EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback. ====================================================== WARNING: possible circular locking dependency detected 5.15.0-rc7-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/30404 is trying to acquire lock: ffff88802699cce8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x4d/0x420 fs/quota/dquot.c:474 but task is already holding lock: ffff888024857020 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x5e1/0x17d0 fs/ext4/inode.c:630 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->i_data_sem/2){++++}-{3:3}: down_read+0x9a/0x440 kernel/locking/rwsem.c:1464 ext4_map_blocks+0x381/0x17d0 fs/ext4/inode.c:560 ext4_getblk+0x144/0x6b0 fs/ext4/inode.c:847 ext4_bread+0x2a/0x1c0 fs/ext4/inode.c:900 ext4_quota_write+0x26d/0x690 fs/ext4/super.c:6479 write_blk+0x12e/0x220 fs/quota/quota_tree.c:64 get_free_dqblk+0x104/0x2c0 fs/quota/quota_tree.c:93 do_insert_tree+0x63a/0x11f0 fs/quota/quota_tree.c:300 do_insert_tree+0xd90/0x11f0 fs/quota/quota_tree.c:331 do_insert_tree+0xd90/0x11f0 fs/quota/quota_tree.c:331 do_insert_tree+0xd90/0x11f0 fs/quota/quota_tree.c:331 dq_insert_tree fs/quota/quota_tree.c:357 [inline] qtree_write_dquot+0x3b0/0x570 fs/quota/quota_tree.c:376 v2_write_dquot+0x11c/0x250 fs/quota/quota_v2.c:358 dquot_acquire+0x2c5/0x590 fs/quota/dquot.c:441 ext4_acquire_dquot+0x254/0x3b0 fs/ext4/super.c:6148 dqget+0x679/0x1080 fs/quota/dquot.c:899 __dquot_initialize+0x560/0xbe0 fs/quota/dquot.c:1477 ext4_setattr+0x342/0x2100 fs/ext4/inode.c:5308 notify_change+0xaef/0x10c0 fs/attr.c:410 chown_common+0x4f7/0x5b0 fs/open.c:678 do_fchownat+0x126/0x1e0 fs/open.c:709 ksys_lchown include/linux/syscalls.h:1330 [inline] __do_sys_lchown16 kernel/uid16.c:30 [inline] __se_sys_lchown16 kernel/uid16.c:28 [inline] __ia32_sys_lchown16+0xdf/0x110 kernel/uid16.c:28 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c -> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}: down_read+0x9a/0x440 kernel/locking/rwsem.c:1464 v2_read_dquot+0x49/0x120 fs/quota/quota_v2.c:332 dquot_acquire+0x12e/0x590 fs/quota/dquot.c:432 ext4_acquire_dquot+0x254/0x3b0 fs/ext4/super.c:6148 dqget+0x679/0x1080 fs/quota/dquot.c:899 __dquot_initialize+0x560/0xbe0 fs/quota/dquot.c:1477 ext4_setattr+0x342/0x2100 fs/ext4/inode.c:5308 notify_change+0xaef/0x10c0 fs/attr.c:410 chown_common+0x4f7/0x5b0 fs/open.c:678 do_fchownat+0x126/0x1e0 fs/open.c:709 ksys_lchown include/linux/syscalls.h:1330 [inline] __do_sys_lchown16 kernel/uid16.c:30 [inline] __se_sys_lchown16 kernel/uid16.c:28 [inline] __ia32_sys_lchown16+0xdf/0x110 kernel/uid16.c:28 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c -> #0 (&dquot->dq_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __mutex_lock_common kernel/locking/mutex.c:596 [inline] __mutex_lock+0x131/0x12f0 kernel/locking/mutex.c:729 dquot_commit+0x4d/0x420 fs/quota/dquot.c:474 ext4_write_dquot+0x24e/0x310 fs/ext4/super.c:6132 ext4_mark_dquot_dirty fs/ext4/super.c:6180 [inline] ext4_mark_dquot_dirty+0x111/0x1b0 fs/ext4/super.c:6174 mark_dquot_dirty fs/quota/dquot.c:345 [inline] mark_all_dquot_dirty fs/quota/dquot.c:383 [inline] __dquot_alloc_space+0x5d4/0xb60 fs/quota/dquot.c:1707 dquot_alloc_space_nodirty include/linux/quotaops.h:297 [inline] dquot_alloc_space include/linux/quotaops.h:310 [inline] dquot_alloc_block include/linux/quotaops.h:334 [inline] ext4_mb_new_blocks+0x5b3/0x5230 fs/ext4/mballoc.c:5548 ext4_ext_map_blocks+0x1fa4/0x6140 fs/ext4/extents.c:4250 ext4_map_blocks+0x653/0x17d0 fs/ext4/inode.c:637 _ext4_get_block+0x241/0x590 fs/ext4/inode.c:793 ext4_block_write_begin+0x503/0x1110 fs/ext4/inode.c:1078 ext4_write_begin+0x4be/0x14c0 fs/ext4/inode.c:1202 ext4_da_write_begin+0x5c4/0xad0 fs/ext4/inode.c:2944 generic_perform_write+0x202/0x510 mm/filemap.c:3770 ext4_buffered_write_iter+0x244/0x500 fs/ext4/file.c:269 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:680 call_write_iter include/linux/fs.h:2163 [inline] new_sync_write+0x429/0x660 fs/read_write.c:507 vfs_write+0x7cf/0xae0 fs/read_write.c:594 ksys_write+0x12d/0x250 fs/read_write.c:647 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c other info that might help us debug this: Chain exists of: &dquot->dq_lock --> &s->s_dquot.dqio_sem --> &ei->i_data_sem/2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->i_data_sem/2); lock(&s->s_dquot.dqio_sem); lock(&ei->i_data_sem/2); lock(&dquot->dq_lock); *** DEADLOCK *** 5 locks held by syz-executor.2/30404: #0: ffff888018b16670 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 #1: ffff888042cfa460 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0x12d/0x250 fs/read_write.c:647 #2: ffff888024857198 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: inode_lock include/linux/fs.h:786 [inline] #2: ffff888024857198 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: ext4_buffered_write_iter+0xb6/0x500 fs/ext4/file.c:263 #3: ffff888024857020 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x5e1/0x17d0 fs/ext4/inode.c:630 #4: ffffffff8bb3f238 (dquot_srcu){....}-{0:0}, at: i_dquot fs/quota/dquot.c:924 [inline] #4: ffffffff8bb3f238 (dquot_srcu){....}-{0:0}, at: __dquot_alloc_space+0x1b4/0xb60 fs/quota/dquot.c:1669 stack backtrace: CPU: 0 PID: 30404 Comm: syz-executor.2 Not tainted 5.15.0-rc7-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2131 check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __mutex_lock_common kernel/locking/mutex.c:596 [inline] __mutex_lock+0x131/0x12f0 kernel/locking/mutex.c:729 dquot_commit+0x4d/0x420 fs/quota/dquot.c:474 ext4_write_dquot+0x24e/0x310 fs/ext4/super.c:6132 ext4_mark_dquot_dirty fs/ext4/super.c:6180 [inline] ext4_mark_dquot_dirty+0x111/0x1b0 fs/ext4/super.c:6174 mark_dquot_dirty fs/quota/dquot.c:345 [inline] mark_all_dquot_dirty fs/quota/dquot.c:383 [inline] __dquot_alloc_space+0x5d4/0xb60 fs/quota/dquot.c:1707 dquot_alloc_space_nodirty include/linux/quotaops.h:297 [inline] dquot_alloc_space include/linux/quotaops.h:310 [inline] dquot_alloc_block include/linux/quotaops.h:334 [inline] ext4_mb_new_blocks+0x5b3/0x5230 fs/ext4/mballoc.c:5548 ext4_ext_map_blocks+0x1fa4/0x6140 fs/ext4/extents.c:4250 ext4_map_blocks+0x653/0x17d0 fs/ext4/inode.c:637 _ext4_get_block+0x241/0x590 fs/ext4/inode.c:793 ext4_block_write_begin+0x503/0x1110 fs/ext4/inode.c:1078 ext4_write_begin+0x4be/0x14c0 fs/ext4/inode.c:1202 ext4_da_write_begin+0x5c4/0xad0 fs/ext4/inode.c:2944 generic_perform_write+0x202/0x510 mm/filemap.c:3770 ext4_buffered_write_iter+0x244/0x500 fs/ext4/file.c:269 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:680 call_write_iter include/linux/fs.h:2163 [inline] new_sync_write+0x429/0x660 fs/read_write.c:507 vfs_write+0x7cf/0xae0 fs/read_write.c:594 ksys_write+0x12d/0x250 fs/read_write.c:647 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6f02549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f44fc5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200009c0 RDX: 000000000d4ba0ff RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d a: 10 06 adc %al,(%rsi) c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 10: 10 07 adc %al,(%rdi) 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi 16: 10 08 adc %cl,(%rax) 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1c: 00 00 add %al,(%rax) 1e: 00 00 add %al,(%rax) 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 retq 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi