Date: Thu, 01 Jun 2023 14:23:31 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 271764] buf_ring_dequeue_sc not holding strong for arm64 Azure Message-ID: <bug-271764-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D271764 Bug ID: 271764 Summary: buf_ring_dequeue_sc not holding strong for arm64 Azure Product: Base System Version: CURRENT Hardware: arm64 OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: schakrabarti@microsoft.com Hi, In our testing in Azure ARM64, if we are running wget in a infinite while l= oop in a multicore VM, then we are hitting a panic because of incorrect head. Please help on fixing it. To repro: multicore Azure / Hyper-V run in a while loop wget while [ 1 ] do wget https://releases.ubuntu.com/focal/ubuntu-20.04.6-desktop-amd64.iso rm ubuntu* done Then we are seeing this panic: db> bt Tracing pid 0 tid 100090 td 0xffff0000cca37880 db_trace_self() at db_trace_self db_stack_trace() at db_stack_trace+0x11c db_command() at db_command+0x2d8 db_command_loop() at db_command_loop+0x54 db_trap() at db_trap+0xf8 kdb_trap() at kdb_trap+0x20c handle_el1h_sync() at handle_el1h_sync+0x14 --- exception, esr 0xf2000000 kdb_enter() at kdb_enter+0x44 vpanic() at vpanic+0x178 panic() at panic+0x44 hn_txdesc_put() at hn_txdesc_put+0x210 hn_txpkt_done() at hn_txpkt_done+0x2c hn_chan_callback() at hn_chan_callback+0x78 vmbus_chan_task() at vmbus_chan_task+0x28 taskqueue_run_locked() at taskqueue_run_locked+0x17c taskqueue_thread_loop() at taskqueue_thread_loop+0xc8 fork_exit() at fork_exit+0x74 fork_trampoline() at fork_trampoline+0x14 This following assert is hitting 2722 hn_txdesc_put(struct hn_tx_ring *txr, struct hn_txdesc *txd) 2723 { 2724 2725 KASSERT((txd->flags & HN_TXD_FLAG_ONLIST) =3D=3D 0, This txd is dequeued from txd =3D buf_ring_dequeue_sc(txr->hn_txdesc_br); and getting enqueued hn_txdesc_put() after txd getting reseted . --=20 You are receiving this mail because: You are the assignee for the bug.=
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