XFS (loop2): Unmounting Filesystem ca7e2101-b8f1-4838-8e2d-7637b90620e6 ====================================================== WARNING: possible circular locking dependency detected 6.9.0-rc6-syzkaller-00005-gb947cc5bf6d7 #0 Not tainted ------------------------------------------------------ syz-executor.2/6646 is trying to acquire lock: ffffffff8d937200 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:312 [inline] ffffffff8d937200 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3746 [inline] ffffffff8d937200 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3827 [inline] ffffffff8d937200 (fs_reclaim){+.+.}-{0:0}, at: kmalloc_trace+0x51/0x330 mm/slub.c:3992 but task is already holding lock: ffff88805b8b1be8 (&xfs_dquot_project_class){+.+.}-{3:3}, at: xfs_dqlock fs/xfs/xfs_dquot.h:125 [inline] ffff88805b8b1be8 (&xfs_dquot_project_class){+.+.}-{3:3}, at: xfs_qm_dqpurge+0xc5/0x630 fs/xfs/xfs_qm.c:129 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&xfs_dquot_project_class){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 xfs_dqlock fs/xfs/xfs_dquot.h:125 [inline] xfs_qm_dqrele+0x9f/0x250 fs/xfs/xfs_dquot.c:1122 xfs_qm_dqdetach+0x1a2/0x440 fs/xfs/xfs_qm.c:401 xfs_inode_mark_reclaimable+0x1e5/0xf60 fs/xfs/xfs_icache.c:2156 destroy_inode+0xc4/0x1b0 fs/inode.c:311 dispose_list+0x117/0x1e0 fs/inode.c:700 prune_icache_sb+0xeb/0x150 fs/inode.c:885 super_cache_scan+0x375/0x550 fs/super.c:223 do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa87/0x1310 mm/shrinker.c:626 shrink_one+0x493/0x7c0 mm/vmscan.c:4774 shrink_many mm/vmscan.c:4835 [inline] lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4935 shrink_node mm/vmscan.c:5894 [inline] kswapd_shrink_node mm/vmscan.c:6704 [inline] balance_pgdat+0x10d1/0x1a10 mm/vmscan.c:6895 kswapd+0x5ea/0xbf0 mm/vmscan.c:7164 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3698 [inline] fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3712 might_alloc include/linux/sched/mm.h:312 [inline] slab_pre_alloc_hook mm/slub.c:3746 [inline] slab_alloc_node mm/slub.c:3827 [inline] kmalloc_trace+0x51/0x330 mm/slub.c:3992 kmalloc include/linux/slab.h:628 [inline] add_stack_record_to_list mm/page_owner.c:177 [inline] inc_stack_record_count mm/page_owner.c:219 [inline] __set_page_owner+0x517/0x7a0 mm/page_owner.c:334 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575 __alloc_pages_bulk+0x742/0x14f0 mm/page_alloc.c:4523 alloc_pages_bulk_array include/linux/gfp.h:202 [inline] xfs_buf_alloc_pages+0x20f/0x9d0 fs/xfs/xfs_buf.c:398 xfs_buf_find_insert fs/xfs/xfs_buf.c:650 [inline] xfs_buf_get_map+0x1e69/0x30d0 fs/xfs/xfs_buf.c:755 xfs_buf_read_map+0xd2/0xb40 fs/xfs/xfs_buf.c:860 xfs_trans_read_buf_map+0x352/0x990 fs/xfs/xfs_trans_buf.c:289 xfs_trans_read_buf fs/xfs/xfs_trans.h:210 [inline] xfs_qm_dqflush+0x224/0x1470 fs/xfs/xfs_dquot.c:1271 xfs_qm_dqpurge+0x1d3/0x630 fs/xfs/xfs_qm.c:149 xfs_qm_dquot_walk.isra.0+0x217/0x3d0 fs/xfs/xfs_qm.c:88 xfs_qm_dqpurge_all fs/xfs/xfs_qm.c:195 [inline] xfs_qm_unmount+0xc7/0x1c0 fs/xfs/xfs_qm.c:206 xfs_unmountfs+0x76/0x240 fs/xfs/xfs_mount.c:1076 xfs_fs_put_super+0x61/0x160 fs/xfs/xfs_super.c:1134 generic_shutdown_super+0x159/0x3d0 fs/super.c:641 kill_block_super+0x3b/0x90 fs/super.c:1675 xfs_kill_sb+0x15/0x50 fs/xfs/xfs_super.c:2026 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472 deactivate_super+0xde/0x100 fs/super.c:505 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14e/0x250 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa7d/0x2c10 