loop5: detected capacity change from 0 to 2048 NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS error (device loop5): nilfs_bmap_lookup_at_level: broken bmap (inode number=6) ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc4-syzkaller-00011-gf15d97df5afa #0 Not tainted ------------------------------------------------------ syz.5.2936/19905 is trying to acquire lock: ffff88805cbbd090 (&nilfs->ns_sem){++++}-{4:4}, at: nilfs_set_error fs/nilfs2/super.c:92 [inline] ffff88805cbbd090 (&nilfs->ns_sem){++++}-{4:4}, at: __nilfs_error+0x1ca/0x4b0 fs/nilfs2/super.c:141 but task is already holding lock: ffff88807d0f2c70 (&dat_lock_key){.+.+}-{4:4}, at: __nilfs_read_inode fs/nilfs2/inode.c:452 [inline] ffff88807d0f2c70 (&dat_lock_key){.+.+}-{4:4}, at: nilfs_iget+0x1ce/0x810 fs/nilfs2/inode.c:564 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&dat_lock_key){.+.+}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1524 nilfs_get_block+0x1b1/0x8f0 fs/nilfs2/inode.c:83 do_mpage_readpage+0x870/0x19a0 fs/mpage.c:222 mpage_readahead+0x398/0x650 fs/mpage.c:371 read_pages+0x17a/0x590 mm/readahead.c:160 page_cache_ra_unbounded+0x6b0/0x7b0 mm/readahead.c:297 filemap_get_pages+0x43c/0x1eb0 mm/filemap.c:2591 filemap_read+0x3fa/0x11d0 mm/filemap.c:2702 __kernel_read+0x46c/0x8c0 fs/read_write.c:528 integrity_kernel_read+0x89/0xd0 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:480 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0x152c/0x18d0 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x42e/0x8e0 security/integrity/ima/ima_api.c:293 process_measurement+0x1121/0x1a40 security/integrity/ima/ima_main.c:385 ima_file_check+0xd7/0x120 security/integrity/ima/ima_main.c:613 security_file_post_open+0xbb/0x290 security/security.c:3130 do_open fs/namei.c:3882 [inline] path_openat+0x2f26/0x3830 fs/namei.c:4039 do_filp_open+0x1fa/0x410 fs/namei.c:4066 do_sys_openat2+0x121/0x1c0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (mapping.invalidate_lock#9){.+.+}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] filemap_fault+0x546/0x1200 mm/filemap.c:3391 __do_fault+0x138/0x390 mm/memory.c:5098 do_shared_fault mm/memory.c:5582 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x17f9/0x5380 mm/memory.c:6140 handle_mm_fault+0x3f6/0x8c0 mm/memory.c:6309 faultin_page mm/gup.c:1193 [inline] __get_user_pages+0x16f0/0x2a40 mm/gup.c:1491 __get_user_pages_locked mm/gup.c:1757 [inline] __gup_longterm_locked+0xd66/0x15b0 mm/gup.c:2523 gup_fast_fallback+0x1843/0x1d60 mm/gup.c:3417 iov_iter_extract_user_pages lib/iov_iter.c:1849 [inline] iov_iter_extract_pages+0x35a/0x5e0 lib/iov_iter.c:1912 dio_refill_pages fs/direct-io.c:172 [inline] dio_get_page fs/direct-io.c:213 [inline] do_direct_IO fs/direct-io.c:915 [inline] __blockdev_direct_IO+0x10ed/0x3310 fs/direct-io.c:1243 blockdev_direct_IO include/linux/fs.h:3422 [inline] nilfs_direct_IO+0xed/0x120 fs/nilfs2/inode.c:267 generic_file_read_iter+0x31c/0x510 mm/filemap.c:2871 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x4d0/0x980 fs/read_write.c:570 ksys_read+0x145/0x250 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 __might_fault+0xcc/0x130 mm/memory.c:7151 _copy_to_iter+0xf3/0x15a0 lib/iov_iter.c:184 copy_page_to_iter+0xa7/0x150 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:198 [inline] filemap_read+0x78d/0x11d0 mm/filemap.c:2753 blkdev_read_iter+0x30a/0x440 block/fops.c:809 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x4d0/0x980 fs/read_write.c:570 ksys_read+0x145/0x250 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&sb->s_type->i_mutex_key#8){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] set_blocksize+0x23b/0x500 block/bdev.c:203 sb_set_blocksize block/bdev.c:224 [inline] sb_min_blocksize+0x119/0x210 block/bdev.c:239 init_nilfs+0x43/0x690 fs/nilfs2/the_nilfs.c:710 nilfs_fill_super+0x8f/0x650 fs/nilfs2/super.c:1060 nilfs_get_tree+0x4f4/0x870 fs/nilfs2/super.c:1228 vfs_get_tree+0x92/0x2b0 fs/super.c:1759 do_new_mount+0x24a/0xa40 fs/namespace.c:3884 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4412 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&nilfs->ns_sem){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 nilfs_set_error fs/nilfs2/super.c:92 [inline] __nilfs_error+0x1ca/0x4b0 fs/nilfs2/super.c:141 nilfs_bmap_convert_error fs/nilfs2/bmap.c:35 [inline] nilfs_bmap_lookup_at_level+0x34e/0x3d0 fs/nilfs2/bmap.c:88 nilfs_bmap_lookup fs/nilfs2/bmap.h:182 [inline] nilfs_mdt_submit_block+0x3a3/0x830 fs/nilfs2/mdt.c:144 nilfs_mdt_read_block+0xad/0x320 fs/nilfs2/mdt.c:188 nilfs_mdt_get_block+0x11f/0xab0 fs/nilfs2/mdt.c:254 nilfs_palloc_get_block+0x18d/0x2b0 fs/nilfs2/alloc.c:239 nilfs_palloc_get_entry_block+0x8c/0xa0 fs/nilfs2/alloc.c:355 nilfs_ifile_get_inode_block+0xf0/0x190 fs/nilfs2/ifile.c:137 __nilfs_read_inode fs/nilfs2/inode.c:453 [inline] nilfs_iget+0x201/0x810 fs/nilfs2/inode.c:564 nilfs_get_root_dentry+0x28/0x230 fs/nilfs2/super.c:915 nilfs_fill_super+0x47f/0x650 fs/nilfs2/super.c:1098 nilfs_get_tree+0x4f4/0x870 fs/nilfs2/super.c:1228 vfs_get_tree+0x92/0x2b0 fs/super.c:1759 do_new_mount+0x24a/0xa40 fs/namespace.c:3884 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4412 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &nilfs->ns_sem --> mapping.invalidate_lock#9 --> &dat_lock_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&dat_lock_key); lock(mapping.invalidate_lock#9); lock(&dat_lock_key); lock(&nilfs->ns_sem); *** DEADLOCK *** 2 locks held by syz.5.2936/19905: #0: ffff88805476c0e0 (&type->s_umount_key#94/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970 fs/super.c:344 #1: ffff88807d0f2c70 (&dat_lock_key){.+.+}-{4:4}, at: __nilfs_read_inode fs/nilfs2/inode.c:452 [inline] #1: ffff88807d0f2c70 (&dat_lock_key){.+.+}-{4:4}, at: nilfs_iget+0x1ce/0x810 fs/nilfs2/inode.c:564 stack backtrace: CPU: 0 UID: 0 PID: 19905 Comm: syz.5.2936 Not tainted 6.15.0-rc4-syzkaller-00011-gf15d97df5afa #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 nilfs_set_error fs/nilfs2/super.c:92 [inline] __nilfs_error+0x1ca/0x4b0 fs/nilfs2/super.c:141 nilfs_bmap_convert_error fs/nilfs2/bmap.c:35 [inline] nilfs_bmap_lookup_at_level+0x34e/0x3d0 fs/nilfs2/bmap.c:88 nilfs_bmap_lookup fs/nilfs2/bmap.h:182 [inline] nilfs_mdt_submit_block+0x3a3/0x830 fs/nilfs2/mdt.c:144 nilfs_mdt_read_block+0xad/0x320 fs/nilfs2/mdt.c:188 nilfs_mdt_get_block+0x11f/0xab0 fs/nilfs2/mdt.c:254 nilfs_palloc_get_block+0x18d/0x2b0 fs/nilfs2/alloc.c:239 nilfs_palloc_get_entry_block+0x8c/0xa0 fs/nilfs2/alloc.c:355 nilfs_ifile_get_inode_block+0xf0/0x190 fs/nilfs2/ifile.c:137 __nilfs_read_inode fs/nilfs2/inode.c:453 [inline] nilfs_iget+0x201/0x810 fs/nilfs2/inode.c:564 nilfs_get_root_dentry+0x28/0x230 fs/nilfs2/super.c:915 nilfs_fill_super+0x47f/0x650 fs/nilfs2/super.c:1098 nilfs_get_tree+0x4f4/0x870 fs/nilfs2/super.c:1228 vfs_get_tree+0x92/0x2b0 fs/super.c:1759 do_new_mount+0x24a/0xa40 fs/namespace.c:3884 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4412 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2366d9010a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f2367bbee68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2367bbeef0 RCX: 00007f2366d9010a RDX: 0000200000000000 RSI: 0000200000000100 RDI: 00007f2367bbeeb0 RBP: 0000200000000000 R08: 00007f2367bbeef0 R09: 000000000001480c R10: 000000000001480c R11: 0000000000000246 R12: 0000200000000100 R13: 00007f2367bbeeb0 R14: 0000000000000a70 R15: 0000200000000380 Remounting filesystem read-only