====================================================== WARNING: possible circular locking dependency detected 6.13.0-rc1-syzkaller-00025-gfeffde684ac2 #0 Not tainted ------------------------------------------------------ kworker/u8:11/15834 is trying to acquire lock: ffff888067216470 (btrfs_trans_num_writers){++++}-{0:0}, at: join_transaction+0x430/0x1010 fs/btrfs/transaction.c:288 but task is already holding lock: ffff88801271a610 (sb_internal#4){.+.+}-{0:0}, at: btrfs_finish_one_ordered+0x3c9/0x2200 fs/btrfs/inode.c:3082 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #8 (sb_internal#4){.+.+}-{0:0}: 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_dirty_inode+0xc8/0x200 fs/btrfs/inode.c:6055 btrfs_update_time fs/btrfs/inode.c:6089 [inline] btrfs_update_time+0xb2/0xf0 fs/btrfs/inode.c:6080 inode_update_time fs/inode.c:2124 [inline] touch_atime+0x352/0x5d0 fs/inode.c:2197 file_accessed include/linux/fs.h:2539 [inline] btrfs_file_mmap+0x118/0x150 fs/btrfs/file.c:1953 call_mmap include/linux/fs.h:2183 [inline] mmap_file mm/internal.h:124 [inline] __mmap_new_file_vma mm/vma.c:2291 [inline] __mmap_new_vma mm/vma.c:2355 [inline] __mmap_region+0x1789/0x2670 mm/vma.c:2456 mmap_region+0x270/0x320 mm/mmap.c:1347 do_mmap+0xc00/0xfc0 mm/mmap.c:496 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:580 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:542 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 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 -> #7 (&mm->mmap_lock){++++}-{4:4}: __might_fault mm/memory.c:6751 [inline] __might_fault+0x11b/0x190 mm/memory.c:6744 _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_ioctl+0x163/0x290 kernel/trace/blktrace.c:740 blkdev_ioctl+0x109/0x6d0 block/ioctl.c:682 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:651 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:949 [inline] loop_reconfigure_limits+0x407/0x8c0 drivers/block/loop.c:998 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)#23){++++}-{0:0}: bio_queue_enter block/blk.h:75 [inline] blk_mq_submit_bio+0x1fb6/0x24c0 block/blk-mq.c:3091 __submit_bio+0x384/0x540 block/blk-core.c:629 __submit_bio_noacct_mq block/blk-core.c:710 [inline] submit_bio_noacct_nocheck+0x698/0xd70 block/blk-core.c:739 submit_bio_noacct+0x93a/0x1e20 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 read_extent_buffer_pages+0x5d0/0x8f0 fs/btrfs/extent_io.c:3558 btrfs_read_extent_buffer+0xd8/0x740 fs/btrfs/disk-io.c:229 read_block_for_search+0x5fc/0xb60 fs/btrfs/ctree.c:1619 btrfs_search_slot+0x95f/0x32a0 fs/btrfs/ctree.c:2240 btrfs_init_root_free_objectid+0xf4/0x2a0 fs/btrfs/disk-io.c:4837 btrfs_init_fs_root fs/btrfs/disk-io.c:1137 [inline] btrfs_get_root_ref+0x646/0xcc0 fs/btrfs/disk-io.c:1364 btrfs_get_fs_root fs/btrfs/disk-io.c:1416 [inline] open_ctree+0x394d/0x5320 fs/btrfs/disk-io.c:3532 btrfs_fill_super fs/btrfs/super.c:972 [inline] btrfs_get_tree_super fs/btrfs/super.c:1894 [inline] btrfs_get_tree+0x11e7/0x1b20 fs/btrfs/super.c:2105 vfs_get_tree+0x92/0x380 fs/super.c:1814 fc_mount+0x16/0xc0 fs/namespace.c:1231 btrfs_get_tree_subvol fs/btrfs/super.c:2068 [inline] btrfs_get_tree+0xa53/0x1b20 fs/btrfs/super.c:2106 vfs_get_tree+0x92/0x380 fs/super.c:1814 do_new_mount fs/namespace.c:3507 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount fs/namespace.c:4034 [inline] __x64_sys_mount+0x294/0x320 fs/namespace.c:4034 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 -> #2 (btrfs-tree-00){++++}-{4:4}: down_read_nested+0x9e/0x330 kernel/locking/rwsem.c:1649 btrfs_tree_read_lock_nested+0x2f/0x250 