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================================================================== BUG: KCSAN: data-race in fprop_reflect_period_percpu / fprop_reflect_period_percpu write to 0xffff8881025cd9c8 of 4 bytes by task 227 on cpu 0: fprop_reflect_period_percpu+0x17c/0x1a0 lib/flex_proportions.c:215 __fprop_inc_percpu lib/flex_proportions.c:222 [inline] __fprop_inc_percpu_max+0x3f/0x1f0 lib/flex_proportions.c:271 wb_domain_writeout_inc mm/page-writeback.c:575 [inline] __wb_writeout_inc+0x7b/0x1c0 mm/page-writeback.c:599 test_clear_page_writeback+0x3a4/0x520 mm/page-writeback.c:2745 end_page_writeback+0xd7/0x260 mm/filemap.c:1494 ext4_finish_bio+0x429/0x490 fs/ext4/page-io.c:146 ext4_release_io_end+0x98/0x200 fs/ext4/page-io.c:161 ext4_end_io_end fs/ext4/page-io.c:195 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:260 [inline] ext4_end_io_rsv_work+0x306/0x360 fs/ext4/page-io.c:274 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x635/0xb90 kernel/workqueue.c:2421 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff8881025cd9c8 of 4 bytes by interrupt on cpu 1: fprop_reflect_period_percpu+0x32/0x1a0 lib/flex_proportions.c:196 __fprop_inc_percpu lib/flex_proportions.c:222 [inline] __fprop_inc_percpu_max+0x3f/0x1f0 lib/flex_proportions.c:271 wb_domain_writeout_inc mm/page-writeback.c:575 [inline] __wb_writeout_inc+0x7b/0x1c0 mm/page-writeback.c:599 test_clear_page_writeback+0x3a4/0x520 mm/page-writeback.c:2745 end_page_writeback+0xd7/0x260 mm/filemap.c:1494 ext4_finish_bio+0x429/0x490 fs/ext4/page-io.c:146 ext4_end_bio+0x1ba/0x310 fs/ext4/page-io.c:367 bio_endio+0x285/0x350 block/bio.c:1450 req_bio_endio block/blk-core.c:263 [inline] blk_update_request+0x4e5/0xb00 block/blk-core.c:1461 scsi_end_request+0x51/0x470 drivers/scsi/scsi_lib.c:569 scsi_io_completion+0x104/0xfb0 drivers/scsi/scsi_lib.c:968 scsi_finish_command+0x263/0x2b0 drivers/scsi/scsi.c:214 scsi_softirq_done+0xdf/0x440 drivers/scsi/scsi_lib.c:1446 blk_done_softirq+0x145/0x190 block/blk-mq.c:588 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x32/0x40 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu+0xb4/0xc0 kernel/softirq.c:420 common_interrupt+0xb5/0x130 arch/x86/kernel/irq.c:239 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:619 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8462 Comm: syz-fuzzer Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2020/12/21 01:24 | upstream | 6a447b0e3151 | 04201c06 | .config | console log | report | info | ci2-upstream-kcsan-gce |