============================================ WARNING: possible recursive locking detected 4.19.211-syzkaller #0 Not tainted -------------------------------------------- syz-executor857/8061 is trying to acquire lock: 000000005b63b3cf (&HFSPLUS_I(inode)->extents_lock){+.+.}, at: hfsplus_get_block+0x292/0x960 fs/hfsplus/extents.c:260 but task is already holding lock: 00000000e4194eba (&HFSPLUS_I(inode)->extents_lock){+.+.}, at: hfsplus_file_extend+0x1bb/0xf40 fs/hfsplus/extents.c:457 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&HFSPLUS_I(inode)->extents_lock); lock(&HFSPLUS_I(inode)->extents_lock); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by syz-executor857/8061: #0: 000000003d5471c5 (sb_writers#11){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 000000003d5471c5 (sb_writers#11){.+.+}, at: vfs_writev+0x259/0x2e0 fs/read_write.c:1004 #1: 0000000075dddad3 (&sb->s_type->i_mutex_key#17){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 0000000075dddad3 (&sb->s_type->i_mutex_key#17){+.+.}, at: generic_file_write_iter+0x99/0x730 mm/filemap.c:3320 #2: 00000000e4194eba (&HFSPLUS_I(inode)->extents_lock){+.+.}, at: hfsplus_file_extend+0x1bb/0xf40 fs/hfsplus/extents.c:457 #3: 00000000138ca128 (&sbi->alloc_mutex){+.+.}, at: hfsplus_block_allocate+0xe0/0xa60 fs/hfsplus/bitmap.c:35 stack backtrace: CPU: 0 PID: 8061 Comm: syz-executor857 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_deadlock_bug kernel/locking/lockdep.c:1764 [inline] check_deadlock kernel/locking/lockdep.c:1808 [inline] validate_chain kernel/locking/lockdep.c:2404 [inline] __lock_acquire.cold+0x121/0x57e kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 hfsplus_get_block+0x292/0x960 fs/hfsplus/extents.c:260 block_read_full_page+0x288/0xd10 fs/buffer.c:2259 do_read_cache_page+0x533/0x1170 mm/filemap.c:2828 read_mapping_page include/linux/pagemap.h:402 [inline] hfsplus_block_allocate+0x197/0xa60 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0x436/0xf40 fs/hfsplus/extents.c:468 hfsplus_get_block+0x196/0x960 fs/hfsplus/extents.c:245 __block_write_begin_int+0x46c/0x17b0 fs/buffer.c:1978 __block_write_begin fs/buffer.c:2028 [inline] block_write_begin+0x58/0x2e0 fs/buffer.c:2087 cont_write_begin+0x55a/0x820 fs/buffer.c:2440 hfsplus_write_begin+0x87/0x150 fs/hfsplus/inode.c:52 cont_expand_zero fs/buffer.c:2367 [inline] cont_write_begin+0x2ee/0x820 fs/buffer.c:2430 hfsplus_write_begin+0x87/0x150 fs/hfsplus/inode.c:52 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3170 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295 generic_file_write_iter+0x3f8/0x730 mm/filemap.c:3323 call_write_iter include/linux/fs.h:1821 [inline] do_iter_readv_writev+0x668/0x790 fs/read_write.c:681 do_iter_write+0x182/0x5d0 fs/read_write.c:960 vfs_writev+0x153/0x2e0 fs/read_write.c:1005 do_pwritev+0x1b6/0x270 fs/read_write.c:1094 __do_sys_pwritev2 fs/read_write.c:1153 [inline] __se_sys_pwritev2 fs/read_write.c:1144 [inline] __x64_sys_pwritev2+0xeb/0x150 fs/read_write.c:1144 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0c5218dad9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd128b1388 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0c5218dad9 RDX: 0000000000000001 RSI: 0000000020000200 RDI: 0000000000000004 RBP: 00007f0c5214d0e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000005405 R11: 0000000000000246 R12: 00007f0c5214d170 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 hfsplus: request for non-existent node 31668 in B*Tree hfsplus: request for non-existent node 31668 in B*Tree hfsplus: request for non-existent node 31668 in B*Tree hfsplus: request for non-existent node 31668 in B*Tree hfsplus: request for non-existent node 31668 in B*Tree hfsplus: request for non-existent node 31668 in B*Tree hfsplus: request for non-existent node 31668 in B*Tree hfsplus: request for non-existent node 316