BTRFS info (device loop1): enabling ssd optimizations BTRFS info (device loop1): enabling free space tree ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.184/7870 is trying to acquire lock: ffff80008fac3ae0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:318 [inline] ffff80008fac3ae0 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:4131 [inline] ffff80008fac3ae0 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:4209 [inline] ffff80008fac3ae0 (fs_reclaim){+.+.}-{0:0}, at: __do_kmalloc_node mm/slub.c:4364 [inline] ffff80008fac3ae0 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_node_track_caller_noprof+0xcc/0x4d0 mm/slub.c:4384 but task is already holding lock: ffff0000fd941978 (&fs_info->qgroup_ioctl_lock){+.+.}-{4:4}, at: btrfs_quota_enable+0x250/0x2208 fs/btrfs/qgroup.c:1051 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #10 (&fs_info->qgroup_ioctl_lock){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 btrfs_quota_enable+0x250/0x2208 fs/btrfs/qgroup.c:1051 btrfs_ioctl_quota_ctl+0x178/0x1bc fs/btrfs/ioctl.c:3667 btrfs_ioctl+0x86c/0xc3c fs/btrfs/ioctl.c:5318 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:584 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #9 (btrfs_trans_num_extwriters){++++}-{0:0}: join_transaction+0x190/0xb5c fs/btrfs/transaction.c:321 start_transaction+0x778/0x155c fs/btrfs/transaction.c:705 btrfs_start_transaction+0x34/0x44 fs/btrfs/transaction.c:816 btrfs_rebuild_free_space_tree+0xac/0x75c fs/btrfs/free-space-tree.c:1339 btrfs_start_pre_rw_mount+0xed8/0x1728 fs/btrfs/disk-io.c:3075 open_ctree+0x2324/0x32c4 fs/btrfs/disk-io.c:3617 btrfs_fill_super fs/btrfs/super.c:977 [inline] btrfs_get_tree_super fs/btrfs/super.c:1940 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2077 [inline] btrfs_get_tree+0xd5c/0x159c fs/btrfs/super.c:2111 vfs_get_tree+0x90/0x28c fs/super.c:1815 do_new_mount+0x278/0x7f4 fs/namespace.c:3808 path_mount+0x5b4/0xde0 fs/namespace.c:4123 do_mount fs/namespace.c:4136 [inline] __do_sys_mount fs/namespace.c:4347 [inline] __se_sys_mount fs/namespace.c:4324 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4324 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #8 (btrfs_trans_num_writers){++++}-{0:0}: __lock_release kernel/locking/lockdep.c:5574 [inline] lock_release+0x198/0x39c kernel/locking/lockdep.c:5889 percpu_up_read include/linux/percpu-rwsem.h:112 [inline] __sb_end_write include/linux/fs.h:1793 [inline] sb_end_intwrite+0x3c/0x348 include/linux/fs.h:1910 __btrfs_end_transaction+0x1f4/0x5f4 fs/btrfs/transaction.c:1076 btrfs_end_transaction+0x24/0x34 fs/btrfs/transaction.c:1110 btrfs_dirty_inode+0x140/0x190 fs/btrfs/inode.c:6249 btrfs_update_time+0xa0/0xd0 fs/btrfs/inode.c:6269 inode_update_time fs/inode.c:2075 [inline] touch_atime+0x2e4/0x818 fs/inode.c:2148 file_accessed include/linux/fs.h:2663 [inline] btrfs_file_mmap_prepare+0xc4/0x130 fs/btrfs/file.c:2050 vfs_mmap_prepare include/linux/fs.h:2294 [inline] call_mmap_prepare mm/vma.c:2585 [inline] __mmap_region mm/vma.c:2653 [inline] mmap_region+0x934/0x1d20 mm/vma.c:2739 do_mmap+0x968/0xfac mm/mmap.c:558 vm_mmap_pgoff+0x2d8/0x45c mm/util.c:580 ksys_mmap_pgoff+0x394/0x5b8 mm/mmap.c:604 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #7 (&mm->mmap_lock){++++}-{4:4}: __might_fault+0xc4/0x124 mm/memory.c:6958 _copy_from_iter+0xdc/0x12c0 lib/iov_iter.c:259 copy_from_iter include/linux/uio.h:228 [inline] copy_from_iter_full include/linux/uio.h:245 [inline] skb_do_copy_data_nocache include/net/sock.h:2249 [inline] skb_copy_to_page_nocache include/net/sock.h:2275 [inline] tcp_sendmsg_locked+0x1c8c/0x4774 net/ipv4/tcp.c:1252 tcp_sendmsg+0x40/0x64 net/ipv4/tcp.c:1393 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] sock_write_iter+0x25c/0x378 net/socket.c:1179 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #6 (sk_lock-AF_INET){+.