lockdep + kasan bug?
From: Kent Overstreet
Date: Mon Nov 20 2023 - 18:37:11 EST
I've been seeing a lot of reports like the following in a lot of my
lockdep + kasan tests.
Some lockdep patches are in my tree: they don't touch this code path
(except I do have to increase MAX_LOCK_DEPTH from 48 to 63, perhaps that
has unintended side effects?)
https://evilpiepirate.org/git/bcachefs.git/log/?id=2f42f415f7573001b4f4887b785d8a8747b3757f
bcachefs does take a _large_ number of locks for lockdep to track, also
possibly relevant
Have not dug into the lockdep hash table of outstanding locks code yet
but happy to test patches...
04752 ========= TEST tiering_variable_buckets_replicas
04752
04752 WATCHDOG 3600
04753 bcachefs (ea667958-8bbd-451b-9043-9132a2fd2fa4): mounting version 1.3: rebalance_work opts=metadata_replicas=2,data_replicas=2,foreground_target=ssd,background_target=hdd,promote_target=ssd,fsck
04753 bcachefs (ea667958-8bbd-451b-9043-9132a2fd2fa4): initializing new filesystem
04753 bcachefs (ea667958-8bbd-451b-9043-9132a2fd2fa4): going read-write
04753 bcachefs (ea667958-8bbd-451b-9043-9132a2fd2fa4): marking superblocks
04753 bcachefs (ea667958-8bbd-451b-9043-9132a2fd2fa4): initializing freespace
04753 bcachefs (ea667958-8bbd-451b-9043-9132a2fd2fa4): done initializing freespace
04753 bcachefs (ea667958-8bbd-451b-9043-9132a2fd2fa4): reading snapshots table
04753 bcachefs (ea667958-8bbd-451b-9043-9132a2fd2fa4): reading snapshots done
04753 WATCHDOG 3600
04753 randrw: (g=0): rw=randrw, bs=(R) 4096B-1024KiB, (W) 4096B-1024KiB, (T) 4096B-1024KiB, ioengine=libaio, iodepth=64
04753 fio-3.33
04753 Starting 1 process
04753 randrw: Laying out IO file (1 file / 3500MiB)
05117 Jobs: 1 (f=1)
05117 BUG: KASAN: global-out-of-bounds in add_chain_block+0x44/0x288
05117 Read of size 4 at addr ffffffc081b7a8bc by task fio/120528
05117
05117 CPU: 11 PID: 120528 Comm: fio Tainted: G L 6.6.0-ktest-gc18b7260ddd3 #8209
05117 Hardware name: linux,dummy-virt (DT)
05117 Call trace:
05117 dump_backtrace+0xa8/0xe8
05117 show_stack+0x1c/0x30
05117 dump_stack_lvl+0x5c/0xa0
05117 print_report+0x1e4/0x5a0
05117 kasan_report+0x80/0xc0
05117 __asan_load4+0x90/0xb0
05117 add_chain_block+0x44/0x288
05117 __lock_acquire+0x1104/0x24f8
05117 lock_acquire+0x1e0/0x470
05117 _raw_spin_lock_nested+0x54/0x78
05117 raw_spin_rq_lock_nested+0x30/0x50
05117 try_to_wake_up+0x3b4/0x1050
05117 wake_up_process+0x1c/0x30
05117 kick_pool+0x104/0x1b0
05117 __queue_work+0x350/0xa58
05117 queue_work_on+0x98/0xd0
05117 __bch2_btree_node_write+0xec0/0x10a0
05117 bch2_btree_node_write+0x88/0x138
05117 btree_split+0x744/0x14a0
05117 bch2_btree_split_leaf+0x94/0x258
05117 bch2_trans_commit_error.isra.0+0x234/0x7d0
05117 __bch2_trans_commit+0x1128/0x3010
05117 bch2_extent_update+0x410/0x570
05117 bch2_write_index_default+0x404/0x598
05117 __bch2_write_index+0xb0/0x3b0
05117 __bch2_write+0x6f0/0x928
05117 bch2_write+0x368/0x8e0
05117 bch2_direct_write+0xaa8/0x12c0
05117 bch2_write_iter+0x2e4/0x1050
05117 aio_write.constprop.0+0x19c/0x420
05117 io_submit_one.constprop.0+0xf30/0x17a0
05117 __arm64_sys_io_submit+0x244/0x388
05117 invoke_syscall.constprop.0+0x64/0x138
