5.12-rc7 occasional btrfs splat when rebooting

5.12-rc7 occasional btrfs splat when rebooting

[Chris Murphy]

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