====================================================== WARNING: possible circular locking dependency detected 6.13.0-rc3-syzkaller-g573067a5a685 #0 Not tainted ------------------------------------------------------ syz.2.304/7942 is trying to acquire lock: ffff0000cc42def0 (&lp->qli_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff0000cc42def0 (&lp->qli_lock){+.+.}-{3:3}, at: xfs_dquot_detach_buf+0x38/0x168 fs/xfs/xfs_dquot.c:83 but task is already holding lock: ffff0000ef6d9030 (&l->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff0000ef6d9030 (&l->lock){+.+.}-{3:3}, at: lock_list_lru_of_memcg+0x200/0x458 mm/list_lru.c:77 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&l->lock){+.+.}-{3:3}: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] lock_list_lru_of_memcg+0x200/0x458 mm/list_lru.c:77 list_lru_del+0x6c/0x1f4 mm/list_lru.c:203 list_lru_del_obj+0x114/0x288 mm/list_lru.c:227 xfs_buf_stale+0x1ac/0x300 fs/xfs/xfs_buf.c:178 xfs_buf_read_map+0x600/0x9ec fs/xfs/xfs_buf.c:915 xfs_trans_read_buf_map+0x20c/0xae8 fs/xfs/xfs_trans_buf.c:304 xfs_trans_read_buf fs/xfs/xfs_trans.h:213 [inline] xfs_btree_read_buf_block+0x274/0x434 fs/xfs/libxfs/xfs_btree.c:1396 xfs_btree_lookup_get_block+0x2a8/0x500 fs/xfs/libxfs/xfs_btree.c:1897 xfs_btree_lookup+0x438/0x12d4 fs/xfs/libxfs/xfs_btree.c:2008 xfs_alloc_lookup fs/xfs/libxfs/xfs_alloc.c:168 [inline] xfs_alloc_lookup_ge fs/xfs/libxfs/xfs_alloc.c:200 [inline] xfs_alloc_cur_setup fs/xfs/libxfs/xfs_alloc.c:968 [inline] xfs_alloc_ag_vextent_near+0x42c/0x16c4 fs/xfs/libxfs/xfs_alloc.c:1707 xfs_alloc_vextent_iterate_ags+0x65c/0xa5c fs/xfs/libxfs/xfs_alloc.c:3741 xfs_alloc_vextent_start_ag+0x358/0x8ac fs/xfs/libxfs/xfs_alloc.c:3816 xfs_bmap_btalloc_best_length fs/xfs/libxfs/xfs_bmap.c:3766 [inline] xfs_bmap_btalloc fs/xfs/libxfs/xfs_bmap.c:3811 [inline] xfs_bmapi_allocate+0x1398/0x2a84 fs/xfs/libxfs/xfs_bmap.c:4224 xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4732 [inline] xfs_bmapi_convert_delalloc+0x7c8/0x1528 fs/xfs/libxfs/xfs_bmap.c:4787 xfs_map_blocks+0x5c4/0xefc fs/xfs/xfs_aops.c:363 iomap_writepage_map_blocks fs/iomap/buffered-io.c:1811 [inline] iomap_writepage_map fs/iomap/buffered-io.c:1959 [inline] iomap_writepages+0xfb0/0x2e34 fs/iomap/buffered-io.c:2013 xfs_vm_writepages+0x100/0x150 fs/xfs/xfs_aops.c:477 do_writepages+0x304/0x7d0 mm/page-writeback.c:2702 filemap_fdatawrite_wbc mm/filemap.c:397 [inline] __filemap_fdatawrite_range mm/filemap.c:430 [inline] file_write_and_wait_range+0x21c/0x330 mm/filemap.c:787 xfs_file_fsync+0x1b4/0x99c fs/xfs/xfs_file.c:138 vfs_fsync_range+0x160/0x19c fs/sync.c:187 generic_write_sync include/linux/fs.h:2904 [inline] xfs_file_buffered_write+0x938/0xa78 fs/xfs/xfs_file.c:829 xfs_file_write_iter+0x2c4/0x6ac fs/xfs/xfs_file.c:881 do_iter_readv_writev+0x490/0x6d4 vfs_writev+0x410/0xbc8 fs/read_write.c:1050 do_pwritev fs/read_write.c:1146 [inline] __do_sys_pwritev2 fs/read_write.c:1204 [inline] __se_sys_pwritev2 fs/read_write.c:1195 [inline] __arm64_sys_pwritev2+0x1d8/0x2ec fs/read_write.c:1195 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #1 (&bp->b_lock){+.+.}-{3:3}: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] xfs_buf_rele_cached fs/xfs/xfs_buf.c:1084 [inline] xfs_buf_rele+0xe0/0x1248 fs/xfs/xfs_buf.c:1151 xfs_trans_brelse+0xf0/0x460 xfs_dquot_attach_buf+0x2a8/0x44c fs/xfs/xfs_dquot.c:1345 xfs_qm_quotacheck_dqadjust+0x118/0x628 fs/xfs/xfs_qm.c:1341 xfs_qm_dqusage_adjust+0x550/0x764 fs/xfs/xfs_qm.c:1457 xfs_iwalk_ag_recs+0x43c/0x828 fs/xfs/xfs_iwalk.c:209 xfs_iwalk_run_callbacks+0x1c0/0x3f4 fs/xfs/xfs_iwalk.c:370 xfs_iwalk_ag+0x8cc/0x9c0 fs/xfs/xfs_iwalk.c:476 xfs_iwalk_ag_work+0x10c/0x1a8 fs/xfs/xfs_iwalk.c:625 xfs_pwork_work+0x80/0x1a4 fs/xfs/xfs_pwork.c:47 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #0 (&lp->qli_lock){+.