====================================================== WARNING: possible circular locking dependency detected 6.7.0-rc6-syzkaller-gaafe7ad77b91 #0 Not tainted ------------------------------------------------------ syz-executor.5/11081 is trying to acquire lock: ffff0000d105f0f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x90/0x818 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff0000c7cddf88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1d0/0x1544 fs/hfsplus/extents.c:457 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 hfsplus_get_block+0x2c4/0x1168 fs/hfsplus/extents.c:260 block_read_full_folio+0x430/0xcdc fs/buffer.c:2399 hfsplus_read_folio+0x28/0x38 fs/hfsplus/inode.c:28 filemap_read_folio+0x14c/0x39c mm/filemap.c:2323 do_read_cache_folio+0x114/0x548 mm/filemap.c:3691 do_read_cache_page mm/filemap.c:3757 [inline] read_cache_page+0x6c/0x15c mm/filemap.c:3766 read_mapping_page include/linux/pagemap.h:871 [inline] hfsplus_block_allocate+0xe0/0x818 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0x7b4/0x1544 fs/hfsplus/extents.c:468 hfsplus_get_block+0x398/0x1168 fs/hfsplus/extents.c:245 __block_write_begin_int+0x3f0/0x1504 fs/buffer.c:2119 __block_write_begin fs/buffer.c:2168 [inline] block_write_begin fs/buffer.c:2227 [inline] cont_write_begin+0x798/0xc38 fs/buffer.c:2582 hfsplus_write_begin+0x98/0xe4 fs/hfsplus/inode.c:52 generic_perform_write+0x28c/0x588 mm/filemap.c:3918 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4013 generic_file_write_iter+0xb8/0x2b4 mm/filemap.c:4039 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x610/0x910 fs/read_write.c:584 ksys_write+0x15c/0x26c fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 -> #0 (&sbi->alloc_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 hfsplus_block_allocate+0x90/0x818 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0x7b4/0x1544 fs/hfsplus/extents.c:468 hfsplus_get_block+0x398/0x1168 fs/hfsplus/extents.c:245 __block_write_begin_int+0x3f0/0x1504 fs/buffer.c:2119 __block_write_begin fs/buffer.c:2168 [inline] block_write_begin fs/buffer.c:2227 [inline] cont_write_begin+0x798/0xc38 fs/buffer.c:2582 hfsplus_write_begin+0x98/0xe4 fs/hfsplus/inode.c:52 cont_expand_zero fs/buffer.c:2542 [inline] cont_write_begin+0x868/0xc38 fs/buffer.c:2572 hfsplus_write_begin+0x98/0xe4 fs/hfsplus/inode.c:52 generic_cont_expand_simple+0x160/0x258 fs/buffer.c:2473 hfsplus_setattr+0x148/0x244 fs/hfsplus/inode.c:263 notify_change+0x9d4/0xc8c fs/attr.c:499 do_truncate+0x1c0/0x28c fs/open.c:66 vfs_truncate+0x2b8/0x360 fs/open.c:112 do_sys_truncate+0xec/0x1b4 fs/open.c:135 __do_sys_truncate fs/open.c:147 [inline] __se_sys_truncate fs/open.c:145 [inline] __arm64_sys_truncate+0x5c/0x70 fs/open.c:145 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); *** DEADLOCK *** 3 locks held by syz-executor.5/11081: #0: ffff0000d7ac0418 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:404 #1: ffff0000c7cde180 (&sb->s_type->i_mutex_key#19){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #1: ffff0000c7cde180 (&sb->s_type->i_mutex_key#19){+.+.}-{3:3}, at: do_truncate+0x1ac/0x28c fs/open.c:64 #2: ffff0000c7cddf88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1d0/0x1544 fs/hfsplus/extents.c:457 stack backtrace: CPU: 0 PID: 11081 Comm: syz-executor.5 Not tainted 6.7.0-rc6-syzkaller-gaafe7ad77b91 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 hfsplus_block_allocate+0x90/0x818 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0x7b4/0x1544 fs/hfsplus/extents.c:468 hfsplus_get_block+0x398/0x1168 fs/hfsplus/extents.c:245 __block_write_begin_int+0x3f0/0x1504 fs/buffer.c:2119 __block_write_begin fs/buffer.c:2168 [inline] block_write_begin fs/buffer.c:2227 [inline] cont_write_begin+0x798/0xc38 fs/buffer.c:2582 hfsplus_write_begin+0x98/0xe4 fs/hfsplus/inode.c:52 cont_expand_zero fs/buffer.c:2542 [inline] cont_write_begin+0x868/0xc38 fs/buffer.c:2572 hfsplus_write_begin+0x98/0xe4 fs/hfsplus/inode.c:52 generic_cont_expand_simple+0x160/0x258 fs/buffer.c:2473 hfsplus_setattr+0x148/0x244 fs/hfsplus/inode.c:263 notify_change+0x9d4/0xc8c fs/attr.c:499 do_truncate+0x1c0/0x28c fs/open.c:66 vfs_truncate+0x2b8/0x360 fs/open.c:112 do_sys_truncate+0xec/0x1b4 fs/open.c:135 __do_sys_truncate fs/open.c:147 [inline] __se_sys_truncate fs/open.c:145 [inline] __arm64_sys_truncate+0x5c/0x70 fs/open.c:145 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595