kernel/exit.c:878 do_group_exit+0xd3/0x2a0 kernel/exit.c:1027 get_signal+0x25c3/0x2670 kernel/signal.c:2911 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x14a/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x82/0x120 arch/x86/entry/common.c:389 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xfs_dquot_project_class); lock(fs_reclaim); lock(&xfs_dquot_project_class); lock(fs_reclaim); *** DEADLOCK *** 3 locks held by syz-executor.2/6646: #0: ffff88801ea1c0e0 (&type->s_umount_key#54){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88801ea1c0e0 (&type->s_umount_key#54){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88801ea1c0e0 (&type->s_umount_key#54){++++}-{3:3}, at: deactivate_super+0xd6/0x100 fs/super.c:504 #1: ffff88801ac2a158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dquot_walk.isra.0+0x111/0x3d0 fs/xfs/xfs_qm.c:75 #2: ffff88805b8b1be8 (&xfs_dquot_project_class){+.+.}-{3:3}, at: xfs_dqlock fs/xfs/xfs_dquot.h:125 [inline] #2: ffff88805b8b1be8 (&xfs_dquot_project_class){+.+.}-{3:3}, at: xfs_qm_dqpurge+0xc5/0x630 fs/xfs/xfs_qm.c:129 stack backtrace: CPU: 1 PID: 6646 Comm: syz-executor.2 Not tainted 6.9.0-rc6-syzkaller-00005-gb947cc5bf6d7 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3698 [inline] fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3712 might_alloc include/linux/sched/mm.h:312 [inline] slab_pre_alloc_hook mm/slub.c:3746 [inline] slab_alloc_node mm/slub.c:3827 [inline] kmalloc_trace+0x51/0x330 mm/slub.c:3992 kmalloc include/linux/slab.h:628 [inline] add_stack_record_to_list mm/page_owner.c:177 [inline] inc_stack_record_count mm/page_owner.c:219 [inline] __set_page_owner+0x517/0x7a0 mm/page_owner.c:334 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575 __alloc_pages_bulk+0x742/0x14f0 mm/page_alloc.c:4523 alloc_pages_bulk_array include/linux/gfp.h:202 [inline] xfs_buf_alloc_pages+0x20f/0x9d0 fs/xfs/xfs_buf.c:398 xfs_buf_find_insert fs/xfs/xfs_buf.c:650 [inline] xfs_buf_get_map+0x1e69/0x30d0 fs/xfs/xfs_buf.c:755 xfs_buf_read_map+0xd2/0xb40 fs/xfs/xfs_buf.c:860 xfs_trans_read_buf_map+0x352/0x990 fs/xfs/xfs_trans_buf.c:289 xfs_trans_read_buf fs/xfs/xfs_trans.h:210 [inline] xfs_qm_dqflush+0x224/0x1470 fs/xfs/xfs_dquot.c:1271 xfs_qm_dqpurge+0x1d3/0x630 fs/xfs/xfs_qm.c:149 xfs_qm_dquot_walk.isra.0+0x217/0x3d0 fs/xfs/xfs_qm.c:88 xfs_qm_dqpurge_all fs/xfs/xfs_qm.c:195 [inline] xfs_qm_unmount+0xc7/0x1c0 fs/xfs/xfs_qm.c:206 xfs_unmountfs+0x76/0x240 fs/xfs/xfs_mount.c:1076 xfs_fs_put_super+0x61/0x160 fs/xfs/xfs_super.c:1134 generic_shutdown_super+0x159/0x3d0 fs/super.c:641 kill_block_super+0x3b/0x90 fs/super.c:1675 xfs_kill_sb+0x15/0x50 fs/xfs/xfs_super.c:2026 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472 deactivate_super+0xde/0x100 fs/super.c:505 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14e/0x250 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa7d/0x2c10 kernel/exit.c:878 do_group_exit+0xd3/0x2a0 kernel/exit.c:1027 get_signal+0x25c3/0x2670 kernel/signal.c:2911 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x14a/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x82/0x120 arch/x86/entry/common.c:389 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf72fa579 Code: Unable to access opcode bytes at 0xf72fa54f. RSP: 002b:00000000f5eec5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000004 RAX: 0000000000000012 RBX: 0000000000000009 RCX: 0000000020000180 RDX: 0000000000000012 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000