netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. loop4: detected capacity change from 0 to 1024 EXT4-fs (loop4): mounted filesystem without journal. Quota mode: writeback. ====================================================== WARNING: possible circular locking dependency detected 5.16.0-rc6-next-20211224 #1 Not tainted ------------------------------------------------------ syz-executor.4/12529 is trying to acquire lock: ffff8880331a20a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x4d/0x380 fs/quota/dquot.c:474 but task is already holding lock: ffff888033060c48 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x74e/0x1330 fs/ext4/inode.c:4203 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+0x98/0x440 kernel/locking/rwsem.c:1461 ext4_map_blocks+0x380/0x18d0 fs/ext4/inode.c:561 ext4_getblk+0x144/0x6b0 fs/ext4/inode.c:848 ext4_bread+0x2a/0x1c0 fs/ext4/inode.c:901 ext4_quota_write+0x237/0x640 fs/ext4/super.c:6976 write_blk+0x10c/0x200 fs/quota/quota_tree.c:64 get_free_dqblk+0x104/0x2c0 fs/quota/quota_tree.c:93 do_insert_tree+0x63a/0x11d0 fs/quota/quota_tree.c:300 do_insert_tree+0xd71/0x11d0 fs/quota/quota_tree.c:331 do_insert_tree+0x6fd/0x11d0 fs/quota/quota_tree.c:331 do_insert_tree+0x6fd/0x11d0 fs/quota/quota_tree.c:331 dq_insert_tree fs/quota/quota_tree.c:357 [inline] qtree_write_dquot+0x3b8/0x580 fs/quota/quota_tree.c:376 v2_write_dquot+0x11c/0x250 fs/quota/quota_v2.c:358 dquot_acquire+0x2cf/0x570 fs/quota/dquot.c:441 ext4_acquire_dquot+0x240/0x340 fs/ext4/super.c:6645 dqget+0x623/0xf10 fs/quota/dquot.c:899 __dquot_initialize+0x3c3/0xb80 fs/quota/dquot.c:1477 ext4_setattr+0x279/0x20e0 fs/ext4/inode.c:5326 notify_change+0xb79/0x1260 fs/attr.c:410 do_truncate+0x13c/0x200 fs/open.c:65 handle_truncate fs/namei.c:3132 [inline] do_open fs/namei.c:3480 [inline] path_openat+0x1d23/0x28a0 fs/namei.c:3609 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4d0 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}: down_read+0x98/0x440 kernel/locking/rwsem.c:1461 v2_read_dquot+0x49/0x120 fs/quota/quota_v2.c:332 dquot_acquire+0x133/0x570 fs/quota/dquot.c:432 ext4_acquire_dquot+0x240/0x340 fs/ext4/super.c:6645 dqget+0x623/0xf10 fs/quota/dquot.c:899 __dquot_initialize+0x3c3/0xb80 fs/quota/dquot.c:1477 ext4_setattr+0x279/0x20e0 fs/ext4/inode.c:5326 notify_change+0xb79/0x1260 fs/attr.c:410 do_truncate+0x13c/0x200 fs/open.c:65 handle_truncate fs/namei.c:3132 [inline] do_open fs/namei.c:3480 [inline] path_openat+0x1d23/0x28a0 fs/namei.c:3609 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4d0 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #0 (&dquot->dq_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3063 [inline] check_prevs_add kernel/locking/lockdep.c:3186 [inline] validate_chain kernel/locking/lockdep.c:3801 [inline] __lock_acquire+0x2a14/0x5b70 kernel/locking/lockdep.c:5027 lock_acquire kernel/locking/lockdep.c:5639 [inline] lock_acquire+0x1a2/0x4d0 kernel/locking/lockdep.c:5604 __mutex_lock_common kernel/locking/mutex.c:600 [inline] __mutex_lock+0x136/0x1480 kernel/locking/mutex.c:733 dquot_commit+0x4d/0x380 fs/quota/dquot.c:474 ext4_write_dquot+0x243/0x2f0 fs/ext4/super.c:6629 ext4_mark_dquot_dirty fs/ext4/super.c:6677 [inline] ext4_mark_dquot_dirty+0x111/0x1b0 fs/ext4/super.c:6671 mark_dquot_dirty fs/quota/dquot.c:345 [inline] mark_all_dquot_dirty fs/quota/dquot.c:383 [inline] __dquot_free_space+0x739/0xa60 fs/quota/dquot.c:1892 dquot_free_space_nodirty include/linux/quotaops.h:376 [inline] dquot_free_space include/linux/quotaops.h:381 [inline] dquot_free_block include/linux/quotaops.h:392 [inline] ext4_free_blocks+0x1ada/0x2170 fs/ext4/mballoc.c:6084 ext4_remove_blocks fs/ext4/extents.c:2523 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2707 [inline] ext4_ext_remove_space+0x3087/0x40e0 fs/ext4/extents.c:2955 ext4_ext_truncate+0x324/0x3e0 fs/ext4/extents.c:4416 ext4_truncate+0xddb/0x1330 fs/ext4/inode.c:4208 ext4_setattr+0x13c3/0x20e0 fs/ext4/inode.c:5481 notify_change+0xb79/0x1260 fs/attr.c:410 do_truncate+0x13c/0x200 fs/open.c:65 handle_truncate fs/namei.c:3132 [inline] do_open fs/namei.c:3480 [inline] path_openat+0x1d23/0x28a0 fs/namei.c:3609 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4d0 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae 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.4/12529: #0: ffff88801e88e438 (sb_writers#3){.+.+}-{0:0}, at: do_open fs/namei.c:3469 [inline] #0: ffff88801e88e438 (sb_writers#3){.+.+}-{0:0}, at: path_openat+0x1b42/0x28a0 fs/namei.c:3609 #1: ffff888033060dc0 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: inode_lock include/linux/fs.h:777 [inline] #1: ffff888033060dc0 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: do_truncate+0x12a/0x200 fs/open.c:63 #2: ffff888033060f50 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:822 [inline] #2: ffff888033060f50 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_setattr+0xcb4/0x20e0 fs/ext4/inode.c:5406 #3: ffff888033060c48 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x74e/0x1330 fs/ext4/inode.c:4203 #4: ffffffff852ecb40 (dquot_srcu){....}-{0:0}, at: i_dquot fs/quota/dquot.c:924 [inline] #4: ffffffff852ecb40 (dquot_srcu){....}-{0:0}, at: __dquot_free_space+0x190/0xa60 fs/quota/dquot.c:1865 stack backtrace: CPU: 1 PID: 12529 Comm: syz-executor.4 Not tainted 5.16.0-rc6-next-20211224 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2143 check_prev_add kernel/locking/lockdep.c:3063 [inline] check_prevs_add kernel/locking/lockdep.c:3186 [inline] validate_chain kernel/locking/lockdep.c:3801 [inline] __lock_acquire+0x2a14/0x5b70 kernel/locking/lockdep.c:5027 lock_acquire kernel/locking/lockdep.c:5639 [inline] lock_acquire+0x1a2/0x4d0 kernel/locking/lockdep.c:5604 __mutex_lock_common kernel/locking/mutex.c:600 [inline] __mutex_lock+0x136/0x1480 kernel/locking/mutex.c:733 dquot_commit+0x4d/0x380 fs/quota/dquot.c:474 ext4_write_dquot+0x243/0x2f0 fs/ext4/super.c:6629 ext4_mark_dquot_dirty fs/ext4/super.c:6677 [inline] ext4_mark_dquot_dirty+0x111/0x1b0 fs/ext4/super.c:6671 mark_dquot_dirty fs/quota/dquot.c:345 [inline] mark_all_dquot_dirty fs/quota/dquot.c:383 [inline] __dquot_free_space+0x739/0xa60 fs/quota/dquot.c:1892 dquot_free_space_nodirty include/linux/quotaops.h:376 [inline] dquot_free_space include/linux/quotaops.h:381 [inline] dquot_free_block include/linux/quotaops.h:392 [inline] ext4_free_blocks+0x1ada/0x2170 fs/ext4/mballoc.c:6084 ext4_remove_blocks fs/ext4/extents.c:2523 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2707 [inline] ext4_ext_remove_space+0x3087/0x40e0 fs/ext4/extents.c:2955 ext4_ext_truncate+0x324/0x3e0 fs/ext4/extents.c:4416 ext4_truncate+0xddb/0x1330 fs/ext4/inode.c:4208 ext4_setattr+0x13c3/0x20e0 fs/ext4/inode.c:5481 notify_change+0xb79/0x1260 fs/attr.c:410 do_truncate+0x13c/0x200 fs/open.c:65 handle_truncate fs/namei.c:3132 [inline] do_open fs/namei.c:3480 [inline] path_openat+0x1d23/0x28a0 fs/namei.c:3609 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4d0 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6e5207eb19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6e4f5f4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f6e52191f60 RCX: 00007f6e5207eb19 RDX: 0000000000000a00 RSI: 00000000200001c0 RDI: 0000000000000005 RBP: 00007f6e520d8f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc21ecc80f R14: 00007f6e4f5f4300 R15: 0000000000022000 I/O error, dev loop6, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0 I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0