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Date: Tue, 13 Sep 2022 23:22:24 +0200 From: Roberto Ricci <rroberto2r@...il.com> To: davem@...emloft.net, yoshfuji@...ux-ipv6.org, dsahern@...nel.org Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: BUG: unable to handle page fault for address, with ipv6.disable=1 Executing the `ss` command in a system with kernel 5.19.8, booted with the "ipv6.disable=1" parameter, causes this oops: [ 74.952477] BUG: unable to handle page fault for address: ffffffffffffffc8 [ 74.952568] #PF: supervisor read access in kernel mode [ 74.952632] #PF: error_code(0x0000) - not-present page [ 74.952695] PGD 25814067 P4D 25814067 PUD 25816067 PMD 0 [ 74.952770] Oops: 0000 [#1] PREEMPT SMP PTI [ 74.952816] CPU: 0 PID: 704 Comm: ss Not tainted 5.19.8_1 #1 [ 74.952869] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 WARNING! Modules path isn't set, but is needed to parse this symbol [ 74.953292] RIP: 0010:raw_diag_dump+0xea/0x1d0 raw_diag [ 74.953379] Code: c3 89 44 24 24 4c 89 e8 41 89 ed 49 89 c7 48 8b 04 24 48 8b 58 08 89 dd 83 e5 01 74 0d e9 d5 00 00 00 48 8b 1b f6 c3 01 75 7f <4c> 3b 63 c8 75 f2 44 39 ed 7c 69 41 0f b6 07 66 39 43 a8 75 5f 41 All code ======== 0: c3 retq 1: 89 44 24 24 mov %eax,0x24(%rsp) 5: 4c 89 e8 mov %r13,%rax 8: 41 89 ed mov %ebp,%r13d b: 49 89 c7 mov %rax,%r15 e: 48 8b 04 24 mov (%rsp),%rax 12: 48 8b 58 08 mov 0x8(%rax),%rbx 16: 89 dd mov %ebx,%ebp 18: 83 e5 01 and $0x1,%ebp 1b: 74 0d je 0x2a 1d: e9 d5 00 00 00 jmpq 0xf7 22: 48 8b 1b mov (%rbx),%rbx 25: f6 c3 01 test $0x1,%bl 28: 75 7f jne 0xa9 2a:* 4c 3b 63 c8 cmp -0x38(%rbx),%r12 <-- trapping instruction 2e: 75 f2 jne 0x22 30: 44 39 ed cmp %r13d,%ebp 33: 7c 69 jl 0x9e 35: 41 0f b6 07 movzbl (%r15),%eax 39: 66 39 43 a8 cmp %ax,-0x58(%rbx) 3d: 75 5f jne 0x9e 3f: 41 rex.B Code starting with the faulting instruction =========================================== 0: 4c 3b 63 c8 cmp -0x38(%rbx),%r12 4: 75 f2 jne 0xfffffffffffffff8 6: 44 39 ed cmp %r13d,%ebp 9: 7c 69 jl 0x74 b: 41 0f b6 07 movzbl (%r15),%eax f: 66 39 43 a8 cmp %ax,-0x58(%rbx) 13: 75 5f jne 0x74 15: 41 rex.B [ 74.953617] RSP: 0018:ffffbb8740af7908 EFLAGS: 00010246 [ 74.953668] RAX: ffffffff9d22e680 RBX: 0000000000000000 RCX: 000000000000000c [ 74.953729] RDX: 0000000000000000 RSI: ffffffff9d22e680 RDI: 0000000000000000 [ 74.953788] RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000034f2b [ 74.953848] R10: ffff9f1bcb598000 R11: 0000000000000000 R12: ffffffff9d225a40 [ 74.953907] R13: 0000000000000000 R14: 0000000000000000 R15: ffff9f1bc6474610 [ 74.953967] FS: 00007f66aab55740(0000) GS:ffff9f1bfec00000(0000) knlGS:0000000000000000 [ 74.954069] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.954120] CR2: ffffffffffffffc8 CR3: 000000002fe1e000 CR4: 00000000000006f0 [ 74.954188] Call Trace: [ 74.954221] <TASK> [ 74.954248] __inet_diag_dump (net/ipv4/inet_diag.c:1179) [ 74.954462] netlink_dump (net/netlink/af_netlink.c:2276) [ 74.954549] __netlink_dump_start (net/netlink/af_netlink.c:2380) [ 74.954613] inet_diag_handler_cmd (net/ipv4/inet_diag.c:1347) [ 74.954672] ? inet_diag_dump_start_compat (net/ipv4/inet_diag.c:1244) [ 74.954725] ? inet_diag_dump_compat (net/ipv4/inet_diag.c:1197) [ 74.954768] ? inet_diag_unregister (net/ipv4/inet_diag.c:1254) [ 74.954811] sock_diag_rcv_msg (net/core/sock_diag.c:235 net/core/sock_diag.c:266) [ 74.954905] ? sock_diag_bind (net/core/sock_diag.c:247) [ 74.954950] netlink_rcv_skb (net/netlink/af_netlink.c:2501) [ 74.954993] sock_diag_rcv (net/core/sock_diag.c:278) [ 74.955032] netlink_unicast (net/netlink/af_netlink.c:1320 net/netlink/af_netlink.c:1345) [ 74.955074] netlink_sendmsg (net/netlink/af_netlink.c:1921) [ 74.955116] sock_sendmsg (net/socket.c:714 net/socket.c:734) [ 74.955199] ____sys_sendmsg (net/socket.c:2488) [ 74.955245] ? import_iovec (lib/iov_iter.c:2008) [ 74.955302] ? sendmsg_copy_msghdr (net/socket.c:2429 net/socket.c:2519) [ 74.955348] ___sys_sendmsg (net/socket.c:2544) [ 74.955447] ? __schedule (kernel/sched/core.c:6476) [ 74.955522] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:103 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) [ 74.955583] ? do_notify_parent_cldstop (kernel/signal.c:2191) [ 74.955656] ? preempt_count_add (./include/linux/ftrace.h:910 kernel/sched/core.c:5598 kernel/sched/core.c:5595 kernel/sched/core.c:5623) [ 74.955712] ? _raw_spin_lock_irq (./arch/x86/include/asm/atomic.h:202 ./include/linux/atomic/atomic-instrumented.h:543 ./include/asm-generic/qspinlock.h:111 ./include/linux/spinlock.h:185 ./include/linux/spinlock_api_smp.h:120 kernel/locking/spinlock.c:170) [ 74.955752] ? ptrace_stop.part.0 (kernel/signal.c:2331) [ 74.955795] __sys_sendmsg (./include/linux/file.h:31 net/socket.c:2573) [ 74.955835] do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) [ 74.955914] ? syscall_exit_to_user_mode (./arch/x86/include/asm/jump_label.h:55 ./arch/x86/include/asm/nospec-branch.h:382 ./arch/x86/include/asm/entry-common.h:94 kernel/entry/common.c:133 kernel/entry/common.c:296) [ 74.955965] ? do_syscall_64 (arch/x86/entry/common.c:87) [ 74.957786] ? do_syscall_64 (arch/x86/entry/common.c:87) [ 74.959896] ? handle_mm_fault (mm/memory.c:5144) [ 74.961184] ? do_user_addr_fault (arch/x86/mm/fault.c:1422) [ 74.962609] ? fpregs_assert_state_consistent (arch/x86/kernel/fpu/context.h:39 arch/x86/kernel/fpu/core.c:772) [ 74.964171] ? exit_to_user_mode_prepare (./arch/x86/include/asm/entry-common.h:57 kernel/entry/common.c:203) [ 74.965968] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) [ 74.967266] RIP: 0033:0x7f66aac577d3 [ 74.968499] Code: 64 89 02 48 c7 c0 ff ff ff ff eb b7 66 2e 0f 1f 84 00 00 00 00 00 90 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 89 54 24 1c 48 All code ======== 0: 64 89 02 mov %eax,%fs:(%rdx) 3: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax a: eb b7 jmp 0xffffffffffffffc3 c: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 13: 00 00 00 16: 90 nop 17: 64 8b 04 25 18 00 00 mov %fs:0x18,%eax 1e: 00 1f: 85 c0 test %eax,%eax 21: 75 14 jne 0x37 23: b8 2e 00 00 00 mov $0x2e,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 55 ja 0x87 32: c3 retq 33: 0f 1f 40 00 nopl 0x0(%rax) 37: 48 83 ec 28 sub $0x28,%rsp 3b: 89 54 24 1c mov %edx,0x1c(%rsp) 3f: 48 rex.W Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 77 55 ja 0x5d 8: c3 retq 9: 0f 1f 40 00 nopl 0x0(%rax) d: 48 83 ec 28 sub $0x28,%rsp 11: 89 54 24 1c mov %edx,0x1c(%rsp) 15: 48 rex.W [ 74.970741] RSP: 002b:00007ffc6132da68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 74.971846] RAX: ffffffffffffffda RBX: 00007ffc6132dbe0 RCX: 00007f66aac577d3 [ 74.972950] RDX: 0000000000000000 RSI: 00007ffc6132db60 RDI: 0000000000000003 [ 74.974039] RBP: 00000000000000ff R08: 0000000000000014 R09: 0000000000000000 [ 74.975120] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000a [ 74.976883] R13: 00007ffc6132dae0 R14: 0000000000000003 R15: 00007ffc6132db60 [ 74.978531] </TASK> [ 74.980707] Modules linked in: raw_diag unix_diag netlink_diag cfg80211 8021q garp mrp stp llc joydev ppdev intel_agp psmouse intel_gtt i2c_piix4 input_leds pcspkr parport_pc evdev floppy mac_hid parport tiny_power_button snd_seq snd_seq_device snd_timer snd soundcore vhost_vsock vmw_vsock_virtio_transport_common vsock vhost_net vhost vhost_iotlb tap uhid hid hci_vhci bluetooth ecdh_generic rfkill ecc vfio_iommu_type1 vfio uinput userio ppp_generic slhc tun loop nvram cuse fuse ext4 crc16 mbcache jbd2 sr_mod cdrom sd_mod ata_generic pata_acpi ata_piix serio_raw e1000 bochs drm_vram_helper drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm_ttm_helper ttm drm agpgart libata scsi_mod scsi_common qemu_fw_cfg button dm_mirror dm_region_hash dm_log dm_mod btrfs blake2b_generic xor raid6_pq libcrc32c crc32c_generic [ 74.980838] Unloaded tainted modules: pcc_cpufreq():1 acpi_cpufreq():1 crc32c_intel():1 crc32c_intel():1 [ 74.992495] CR2: ffffffffffffffc8 [ 74.994263] ---[ end trace 0000000000000000 ]--- WARNING! Modules path isn't set, but is needed to parse this symbol [ 74.995844] RIP: 0010:raw_diag_dump+0xea/0x1d0 raw_diag [ 74.997239] Code: c3 89 44 24 24 4c 89 e8 41 89 ed 49 89 c7 48 8b 04 24 48 8b 58 08 89 dd 83 e5 01 74 0d e9 d5 00 00 00 48 8b 1b f6 c3 01 75 7f <4c> 3b 63 c8 75 f2 44 39 ed 7c 69 41 0f b6 07 66 39 43 a8 75 5f 41 All code ======== 0: c3 retq 1: 89 44 24 24 mov %eax,0x24(%rsp) 5: 4c 89 e8 mov %r13,%rax 8: 41 89 ed mov %ebp,%r13d b: 49 89 c7 mov %rax,%r15 e: 48 8b 04 24 mov (%rsp),%rax 12: 48 8b 58 08 mov 0x8(%rax),%rbx 16: 89 dd mov %ebx,%ebp 18: 83 e5 01 and $0x1,%ebp 1b: 74 0d je 0x2a 1d: e9 d5 00 00 00 jmpq 0xf7 22: 48 8b 1b mov (%rbx),%rbx 25: f6 c3 01 test $0x1,%bl 28: 75 7f jne 0xa9 2a:* 4c 3b 63 c8 cmp -0x38(%rbx),%r12 <-- trapping instruction 2e: 75 f2 jne 0x22 30: 44 39 ed cmp %r13d,%ebp 33: 7c 69 jl 0x9e 35: 41 0f b6 07 movzbl (%r15),%eax 39: 66 39 43 a8 cmp %ax,-0x58(%rbx) 3d: 75 5f jne 0x9e 3f: 41 rex.B Code starting with the faulting instruction =========================================== 0: 4c 3b 63 c8 cmp -0x38(%rbx),%r12 4: 75 f2 jne 0xfffffffffffffff8 6: 44 39 ed cmp %r13d,%ebp 9: 7c 69 jl 0x74 b: 41 0f b6 07 movzbl (%r15),%eax f: 66 39 43 a8 cmp %ax,-0x58(%rbx) 13: 75 5f jne 0x74 15: 41 rex.B [ 75.000699] RSP: 0018:ffffbb8740af7908 EFLAGS: 00010246 [ 75.001981] RAX: ffffffff9d22e680 RBX: 0000000000000000 RCX: 000000000000000c [ 75.003420] RDX: 0000000000000000 RSI: ffffffff9d22e680 RDI: 0000000000000000 [ 75.004824] RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000034f2b [ 75.006250] R10: ffff9f1bcb598000 R11: 0000000000000000 R12: ffffffff9d225a40 [ 75.007656] R13: 0000000000000000 R14: 0000000000000000 R15: ffff9f1bc6474610 [ 75.009757] FS: 00007f66aab55740(0000) GS:ffff9f1bfec00000(0000) knlGS:0000000000000000 [ 75.012209] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 75.014095] CR2: ffffffffffffffc8 CR3: 000000002fe1e000 CR4: 00000000000006f0 [ 75.015497] note: ss[704] exited with preempt_count 1 I reproduced this with Void Linux x86_64 in a virtual machine. The kernels are those provided by the distribution (Void uses vanilla kernels, I don't believe these very small patches make any difference https://github.com/void-linux/void-packages/tree/0a87c670f35e01a3ac1d850f628fe1bab5d3c433/srcpkgs/linux5.19/patches). Kernels 5.19.8 and 5.18.19 are affected, 5.16.20 is not. I don't know about 5.17.x because Void doesn't package it. The iproute2 version is 5.16.0 (but this also happens with 5.19.0). I attach the kernel config, the full dmesg and the output of `strace ss`. Sorry if you received a duplicate of this email. I sent another berfore and the server didn't like it. View attachment "config" of type "text/plain" (254957 bytes) View attachment "dmesg" of type "text/plain" (35288 bytes) View attachment "strace_ss" of type "text/plain" (11724 bytes)
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