I'm not sure with which rc I first saw this appear. I don't recalling seeing it with 5.11 series. There's nothing unusual reported during the subsequent reboot.
[16212.441466] kernel: dnf (7568) used greatest stack depth: 10752 bytes left [16332.569785] kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7 [16337.349525] kernel: rfkill: input handler enabled [16339.203377] kernel: BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! [16339.203439] kernel: turning off the locking correctness validator. [16339.203491] kernel: Please attach the output of /proc/lock_stat to the bug report [16339.203555] kernel: CPU: 2 PID: 5625 Comm: signal-desktop Not tainted 5.12.0-0.rc7.189.fc35.x86_64+debug #1 [16339.203636] kernel: Hardware name: HP HP Spectre Notebook/81A0, BIOS F.44 11/25/2019 [16339.203698] kernel: Call Trace: [16339.203723] kernel: dump_stack+0x7f/0xa1 [16339.203762] kernel: __lock_acquire.cold+0x1a9/0x2bf [16339.203810] kernel: lock_acquire+0xc4/0x3a0 [16339.203850] kernel: ? __delayacct_thrashing_end+0x36/0x60 [16339.203898] kernel: ? mark_held_locks+0x50/0x80 [16339.203938] kernel: _raw_spin_lock_irqsave+0x4d/0x90 [16339.203981] kernel: ? __delayacct_thrashing_end+0x36/0x60 [16339.204030] kernel: __delayacct_thrashing_end+0x36/0x60 [16339.204077] kernel: wait_on_page_bit_common+0x38e/0x490 [16339.204125] kernel: ? add_page_wait_queue+0xf0/0xf0 [16339.204170] kernel: read_extent_buffer_pages+0x55e/0x610 [16339.204222] kernel: btree_read_extent_buffer_pages+0x97/0x110 [16339.204277] kernel: read_tree_block+0x39/0x60 [16339.204314] kernel: btrfs_read_node_slot+0xe3/0x130 [16339.204358] kernel: push_leaf_left+0x98/0x190 [16339.204400] kernel: btrfs_del_items+0x2ba/0x440 [16339.204446] kernel: btrfs_truncate_inode_items+0x254/0xfc0 [16339.204499] kernel: ? _raw_spin_unlock+0x1f/0x30 [16339.204542] kernel: ? btrfs_block_rsv_migrate+0x6d/0xb0 [16339.204589] kernel: btrfs_evict_inode+0x3fe/0x4e0 [16339.204631] kernel: evict+0xcf/0x1d0 [16339.204662] kernel: __dentry_kill+0xe8/0x190 [16339.204697] kernel: ? dput+0x20/0x480 [16339.204729] kernel: dput+0x2b8/0x480 [16339.204758] kernel: __fput+0x102/0x260 [16339.204792] kernel: task_work_run+0x5c/0xa0 [16339.204830] kernel: do_exit+0x3e1/0xc20 [16339.204864] kernel: ? find_held_lock+0x32/0x90 [16339.204903] kernel: ? sched_clock+0x5/0x10 [16339.204938] kernel: ? sched_clock_cpu+0xc/0xb0 [16339.204977] kernel: do_group_exit+0x39/0xb0 [16339.205008] kernel: get_signal+0x16f/0xb00 [16339.205037] kernel: arch_do_signal_or_restart+0xfc/0x750 [16339.205075] kernel: ? finish_task_switch.isra.0+0xa0/0x2c0 [16339.205120] kernel: ? finish_task_switch.isra.0+0x6a/0x2c0 [16339.205165] kernel: ? do_user_addr_fault+0x1ea/0x6b0 [16339.205208] kernel: exit_to_user_mode_prepare+0x15d/0x240 [16339.205253] kernel: ? asm_exc_page_fault+0x8/0x30 [16339.205296] kernel: irqentry_exit_to_user_mode+0x5/0x40 [16339.205343] kernel: asm_exc_page_fault+0x1e/0x30 [16339.205383] kernel: RIP: 0033:0x7f49d11b6674 [16339.205421] kernel: Code: Unable to access opcode bytes at RIP 0x7f49d11b664a. [16339.205481] kernel: RSP: 002b:00007f49ce07f250 EFLAGS: 00010206 [16339.205530] kernel: RAX: 000055593f9bc088 RBX: 00007f49d11d9140 RCX: 000000000000084e [16339.205602] kernel: RDX: 0000000000000c4e RSI: 000000000099c84e RDI: 00000000267213a2 [16339.205664] kernel: RBP: 0000000000000000 R08: 00007f49ce07f390 R09: 00007f49d11d9400 [16339.205720] kernel: R10: 00007f49d11aa540 R11: 000000000000005a R12: 000000000000005a [16339.205781] kernel: R13: 00007f49ce1c5688 R14: 0000000000000001 R15: 0000000000000000 [16339.626109] kernel: wlp108s0: deauthenticating from f8:a0:97:6e:c7:e8 by local choice (Reason: 3=DEAUTH_LEAVING) [16340.238863] kernel: kauditd_printk_skb: 93 callbacks suppressed -- Chris Murphy