+.}-{0:0}: lock_sock_nested+0x58/0x118 net/core/sock.c:3733 lock_sock include/net/sock.h:1667 [inline] inet_shutdown+0x74/0x34c net/ipv4/af_inet.c:905 kernel_sock_shutdown+0x6c/0x80 net/socket.c:3701 nbd_mark_nsock_dead+0x2a4/0x534 drivers/block/nbd.c:318 sock_shutdown+0x154/0x248 drivers/block/nbd.c:411 nbd_start_device_ioctl drivers/block/nbd.c:1547 [inline] __nbd_ioctl drivers/block/nbd.c:1612 [inline] nbd_ioctl+0x828/0xc4c drivers/block/nbd.c:1652 blkdev_ioctl+0x610/0xac0 block/ioctl.c:705 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:584 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #5 (&nsock->tx_lock){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 nbd_handle_cmd drivers/block/nbd.c:1140 [inline] nbd_queue_rq+0x20c/0xc48 drivers/block/nbd.c:1204 blk_mq_dispatch_rq_list+0x890/0x1548 block/blk-mq.c:2120 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline] __blk_mq_sched_dispatch_requests+0xa7c/0x10e4 block/blk-mq-sched.c:307 blk_mq_sched_dispatch_requests+0xa4/0x154 block/blk-mq-sched.c:329 blk_mq_run_hw_queue+0x2d0/0x4a4 block/blk-mq.c:2358 blk_mq_dispatch_list+0xa00/0xaf8 block/blk-mq.c:-1 blk_mq_flush_plug_list+0x3a4/0x488 block/blk-mq.c:2967 __blk_flush_plug+0x330/0x408 block/blk-core.c:1220 blk_finish_plug block/blk-core.c:1247 [inline] __submit_bio+0x3f4/0x4d8 block/blk-core.c:649 __submit_bio_noacct_mq block/blk-core.c:722 [inline] submit_bio_noacct_nocheck+0x390/0xaac block/blk-core.c:751 submit_bio_noacct+0xc94/0x177c block/blk-core.c:874 submit_bio+0x3b4/0x550 block/blk-core.c:916 submit_bh_wbc+0x3ec/0x4bc fs/buffer.c:2824 submit_bh fs/buffer.c:2829 [inline] block_read_full_folio+0x4ec/0x824 fs/buffer.c:2447 blkdev_read_folio+0x28/0x38 block/fops.c:491 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2413 do_read_cache_folio+0x364/0x5bc mm/filemap.c:3957 read_cache_folio+0x68/0x88 mm/filemap.c:3989 read_mapping_folio include/linux/pagemap.h:991 [inline] read_part_sector+0xcc/0x6fc block/partitions/core.c:722 adfspart_check_ICS+0xa0/0x83c block/partitions/acorn.c:360 check_partition block/partitions/core.c:141 [inline] blk_add_partitions block/partitions/core.c:589 [inline] bdev_disk_changed+0x674/0x11fc block/partitions/core.c:693 blkdev_get_whole+0x2b0/0x4a4 block/bdev.c:748 bdev_open+0x3b0/0xc20 block/bdev.c:957 blkdev_open+0x300/0x440 block/fops.c:691 do_dentry_open+0x7a4/0x10bc fs/open.c:965 vfs_open+0x44/0x2d4 fs/open.c:1095 do_open fs/namei.c:3887 [inline] path_openat+0x2424/0x2c40 fs/namei.c:4046 do_filp_open+0x18c/0x36c fs/namei.c:4073 do_sys_openat2+0x11c/0x1b4 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1461 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #4 (&cmd->lock){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 nbd_queue_rq+0xb4/0xc48 drivers/block/nbd.c:1196 blk_mq_dispatch_rq_list+0x890/0x1548 block/blk-mq.c:2120 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline] __blk_mq_sched_dispatch_requests+0xa7c/0x10e4 block/blk-mq-sched.c:307 blk_mq_sched_dispatch_requests+0xa4/0x154 block/blk-mq-sched.c:329 blk_mq_run_hw_queue+0x2d0/0x4a4 block/blk-mq.c:2358 blk_mq_dispatch_list+0xa00/0xaf8 block/blk-mq.c:-1 blk_mq_flush_plug_list+0x3a4/0x488 block/blk-mq.c:2967 __blk_flush_plug+0x330/0x408 block/blk-core.c:1220 blk_finish_plug block/blk-core.c:1247 [inline] __submit_bio+0x3f4/0x4d8 block/blk-core.c:649 __submit_bio_noacct_mq block/blk-core.c:722 [inline] submit_bio_noacct_nocheck+0x390/0xaac block/blk-core.c:751 submit_bio_noacct+0xc94/0x177c block/blk-core.c:874 submit_bio+0x3b4/0x550 block/blk-core.c:916 submit_bh_wbc+0x3ec/0x4bc fs/buffer.c:2824 submit_bh fs/buffer.c:2829 [inline] block_read_full_folio+0x4ec/0x824 fs/buffer.c:2447 blkdev_read_folio+0x28/0x38 block/fops.c:491 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2413 do_read_cache_folio+0x364/0x5bc mm/filemap.c:3957 read_cache_folio+0x68/0x88 mm/filemap.c:3989 read_mapping_folio include/linux/pagemap.h:991 [inline] read_part_sector+0xcc/0x6fc block/partitions/core.c:722 adfspart_check_ICS+0xa0/0x83c block/partitions/acorn.c:360 check_partition block/partitions/core.c:141 [inline] blk_add_partitions block/partitions/core.c:589 [inline] bdev_disk_changed+0x674/0x11fc block/partitions/core.c:693 blkdev_get_whole+0x2b0/0x4a4 block/bdev.c:748 bdev_open+0x3b0/0xc20 block/bdev.c:957 blkdev_open+0x300/0x440 block/fops.c:691 do_dentry_open+0x7a4/0x10bc fs/open.c:965 vfs_open+0x44/0x2d4 fs/open.c:1095 do_open fs/namei.c:3887 [inline] path_openat+0x2424/0x2c40 fs/namei.c:4046 do_filp_open+0x18c/0x36c fs/namei.c:4073 do_sys_openat2+0x11c/0x1b4 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1461 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #3 (set->srcu){.+.+}-{0:0}: srcu_lock_sync+0x2c/0x38 include/linux/srcu.h:173 __synchronize_srcu+0xa0/0x348 kernel/rcu/srcutree.c:1429 synchronize_srcu+0x2cc/0x338 kernel/rcu/srcutree.c:-1 blk_mq_wait_quiesce_done block/blk-mq.c:283 [inline] blk_mq_quiesce_queue+0x118/0x16c block/blk-mq.c:303 elevator_switch+0x12c/0x410 block/elevator.c:588 elevator_change+0x264/0x3cc block/elevator.c:690 elevator_set_default+0x138/0x21c block/elevator.c:766 blk_register_queue+0x2b4/0x338 block/blk-sysfs.c:904 __add_disk+0x560/0xb90 block/genhd.c:528 add_disk_fwnode+0xdc/0x438 block/genhd.c:597 device_add_disk+0x38/0x4c block/genhd.c:627 add_disk include/linux/blkdev.h:774 [inline] nbd_dev_add+0x560/0x820 drivers/block/nbd.c:1973 nbd_init+0x15c/0x174 drivers/block/nbd.c:2680 do_one_initcall+0x250/0x990 init/main.c:1269 do_initcall_level+0x128/0x1c4 init/main.c:1331 do_initcalls+0x70/0xd0 init/main.c:1347 do_basic_setup+0x78/0x8c init/main.c:1366 kernel_init_freeable+0x268/0x39c init/main.c:1579 kernel_init+0x24/0x1dc init/main.c:1469 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 -> #2 (&q->elevator_lock){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 elevator_change+0x16c/0x3cc block/elevator.c:688 elevator_set_none+0x48/0xac block/elevator.c:781 blk_mq_elv_switch_none block/blk-mq.c:5023 [inline] __blk_mq_update_nr_hw_queues block/blk-mq.c:5066 [inline] blk_mq_update_nr_hw_queues+0x4c8/0x15f4 block/blk-mq.c:5124 nbd_start_device+0x158/0xa48 drivers/block/nbd.c:1478 nbd_genl_connect+0xf88/0x158c drivers/block/nbd.c:2228 genl_family_rcv_msg_doit+0x1d8/0x2bc net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x450/0x624 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x220/0x3fc net/netlink/af_netlink.c:2552 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x694/0x8c4 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x648/0x930 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] ____sys_sendmsg+0x490/0x7b8 net/socket.c:2614 ___sys_sendmsg+0x204/0x278 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __arm64_sys_sendmsg+0x184/0x238 net/socket.c:2703 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #1 (&q->q_usage_counter(io)#33){++++}-{0:0}: blk_alloc_queue+0x48c/0x54c block/blk-core.c:461 blk_mq_alloc_queue block/blk-mq.c:4400 [inline] __blk_mq_alloc_disk+0x124/0x304 block/blk-mq.c:4447 nbd_dev_add+0x398/0x820 drivers/block/nbd.c:1943 nbd_init+0x15c/0x174 drivers/block/nbd.c:2680 do_one_initcall+0x250/0x990 init/main.c:1269 do_initcall_level+0x128/0x1c4 init/main.c:1331 do_initcalls+0x70/0xd0 init/main.c:1347 do_basic_setup+0x78/0x8c init/main.c:1366 kernel_init_freeable+0x268/0x39c init/main.c:1579 kernel_init+0x24/0x1dc init/main.c:1469 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 __fs_reclaim_acquire mm/page_alloc.c:4234 [inline] fs_reclaim_acquire+0x8c/0x118 mm/page_alloc.c:4248 might_alloc include/linux/sched/mm.h:318 [inline] slab_pre_alloc_hook mm/slub.c:4131 [inline] slab_alloc_node mm/slub.c:4209 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_node_track_caller_noprof+0xcc/0x4d0 mm/slub.c:4384 kvasprintf+0xfc/0x1c8 lib/kasprintf.c:25 kvasprintf_const+0x148/0x2d0 lib/kasprintf.c:49 kobject_set_name_vargs+0xcc/0x1b4 lib/kobject.c:274 kobject_add_varg lib/kobject.c:368 [inline] kobject_init_and_add+0xe0/0x17c lib/kobject.c:457 btrfs_sysfs_add_one_qgroup+0xb0/0x130 fs/btrfs/sysfs.c:2595 btrfs_quota_enable+0xa9c/0x2208 fs/btrfs/qgroup.c:1192 btrfs_ioctl_quota_ctl+0x178/0x1bc fs/btrfs/ioctl.c:3667 btrfs_ioctl+0x86c/0xc3c fs/btrfs/ioctl.c:5318 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:584 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 other info that might help us debug this: Chain exists of: fs_reclaim --> btrfs_trans_num_extwriters --> &fs_info->qgroup_ioctl_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&fs_info->qgroup_ioctl_lock); lock(btrfs_trans_num_extwriters); lock(&fs_info->qgroup_ioctl_lock); lock(fs_reclaim); *** DEADLOCK *** 6 locks held by syz.1.184/7870: #0: ffff0000c3ec4428 (sb_writers#14){.+.+}-{0:0}, at: mnt_want_write_file+0x64/0x1e8 fs/namespace.c:601 #1: ffff0000fd940c40 (&fs_info->subvol_sem){+.+.}-{4:4}, at: btrfs_ioctl_quota_ctl+0x16c/0x1bc fs/btrfs/ioctl.c:3666 #2: ffff0000c3ec4618 (sb_internal#3){.+.+}-{0:0}, at: btrfs_start_transaction+0x34/0x44 fs/btrfs/transaction.c:816 #3: ffff0000fd942510 (btrfs_trans_num_writers){++++}-{0:0}, at: join_transaction+0x134/0xb5c fs/btrfs/transaction.c:317 #4: ffff0000fd942538 (btrfs_trans_num_extwriters){++++}-{0:0}, at: join_transaction+0x164/0xb5c fs/btrfs/transaction.c:320 #5: ffff0000fd941978 (&fs_info->qgroup_ioctl_lock){+.+.}-{4:4}, at: btrfs_quota_enable+0x250/0x2208 fs/btrfs/qgroup.c:1051 stack backtrace: CPU: 0 UID: 0 PID: 7870 Comm: syz.1.184 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2043 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 __fs_reclaim_acquire mm/page_alloc.c:4234 [inline] fs_reclaim_acquire+0x8c/0x118 mm/page_alloc.c:4248 might_alloc include/linux/sched/mm.h:318 [inline] slab_pre_alloc_hook mm/slub.c:4131 [inline] slab_alloc_node mm/slub.c:4209 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_node_track_caller_noprof+0xcc/0x4d0 mm/slub.c:4384 kvasprintf+0xfc/0x1c8 lib/kasprintf.c:25 kvasprintf_const+0x148/0x2d0 lib/kasprintf.c:49 kobject_set_name_vargs+0xcc/0x1b4 lib/kobject.c:274 kobject_add_varg lib/kobject.c:368 [inline] kobject_init_and_add+0xe0/0x17c lib/kobject.c:457 btrfs_sysfs_add_one_qgroup+0xb0/0x130 fs/btrfs/sysfs.c:2595 btrfs_quota_enable+0xa9c/0x2208 fs/btrfs/qgroup.c:1192 btrfs_ioctl_quota_ctl+0x178/0x1bc fs/btrfs/ioctl.c:3667 btrfs_ioctl+0x86c/0xc3c fs/btrfs/ioctl.c:5318 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:584 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596