====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 Not tainted ------------------------------------------------------ syz.0.182/7312 is trying to acquire lock: ffff88805febd470 (&dat_lock_key){.+.+}-{4:4}, at: nilfs_get_block+0x1b1/0x8f0 fs/nilfs2/inode.c:83 but task is already holding lock: ffff88802590d2a0 (&nilfs->ns_segctor_sem){++++}-{4:4}, at: nilfs_transaction_begin+0x365/0x710 fs/nilfs2/segment.c:221 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #7 (&nilfs->ns_segctor_sem){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1524 nilfs_transaction_begin+0x365/0x710 fs/nilfs2/segment.c:221 nilfs_page_mkwrite+0x8b0/0xc20 fs/nilfs2/file.c:95 do_page_mkwrite+0x14a/0x310 mm/memory.c:3287 wp_page_shared mm/memory.c:3688 [inline] do_wp_page+0x2626/0x5760 mm/memory.c:3907 handle_pte_fault mm/memory.c:6013 [inline] __handle_mm_fault+0x1028/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #6 (sb_internal#7){.+.+}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 percpu_down_read include/linux/percpu-rwsem.h:52 [inline] __sb_start_write include/linux/fs.h:1783 [inline] sb_start_intwrite include/linux/fs.h:1966 [inline] nilfs_transaction_begin+0x268/0x710 fs/nilfs2/segment.c:218 nilfs_page_mkwrite+0x8b0/0xc20 fs/nilfs2/file.c:95 do_page_mkwrite+0x14a/0x310 mm/memory.c:3287 wp_page_shared mm/memory.c:3688 [inline] do_wp_page+0x2626/0x5760 mm/memory.c:3907 handle_pte_fault mm/memory.c:6013 [inline] __handle_mm_fault+0x1028/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #5 (sb_pagefaults#3){.+.+}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 percpu_down_read include/linux/percpu-rwsem.h:52 [inline] __sb_start_write include/linux/fs.h:1783 [inline] sb_start_pagefault include/linux/fs.h:1948 [inline] nilfs_page_mkwrite+0x21e/0xc20 fs/nilfs2/file.c:57 do_page_mkwrite+0x14a/0x310 mm/memory.c:3287 wp_page_shared mm/memory.c:3688 [inline] do_wp_page+0x2626/0x5760 mm/memory.c:3907 handle_pte_fault mm/memory.c:6013 [inline] __handle_mm_fault+0x1028/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #4 (vm_lock){++++}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 __vma_enter_locked+0x182/0x380 mm/memory.c:6473 __vma_start_write+0x1e/0x120 mm/memory.c:6497 vma_start_write include/linux/mm.h:829 [inline] mprotect_fixup+0x571/0x9b0 mm/mprotect.c:670 setup_arg_pages+0x53a/0xaa0 fs/exec.c:780 load_elf_binary+0xb7a/0x27b0 fs/binfmt_elf.c:1019 search_binary_handler fs/exec.c:1778 [inline] exec_binprm fs/exec.c:1810 [inline] bprm_execve+0x999/0x1440 fs/exec.c:1862 kernel_execve+0x8f0/0x9f0 fs/exec.c:2028 try_to_run_init_process+0x13/0x60 init/main.c:1385 kernel_init+0xad/0x1d0 init/main.c:1513 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #3 (&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+0x4cd/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 (&sb->s_type->i_mutex_key#7){++++}-{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+0x8f/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 -> #1 (&nilfs->ns_sem){++++}-{4:4}: 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_contig+0x13e/0x160 fs/nilfs2/bmap.c:100 nilfs_get_block+0x1fb/0x8f0 fs/nilfs2/inode.c:84 do_mpage_readpage+0x86d/0x19a0 fs/mpage.c:222 mpage_readahead+0x398/0x650 fs/mpage.c:371 read_pages+0x177/0x590 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+0x469/0x8c0 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 -> #0 (&dat_lock_key){.+.+}-{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_read+0x46/0x2e0 kernel/locking/rwsem.c:1524 nilfs_get_block+0x1b1/0x8f0 fs/nilfs2/inode.c:83 __block_write_begin_int+0x6b2/0x1900 fs/buffer.c:2151 block_page_mkwrite+0x34f/0x4d0 fs/buffer.c:2646 nilfs_page_mkwrite+0x8fd/0xc20 fs/nilfs2/file.c:101 do_page_mkwrite+0x14a/0x310 mm/memory.c:3287 wp_page_shared mm/memory.c:3688 [inline] do_wp_page+0x2626/0x5760 mm/memory.c:3907 handle_pte_fault mm/memory.c:6013 [inline] __handle_mm_fault+0x1028/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 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: &dat_lock_key --> sb_internal#7 --> &nilfs->ns_segctor_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&nilfs->ns_segctor_sem); lock(sb_internal#7); lock(&nilfs->ns_segctor_sem); rlock(&dat_lock_key); *** DEADLOCK *** 4 locks held by syz.0.182/7312: #0: ffff888048b99448 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x2d9/0x1390 arch/x86/mm/fault.c:1328 #1: ffff88805b92c518 (sb_pagefaults#3){.+.+}-{0:0}, at: do_page_mkwrite+0x14a/0x310 mm/memory.c:3287 #2: ffff88805b92c610 (sb_internal#7){.+.+}-{0:0}, at: nilfs_page_mkwrite+0x8b0/0xc20 fs/nilfs2/file.c:95 #3: ffff88802590d2a0 (&nilfs->ns_segctor_sem){++++}-{4:4}, at: nilfs_transaction_begin+0x365/0x710 fs/nilfs2/segment.c:221 stack backtrace: CPU: 1 UID: 0 PID: 7312 Comm: syz.0.182 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_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_read+0x46/0x2e0 kernel/locking/rwsem.c:1524 nilfs_get_block+0x1b1/0x8f0 fs/nilfs2/inode.c:83 __block_write_begin_int+0x6b2/0x1900 fs/buffer.c:2151 block_page_mkwrite+0x34f/0x4d0 fs/buffer.c:2646 nilfs_page_mkwrite+0x8fd/0xc20 fs/nilfs2/file.c:101 do_page_mkwrite+0x14a/0x310 mm/memory.c:3287 wp_page_shared mm/memory.c:3688 [inline] do_wp_page+0x2626/0x5760 mm/memory.c:3907 handle_pte_fault mm/memory.c:6013 [inline] __handle_mm_fault+0x1028/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f4d933566d8 Code: fc 89 37 c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 fa 7f 4c 17 f0 c3 66 0f 1f 84 00 00 00 00 00 48 8b 4c 16 f8 48 8b 36 <48> 89 37 48 89 4c 17 f8 c3 c5 fe 6f 54 16 e0 c5 fe 6f 5c 16 c0 c5 RSP: 002b:00007ffe6dc58b18 EFLAGS: 00010202 RAX: 0000200000000040 RBX: 0000000000000004 RCX: 0030626c6c756e2f RDX: 000000000000000c RSI: 6c756e2f7665642f RDI: 0000200000000040 RBP: 00007f4d935b7ba0 R08: 00007f4d93200000 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000009 R12: 00007f4d935b5fac R13: 00007f4d935b5fa0 R14: fffffffffffffffe R15: 00007ffe6dc58c30