loop5: detected capacity change from 0 to 4096 ================================================================== BUG: KCSAN: data-race in __mod_timer / blk_add_timer write to 0xffff888101d3a448 of 8 bytes by task 4740 on cpu 0: __mod_timer+0x731/0xbf0 kernel/time/timer.c:1052 mod_timer+0x1b/0x20 kernel/time/timer.c:1108 blk_add_timer+0x191/0x1a0 block/blk-timeout.c:164 blk_mq_start_request+0x115/0x1b0 block/blk-mq.c:727 loop_queue_rq+0x42/0x5e0 drivers/block/loop.c:2148 __blk_mq_issue_directly+0xeb/0x490 block/blk-mq.c:1978 __blk_mq_try_issue_directly+0x1a6/0x210 block/blk-mq.c:2034 blk_mq_request_issue_directly+0x9d/0x130 block/blk-mq.c:2082 blk_mq_try_issue_list_directly+0xce/0x300 block/blk-mq.c:2100 blk_mq_sched_insert_requests+0xef/0x1f0 block/blk-mq-sched.c:506 blk_mq_flush_plug_list+0x302/0x3d0 block/blk-mq.c:1935 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1718 blk_finish_plug+0x44/0x60 block/blk-core.c:1735 read_pages+0x2e9/0x540 mm/readahead.c:150 page_cache_ra_unbounded+0x3d2/0x430 mm/readahead.c:239 do_page_cache_ra mm/readahead.c:269 [inline] force_page_cache_ra+0x256/0x290 mm/readahead.c:301 page_cache_sync_ra+0xcc/0xe0 mm/readahead.c:575 page_cache_sync_readahead include/linux/pagemap.h:883 [inline] filemap_get_pages mm/filemap.c:2545 [inline] filemap_read+0x3ad/0x1220 mm/filemap.c:2628 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779 blkdev_read_iter+0xb9/0xf0 block/fops.c:545 call_read_iter include/linux/fs.h:2157 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x66c/0x750 fs/read_write.c:485 ksys_read+0xd9/0x190 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888101d3a448 of 8 bytes by task 6499 on cpu 1: blk_add_timer+0x125/0x1a0 blk_mq_start_request+0x115/0x1b0 block/blk-mq.c:727 loop_queue_rq+0x42/0x5e0 drivers/block/loop.c:2148 __blk_mq_issue_directly+0xeb/0x490 block/blk-mq.c:1978 __blk_mq_try_issue_directly+0x1a6/0x210 block/blk-mq.c:2034 blk_mq_try_issue_directly+0xb4/0x270 block/blk-mq.c:2065 blk_mq_submit_bio+0x91d/0xec0 block/blk-mq.c:2285 __submit_bio_noacct_mq block/blk-core.c:998 [inline] submit_bio_noacct+0x6e2/0x7d0 block/blk-core.c:1031 submit_bio+0x10c/0x190 submit_bh_wbc+0x2f3/0x330 fs/buffer.c:3054 submit_bh+0x21/0x30 fs/buffer.c:3060 __ext4_read_bh fs/ext4/super.c:155 [inline] ext4_read_bh+0xf1/0x170 fs/ext4/super.c:179 ext4_read_bh_lock fs/ext4/super.c:191 [inline] __ext4_sb_bread_gfp fs/ext4/super.c:223 [inline] ext4_sb_bread_unmovable+0xf7/0x1a0 fs/ext4/super.c:240 ext4_fill_super+0x427/0x7830 fs/ext4/super.c:3941 mount_bdev+0x1e8/0x290 fs/super.c:1368 ext4_mount+0x2d/0x40 fs/ext4/super.c:6515 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498 do_new_mount fs/namespace.c:2988 [inline] path_mount+0x11ec/0x1d20 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount+0x24b/0x2f0 fs/namespace.c:3516 __x64_sys_mount+0x63/0x70 fs/namespace.c:3516 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000000ffffeb11 -> 0x00000000ffffedb7 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 6499 Comm: syz-executor.5 Not tainted 5.15.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback.