================================================================== BUG: KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init write to 0xffff888102688550 of 8 bytes by task 20192 on cpu 1: blk_mq_rq_ctx_init+0x3dc/0x4e0 block/blk-mq.c:344 __blk_mq_alloc_request+0x270/0x290 block/blk-mq.c:399 blk_mq_submit_bio+0x27f/0xec0 block/blk-mq.c:2199 __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 fs/buffer.c:3060 [inline] __sync_dirty_buffer+0x136/0x1e0 fs/buffer.c:3155 sync_dirty_buffer+0x16/0x20 fs/buffer.c:3168 __ext4_handle_dirty_metadata+0x1c9/0x5a0 fs/ext4/ext4_jbd2.c:380 __ext4_ext_dirty fs/ext4/extents.c:166 [inline] ext4_swap_extents+0x115a/0x13f0 fs/ext4/extents.c:5710 move_extent_per_page fs/ext4/move_extent.c:360 [inline] ext4_move_extents+0x18db/0x22a0 fs/ext4/move_extent.c:673 __ext4_ioctl fs/ext4/ioctl.c:988 [inline] ext4_ioctl+0x154c/0x2190 fs/ext4/ioctl.c:1279 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 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 0xffff888102688550 of 8 bytes by task 20181 on cpu 0: blk_mq_rq_ctx_init+0x3ca/0x4e0 block/blk-mq.c:344 __blk_mq_alloc_request+0x270/0x290 block/blk-mq.c:399 blk_mq_submit_bio+0x27f/0xec0 block/blk-mq.c:2199 __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 fs/buffer.c:3060 [inline] __sync_dirty_buffer+0x136/0x1e0 fs/buffer.c:3155 sync_dirty_buffer+0x16/0x20 fs/buffer.c:3168 __ext4_handle_dirty_metadata+0x1c9/0x5a0 fs/ext4/ext4_jbd2.c:380 __ext4_ext_dirty fs/ext4/extents.c:166 [inline] ext4_swap_extents+0x115a/0x13f0 fs/ext4/extents.c:5710 move_extent_per_page fs/ext4/move_extent.c:360 [inline] ext4_move_extents+0x18db/0x22a0 fs/ext4/move_extent.c:673 __ext4_ioctl fs/ext4/ioctl.c:988 [inline] ext4_ioctl+0x154c/0x2190 fs/ext4/ioctl.c:1279 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 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: 0x000000000000a129 -> 0x000000000000a12a Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 20181 Comm: syz-executor.0 Not tainted 5.15.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================