RBP: 00007fa940570090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007fa93f935f80 R15: 00007fff140b0e18 ERROR: Out of memory at tomoyo_realpath_from_path. ====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc6-next-20241108-syzkaller #0 Not tainted ------------------------------------------------------ syz.5.1979/17619 is trying to acquire lock: ffff88814376e870 (&q->limits_lock){+.+.}-{4:4}, at: queue_limits_start_update include/linux/blkdev.h:944 [inline] ffff88814376e870 (&q->limits_lock){+.+.}-{4:4}, at: loop_reconfigure_limits+0x287/0x9f0 drivers/block/loop.c:1003 but task is already holding lock: ffff88814376e228 (&q->q_usage_counter(io)#24){++++}-{0:0}, at: loop_set_block_size drivers/block/loop.c:1472 [inline] ffff88814376e228 (&q->q_usage_counter(io)#24){++++}-{0:0}, at: lo_simple_ioctl drivers/block/loop.c:1496 [inline] ffff88814376e228 (&q->q_usage_counter(io)#24){++++}-{0:0}, at: lo_ioctl+0x1344/0x1f50 drivers/block/loop.c:1559 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #7 (&q->q_usage_counter(io)#24){++++}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 bio_queue_enter block/blk.h:75 [inline] blk_mq_submit_bio+0x1510/0x2490 block/blk-mq.c:3095 __submit_bio+0x2c2/0x560 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+0x306/0x660 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_btree_read_buf_block+0x36f/0x5b0 fs/xfs/libxfs/xfs_btree.c:1408 xfs_btree_lookup_get_block+0x316/0x5b0 fs/xfs/libxfs/xfs_btree.c:1909 xfs_btree_lookup+0x4eb/0x15e0 fs/xfs/libxfs/xfs_btree.c:2020 xfs_inobt_lookup fs/xfs/libxfs/xfs_ialloc.c:47 [inline] xfs_difree_inobt+0x17f/0xd40 fs/xfs/libxfs/xfs_ialloc.c:2086 xfs_difree+0x4d2/0x840 fs/xfs/libxfs/xfs_ialloc.c:2354 xfs_inode_uninit+0x79/0x320 fs/xfs/libxfs/xfs_inode_util.c:717 xfs_ifree+0x212/0x1520 fs/xfs/xfs_inode.c:1783 xfs_inactive_ifree+0x192/0x4c0 fs/xfs/xfs_inode.c:1241 xfs_inactive+0x8ff/0xc90 fs/xfs/xfs_inode.c:1459 xfs_inodegc_inactivate fs/xfs/xfs_icache.c:1885 [inline] xfs_inodegc_worker+0x33f/0x820 fs/xfs/xfs_icache.c:1931 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #6 (&xfs_nondir_ilock_class#3){++++}-{4:4}: 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:1099 xfs_qm_dqusage_adjust+0x4db/0x6f0 fs/xfs/xfs_qm.c:1218 xfs_iwalk_ag_recs+0x4e0/0x860 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+0x7f/0x190 fs/xfs/xfs_pwork.c:47 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #5 (sb_internal#4){.+.+}-{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:1724 [inline] sb_start_intwrite include/linux/fs.h:1907 [inline] xfs_trans_alloc+0xe5/0x830 fs/xfs/xfs_trans.c:264 xfs_fs_dirty_inode+0x158/0x250 fs/xfs/xfs_super.c:691 __mark_inode_dirty+0x2ee/0xe90 fs/fs-writeback.c:2491 generic_update_time+0xad/0xc0 fs/inode.c:2110 xfs_vn_update_time+0x2a5/0x600 fs/xfs/xfs_iops.c:1093 inode_update_time fs/inode.c:2122 [inline] __file_update_time fs/inode.c:2351 [inline] file_update_time+0x314/0x450 fs/inode.c:2381 xfs_write_fault fs/xfs/xfs_file.c:1462 [inline] __xfs_filemap_fault+0x4f6/0xbc0 fs/xfs/xfs_file.c:1507 do_page_mkwrite+0x198/0x480 mm/memory.c:3176 do_shared_fault mm/memory.c:5398 [inline] do_fault mm/memory.c:5460 [inline] do_pte_missing mm/memory.c:3979 [inline] handle_pte_fault+0x122e/0x66b0 mm/memory.c:5801 __handle_mm_fault mm/memory.c:5944 [inline] handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6112 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #4 (sb_pagefaults#2){.+.