fs/btrfs/locking.c:146 btrfs_tree_read_lock fs/btrfs/locking.h:188 [inline] btrfs_read_lock_root_node+0x6d/0xa0 fs/btrfs/locking.c:267 btrfs_search_slot_get_root fs/btrfs/ctree.c:1790 [inline] btrfs_search_slot+0x3ba/0x32a0 fs/btrfs/ctree.c:2116 btrfs_del_orphan_item+0xbb/0x180 fs/btrfs/orphan.c:41 btrfs_orphan_del fs/btrfs/inode.c:3472 [inline] btrfs_evict_inode+0xcd4/0xe90 fs/btrfs/inode.c:5372 evict+0x40c/0x960 fs/inode.c:796 iput_final fs/inode.c:1946 [inline] iput fs/inode.c:1972 [inline] iput+0x52a/0x890 fs/inode.c:1958 do_unlinkat+0x5c3/0x760 fs/namei.c:4594 __do_sys_unlink fs/namei.c:4635 [inline] __se_sys_unlink fs/namei.c:4633 [inline] __x64_sys_unlink+0xc5/0x110 fs/namei.c:4633 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_num_extwriters){++++}-{0:0}: join_transaction+0x164/0x1010 fs/btrfs/transaction.c:313 start_transaction+0x42c/0x1aa0 fs/btrfs/transaction.c:697 btrfs_dirty_inode+0xc8/0x200 fs/btrfs/inode.c:6055 btrfs_update_time fs/btrfs/inode.c:6089 [inline] btrfs_update_time+0xb2/0xf0 fs/btrfs/inode.c:6080 inode_update_time fs/inode.c:2124 [inline] touch_atime+0x352/0x5d0 fs/inode.c:2197 file_accessed include/linux/fs.h:2539 [inline] filemap_read+0xb91/0xd70 mm/filemap.c:2714 btrfs_file_read_iter+0x17b/0x1c0 fs/btrfs/file.c:3676 __kernel_read+0x3f4/0xb50 fs/read_write.c:523 integrity_kernel_read+0x7f/0xb0 security/integrity/iint.c:28 ima_calc_file_hash_tfm+0x2c9/0x3e0 security/integrity/ima/ima_crypto.c:480 ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0x1ba/0x490 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x89f/0xa40 security/integrity/ima/ima_api.c:293 process_measurement+0x1271/0x2370 security/integrity/ima/ima_main.c:372 ima_file_check+0xc6/0x110 security/integrity/ima/ima_main.c:572 security_file_post_open+0x8e/0x210 security/security.c:3121 do_open fs/namei.c:3830 [inline] path_openat+0x1419/0x2d60 fs/namei.c:3987 do_filp_open+0x20c/0x470 fs/namei.c:4014 do_sys_openat2+0x17a/0x1e0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1428 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 (btrfs_trans_num_writers){++++}-{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 join_transaction+0x436/0x1010 fs/btrfs/transaction.c:288 start_transaction+0x42c/0x1aa0 fs/btrfs/transaction.c:697 btrfs_finish_one_ordered+0x3c9/0x2200 fs/btrfs/inode.c:3082 btrfs_work_helper+0x225/0xc80 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: btrfs_trans_num_writers --> &mm->mmap_lock --> sb_internal#4 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_internal#4); lock(&mm->mmap_lock); lock(sb_internal#4); rlock(btrfs_trans_num_writers); *** DEADLOCK *** 4 locks held by kworker/u8:11/15834: #0: ffff88802768c148 ((wq_completion)btrfs-endio-write){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204 #1: ffffc90002f97d80 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffff888067216588 (btrfs_ordered_extent){++++}-{0:0}, at: btrfs_finish_one_ordered+0x8a0/0x2200 fs/btrfs/inode.c:3047 #3: ffff88801271a610 (sb_internal#4){.+.+}-{0:0}, at: btrfs_finish_one_ordered+0x3c9/0x2200 fs/btrfs/inode.c:3082 stack backtrace: CPU: 0 UID: 0 PID: 15834 Comm: kworker/u8:11 Not tainted 6.13.0-rc1-syzkaller-00025-gfeffde684ac2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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 join_transaction+0x436/0x1010 fs/btrfs/transaction.c:288 start_transaction+0x42c/0x1aa0 fs/btrfs/transaction.c:697 btrfs_finish_one_ordered+0x3c9/0x2200 fs/btrfs/inode.c:3082 btrfs_work_helper+0x225/0xc80 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