NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16) ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 Not tainted ------------------------------------------------------ syz.1.766/8487 is trying to acquire lock: ffff88804f057090 (&nilfs->ns_sem){++++}-{4:4}, at: nilfs_set_error fs/nilfs2/super.c:92 [inline] ffff88804f057090 (&nilfs->ns_sem){++++}-{4:4}, at: __nilfs_error+0x232/0x4d0 fs/nilfs2/super.c:141 but task is already holding lock: ffff88814d8f5070 (&dat_lock_key){.+.+}-{4:4}, at: nilfs_get_block+0x1b0/0xa90 fs/nilfs2/inode.c:83 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&dat_lock_key){.+.+}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1524 nilfs_get_block+0x1b0/0xa90 fs/nilfs2/inode.c:83 do_mpage_readpage+0x71e/0x19b0 fs/mpage.c:222 mpage_readahead+0x343/0x590 fs/mpage.c:371 read_pages+0x1c4/0xc70 mm/readahead.c:160 page_cache_ra_unbounded+0x421/0x7d0 mm/readahead.c:297 do_page_cache_ra mm/readahead.c:327 [inline] page_cache_ra_order+0x9c8/0xd00 mm/readahead.c:532 page_cache_sync_ra+0x4b4/0x9c0 mm/readahead.c:621 filemap_get_pages+0xb62/0x1c20 mm/filemap.c:2591 filemap_read+0x3d2/0xe90 mm/filemap.c:2702 generic_file_read_iter+0x344/0x450 mm/filemap.c:2894 __kernel_read+0x3f3/0xb60 fs/read_write.c:528 integrity_kernel_read+0x7e/0xb0 security/integrity/iint.c:28 ima_calc_file_hash_tfm+0x2c7/0x3d0 security/integrity/ima/ima_crypto.c:480 ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0x1ba/0x490 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x897/0xa40 security/integrity/ima/ima_api.c:293 process_measurement+0x11fa/0x23e0 security/integrity/ima/ima_main.c:385 ima_file_check+0xc5/0x110 security/integrity/ima/ima_main.c:613 security_file_post_open+0x8e/0x210 security/security.c:3130 do_open fs/namei.c:3882 [inline] path_openat+0x147d/0x2d40 fs/namei.c:4039 do_filp_open+0x20b/0x470 fs/namei.c:4066 do_sys_openat2+0x11b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_open fs/open.c:1452 [inline] __se_sys_open fs/open.c:1448 [inline] __x64_sys_open+0x153/0x1e0 fs/open.c:1448 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (mapping.invalidate_lock#3){.+.+}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] filemap_fault+0x2d8/0x2740 mm/filemap.c:3391 __do_fault+0x10d/0x490 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing+0x1031/0x3fb0 mm/memory.c:4160 handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] _inline_copy_from_user include/linux/uaccess.h:178 [inline] _copy_from_user+0x93/0xd0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] ioctl_fiemap fs/ioctl.c:210 [inline] do_vfs_ioctl+0x343/0x1990 fs/ioctl.c:840 __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x11d/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&mm->mmap_lock){++++}-{4:4}: __might_fault mm/memory.c:7151 [inline] __might_fault+0x113/0x190 mm/memory.c:7145 _copy_to_iter+0x1c6/0x15a0 lib/iov_iter.c:184 copy_page_to_iter lib/iov_iter.c:362 [inline] copy_page_to_iter+0xf1/0x180 lib/iov_iter.c:349 copy_folio_to_iter include/linux/uio.h:198 [inline] filemap_read+0x6b1/0xe90 mm/filemap.c:2753 blkdev_read_iter+0x1ac/0x500 block/fops.c:809 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x8cb/0xc70 fs/read_write.c:570 ksys_read+0x12a/0x240 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&sb->s_type->i_mutex_key#8){++++}-{4:4}: down_write+0x92/0x200 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] set_blocksize+0x1e0/0x500 block/bdev.c:203 sb_set_blocksize block/bdev.c:224 [inline] sb_min_blocksize+0x149/0x270 block/bdev.c:239 init_nilfs+0x94/0x15a0 fs/nilfs2/the_nilfs.c:710 nilfs_fill_super fs/nilfs2/super.c:1060 [inline] nilfs_get_tree+0x654/0x10f0 fs/nilfs2/super.c:1228 vfs_get_tree+0x8e/0x340 fs/super.c:1759 do_new_mount fs/namespace.c:3884 [inline] path_mount+0x14d4/0x1f20 fs/namespace.c:4211 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount fs/namespace.c:4412 [inline] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4412 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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 kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 down_write+0x92/0x200 kernel/locking/rwsem.c:1577 nilfs_set_error fs/nilfs2/super.c:92 [inline] __nilfs_error+0x232/0x4d0 fs/nilfs2/super.c:141 nilfs_bmap_convert_error fs/nilfs2/bmap.c:35 [inline] nilfs_bmap_lookup_contig+0x145/0x180 fs/nilfs2/bmap.c:100 nilfs_get_block+0x1ee/0xa90 fs/nilfs2/inode.c:84 do_mpage_readpage+0x71e/0x19b0 fs/mpage.c:222 mpage_readahead+0x343/0x590 fs/mpage.c:371 read_pages+0x1c4/0xc70 mm/readahead.c:160 page_cache_ra_unbounded+0x421/0x7d0 mm/readahead.c:297 do_page_cache_ra mm/readahead.c:327 [inline] page_cache_ra_order+0x9c8/0xd00 mm/readahead.c:532 do_sync_mmap_readahead mm/filemap.c:3262 [inline] filemap_fault+0x147c/0x2740 mm/filemap.c:3403 __do_fault+0x10d/0x490 mm/memory.c:5098 do_shared_fault mm/memory.c:5582 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing+0x1a6/0x3fb0 mm/memory.c:4160 handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 other info that might help us debug this: Chain exists of: &nilfs->ns_sem --> mapping.invalidate_lock#3 --> &dat_lock_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&dat_lock_key); lock(mapping.invalidate_lock#3); lock(&dat_lock_key); lock(&nilfs->ns_sem); *** DEADLOCK *** 2 locks held by syz.1.766/8487: #0: ffff88807a233740 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] #0: ffff88807a233740 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x173/0x7d0 mm/readahead.c:228 #1: ffff88814d8f5070 (&dat_lock_key){.+.+}-{4:4}, at: nilfs_get_block+0x1b0/0xa90 fs/nilfs2/inode.c:83 stack backtrace: CPU: 1 UID: 0 PID: 8487 Comm: syz.1.766 Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079 check_noncircular+0x14c/0x170 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 kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 down_write+0x92/0x200 kernel/locking/rwsem.c:1577 nilfs_set_error fs/nilfs2/super.c:92 [inline] __nilfs_error+0x232/0x4d0 fs/nilfs2/super.c:141 nilfs_bmap_convert_error fs/nilfs2/bmap.c:35 [inline] nilfs_bmap_lookup_contig+0x145/0x180 fs/nilfs2/bmap.c:100 nilfs_get_block+0x1ee/0xa90 fs/nilfs2/inode.c:84 do_mpage_readpage+0x71e/0x19b0 fs/mpage.c:222 mpage_readahead+0x343/0x590 fs/mpage.c:371 read_pages+0x1c4/0xc70 mm/readahead.c:160 page_cache_ra_unbounded+0x421/0x7d0 mm/readahead.c:297 do_page_cache_ra mm/readahead.c:327 [inline] page_cache_ra_order+0x9c8/0xd00 mm/readahead.c:532 do_sync_mmap_readahead mm/filemap.c:3262 [inline] filemap_fault+0x147c/0x2740 mm/filemap.c:3403 __do_fault+0x10d/0x490 mm/memory.c:5098 do_shared_fault mm/memory.c:5582 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing+0x1a6/0x3fb0 mm/memory.c:4160 handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f19f1555f0d Code: 7f 4c 17 e0 c5 f8 77 c3 0f 1f 44 00 00 83 fa 10 73 2d 83 fa 08 73 46 83 fa 04 73 16 83 fa 01 7c 10 8a 0e 74 0a 0f b7 74 16 fe <66> 89 74 17 fe 88 0f c3 8b 4c 16 fc 8b 36 89 4c 17 fc 89 37 c3 c5 RSP: 002b:00007ffed91284c8 EFLAGS: 00010202 RAX: 0000200000000000 RBX: 0000000000000004 RCX: 800000000000002e RDX: 0000000000000002 RSI: 000000000000002e RDI: 0000200000000000 RBP: 00007f19f17b7ba0 R08: 00007f19f1400000 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000009 R12: 00007f19f17b5fac R13: 00007f19f17b5fa0 R14: fffffffffffffffe R15: 00007ffed91285e0 Remounting filesystem read-only NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16) NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16) NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)