05117 do_el0_svc+0x7c/0x120
05117 el0_svc+0x34/0x80
05117 el0t_64_sync_handler+0xb8/0xc0
05117 el0t_64_sync+0x14c/0x150
05117
05117 The buggy address belongs to the variable:
05117 nr_large_chain_blocks+0x3c/0x40
05117
05117 The buggy address belongs to the virtual mapping at
05117 [ffffffc081710000, ffffffc088861000) created by:
05117 paging_init+0x260/0x820
05117
05117 The buggy address belongs to the physical page:
05117 page:00000000ce625900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x41d7a
05117 flags: 0x4000(reserved|zone=0)
05117 page_type: 0xffffffff()
05117 raw: 0000000000004000 fffffffe00075e88 fffffffe00075e88 0000000000000000
05117 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
05117 page dumped because: kasan: bad access detected
05117
05117 Memory state around the buggy address:
05117 ffffffc081b7a780: 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
05117 ffffffc081b7a800: 00 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
05117 >ffffffc081b7a880: 04 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
05117 ^
05117 ffffffc081b7a900: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9
05117 ffffffc081b7a980: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9
05117 ==================================================================
05117 Kernel panic - not syncing: kasan.fault=panic set ...
05117 CPU: 11 PID: 120528 Comm: fio Tainted: G L 6.6.0-ktest-gc18b7260ddd3 #8209
05117 Hardware name: linux,dummy-virt (DT)
05117 Call trace:
05117 dump_backtrace+0xa8/0xe8
05117 show_stack+0x1c/0x30
05117 dump_stack_lvl+0x5c/0xa0
05117 dump_stack+0x18/0x20
05117 panic+0x3ac/0x408
05117 kasan_report_invalid_free+0x0/0x90
05117 kasan_report+0x90/0xc0
05117 __asan_load4+0x90/0xb0
05117 add_chain_block+0x44/0x288
05117 __lock_acquire+0x1104/0x24f8
05117 lock_acquire+0x1e0/0x470
05117 _raw_spin_lock_nested+0x54/0x78
05117 raw_spin_rq_lock_nested+0x30/0x50
05117 try_to_wake_up+0x3b4/0x1050
05117 wake_up_process+0x1c/0x30
05117 kick_pool+0x104/0x1b0
05117 __queue_work+0x350/0xa58
05117 queue_work_on+0x98/0xd0
05117 __bch2_btree_node_write+0xec0/0x10a0
05117 bch2_btree_node_write+0x88/0x138
05117 btree_split+0x744/0x14a0
05117 bch2_btree_split_leaf+0x94/0x258
05117 bch2_trans_commit_error.isra.0+0x234/0x7d0
05117 __bch2_trans_commit+0x1128/0x3010
05117 bch2_extent_update+0x410/0x570
05117 bch2_write_index_default+0x404/0x598
05117 __bch2_write_index+0xb0/0x3b0
05117 __bch2_write+0x6f0/0x928
05117 bch2_write+0x368/0x8e0
05117 bch2_direct_write+0xaa8/0x12c0
05117 bch2_write_iter+0x2e4/0x1050
05117 aio_write.constprop.0+0x19c/0x420
05117 io_submit_one.constprop.0+0xf30/0x17a0
05117 __arm64_sys_io_submit+0x244/0x388
05117 invoke_syscall.constprop.0+0x64/0x138
05117 do_el0_svc+0x7c/0x120
05117 el0_svc+0x34/0x80
05117 el0t_64_sync_handler+0xb8/0xc0
05117 el0t_64_sync+0x14c/0x150
05117 SMP: stopping secondary CPUs
05117 Kernel Offset: disabled
05117 CPU features: 0x0,00000000,70000001,1040500b
05117 Memory Limit: none
05117 ---[ end Kernel panic - not syncing: kasan.fault=panic set ... ]---
05122 ========= FAILED TIMEOUT tiering_variable_buckets_replicas in 3600s