Backtrace

WARNING: CPU: 0 PID: 877 at kernel/rcu/tree_plugin.h:316 rcu_note_context_switch+0x594/0x5d0
Modules linked in: hid_apple hidp rfcomm snd_seq_dummy snd_hrtimer nf_conntrack_netlink xt_addrtype br_netfilter xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp bridge stp llc rpcrdma rdma_cm iw_cm ib_cm ib_core 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 overlay nfnetlink ip6table_filter ip6_tables iptable_filter qrtr bnep binfmt_misc vfat fat squashfs loop intel_rapl_msr mei_wdt iTCO_wdt intel_pmc_bxt ppdev mei_hdcp iTCO_vendor_support intel_rapl_common mei_pxp x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm dell_laptop dell_smm_hwmon irqbypass rapl intel_cstate intel_uncore iwlmvm btusb dell_wmi btrtl mac80211
 btbcm snd_hda_codec_realtek pcspkr dell_smbios snd_hda_codec_generic snd_hda_codec_hdmi dcdbas ledtrig_audio btintel sparse_keymap wmi_bmof libarc4 uvcvideo bluetooth snd_hda_intel dell_wmi_descriptor snd_intel_dspcfg snd_intel_sdw_acpi videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common snd_hda_codec snd_usb_audio iwlwifi snd_usbmidi_lib ecdh_generic videodev snd_rawmidi joydev cfg80211 snd_hda_core mc snd_hwdep snd_seq i2c_i801 i2c_smbus lpc_ich snd_seq_device snd_pcm snd_timer mei_me snd mei soundcore parport_pc parport dell_rbtn dell_smo8800 rfkill nfsd auth_rpcgss nfs_acl lockd grace sunrpc zram ip_tables i915 i2c_algo_bit ttm drm_kms_helper cec drm crct10dif_pclmul crc32_pclmul crc32c_intel sdhci_pci e1000e cqhci ghash_clmulni_intel sdhci mmc_core serio_raw wmi video ipmi_devintf ipmi_msghandler fuse
CPU: 0 PID: 877 Comm: bluetoothd Tainted: G      D           5.16.12-200.fc35.x86_64 #1
Hardware name: Dell Inc. Latitude E5440/061CGT, BIOS A23 10/08/2018
RIP: 0010:rcu_note_context_switch+0x594/0x5d0
Code: 08 4d 89 be 40 08 00 00 49 89 b6 48 08 00 00 48 89 3e e9 6f fd ff ff 48 c7 c7 c0 2e 5e bc c6 05 a3 61 fb 01 01 e8 7f 2c ad 00 <0f> 0b e9 c3 fa ff ff 0f 0b e9 9f fc ff ff 0f 0b e9 a1 fd ff ff 0f
RSP: 0018:ffffa02e00db3d28 EFLAGS: 00010092
RAX: 000000000000003f RBX: ffff915912a32400 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffffbc63494d RDI: 00000000ffffffff
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffa02e00db3b68
R10: ffffa02e00db3b60 R11: ffffffffbcf462a8 R12: ffffa02e00db3e40
R13: ffff91571b438000 R14: ffff915912a31640 R15: ffff91571b438000
FS:  0000000000000000(0000) GS:ffff915912a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000013ae10004 CR4: 00000000001706f0
Call Trace:
 <TASK>
 ? check_preempt_curr+0x55/0x70
 __schedule+0x9e/0xfa0
 ? preempt_count_add+0x68/0xa0
 ? _raw_spin_lock_irqsave+0x26/0x50
 schedule+0x4e/0xc0
 synchronize_rcu_expedited+0x1ec/0x320
 ? kvfree_call_rcu+0x2b0/0x2b0
 ? do_wait_intr_irq+0xa0/0xa0
 ? umount_tree+0x227/0x320
 namespace_unlock+0xaa/0x170
 put_mnt_ns+0x67/0x90
 free_nsproxy+0x17/0x1b0
 do_exit+0x35f/0xb40
 ? exit_to_user_mode_prepare+0x229/0x230
 rewind_stack_do_exit+0x17/0x17
RIP: 0033:0x7f2c76594ef7
Code: Unable to access opcode bytes at RIP 0x7f2c76594ecd.
RSP: 002b:00007fffa77dab78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 000055ff93b26800 RCX: 00007f2c76594ef7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000001c
RBP: 0000000000000000 R08: 000055ff93b25580 R09: 0000000000000015
R10: 0000000000000030 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
 </TASK>