+.}-{3:3}: 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+0x34f0/0x7904 kernel/locking/lockdep.c:5226 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] xfs_dquot_detach_buf+0x38/0x168 fs/xfs/xfs_dquot.c:83 xfs_qm_dquot_isolate+0x458/0x1620 fs/xfs/xfs_qm.c:528 __list_lru_walk_one+0x144/0x450 mm/list_lru.c:301 list_lru_walk_one+0x54/0x6c mm/list_lru.c:338 list_lru_shrink_walk include/linux/list_lru.h:240 [inline] xfs_qm_shrink_scan+0x18c/0x378 fs/xfs/xfs_qm.c:574 do_shrink_slab+0x62c/0x124c mm/shrinker.c:437 shrink_slab+0xe9c/0x124c mm/shrinker.c:664 drop_slab_node mm/vmscan.c:414 [inline] drop_slab+0x124/0x26c mm/vmscan.c:432 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68 proc_sys_call_handler+0x64c/0x918 fs/proc/proc_sysctl.c:601 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:627 do_iter_readv_writev+0x490/0x6d4 vfs_writev+0x410/0xbc8 fs/read_write.c:1050 do_writev+0x178/0x304 fs/read_write.c:1096 __do_sys_writev fs/read_write.c:1164 [inline] __se_sys_writev fs/read_write.c:1161 [inline] __arm64_sys_writev+0x80/0x94 fs/read_write.c:1161 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 other info that might help us debug this: Chain exists of: &lp->qli_lock --> &bp->b_lock --> &l->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&l->lock); lock(&bp->b_lock); lock(&l->lock); lock(&lp->qli_lock); *** DEADLOCK *** 4 locks held by syz.2.304/7942: #0: ffff0000ce31beb8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x220/0x2ac fs/file.c:1191 #1: ffff0000dbe34420 (sb_writers#4){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline] #1: ffff0000dbe34420 (sb_writers#4){.+.+}-{0:0}, at: vfs_writev+0x3a8/0xbc8 fs/read_write.c:1048 #2: ffff0000ef6d9030 (&l->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] #2: ffff0000ef6d9030 (&l->lock){+.+.}-{3:3}, at: lock_list_lru_of_memcg+0x200/0x458 mm/list_lru.c:77 #3: ffff0000cc42dfd8 (&xfs_dquot_project_class){+.+.}-{4:4}, at: xfs_dqlock_nowait fs/xfs/xfs_dquot.h:126 [inline] #3: ffff0000cc42dfd8 (&xfs_dquot_project_class){+.+.}-{4:4}, at: xfs_qm_dquot_isolate+0x90/0x1620 fs/xfs/xfs_qm.c:467 stack backtrace: CPU: 0 UID: 0 PID: 7942 Comm: syz.2.304 Not tainted 6.13.0-rc3-syzkaller-g573067a5a685 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x154/0x1c0 kernel/locking/lockdep.c:2074 check_noncircular+0x310/0x404 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+0x34f0/0x7904 kernel/locking/lockdep.c:5226 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] xfs_dquot_detach_buf+0x38/0x168 fs/xfs/xfs_dquot.c:83 xfs_qm_dquot_isolate+0x458/0x1620 fs/xfs/xfs_qm.c:528 __list_lru_walk_one+0x144/0x450 mm/list_lru.c:301 list_lru_walk_one+0x54/0x6c mm/list_lru.c:338 list_lru_shrink_walk include/linux/list_lru.h:240 [inline] xfs_qm_shrink_scan+0x18c/0x378 fs/xfs/xfs_qm.c:574 do_shrink_slab+0x62c/0x124c mm/shrinker.c:437 shrink_slab+0xe9c/0x124c mm/shrinker.c:664 drop_slab_node mm/vmscan.c:414 [inline] drop_slab+0x124/0x26c mm/vmscan.c:432 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68 proc_sys_call_handler+0x64c/0x918 fs/proc/proc_sysctl.c:601 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:627 do_iter_readv_writev+0x490/0x6d4 vfs_writev+0x410/0xbc8 fs/read_write.c:1050 do_writev+0x178/0x304 fs/read_write.c:1096 __do_sys_writev fs/read_write.c:1164 [inline] __se_sys_writev fs/read_write.c:1161 [inline] __arm64_sys_writev+0x80/0x94 fs/read_write.c:1161 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 syz.2.304 (7942): drop_caches: 2