+}-{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:1724 [inline] sb_start_pagefault include/linux/fs.h:1889 [inline] xfs_write_fault fs/xfs/xfs_file.c:1461 [inline] __xfs_filemap_fault+0x284/0xbc0 fs/xfs/xfs_file.c:1507 do_page_mkwrite+0x198/0x480 mm/memory.c:3176 do_shared_fault mm/memory.c:5398 [inline] do_fault mm/memory.c:5460 [inline] do_pte_missing mm/memory.c:3979 [inline] handle_pte_fault+0x122e/0x66b0 mm/memory.c:5801 __handle_mm_fault mm/memory.c:5944 [inline] handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6112 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #3 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __might_fault+0xc6/0x120 mm/memory.c:6751 _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+0xf5/0x170 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 -> #2 (&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+0x2b8/0xad0 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+0x24e/0x2e0 drivers/base/bus.c:459 __device_attach_async_helper+0x22d/0x300 drivers/base/dd.c:987 async_run_entry_fn+0xa8/0x420 kernel/async.c:129 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #1 (&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+0x26b/0xab0 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+0x1019/0xbcf0 drivers/scsi/sd.c:3734 sd_probe+0x9fa/0x1100 drivers/scsi/sd.c:4010 really_probe+0x2b8/0xad0 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+0x24e/0x2e0 drivers/base/bus.c:459 __device_attach_async_helper+0x22d/0x300 drivers/base/dd.c:987 async_run_entry_fn+0xa8/0x420 kernel/async.c:129 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 (&q->limits_lock){+.+.}-{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 __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:944 [inline] loop_reconfigure_limits+0x287/0x9f0 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+0x57d/0x6a0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 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 other info that might help us debug this: Chain exists of: &q->limits_lock --> &xfs_nondir_ilock_class#3 --> &q->q_usage_counter(io)#24 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&q->q_usage_counter(io)#24); lock(&xfs_nondir_ilock_class#3); lock(&q->q_usage_counter(io)#24); lock(&q->limits_lock); *** DEADLOCK *** 3 locks held by syz.5.1979/17619: #0: ffff8880251df360 (&lo->lo_mutex){+.+.}-{4:4}, at: lo_simple_ioctl drivers/block/loop.c:1485 [inline] #0: ffff8880251df360 (&lo->lo_mutex){+.+.}-{4:4}, at: lo_ioctl+0x606/0x1f50 drivers/block/loop.c:1559 #1: ffff88814376e228 (&q->q_usage_counter(io)#24){++++}-{0:0}, at: loop_set_block_size drivers/block/loop.c:1472 [inline] #1: ffff88814376e228 (&q->q_usage_counter(io)#24){++++}-{0:0}, at: lo_simple_ioctl drivers/block/loop.c:1496 [inline] #1: ffff88814376e228 (&q->q_usage_counter(io)#24){++++}-{0:0}, at: lo_ioctl+0x1344/0x1f50 drivers/block/loop.c:1559 #2: ffff88814376e260 (&q->q_usage_counter(queue)#8){+.+.}-{0:0}, at: loop_set_block_size drivers/block/loop.c:1472 [inline] #2: ffff88814376e260 (&q->q_usage_counter(queue)#8){+.+.}-{0:0}, at: lo_simple_ioctl drivers/block/loop.c:1496 [inline] #2: ffff88814376e260 (&q->q_usage_counter(queue)#8){+.+.}-{0:0}, at: lo_ioctl+0x1344/0x1f50 drivers/block/loop.c:1559 stack backtrace: CPU: 0 UID: 0 PID: 17619 Comm: syz.5.1979 Not tainted 6.12.0-rc6-next-20241108-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 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 __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:944 [inline] loop_reconfigure_limits+0x287/0x9f0 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+0x57d/0x6a0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 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 RIP: 0033:0x7fa93f77e719 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa940570038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa93f935f80 RCX: 00007fa93f77e719 RDX: 0000000000000000 RSI: 0000000000004c09 RDI: 0000000000000003 RBP: 00007fa940570090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007fa93f935f80 R15: 00007fff140b0e18