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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=rGdOKdDA5RpXluB9z2U22QsKLkSWFOvR+63KB4VJ+vY=; b=KzTd2mw9nfPDlwCUWZOiKQ03iWgRf/d3maaJ3GG0Poq4tzVktZrt8YRkR/L4WWzSJE AYDBWKOn+Vj2W5kQA+mHvobgfYOLkMRvzxaU47orxHx7w1/8vSGRcikZaDxboOsfCBRl HO88exMnxKlke1a4MK7xxEEr9yNvgGVunBkay1H2IH24EKNEiAa4qoFIjNhTuJqc56NM N2+HhR0AzGnEmLmh4KnVhTmW4vtdCcauRkK5bSwCe/JnJokd+oBOw+iByC0ZbsOxDWVa WhwaxRl/DrfOF/NSh4dCrhH0RfC/JcPuMe1TmhkB59bSTO5pgBaJZl6OnHOyghqzpf6s HHAQ== X-Gm-Message-State: APjAAAWj0WU2Q1Elrk+RkyRoMHQYiPHYuPM/FVy0U+IFU0TLfUBrah5e 7uj2zTm999CUImGPXF5cqKlf910Co/d2r8J5z63CnQ== X-Google-Smtp-Source: APXvYqwBqYbFMrESI6D2QPp5yv9MtP1XINaTERQ/O2UVIZpcx/ulWvWMMb/nHj0ilK2Z2YQVuWwfK30Ej6P8jPvGnL0= X-Received: by 2002:a25:30c5:: with SMTP id w188mr209299ybw.122.1578411686461; Tue, 07 Jan 2020 07:41:26 -0800 (PST) MIME-Version: 1.0 References: <20191226174733.GA513665@chuupie.wdl.wdc.com> In-Reply-To: From: Stefan Majer Date: Tue, 7 Jan 2020 16:41:15 +0100 Message-ID: Subject: Re: null pointer dereference in nvme_tcp_io_work To: sagi grimberg X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200107_074128_733384_0319A00C X-CRM114-Status: GOOD ( 26.37 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Keith Busch , linux-nvme Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org Hi, is there anything i can help with to further nail down the problem ? please let me know. Stefan On Sat, Dec 28, 2019 at 6:53 PM Stefan Majer wrote: > > I have to add: > > ./faddr2line /var/lib/debug/lib/modules/5.3.0-24-generic/kernel/drivers/nvme/host/nvme-tcp.ko > nvme_tcp_io_work+0x341/0x7f0 > nvme_tcp_io_work+0x341/0x7f0: > nvme_tcp_req_cur_length at > /build/linux-4AS01l/linux-5.3.0/drivers/nvme/host/tcp.c:189 > (inlined by) nvme_tcp_try_send_data at > /build/linux-4AS01l/linux-5.3.0/drivers/nvme/host/tcp.c:854 > (inlined by) nvme_tcp_try_send at > /build/linux-4AS01l/linux-5.3.0/drivers/nvme/host/tcp.c:1011 > (inlined by) nvme_tcp_io_work at > /build/linux-4AS01l/linux-5.3.0/drivers/nvme/host/tcp.c:1048 > > On Sat, Dec 28, 2019 at 6:49 PM Stefan Majer wrote: > > > > Hi, > > > > took a while, but now reproduced with ubuntu-19.10 kernel 5.3.x i > > installed the debug symbols and ran decodestacktrace.sh from kernel > > sources which gives me: > > > > [ 29.266954] nvme nvme0: new ctrl: NQN > > "nqn.2014-08.org.nvmexpress.discovery", addr 192.168.22.1:4420 > > [ 29.267477] nvme nvme0: Removing ctrl: NQN > > "nqn.2014-08.org.nvmexpress.discovery" > > [ 29.285732] nvme nvme0: creating 1 I/O queues. > > [ 29.286632] nvme nvme0: mapped 1/0 default/read queues. > > [ 29.288565] nvme nvme0: new ctrl: NQN "nvmet-test", addr > > 192.168.22.1:4420 > > [ 29.293146] nvme0n1: detected capacity change from 0 to 1084227584 > > [ 39.196846] BUG: kernel NULL pointer dereference, address: > > 0000000000000008 > > [ 39.198524] #PF: supervisor read access in kernel mode > > [ 39.199786] #PF: error_code(0x0000) - not-present page > > [ 39.201198] PGD 0 P4D 0 > > [ 39.201849] Oops: 0000 [#1] SMP PTI > > [ 39.202679] CPU: 0 PID: 223 Comm: kworker/0:1H Kdump: loaded Not > > tainted 5.3.0-24-generic #26-Ubuntu > > [ 39.204830] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), > > BIOS 0.0.0 02/06/2015 > > [ 39.207205] Workqueue: nvme_tcp_wq nvme_tcp_io_work [nvme_tcp] > > [ 39.209005] RIP: 0010:nvme_tcp_io_work+0x341/0x7f0 nvme_tcp > > [ 39.210686] Code: 8b 87 98 00 00 00 83 f8 02 0f 85 34 fd ff ff 49 8b > > 47 28 4d 89 fe 48 89 45 a8 49 8b 46 78 49 8b 56 68 45 8b 66 34 45 2b > > 66 38 <8b> 58 08 8b 48 0c 4c 8b 28 48 29 d3 48 8d 34 11 4c 39 e3 48 89 > > 75 > > All code > > ======== > > 0: 8b 87 98 00 00 00 mov 0x98(%rdi),%eax > > 6: 83 f8 02 cmp $0x2,%eax > > 9: 0f 85 34 fd ff ff jne 0xfffffffffffffd43 > > f: 49 8b 47 28 mov 0x28(%r15),%rax > > 13: 4d 89 fe mov %r15,%r14 > > 16: 48 89 45 a8 mov %rax,-0x58(%rbp) > > 1a: 49 8b 46 78 mov 0x78(%r14),%rax > > 1e: 49 8b 56 68 mov 0x68(%r14),%rdx > > 22: 45 8b 66 34 mov 0x34(%r14),%r12d > > 26: 45 2b 66 38 sub 0x38(%r14),%r12d > > 2a:* 8b 58 08 mov 0x8(%rax),%ebx <-- > > trapping instruction > > 2d: 8b 48 0c mov 0xc(%rax),%ecx > > 30: 4c 8b 28 mov (%rax),%r13 > > 33: 48 29 d3 sub %rdx,%rbx > > 36: 48 8d 34 11 lea (%rcx,%rdx,1),%rsi > > 3a: 4c 39 e3 cmp %r12,%rbx > > 3d: 48 rex.W > > 3e: 89 .byte 0x89 > > 3f: 75 .byte 0x75 > > > > Code starting with the faulting instruction > > =========================================== > > 0: 8b 58 08 mov 0x8(%rax),%ebx > > 3: 8b 48 0c mov 0xc(%rax),%ecx > > 6: 4c 8b 28 mov (%rax),%r13 > > 9: 48 29 d3 sub %rdx,%rbx > > c: 48 8d 34 11 lea (%rcx,%rdx,1),%rsi > > 10: 4c 39 e3 cmp %r12,%rbx > > 13: 48 rex.W > > 14: 89 .byte 0x89 > > 15: 75 .byte 0x75 > > [ 39.216464] RSP: 0018:ffffb0f8c0453dd8 EFLAGS: 00010206 > > [ 39.218053] RAX: 0000000000000000 RBX: 00000000b4e42801 RCX: 0000000000000000 > > [ 39.219803] RDX: 0000000000000000 RSI: 0000000000000011 RDI: ffff9dd8e6e49478 > > [ 39.221766] RBP: ffffb0f8c0453e60 R08: 0000000000001000 R09: 0000000002800809 > > [ 39.223635] R10: 0000000000000009 R11: 0000000000000000 R12: 0000000000001000 > > [ 39.226010] R13: 0000000000000048 R14: ffff9dd8e6e49418 R15: ffff9dd8e6e49418 > > [ 39.228992] FS: 0000000000000000(0000) GS:ffff9dd8ff600000(0000) > > knlGS:0000000000000000 > > [ 39.233660] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [ 39.237863] CR2: 0000000000000008 CR3: 0000000067c6a005 CR4: 0000000000360ef0 > > [ 39.241807] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > [ 39.244496] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > [ 39.246569] Call Trace: > > [ 39.247272] process_one_work > > (/build/linux-4AS01l/linux-5.3.0/arch/x86/include/asm/jump_label.h:25 > > /build/linux-4AS01l/linux-5.3.0/include/linux/jump_label.h:200 > > /build/linux-4AS01l/linux-5.3.0/include/trace/events/workqueu > > e.h:114 /build/linux-4AS01l/linux-5.3.0/kernel/workqueue.c:2274) > > [ 39.248361] worker_thread > > (/build/linux-4AS01l/linux-5.3.0/include/linux/compiler.h:199 > > /build/linux-4AS01l/linux-5.3.0/include/linux/list.h:268 > > /build/linux-4AS01l/linux-5.3.0/kernel/workqueue.c:2416) > > [ 39.249364] kthread (/build/linux-4AS01l/linux-5.3.0/kernel/kthread.c:255) > > [ 39.250243] ? process_one_work > > (/build/linux-4AS01l/linux-5.3.0/kernel/workqueue.c:2358) > > [ 39.251485] ? kthread_park > > (/build/linux-4AS01l/linux-5.3.0/kernel/kthread.c:215) > > [ 39.252474] ret_from_fork > > (/build/linux-4AS01l/linux-5.3.0/arch/x86/entry/entry_64.S:358) > > [ 39.253476] Modules linked in: nvme_tcp nvme_fabrics nvme nvme_core > > xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user > > xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack > > nf_defrag_ipv6 nf_ > > defrag_ipv4 libcrc32c bpfilter br_netfilter bridge stp llc aufs > > overlay intel_rapl_msr intel_rapl_common kvm_intel kvm irqbypass > > crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel > > aes_x86_64 crypto_simd cirrus nls_i > > so8859_1 cryptd glue_helper drm_kms_helper drm input_leds joydev > > fb_sys_fops serio_raw syscopyarea sysfillrect sysimgblt mac_hid > > qemu_fw_cfg bonding sch_fq_codel ipmi_watchdog ipmi_devintf > > ipmi_msghandler virtio_rng ip_tables > > x_tables autofs4 psmouse virtio_net net_failover failover ahci libahci > > i2c_piix4 pata_acpi floppy > > [ 39.269809] CR2: 0000000000000008 > > > > greetings > > Stefan > > > > On Fri, Dec 27, 2019 at 8:54 AM Stefan Majer wrote: > > > > > > Hi, > > > > > > no problem, i am also on vacation. > > > > > > the issue is not reproducible in a pure bare metal environment, target > > > and host are physical machines. > > > The environment where it happens both machines are kvm based. > > > > > > I first have to figure out howto gdb on the kernel crash, thats not my > > > daily jobs, so please be patient. > > > > > > Greetings > > > Stefan > > > > > > On Fri, Dec 27, 2019 at 8:49 AM sagi grimberg wrote: > > > > > > > > Hey, > > > > > > > > On vacation so not able to take a look right now, but can you provide a line info from gdb on the RIP line? > > > > > > > > Also, did you say that the issue is not reproducible when the host is on bare metal but only on kvm? ( You said the target, but I'm asking about the host). > > > > > > > > On Thu, Dec 26, 2019, 23:18 Stefan Majer wrote: > > > >> > > > >> Hi, > > > >> > > > >> i have to add that doing the same on bare metal does work without any problems. > > > >> I suspect that this is probably caused by the fact that in the above > > > >> example my target is a qemu-kvm machine with a emulated nvme device. > > > >> Greetings > > > >> Stefan > > > >> > > > >> On Thu, Dec 26, 2019 at 6:47 PM Keith Busch wrote: > > > >> > > > > >> > Adding Sagi. > > > >> > > > > >> > On Wed, Dec 25, 2019 at 11:06:17AM +0100, Stefan Majer wrote: > > > >> > > Hi, > > > >> > > > > > >> > > im trying to setup a nvme-over-tcp test environment with a qemu-kvm > > > >> > > based nvmet-tcp target based on ubuntu-19.10 and a ubuntu-19.10 host > > > >> > > with kernel 5.4.6 installed. Kernel was taken from > > > >> > > https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.4.6/ . Same Panic > > > >> > > occurs with ubuntu 19.10 kernel 5.3.x > > > >> > > > > > >> > > After setup the target i can discover and connect the exported nvme > > > >> > > device on the host with: > > > >> > > modprobe nvme > > > >> > > modprobe nvme-tcp > > > >> > > nvme discover -t tcp -a 192.168.22.1 -s 4420 > > > >> > > nvme connect -t tcp -n nvmet-test -a 192.168.22.1 -s 4420 > > > >> > > > > > >> > > No errors so far, but when i try to format the device with: > > > >> > > > > > >> > > mkfs.ext4 /dev/nvme0n1 > > > >> > > > > > >> > > The kernel panics with: > > > >> > > Writing inode tables: > > > >> > > [ 692.651243] BUG: kernel NULL pointer dereference, address: 0000000000000008 > > > >> > > [ 692.653158] #PF: supervisor read access in kernel mode > > > >> > > [ 692.653922] #PF: error_code(0x0000) - not-present page > > > >> > > [ 692.653922] PGD 0 P4D 0 > > > >> > > [ 692.653922] Oops: 0000 [#1] SMP PTI > > > >> > > [ 692.653922] CPU: 0 PID: 224 Comm: kworker/0:1H Not tainted > > > >> > > 5.4.6-050406-generic #201912211140 > > > >> > > [ 692.653922] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), > > > >> > > BIOS 0.0.0 02/06/2015 > > > >> > > [ 692.653922] Workqueue: nvme_tcp_wq nvme_tcp_io_work [nvme_tcp] > > > >> > > [ 692.653922] RIP: 0010:nvme_tcp_io_work+0x308/0x790 [nvme_tcp] > > > >> > > [ 692.653922] Code: 8b 86 98 00 00 00 83 f8 02 0f 85 6d fd ff ff 49 > > > >> > > 8b 46 28 4d 89 f7 48 89 45 a8 49 8b 47 78 49 8b 57 68 45 8b 67 34 45 > > > >> > > 2b 67 38 <8b> 58 08 8b 48 0c 4c 8b 28 48 29 d3 48 8d 34 11 4c 39 e3 48 > > > >> > > 89 75 > > > >> > > [ 692.653922] RSP: 0018:ffffa49a00447dd8 EFLAGS: 00010206 > > > >> > > [ 692.653922] RAX: 0000000000000000 RBX: 0000000077bd3601 RCX: 0000000000000000 > > > >> > > [ 692.653922] RDX: 0000000000000000 RSI: 0000000000000011 RDI: ffff9376781c0500 > > > >> > > [ 692.653922] RBP: ffffa49a00447e60 R08: 0000000000001000 R09: 0000000005000809 > > > >> > > [ 692.653922] R10: 0000000000000009 R11: 0000000000000000 R12: 0000000000001000 > > > >> > > [ 692.653922] R13: 0000000000000048 R14: ffff9376781c04a0 R15: ffff9376781c04a0 > > > >> > > [ 692.653922] FS: 0000000000000000(0000) GS:ffff93767f600000(0000) > > > >> > > knlGS:0000000000000000 > > > >> > > [ 692.653922] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > >> > > [ 692.653922] CR2: 0000000000000008 CR3: 000000007b488003 CR4: 0000000000360ef0 > > > >> > > [ 692.653922] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > > >> > > [ 692.653922] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > >> > > [ 692.653922] Call Trace: > > > >> > > [ 692.653922] process_one_work+0x1ec/0x3a0 > > > >> > > [ 692.653922] worker_thread+0x4d/0x400 > > > >> > > [ 692.653922] kthread+0x104/0x140 > > > >> > > [ 692.653922] ? process_one_work+0x3a0/0x3a0 > > > >> > > [ 692.653922] ? kthread_park+0x90/0x90 > > > >> > > [ 692.653922] ret_from_fork+0x35/0x40 > > > >> > > [ 692.653922] Modules linked in: binfmt_misc nvme_tcp nvme_fabrics > > > >> > > nvme nvme_core xt_conntrack xt_MASQUERADE nf_conntrack_netlink > > > >> > > nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat > > > >> > > nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c bpfilter > > > >> > > br_netfilter bridge stp llc overlay intel_rapl_msr intel_rapl_common > > > >> > > kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul > > > >> > > ghash_clmulni_intel aesni_intel nls_iso8859_1 crypto_simd cryptd > > > >> > > cirrus glue_helper drm_kms_helper drm input_leds fb_sys_fops joydev > > > >> > > serio_raw syscopyarea sysfillrect sysimgblt mac_hid qemu_fw_cfg > > > >> > > bonding sch_fq_codel ipmi_watchdog ipmi_devintf ipmi_msghandler > > > >> > > virtio_rng ip_tables x_tables autofs4 ahci psmouse virtio_net > > > >> > > net_failover failover libahci i2c_piix4 pata_acpi floppy > > > >> > > [ 692.653922] CR2: 0000000000000008 > > > >> > > [ 692.653922] ---[ end trace d688c2c182feef87 ]--- > > > >> > > [ 692.653922] RIP: 0010:nvme_tcp_io_work+0x308/0x790 [nvme_tcp] > > > >> > > [ 692.653922] Code: 8b 86 98 00 00 00 83 f8 02 0f 85 6d fd ff ff 49 > > > >> > > 8b 46 28 4d 89 f7 48 89 45 a8 49 8b 47 78 49 8b 57 68 45 8b 67 34 45 > > > >> > > 2b 67 38 <8b> 58 08 8b 48 0c 4c 8b 28 48 29 d3 48 8d 34 11 4c 39 e3 48 > > > >> > > 89 75 > > > >> > > [ 692.653922] RSP: 0018:ffffa49a00447dd8 EFLAGS: 00010206 > > > >> > > [ 692.653922] RAX: 0000000000000000 RBX: 0000000077bd3601 RCX: 0000000000000000 > > > >> > > [ 692.653922] RDX: 0000000000000000 RSI: 0000000000000011 RDI: ffff9376781c0500 > > > >> > > [ 692.653922] RBP: ffffa49a00447e60 R08: 0000000000001000 R09: 0000000005000809 > > > >> > > [ 692.653922] R10: 0000000000000009 R11: 0000000000000000 R12: 0000000000001000 > > > >> > > [ 692.653922] R13: 0000000000000048 R14: ffff9376781c04a0 R15: ffff9376781c04a0 > > > >> > > [ 692.653922] FS: 0000000000000000(0000) GS:ffff93767f600000(0000) > > > >> > > knlGS:0000000000000000 > > > >> > > [ 692.653922] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > >> > > [ 692.653922] CR2: 0000000000000008 CR3: 000000007b488003 CR4: 0000000000360ef0 > > > >> > > [ 692.653922] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > > >> > > [ 692.653922] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > >> > > > > > >> > > > > > >> > > Any help appreciated. > > > >> > > > > > >> > > Greetings > > > >> > > > > > >> > > -- > > > >> > > Stefan Majer > > > >> > > > >> > > > >> > > > >> -- > > > >> Stefan Majer > > > > > > > > > > > > -- > > > Stefan Majer > > > > > > > > -- > > Stefan Majer > > > > -- > Stefan Majer -- Stefan Majer _______________________________________________ linux-nvme mailing list linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme