====================================================== WARNING: possible circular locking dependency detected 6.12.0-syzkaller-01518-ga5c93bfec0be #0 Not tainted ------------------------------------------------------ kworker/u8:0/11 is trying to acquire lock: ffff888057bdce98 (&xfs_nondir_ilock_class#3){++++}-{4:4}, at: xfs_dquot_disk_alloc+0x399/0xe20 fs/xfs/xfs_dquot.c:332 but task is already holding lock: ffff888078dc4610 (sb_internal#3){++++}-{0:0}, at: xfs_dquot_disk_alloc+0x36f/0xe20 fs/xfs/xfs_dquot.c:327 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (sb_internal#3){++++}-{0:0}: lock_acquire+0x1ed/0x550 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] xfs_trans_alloc+0xe5/0x830 fs/xfs/xfs_trans.c:264 xfs_vn_update_time+0x203/0x600 fs/xfs/xfs_iops.c:1101 inode_update_time fs/inode.c:2125 [inline] touch_atime+0x27f/0x690 fs/inode.c:2198 file_accessed include/linux/fs.h:2539 [inline] xfs_file_mmap+0x1ab/0x530 fs/xfs/xfs_file.c:1587 call_mmap include/linux/fs.h:2183 [inline] mmap_file mm/internal.h:123 [inline] __mmap_region mm/mmap.c:1453 [inline] mmap_region+0x1a2c/0x23f0 mm/mmap.c:1603 do_mmap+0x8f0/0x1000 mm/mmap.c:496 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #5 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __might_fault+0xc6/0x120 mm/memory.c:6716 _inline_copy_from_user include/linux/uaccess.h:162 [inline] _copy_from_user+0x2a/0xc0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] __blk_trace_setup kernel/trace/blktrace.c:626 [inline] blk_trace_ioctl+0x1ad/0x9a0 kernel/trace/blktrace.c:740 blkdev_ioctl+0x40c/0x6a0 block/ioctl.c:682 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf7/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #4 (&q->debugfs_mutex){+.+.}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735 blk_mq_init_sched+0x3fa/0x830 block/blk-mq-sched.c:473 elevator_init_mq+0x20e/0x320 block/elevator.c:610 add_disk_fwnode+0x10d/0xf80 block/genhd.c:413 sd_probe+0xba6/0x1100 drivers/scsi/sd.c:4024 really_probe+0x2ba/0xad0 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800 driver_probe_device+0x50/0x430 drivers/base/dd.c:830 __device_attach_driver+0x2d6/0x530 drivers/base/dd.c:958 bus_for_each_drv+0x250/0x2e0 drivers/base/bus.c:459 __device_attach_async_helper+0x22d/0x300 drivers/base/dd.c:987 async_run_entry_fn+0xaa/0x420 kernel/async.c:129 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #3 (&q->q_usage_counter(queue)#50){++++}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 blk_queue_enter+0xe1/0x600 block/blk-core.c:328 blk_mq_alloc_request+0x4fa/0xaa0 block/blk-mq.c:652 scsi_alloc_request drivers/scsi/scsi_lib.c:1222 [inline] scsi_execute_cmd+0x177/0x1090 drivers/scsi/scsi_lib.c:304 read_capacity_16+0x2b4/0x1450 drivers/scsi/sd.c:2655 sd_read_capacity drivers/scsi/sd.c:2824 [inline] sd_revalidate_disk+0x1013/0xbce0 drivers/scsi/sd.c:3734 sd_probe+0x9fa/0x1100 drivers/scsi/sd.c:4010 really_probe+0x2ba/0xad0 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800 driver_probe_device+0x50/0x430 drivers/base/dd.c:830 __device_attach_driver+0x2d6/0x530 drivers/base/dd.c:958 bus_for_each_drv+0x250/0x2e0 drivers/base/bus.c:459 __device_attach_async_helper+0x22d/0x300 drivers/base/dd.c:987 async_run_entry_fn+0xaa/0x420 kernel/async.c:129 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #2 (&q->limits_lock){+.+.}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735 queue_limits_start_update include/linux/blkdev.h:945 [inline] loop_reconfigure_limits+0x283/0x9e0 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+0x1351/0x1f50 drivers/block/loop.c:1559 blkdev_ioctl+0x57f/0x6a0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf7/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&q->q_usage_counter(io)#17){++++}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 bio_queue_enter block/blk.h:75 [inline] blk_mq_submit_bio+0x1536/0x23a0 block/blk-mq.c:3092 __submit_bio+0x2c6/0x560 block/blk-core.c:629 __submit_bio_noacct_mq block/blk-core.c:710 [inline] submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:739 xfs_buf_ioapply_map+0x461/0x5d0 fs/xfs/xfs_buf.c:1586 _xfs_buf_ioapply+0x307/0x660 fs/xfs/xfs_buf.c:1674 __xfs_buf_submit+0x34f/0x7f0 fs/xfs/xfs_buf.c:1758 xfs_buf_submit fs/xfs/xfs_buf.c:61 [inline] _xfs_buf_read fs/xfs/xfs_buf.c:809 [inline] xfs_buf_read_map+0x431/0xa60 fs/xfs/xfs_buf.c:873 xfs_trans_read_buf_map+0x260/0xad0 fs/xfs/xfs_trans_buf.c:289 xfs_trans_read_buf fs/xfs/xfs_trans.h:212 [inline] xfs_read_agf+0x2e2/0x680 fs/xfs/libxfs/xfs_alloc.c:3367 xfs_alloc_read_agf+0x1c7/0xcb0 fs/xfs/libxfs/xfs_alloc.c:3401 xfs_alloc_fix_freelist+0x614/0x1b90 fs/xfs/libxfs/xfs_alloc.c:2863 xfs_alloc_vextent_prepare_ag+0xf7/0x6b0 fs/xfs/libxfs/xfs_alloc.c:3532 xfs_alloc_vextent_iterate_ags+0x140/0x950 fs/xfs/libxfs/xfs_alloc.c:3717 xfs_alloc_vextent_start_ag+0x3f6/0x950 fs/xfs/libxfs/xfs_alloc.c:3806 xfs_bmap_btalloc_best_length fs/xfs/libxfs/xfs_bmap.c:3731 [inline] xfs_bmap_btalloc fs/xfs/libxfs/xfs_bmap.c:3776 [inline] xfs_bmapi_allocate+0x18f6/0x3450 fs/xfs/libxfs/xfs_bmap.c:4189 xfs_bmapi_write+0xbac/0x1b40 fs/xfs/libxfs/xfs_bmap.c:4518 xfs_dquot_disk_alloc+0x5f4/0xe20 fs/xfs/xfs_dquot.c:350 xfs_qm_dqread+0x1a3/0x650 fs/xfs/xfs_dquot.c:689 xfs_qm_dqget+0x2bb/0x6f0 fs/xfs/xfs_dquot.c:901 xfs_qm_quotacheck_dqadjust+0xea/0x5a0 fs/xfs/xfs_qm.c:1101 xfs_qm_dqusage_adjust+0x4db/0x6f0 fs/xfs/xfs_qm.c:1220 xfs_iwalk_ag_recs+0x4e2/0x860 fs/xfs/xfs_iwalk.c:213 xfs_iwalk_run_callbacks+0x218/0x470 fs/xfs/xfs_iwalk.c:371 xfs_iwalk_ag+0xa39/0xb50 fs/xfs/xfs_iwalk.c:477 xfs_iwalk_ag_work+0xfb/0x1b0 fs/xfs/xfs_iwalk.c:619 xfs_pwork_work+0x81/0x190 fs/xfs/xfs_pwork.c:47 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 (&xfs_nondir_ilock_class#3){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 down_write_nested+0xa2/0x220 kernel/locking/rwsem.c:1693 xfs_dquot_disk_alloc+0x399/0xe20 fs/xfs/xfs_dquot.c:332 xfs_qm_dqread+0x1a3/0x650 fs/xfs/xfs_dquot.c:689 xfs_qm_dqget+0x2bb/0x6f0 fs/xfs/xfs_dquot.c:901 xfs_qm_quotacheck_dqadjust+0xea/0x5a0 fs/xfs/xfs_qm.c:1101 xfs_qm_dqusage_adjust+0x4db/0x6f0 fs/xfs/xfs_qm.c:1220 xfs_iwalk_ag_recs+0x4e2/0x860 fs/xfs/xfs_iwalk.c:213 xfs_iwalk_run_callbacks+0x218/0x470 fs/xfs/xfs_iwalk.c:371 xfs_iwalk_ag+0xa39/0xb50 fs/xfs/xfs_iwalk.c:477 xfs_iwalk_ag_work+0xfb/0x1b0 fs/xfs/xfs_iwalk.c:619 xfs_pwork_work+0x81/0x190 fs/xfs/xfs_pwork.c:47 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/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: &xfs_nondir_ilock_class#3 --> &mm->mmap_lock --> sb_internal#3 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_internal#3); lock(&mm->mmap_lock); lock(sb_internal#3); lock(&xfs_nondir_ilock_class#3); *** DEADLOCK *** 3 locks held by kworker/u8:0/11: #0: ffff888077c78148 ((wq_completion)xfs_iwalk-29254){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff888077c78148 ((wq_completion)xfs_iwalk-29254){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90000107d00 ((work_completion)(&pwork->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90000107d00 ((work_completion)(&pwork->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffff888078dc4610 (sb_internal#3){++++}-{0:0}, at: xfs_dquot_disk_alloc+0x36f/0xe20 fs/xfs/xfs_dquot.c:327 stack backtrace: CPU: 0 UID: 0 PID: 11 Comm: kworker/u8:0 Not tainted 6.12.0-syzkaller-01518-ga5c93bfec0be #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Workqueue: xfs_iwalk-29254 xfs_pwork_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 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+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 down_write_nested+0xa2/0x220 kernel/locking/rwsem.c:1693 xfs_dquot_disk_alloc+0x399/0xe20 fs/xfs/xfs_dquot.c:332 xfs_qm_dqread+0x1a3/0x650 fs/xfs/xfs_dquot.c:689 xfs_qm_dqget+0x2bb/0x6f0 fs/xfs/xfs_dquot.c:901 xfs_qm_quotacheck_dqadjust+0xea/0x5a0 fs/xfs/xfs_qm.c:1101 xfs_qm_dqusage_adjust+0x4db/0x6f0 fs/xfs/xfs_qm.c:1220 xfs_iwalk_ag_recs+0x4e2/0x860 fs/xfs/xfs_iwalk.c:213 xfs_iwalk_run_callbacks+0x218/0x470 fs/xfs/xfs_iwalk.c:371 xfs_iwalk_ag+0xa39/0xb50 fs/xfs/xfs_iwalk.c:477 xfs_iwalk_ag_work+0xfb/0x1b0 fs/xfs/xfs_iwalk.c:619 xfs_pwork_work+0x81/0x190 fs/xfs/xfs_pwork.c:47 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244