loop8: detected capacity change from 0 to 512 EXT4-fs (loop8): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /120/bus supports timestamps until 2038-01-19 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 6.12.0-next-20241128-syzkaller #0 Not tainted ------------------------------------------------------ syz.8.3192/14311 is trying to acquire lock: ffff8880530c47e0 (&ei->i_data_sem/2){++++}-{4:4}, at: ext4_map_blocks+0x3be/0x1990 fs/ext4/inode.c:665 but task is already holding lock: ffff88807e4a4210 (&s->s_dquot.dqio_sem){++++}-{4:4}, at: v2_write_dquot+0xab/0x270 fs/quota/quota_v2.c:367 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #8 (&s->s_dquot.dqio_sem){++++}-{4:4} : lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 ocfs2_mark_dquot_dirty+0x609/0xe00 fs/ocfs2/quota_global.c:961 mark_dquot_dirty fs/quota/dquot.c:370 [inline] do_set_dqblk fs/quota/dquot.c:2808 [inline] dquot_set_dqblk+0xcf3/0xf30 fs/quota/dquot.c:2825 quota_setquota+0x6dc/0x850 fs/quota/quota.c:310 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl+0x2c4/0xa30 fs/quota/quota.c:917 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 -> #7 (jbd2_handle){++++}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 start_this_handle+0x1eb4/0x2110 fs/jbd2/transaction.c:448 jbd2__journal_start+0x2da/0x5d0 fs/jbd2/transaction.c:505 __ext4_journal_start_sb+0x239/0x600 fs/ext4/ext4_jbd2.c:112 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x92/0x110 fs/ext4/inode.c:6038 __mark_inode_dirty+0x2ee/0xe90 fs/fs-writeback.c:2515 generic_update_time fs/inode.c:2112 [inline] inode_update_time fs/inode.c:2125 [inline] touch_atime+0x413/0x690 fs/inode.c:2197 file_accessed include/linux/fs.h:2539 [inline] ext4_file_mmap+0x18c/0x540 fs/ext4/file.c:816 call_mmap include/linux/fs.h:2183 [inline] mmap_file mm/internal.h:124 [inline] __mmap_new_file_vma mm/vma.c:2291 [inline] __mmap_new_vma mm/vma.c:2355 [inline] __mmap_region+0x2204/0x2cd0 mm/vma.c:2456 mmap_region+0x226/0x2c0 mm/mmap.c:1347 do_mmap+0x8f0/0x1000 mm/mmap.c:496 vm_mmap_pgoff+0x214/0x430 mm/util.c:580 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 -> #6 (&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_setup+0xd2/0x1e0 kernel/trace/blktrace.c:648 sg_ioctl_common drivers/scsi/sg.c:1114 [inline] sg_ioctl+0xa46/0x2e80 drivers/scsi/sg.c:1156 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 -> #5 (&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+0xa66/0x1840 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 -> #4 (&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:651 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+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+0xa66/0x1840 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 -> #3 (&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:949 [inline] loop_reconfigure_limits+0x43f/0x900 drivers/block/loop.c:998 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 -> #2 (&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+0x1536/0x2390 block/blk-mq.c:3091 __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 ext4_read_block_bitmap_nowait+0x7c5/0xa80 fs/ext4/balloc.c:551 ext4_mb_prefetch+0x240/0x380 fs/ext4/mballoc.c:2749 ext4_mb_regular_allocator+0xb44/0x3bb0 fs/ext4/mballoc.c:2898 ext4_mb_new_blocks+0x10a8/0x4e00 fs/ext4/mballoc.c:6217 ext4_ext_map_blocks+0x1be0/0x7d30 fs/ext4/extents.c:4379 ext4_map_create_blocks fs/ext4/inode.c:516 [inline] ext4_map_blocks+0x8bf/0x1990 fs/ext4/inode.c:702 ext4_getblk+0x1fa/0x880 fs/ext4/inode.c:849 ext4_bread+0x2e/0x180 fs/ext4/inode.c:912 ext4_quota_write+0x223/0x580 fs/ext4/super.c:7285 write_blk+0x123/0x240 fs/quota/quota_tree.c:70 do_insert_tree+0xca1/0x1490 fs/quota/quota_tree.c:407 do_insert_tree+0xb90/0x1490 fs/quota/quota_tree.c:402 do_insert_tree+0xb90/0x1490 fs/quota/quota_tree.c:402 do_insert_tree+0xb90/0x1490 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x496/0x5b0 fs/quota/quota_tree.c:451 v2_write_dquot+0x17a/0x270 fs/quota/quota_v2.c:372 dquot_acquire+0x34f/0x680 fs/quota/dquot.c:470 ext4_acquire_dquot+0x301/0x4c0 fs/ext4/super.c:6934 dqget+0x770/0xeb0 fs/quota/dquot.c:977 __dquot_initialize+0x468/0xec0 fs/quota/dquot.c:1505 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0xb77/0x13d0 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5610 [inline] ext4_fill_super+0x64dc/0x6e60 fs/ext4/super.c:5733 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 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 (&lg->lg_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 ext4_mb_group_or_file fs/ext4/mballoc.c:5786 [inline] ext4_mb_initialize_context+0x8ac/0xce0 fs/ext4/mballoc.c:5830 ext4_mb_new_blocks+0x681/0x4e00 fs/ext4/mballoc.c:6204 ext4_ext_map_blocks+0x1be0/0x7d30 fs/ext4/extents.c:4379 ext4_map_create_blocks fs/ext4/inode.c:516 [inline] ext4_map_blocks+0x8bf/0x1990 fs/ext4/inode.c:702 ext4_getblk+0x1fa/0x880 fs/ext4/inode.c:849 ext4_bread+0x2e/0x180 fs/ext4/inode.c:912 ext4_quota_write+0x223/0x580 fs/ext4/super.c:7285 write_blk+0x123/0x240 fs/quota/quota_tree.c:70 do_insert_tree+0xca1/0x1490 fs/quota/quota_tree.c:407 do_insert_tree+0xb90/0x1490 fs/quota/quota_tree.c:402 do_insert_tree+0xb90/0x1490 fs/quota/quota_tree.c:402 do_insert_tree+0xb90/0x1490 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x496/0x5b0 fs/quota/quota_tree.c:451 v2_write_dquot+0x17a/0x270 fs/quota/quota_v2.c:372 dquot_acquire+0x34f/0x680 fs/quota/dquot.c:470 ext4_acquire_dquot+0x301/0x4c0 fs/ext4/super.c:6934 dqget+0x770/0xeb0 fs/quota/dquot.c:977 __dquot_initialize+0x468/0xec0 fs/quota/dquot.c:1505 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0xb77/0x13d0 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5610 [inline] ext4_fill_super+0x64dc/0x6e60 fs/ext4/super.c:5733 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 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 -> #0 (&ei->i_data_sem/2){++++}-{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_read+0xb1/0xa40 kernel/locking/rwsem.c:1524 ext4_map_blocks+0x3be/0x1990 fs/ext4/inode.c:665 ext4_getblk+0x1fa/0x880 fs/ext4/inode.c:849 ext4_bread+0x2e/0x180 fs/ext4/inode.c:912 ext4_quota_write+0x223/0x580 fs/ext4/super.c:7285 write_blk fs/quota/quota_tree.c:70 [inline] get_free_dqblk+0x332/0x690 fs/quota/quota_tree.c:136 do_insert_tree+0x2c5/0x1490 fs/quota/quota_tree.c:347 do_insert_tree+0xbd6/0x1490 fs/quota/quota_tree.c:402 do_insert_tree+0xb90/0x1490 fs/quota/quota_tree.c:402 do_insert_tree+0xb90/0x1490 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x496/0x5b0 fs/quota/quota_tree.c:451 v2_write_dquot+0x17a/0x270 fs/quota/quota_v2.c:372 dquot_acquire+0x34f/0x680 fs/quota/dquot.c:470 ext4_acquire_dquot+0x301/0x4c0 fs/ext4/super.c:6934 dqget+0x770/0xeb0 fs/quota/dquot.c:977 dquot_transfer+0x2c2/0x6d0 fs/quota/dquot.c:2140 ext4_setattr+0xb49/0x1da0 fs/ext4/inode.c:5400 notify_change+0xbca/0xe90 fs/attr.c:552 chown_common+0x501/0x850 fs/open.c:778 do_fchownat+0x16a/0x240 fs/open.c:809 __do_sys_lchown fs/open.c:834 [inline] __se_sys_lchown fs/open.c:832 [inline] __x64_sys_lchown+0x85/0xa0 fs/open.c:832 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: &ei->i_data_sem/2 --> jbd2_handle --> &s->s_dquot.dqio_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&s->s_dquot.dqio_sem); lock(jbd2_handle); lock(&s->s_dquot.dqio_sem); rlock(&ei->i_data_sem/2); *** DEADLOCK *** 5 locks held by syz.8.3192/14311: #0: ffff88807e4a4420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff88805c5c6708 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline] #1: ffff88805c5c6708 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: chown_common+0x3e1/0x850 fs/open.c:768 #2: ffff88805c5c63d8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_setattr+0xb37/0x1da0 fs/ext4/inode.c:5399 #3: ffff88805ffe8b28 (&dquot->dq_lock){+.+.}-{4:4}, at: dquot_acquire+0x69/0x680 fs/quota/dquot.c:458 #4: ffff88807e4a4210 (&s->s_dquot.dqio_sem){++++}-{4:4}, at: v2_write_dquot+0xab/0x270 fs/quota/quota_v2.c:367 stack backtrace: CPU: 1 UID: 0 PID: 14311 Comm: syz.8.3192 Not tainted 6.12.0-next-20241128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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 down_read+0xb1/0xa40 kernel/locking/rwsem.c:1524 ext4_map_blocks+0x3be/0x1990 fs/ext4/inode.c:665 ext4_getblk+0x1fa/0x880 fs/ext4/inode.c:849 ext4_bread+0x2e/0x180 fs/ext4/inode.c:912 ext4_quota_write+0x223/0x580 fs/ext4/super.c:7285 write_blk fs/quota/quota_tree.c:70 [inline] get_free_dqblk+0x332/0x690 fs/quota/quota_tree.c:136 do_insert_tree+0x2c5/0x1490 fs/quota/quota_tree.c:347 do_insert_tree+0xbd6/0x1490 fs/quota/quota_tree.c:402 do_insert_tree+0xb90/0x1490 fs/quota/quota_tree.c:402 do_insert_tree+0xb90/0x1490 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x496/0x5b0 fs/quota/quota_tree.c:451 v2_write_dquot+0x17a/0x270 fs/quota/quota_v2.c:372 dquot_acquire+0x34f/0x680 fs/quota/dquot.c:470 ext4_acquire_dquot+0x301/0x4c0 fs/ext4/super.c:6934 dqget+0x770/0xeb0 fs/quota/dquot.c:977 dquot_transfer+0x2c2/0x6d0 fs/quota/dquot.c:2140 ext4_setattr+0xb49/0x1da0 fs/ext4/inode.c:5400 notify_change+0xbca/0xe90 fs/attr.c:552 chown_common+0x501/0x850 fs/open.c:778 do_fchownat+0x16a/0x240 fs/open.c:809 __do_sys_lchown fs/open.c:834 [inline] __se_sys_lchown fs/open.c:832 [inline] __x64_sys_lchown+0x85/0xa0 fs/open.c:832 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: 0033:0x7f3e66380849 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:00007f3e641f6058 EFLAGS: 00000246 ORIG_RAX: 000000000000005e RAX: ffffffffffffffda RBX: 00007f3e66545fa0 RCX: 00007f3e66380849 RDX: 000000000000ee01 RSI: 000000000000ee00 RDI: 00000000200017c0 RBP: 00007f3e663f3986 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f3e66545fa0 R15: 00007ffed13b6278