Hello,
We've hit the call trace below during our tests of kernel with
(commit: c7d102232649 - Merge tag 'net-5.14-rc4') on ppc64le. We only
hit this once so far and unfortunately we don't have any reliable
reproducer. More logs on [1].
[16978.535174] BUG: MAX_LOCKDEP_ENTRIES too low!
[16978.535201] turning off the locking correctness validator.
[16978.535224] CPU: 76 PID: 887944 Comm: ext4lazyinit Tainted: G
OE 5.14.0-rc3 #1
[16978.535253] Call Trace:
[16978.535271] [c0000004684fb430] [c000000000978154]
dump_stack_lvl+0x98/0xe0 (unreliable)
[16978.535307] [c0000004684fb470] [c000000000205f48]
add_lock_to_list.constprop.0+0x208/0x220
[16978.535348] [c0000004684fb4e0] [c00000000020cb40]
__lock_acquire+0x1e70/0x2710
[16978.535386] [c0000004684fb610] [c00000000020df4c] lock_acquire+0x11c/0x450
[16978.535423] [c0000004684fb710] [c00000000119193c]
_raw_spin_lock_irqsave+0x6c/0xc0
[16978.535462] [c0000004684fb750] [c008000019a80038]
dm_deferred_entry_inc+0x30/0x80 [dm_bio_prison]
[16978.535506] [c0000004684fb780] [c008000018b48558]
thin_map+0x3a0/0x410 [dm_thin_pool]
[16978.535538] [c0000004684fb820] [c000000000d1c228] __map_bio.isra.0+0xa8/0x400
[16978.535576] [c0000004684fb8b0] [c000000000d1cca4]
__split_and_process_non_flush+0x264/0x380
[16978.535614] [c0000004684fb960] [c000000000d1cf40] dm_submit_bio+0x180/0x620
[16978.535650] [c0000004684fba30] [c00000000088da6c]
submit_bio_noacct+0x12c/0x5a0
[16978.535680] [c0000004684fbad0] [c0000000008818e4] submit_bio_wait+0x74/0xb0
[16978.535715] [c0000004684fbb60] [c000000000899c68]
blkdev_issue_zeroout+0xd8/0x310
[16978.535754] [c0000004684fbc00] [c0000000006dcde0]
ext4_init_inode_table+0x260/0x4d0
[16978.535793] [c0000004684fbce0] [c00000000073ff2c]
ext4_lazyinit_thread+0x85c/0xae0
[16978.535832] [c0000004684fbda0] [c000000000198cd0] kthread+0x1a0/0x1b0
[16978.535868] [c0000004684fbe10] [c00000000000cfd4]
ret_from_kernel_thread+0x5c/0x64
[1] https://arr-cki-prod-datawarehouse-public.s3.amazonaws.com/index.html?prefix=datawarehouse-public/2021/07/30/345792757/build_ppc64le_redhat%3A1466822690/tests/lvm_snapper_test/
Thank you,
Bruno
