====================================================== WARNING: possible circular locking dependency detected 6.12.0-syzkaller-03657-g43fb83c17ba2 #0 Not tainted ------------------------------------------------------ kworker/u8:4/72 is trying to acquire lock: ffff88807ee86610 (sb_internal#2){.+.+}-{0:0}, at: btrfs_finish_one_ordered+0x3a8/0x2200 fs/btrfs/inode.c:3069 but task is already holding lock: ffff88806a552588 (btrfs_ordered_extent){++++}-{0:0}, at: btrfs_finish_one_ordered+0xa1c/0x2200 fs/btrfs/inode.c:3047 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #9 (btrfs_ordered_extent){++++}-{0:0}: btrfs_start_ordered_extent+0x4e9/0x6f0 fs/btrfs/ordered-data.c:872 btrfs_page_mkwrite+0x925/0x18b0 fs/btrfs/file.c:1870 do_page_mkwrite+0x17a/0x380 mm/memory.c:3162 wp_page_shared mm/memory.c:3563 [inline] do_wp_page+0xcbf/0x49d0 mm/memory.c:3713 handle_pte_fault mm/memory.c:5782 [inline] __handle_mm_fault+0x1a93/0x2a10 mm/memory.c:5909 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6077 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #8 (sb_pagefaults#2){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1725 [inline] sb_start_pagefault include/linux/fs.h:1890 [inline] btrfs_page_mkwrite+0x2b5/0x18b0 fs/btrfs/file.c:1813 do_page_mkwrite+0x17a/0x380 mm/memory.c:3162 do_shared_fault mm/memory.c:5373 [inline] do_fault mm/memory.c:5435 [inline] do_pte_missing+0x29e/0x3e70 mm/memory.c:3965 handle_pte_fault mm/memory.c:5766 [inline] __handle_mm_fault+0x100a/0x2a10 mm/memory.c:5909 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6077 do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #7 (&mm->mmap_lock){++++}-{4:4}: __might_fault mm/memory.c:6716 [inline] __might_fault+0x11b/0x190 mm/memory.c:6709 _inline_copy_from_user include/linux/uaccess.h:162 [inline] _copy_from_user+0x29/0xd0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] __blk_trace_setup+0xa8/0x180 kernel/trace/blktrace.c:626 blk_trace_setup+0x47/0x70 kernel/trace/blktrace.c:648 sg_ioctl_common drivers/scsi/sg.c:1121 [inline] sg_ioctl+0x65e/0x2750 drivers/scsi/sg.c:1163 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #6 (&q->debugfs_mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 blk_mq_init_sched+0x42b/0x640 block/blk-mq-sched.c:473 elevator_init_mq+0x2cd/0x420 block/elevator.c:610 add_disk_fwnode+0x113/0x1300 block/genhd.c:413 sd_probe+0xa86/0x1000 drivers/scsi/sd.c:4024 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x241/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958 bus_for_each_drv+0x15a/0x1e0 drivers/base/bus.c:459 __device_attach_async_helper+0x1d3/0x290 drivers/base/dd.c:987 async_run_entry_fn+0x9f/0x530 kernel/async.c:129 process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c4/0x3a0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #5 (&q->q_usage_counter(queue)#50){++++}-{0:0}: blk_queue_enter+0x50f/0x640 block/blk-core.c:328 blk_mq_alloc_request+0x59b/0x950 block/blk-mq.c:652 scsi_alloc_request drivers/scsi/scsi_lib.c:1222 [inline] scsi_execute_cmd+0x1eb/0xf40 drivers/scsi/scsi_lib.c:304 read_capacity_16+0x213/0xe10 drivers/scsi/sd.c:2655 sd_read_capacity drivers/scsi/sd.c:2824 [inline] sd_revalidate_disk.isra.0+0x1a06/0xa8d0 drivers/scsi/sd.c:3734 sd_probe+0x904/0x1000 drivers/scsi/sd.c:4010 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x241/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958 bus_for_each_drv+0x15a/0x1e0 drivers/base/bus.c:459 __device_attach_async_helper+0x1d3/0x290 drivers/base/dd.c:987 async_run_entry_fn+0x9f/0x530 kernel/async.c:129 process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c4/0x3a0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #4 (&q->limits_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 queue_limits_start_update include/linux/blkdev.h:945 [inline] loop_reconfigure_limits+0x2da/0x8d0 drivers/block/loop.c:1003 loop_set_block_size drivers/block/loop.c:1473 [inline] lo_simple_ioctl drivers/block/loop.c:1496 [inline] lo_ioctl+0x901/0x18b0 drivers/block/loop.c:1559 blkdev_ioctl+0x279/0x6d0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (&q->q_usage_counter(io)#17){++++}-{0:0}: bio_queue_enter block/blk.h:75 [inline] blk_mq_submit_bio+0x1fc4/0x24c0 block/blk-mq.c:3092 __submit_bio+0x384/0x540 block/blk-core.c:629 __submit_bio_noacct_mq block/blk-core.c:710 [inline] submit_bio_noacct_nocheck+0x6fb/0xd70 block/blk-core.c:739 submit_bio_noacct+0x93a/0x1e10 block/blk-core.c:868 btrfs_submit_dev_bio+0x54d/0xb20 fs/btrfs/bio.c:456 btrfs_submit_bio+0x50b/0x6d0 fs/btrfs/bio.c:493 btrfs_submit_chunk fs/btrfs/bio.c:745 [inline] btrfs_submit_bbio+0x5c0/0x19c0 fs/btrfs/bio.c:773 submit_eb_page fs/btrfs/extent_io.c:1931 [inline] btree_write_cache_pages+0xb95/0x11c0 fs/btrfs/extent_io.c:1981 btree_writepages+0x187/0x1e0 fs/btrfs/disk-io.c:520 do_writepages+0x1b6/0x820 mm/page-writeback.c:2683 filemap_fdatawrite_wbc mm/filemap.c:398 [inline] filemap_fdatawrite_wbc+0x104/0x160 mm/filemap.c:388 __filemap_fdatawrite_range+0xb3/0xf0 mm/filemap.c:431 btrfs_write_marked_extents+0x116/0x2e0 fs/btrfs/transaction.c:1149 btrfs_write_and_wait_transaction+0xec/0x2a0 fs/btrfs/transaction.c:1257 btrfs_commit_transaction+0x1fcf/0x3b30 fs/btrfs/transaction.c:2519 btrfs_sync_fs+0x134/0x7b0 fs/btrfs/super.c:1040 sync_filesystem+0x1cf/0x290 fs/sync.c:66 generic_shutdown_super+0x7e/0x3d0 fs/super.c:621 kill_anon_super+0x3a/0x60 fs/super.c:1237 btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2112 deactivate_locked_super+0xc1/0x1a0 fs/super.c:473 deactivate_super+0xde/0x100 fs/super.c:506 cleanup_mnt+0x222/0x450 fs/namespace.c:1373 task_work_run+0x151/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&fs_info->tree_log_mutex){+.+.}-{4:4}: __lock_release kernel/locking/lockdep.c:5563 [inline] lock_release+0x369/0x6f0 kernel/locking/lockdep.c:5870 __mutex_unlock_slowpath+0xa3/0x690 kernel/locking/mutex.c:896 btrfs_commit_transaction+0x1f16/0x3b30 fs/btrfs/transaction.c:2509 insert_balance_item.isra.0+0x343/0x390 fs/btrfs/volumes.c:3757 btrfs_balance+0x1085/0x3ef0 fs/btrfs/volumes.c:4633 btrfs_ioctl_balance fs/btrfs/ioctl.c:3670 [inline] btrfs_ioctl+0x39c8/0x5b70 fs/btrfs/ioctl.c:5242 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (btrfs_trans_unblocked){++++}-{0:0}: wait_current_trans+0x241/0x490 fs/btrfs/transaction.c:523 start_transaction+0x41c/0x1aa0 fs/btrfs/transaction.c:694 btrfs_create_common+0x18b/0x270 fs/btrfs/inode.c:6562 btrfs_create+0x114/0x160 fs/btrfs/inode.c:6608 lookup_open.isra.0+0x1177/0x14c0 fs/namei.c:3649 open_last_lookups fs/namei.c:3748 [inline] path_openat+0x904/0x2d60 fs/namei.c:3984 do_filp_open+0x20c/0x470 fs/namei.c:4014 do_sys_openat2+0x17a/0x1e0 fs/open.c:1398 do_sys_open fs/open.c:1413 [inline] __do_sys_open fs/open.c:1421 [inline] __se_sys_open fs/open.c:1417 [inline] __x64_sys_open+0x154/0x1e0 fs/open.c:1417 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (sb_internal#2){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1725 [inline] sb_start_intwrite include/linux/fs.h:1908 [inline] start_transaction+0xbd3/0x1aa0 fs/btrfs/transaction.c:691 btrfs_finish_one_ordered+0x3a8/0x2200 fs/btrfs/inode.c:3069 btrfs_work_helper+0x228/0xc90 fs/btrfs/async-thread.c:314 process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c4/0x3a0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 other info that might help us debug this: Chain exists of: sb_internal#2 --> sb_pagefaults#2 --> btrfs_ordered_extent Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(btrfs_ordered_extent); lock(sb_pagefaults#2); lock(btrfs_ordered_extent); rlock(sb_internal#2); *** DEADLOCK *** 3 locks held by kworker/u8:4/72: #0: ffff88806bec4148 ((wq_completion)btrfs-endio-write){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc900020afd80 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffff88806a552588 (btrfs_ordered_extent){++++}-{0:0}, at: btrfs_finish_one_ordered+0xa1c/0x2200 fs/btrfs/inode.c:3047 stack backtrace: CPU: 0 UID: 0 PID: 72 Comm: kworker/u8:4 Not tainted 6.12.0-syzkaller-03657-g43fb83c17ba2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Workqueue: btrfs-endio-write btrfs_work_helper Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1725 [inline] sb_start_intwrite include/linux/fs.h:1908 [inline] start_transaction+0xbd3/0x1aa0 fs/btrfs/transaction.c:691 btrfs_finish_one_ordered+0x3a8/0x2200 fs/btrfs/inode.c:3069 btrfs_work_helper+0x228/0xc90 fs/btrfs/async-thread.c:314 process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c4/0x3a0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244