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Date: Tue, 19 Sep 2023 08:24:02 +0200
From: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
To: Matthew Wilcox <willy@...radead.org>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: BUG: KCSAN: data-race in xas_clear_mark / xas_find_marked
Hi,
The usual setup: vanilla torvalds tree kernel 6.6-rc2, Ubuntu 22.04 LTS.
KCSAN had found a number of data-races in the btrfs implementation.
It is not clear whether this can lead to the corruption of data on the storage media.
Please find the complete KCSAN dmesg report attached.
Best regards,
Mirsad Todorovac
2149.512903] ==================================================================
[ 2149.512933] BUG: KCSAN: data-race in xas_clear_mark / xas_find_marked
[ 2149.512967] write to 0xffff8881ab9d2468 of 8 bytes by interrupt on cpu 27:
[ 2149.512984] xas_clear_mark (/home/marvin/linux/kernel/torvalds2/./arch/x86/include/asm/bitops.h:178 /home/marvin/linux/kernel/torvalds2/./include/asm-generic/bitops/instrumented-non-atomic.h:115 /home/marvin/linux/kernel/torvalds2/lib/xarray.c:102 /home/marvin/linux/kernel/torvalds2/lib/xarray.c:914)
[ 2149.513002] __xa_clear_mark (/home/marvin/linux/kernel/torvalds2/lib/xarray.c:1929)
[ 2149.513019] __folio_end_writeback (/home/marvin/linux/kernel/torvalds2/mm/page-writeback.c:2960)
[ 2149.513039] folio_end_writeback (/home/marvin/linux/kernel/torvalds2/mm/filemap.c:1613)
[ 2149.513053] end_page_writeback (/home/marvin/linux/kernel/torvalds2/mm/folio-compat.c:28)
[ 2149.513073] btrfs_page_clear_writeback (/home/marvin/linux/kernel/torvalds2/fs/btrfs/subpage.c:646) btrfs
[ 2149.513829] end_bio_extent_writepage (/home/marvin/linux/kernel/torvalds2/./include/linux/bio.h:84 /home/marvin/linux/kernel/torvalds2/fs/btrfs/extent_io.c:468) btrfs
[ 2149.514481] __btrfs_bio_end_io (/home/marvin/linux/kernel/torvalds2/fs/btrfs/bio.c:117 /home/marvin/linux/kernel/torvalds2/fs/btrfs/bio.c:112) btrfs
[ 2149.515130] btrfs_orig_bbio_end_io (/home/marvin/linux/kernel/torvalds2/fs/btrfs/bio.c:164) btrfs
[ 2149.515777] btrfs_simple_end_io (/home/marvin/linux/kernel/torvalds2/fs/btrfs/bio.c:380) btrfs
[ 2149.516425] bio_endio (/home/marvin/linux/kernel/torvalds2/block/bio.c:1603)
[ 2149.516436] blk_mq_end_request_batch (/home/marvin/linux/kernel/torvalds2/block/blk-mq.c:851 /home/marvin/linux/kernel/torvalds2/block/blk-mq.c:1089)
[ 2149.516449] nvme_pci_complete_batch (/home/marvin/linux/kernel/torvalds2/drivers/nvme/host/pci.c:986) nvme
[ 2149.516494] nvme_irq (/home/marvin/linux/kernel/torvalds2/drivers/nvme/host/pci.c:1086) nvme
[ 2149.516538] __handle_irq_event_percpu (/home/marvin/linux/kernel/torvalds2/kernel/irq/handle.c:158)
[ 2149.516553] handle_irq_event (/home/marvin/linux/kernel/torvalds2/kernel/irq/handle.c:195 /home/marvin/linux/kernel/torvalds2/kernel/irq/handle.c:210)
[ 2149.516566] handle_edge_irq (/home/marvin/linux/kernel/torvalds2/kernel/irq/chip.c:833)
[ 2149.516578] __common_interrupt (/home/marvin/linux/kernel/torvalds2/./include/linux/irqdesc.h:161 /home/marvin/linux/kernel/torvalds2/arch/x86/kernel/irq.c:238 /home/marvin/linux/kernel/torvalds2/arch/x86/kernel/irq.c:257)
[ 2149.516589] common_interrupt (/home/marvin/linux/kernel/torvalds2/arch/x86/kernel/irq.c:247 (discriminator 14))
[ 2149.516601] asm_common_interrupt (/home/marvin/linux/kernel/torvalds2/./arch/x86/include/asm/idtentry.h:636)
[ 2149.516612] cpuidle_enter_state (/home/marvin/linux/kernel/torvalds2/drivers/cpuidle/cpuidle.c:291)
[ 2149.516623] cpuidle_enter (/home/marvin/linux/kernel/torvalds2/drivers/cpuidle/cpuidle.c:390)
[ 2149.516633] call_cpuidle (/home/marvin/linux/kernel/torvalds2/kernel/sched/idle.c:135)
[ 2149.516646] do_idle (/home/marvin/linux/kernel/torvalds2/kernel/sched/idle.c:219 /home/marvin/linux/kernel/torvalds2/kernel/sched/idle.c:282)
[ 2149.516655] cpu_startup_entry (/home/marvin/linux/kernel/torvalds2/kernel/sched/idle.c:378 (discriminator 1))
[ 2149.516664] start_secondary (/home/marvin/linux/kernel/torvalds2/arch/x86/kernel/smpboot.c:210 /home/marvin/linux/kernel/torvalds2/arch/x86/kernel/smpboot.c:294)
[ 2149.516677] secondary_startup_64_no_verify (/home/marvin/linux/kernel/torvalds2/arch/x86/kernel/head_64.S:433)
[ 2149.516697] read to 0xffff8881ab9d2468 of 8 bytes by task 4603 on cpu 25:
[ 2149.516708] xas_find_marked (/home/marvin/linux/kernel/torvalds2/./include/linux/find.h:63 /home/marvin/linux/kernel/torvalds2/./include/linux/xarray.h:1722 /home/marvin/linux/kernel/torvalds2/lib/xarray.c:1354)
[ 2149.516719] filemap_get_folios_tag (/home/marvin/linux/kernel/torvalds2/mm/filemap.c:1978 /home/marvin/linux/kernel/torvalds2/mm/filemap.c:2266)
[ 2149.516729] __filemap_fdatawait_range (/home/marvin/linux/kernel/torvalds2/mm/filemap.c:516)
[ 2149.516739] filemap_fdatawait_range (/home/marvin/linux/kernel/torvalds2/mm/filemap.c:553)
[ 2149.516749] btrfs_wait_ordered_range (/home/marvin/linux/kernel/torvalds2/fs/btrfs/ordered-data.c:841) btrfs
[ 2149.517405] btrfs_sync_file (/home/marvin/linux/kernel/torvalds2/fs/btrfs/file.c:1844) btrfs
[ 2149.518059] vfs_fsync_range (/home/marvin/linux/kernel/torvalds2/fs/sync.c:188)
[ 2149.518071] __x64_sys_fsync (/home/marvin/linux/kernel/torvalds2/./include/linux/file.h:45 /home/marvin/linux/kernel/torvalds2/fs/sync.c:213 /home/marvin/linux/kernel/torvalds2/fs/sync.c:220 /home/marvin/linux/kernel/torvalds2/fs/sync.c:218 /home/marvin/linux/kernel/torvalds2/fs/sync.c:218)
[ 2149.518081] do_syscall_64 (/home/marvin/linux/kernel/torvalds2/arch/x86/entry/common.c:50 /home/marvin/linux/kernel/torvalds2/arch/x86/entry/common.c:80)
[ 2149.518095] entry_SYSCALL_64_after_hwframe (/home/marvin/linux/kernel/torvalds2/arch/x86/entry/entry_64.S:120)
[ 2149.518111] value changed: 0xffffff8000000000 -> 0x0000000000000000
[ 2149.518126] Reported by Kernel Concurrency Sanitizer on:
[ 2149.518133] CPU: 25 PID: 4603 Comm: mozStorage #1 Tainted: G L 6.6.0-rc2-kcsan-00003-g16819584c239-dirty #21
[ 2149.518146] Hardware name: ASRock X670E PG Lightning/X670E PG Lightning, BIOS 1.21 04/26/2023
[ 2149.518153] ==================================================================
Download attachment "xas_clear_mark.log.xz" of type "application/x-xz" (4836 bytes)
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