loop3: detected capacity change from 0 to 4096 EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ====================================================== WARNING: possible circular locking dependency detected 6.12.0-next-20241128-syzkaller #0 Not tainted ------------------------------------------------------ syz.3.1647/10639 is trying to acquire lock: ffff88807f476598 (&ei->i_data_sem){++++}-{4:4}, at: ext4_truncate+0x994/0x11c0 fs/ext4/inode.c:4212 but task is already holding lock: ffff888029b82610 (sb_internal){++++}-{0:0}, at: __sb_start_write include/linux/fs.h:1725 [inline] ffff888029b82610 (sb_internal){++++}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1908 [inline] ffff888029b82610 (sb_internal){++++}-{0:0}, at: ext4_evict_inode+0x2f4/0xf50 fs/ext4/inode.c:217 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #7 (sb_internal){++++}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 percpu_down_write+0x54/0x310 kernel/locking/percpu-rwsem.c:229 sb_wait_write fs/super.c:1910 [inline] freeze_super+0x7cc/0xee0 fs/super.c:2118 fs_bdev_freeze+0x1ac/0x320 fs/super.c:1484 bdev_freeze+0xd6/0x220 block/bdev.c:257 ext4_force_shutdown+0x319/0x550 fs/ext4/ioctl.c:822 ext4_ioctl_shutdown fs/ext4/ioctl.c:857 [inline] __ext4_ioctl fs/ext4/ioctl.c:1580 [inline] ext4_ioctl+0x2145/0x58d0 fs/ext4/ioctl.c:1619 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 -> #6 (sb_pagefaults){++++}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1725 [inline] sb_start_pagefault include/linux/fs.h:1890 [inline] ext4_page_mkwrite+0x1ef/0xdf0 fs/ext4/inode.c:6158 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+0x2b9/0x8b0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #5 (&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 -> #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+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->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 -> #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: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 -> #1 (&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_init_cache+0x484/0x1670 fs/ext4/mballoc.c:1337 ext4_mb_init_group+0x324/0x6f0 fs/ext4/mballoc.c:1543 ext4_mb_load_buddy_gfp+0xd83/0x1490 fs/ext4/mballoc.c:1613 ext4_mb_load_buddy fs/ext4/mballoc.c:1733 [inline] ext4_mb_find_by_goal+0x1e7/0xed0 fs/ext4/mballoc.c:2346 ext4_mb_regular_allocator+0x24a/0x3bb0 fs/ext4/mballoc.c:2818 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_get_block+0x239/0x6b0 fs/ext4/inode.c:781 ext4_get_block_unwritten+0x2f/0x100 fs/ext4/inode.c:814 ext4_block_write_begin+0x55a/0x1980 fs/ext4/inode.c:1063 ext4_write_begin+0x61c/0x11b0 ext4_da_write_begin+0x300/0xa60 fs/ext4/inode.c:2925 pagecache_write+0x23d/0x430 fs/ext4/verity.c:83 write_merkle_tree_block fs/verity/enable.c:56 [inline] build_merkle_tree fs/verity/enable.c:163 [inline] enable_verity+0x199a/0x2050 fs/verity/enable.c:253 fsverity_ioctl_enable+0x471/0x5c0 fs/verity/enable.c:378 __ext4_ioctl fs/ext4/ioctl.c:1585 [inline] ext4_ioctl+0x1957/0x58d0 fs/ext4/ioctl.c:1619 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 -> #0 (&ei->i_data_sem){++++}-{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+0x99/0x220 kernel/locking/rwsem.c:1577 ext4_truncate+0x994/0x11c0 fs/ext4/inode.c:4212 ext4_evict_inode+0x90f/0xf50 fs/ext4/inode.c:263 evict+0x4e8/0x9a0 fs/inode.c:796 __dentry_kill+0x20d/0x630 fs/dcache.c:625 dput+0x19f/0x2b0 fs/dcache.c:867 do_renameat2+0xda1/0x13f0 fs/namei.c:5226 __do_sys_rename fs/namei.c:5271 [inline] __se_sys_rename fs/namei.c:5269 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5269 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 --> sb_pagefaults --> sb_internal Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_internal); lock(sb_pagefaults); lock(sb_internal); lock(&ei->i_data_sem); *** DEADLOCK *** 5 locks held by syz.3.1647/10639: #0: ffff888029b82420 (sb_writers#4){++++}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff888029b82730 (&type->s_vfs_rename_key#2){+.+.}-{4:4}, at: lock_rename fs/namei.c:3219 [inline] #1: ffff888029b82730 (&type->s_vfs_rename_key#2){+.+.}-{4:4}, at: do_renameat2+0x5cf/0x13f0 fs/namei.c:5159 #2: ffff8880596ec950 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:853 [inline] #2: ffff8880596ec950 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x1a8/0x220 fs/namei.c:3195 #3: ffff8880596ed338 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:853 [inline] #3: ffff8880596ed338 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x1d1/0x220 fs/namei.c:3196 #4: ffff888029b82610 (sb_internal){++++}-{0:0}, at: __sb_start_write include/linux/fs.h:1725 [inline] #4: ffff888029b82610 (sb_internal){++++}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1908 [inline] #4: ffff888029b82610 (sb_internal){++++}-{0:0}, at: ext4_evict_inode+0x2f4/0xf50 fs/ext4/inode.c:217 stack backtrace: CPU: 0 UID: 0 PID: 10639 Comm: syz.3.1647 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_write+0x99/0x220 kernel/locking/rwsem.c:1577 ext4_truncate+0x994/0x11c0 fs/ext4/inode.c:4212 ext4_evict_inode+0x90f/0xf50 fs/ext4/inode.c:263 evict+0x4e8/0x9a0 fs/inode.c:796 __dentry_kill+0x20d/0x630 fs/dcache.c:625 dput+0x19f/0x2b0 fs/dcache.c:867 do_renameat2+0xda1/0x13f0 fs/namei.c:5226 __do_sys_rename fs/namei.c:5271 [inline] __se_sys_rename fs/namei.c:5269 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5269 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: 0033:0x7f9e5097ff19 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:00007f9e517f9058 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007f9e50b45fa0 RCX: 00007f9e5097ff19 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000020000040 RBP: 00007f9e509f3986 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9e50b45fa0 R15: 00007fff5c27f848