88 EFLAGS: 00000202 RAX: 000000000006247f RBX: ffff888015e5bb80 RCX: 1ffffffff1d56e19 RDX: 0000000000000000 RSI: ffffffff8a6c80a0 RDI: ffffffff8ac811c0 RBP: ffffc90000147cd0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8eaba257 R11: 0000000000000000 R12: ffff8880b983d118 R13: ffff88802bd49dc0 R14: 0000000000000000 R15: ffff8880b983c3c0 context_switch kernel/sched/core.c:5384 [inline] __schedule+0xee9/0x59f0 kernel/sched/core.c:6710 schedule+0xe7/0x1b0 kernel/sched/core.c:6786 smpboot_thread_fn+0x2ee/0xa00 kernel/smpboot.c:160 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup