Backtrace

WARNING: CPU: 0 PID: 587 at drivers/net/usb/hso.c:1243 hso_serial_open+0x15e/0x1e0 [hso]
Modules linked in: uinput xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp tun bridge stp llc nft_objref nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security ip_set nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_intel_dspcfg soundwire_intel soundwire_generic_allocation coretemp iwldvm mac80211 snd_soc_core kvm_intel libarc4 sunrpc iwlwifi snd_compress iTCO_wdt ppdev intel_pmc_bxt hso snd_pcm_dmaengine uvcvideo iTCO_vendor_support soundwire_cadence kvm videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 snd_hda_codec videobuf2_common snd_hda_core videodev
 cfg80211 ac97_bus irqbypass snd_hwdep snd_seq acer_wmi snd_seq_device mc joydev snd_pcm pcspkr i2c_i801 sparse_keymap i2c_smbus tifm_7xx1 tifm_core lpc_ich parport_pc rfkill snd_timer parport snd soundcore tpm_infineon acpi_cpufreq zram ip_tables i915 i2c_algo_bit sdhci_pci drm_kms_helper cqhci sdhci firewire_ohci cec drm mmc_core firewire_core serio_raw yenta_socket tg3 crc_itu_t wmi video fuse
CPU: 0 PID: 587 Comm: ModemManager Tainted: G      D W         5.11.14-200.fc33.x86_64 #1
Hardware name: Acer TravelMate 6293/TravelMate 6293, BIOS V1.12 08/28/08
RIP: 0010:hso_serial_open+0x15e/0x1e0 [hso]
Code: 03 48 8b 78 58 e8 f2 15 e9 c6 31 d2 be 06 00 00 00 48 89 ef e8 43 f2 ff ff e9 7b ff ff ff 48 c7 c7 44 a6 9f c0 e8 f2 eb 1e c7 <0f> 0b 48 c7 85 58 02 00 00 00 00 00 00 f6 05 3e 9a 00 00 01 0f 85
RSP: 0018:ffffb47240647c48 EFLAGS: 00010246
RAX: ffff9aef852b8540 RBX: 0000000000000000 RCX: ffff9aef852a7600
RDX: 0000000000000001 RSI: 0000000000000282 RDI: 0000000000000282
RBP: ffff9aef871d0000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: ffff9aef871d0260
R13: ffff9aef852f59c0 R14: ffff9aef871d0000 R15: ffff9aeeaeb07dc0
FS:  00007fef6967d240(0000) GS:ffff9aefbbc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fac5cf6c498 CR3: 0000000101b0e000 CR4: 00000000000006f0
Call Trace:
 tty_open+0x168/0x670
 chrdev_open+0xdd/0x210
 ? cdev_device_add+0x90/0x90
 do_dentry_open+0x14b/0x360
 path_openat+0xa43/0xfc0
 do_filp_open+0x75/0x100
 ? getname_flags.part.0+0x29/0x1a0
 ? __check_object_size+0x136/0x150
 ? alloc_fd+0x51/0x150
 do_sys_openat2+0x7b/0x130
 __x64_sys_openat+0x46/0x70
 do_syscall_64+0x33/0x40
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fef69c23214
Code: 24 20 eb 8f 66 90 44 89 54 24 0c e8 86 42 f9 ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 d8 42 f9 ff 8b 44
RSP: 002b:00007fffb74cad80 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fef6967d148 RCX: 00007fef69c23214
RDX: 0000000000000982 RSI: 000055b9c059f980 RDI: 00000000ffffff9c
RBP: 000055b9c059f980 R08: 0000000000000000 R09: 00007fef69c73160
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000982
R13: 0000000000000000 R14: 000055b9c05a4c40 R15: 000055b9c059f980