====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/32491 is trying to acquire lock: 00000000fa77a8b3 (&dquot->dq_lock){+.+.}, at: dquot_commit+0x4d/0x400 fs/quota/dquot.c:469 but task is already holding lock: 000000009e2f9284 (&ei->i_data_sem/2){++++}, at: ext4_map_blocks+0x740/0x1a50 fs/ext4/inode.c:650 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->i_data_sem/2){++++}: ext4_map_blocks+0x740/0x1a50 fs/ext4/inode.c:650 ext4_getblk+0xad/0x4f0 fs/ext4/inode.c:993 ext4_bread+0x7c/0x210 fs/ext4/inode.c:1043 ext4_quota_write+0x205/0x530 fs/ext4/super.c:6008 write_blk+0x10a/0x200 fs/quota/quota_tree.c:72 find_free_dqentry fs/quota/quota_tree.c:280 [inline] do_insert_tree+0x9c1/0x1150 fs/quota/quota_tree.c:337 do_insert_tree+0x85b/0x1150 fs/quota/quota_tree.c:339 do_insert_tree+0x85b/0x1150 fs/quota/quota_tree.c:339 do_insert_tree+0x85b/0x1150 fs/quota/quota_tree.c:339 dq_insert_tree fs/quota/quota_tree.c:365 [inline] qtree_write_dquot+0x1cb/0x570 fs/quota/quota_tree.c:384 v2_write_dquot+0x11c/0x250 fs/quota/quota_v2.c:359 dquot_acquire+0x25c/0x490 fs/quota/dquot.c:436 ext4_acquire_dquot+0x1e7/0x2d0 fs/ext4/super.c:5666 dqget+0x785/0xfc0 fs/quota/dquot.c:896 __dquot_initialize+0x3bd/0xb70 fs/quota/dquot.c:1470 dquot_initialize fs/quota/dquot.c:1528 [inline] dquot_file_open fs/quota/dquot.c:2154 [inline] dquot_file_open+0x8c/0xb0 fs/quota/dquot.c:2148 ext4_file_open fs/ext4/file.c:471 [inline] ext4_file_open+0x20e/0x600 fs/ext4/file.c:445 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&s->s_dquot.dqio_sem){++++}: v2_read_dquot+0x49/0x120 fs/quota/quota_v2.c:333 dquot_acquire+0x121/0x490 fs/quota/dquot.c:428 ext4_acquire_dquot+0x1e7/0x2d0 fs/ext4/super.c:5666 dqget+0x785/0xfc0 fs/quota/dquot.c:896 __dquot_initialize+0x3bd/0xb70 fs/quota/dquot.c:1470 dquot_initialize fs/quota/dquot.c:1528 [inline] dquot_file_open fs/quota/dquot.c:2154 [inline] dquot_file_open+0x8c/0xb0 fs/quota/dquot.c:2148 ext4_file_open fs/ext4/file.c:471 [inline] ext4_file_open+0x20e/0x600 fs/ext4/file.c:445 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&dquot->dq_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 dquot_commit+0x4d/0x400 fs/quota/dquot.c:469 ext4_write_dquot+0x1e7/0x280 fs/ext4/super.c:5650 ext4_mark_dquot_dirty+0x111/0x1a0 fs/ext4/super.c:5701 mark_dquot_dirty fs/quota/dquot.c:341 [inline] mark_all_dquot_dirty fs/quota/dquot.c:379 [inline] __dquot_alloc_space+0x37e/0x860 fs/quota/dquot.c:1702 dquot_alloc_space_nodirty include/linux/quotaops.h:298 [inline] dquot_alloc_space include/linux/quotaops.h:311 [inline] dquot_alloc_block include/linux/quotaops.h:335 [inline] ext4_mb_new_blocks+0x58c/0x4370 fs/ext4/mballoc.c:4534 ext4_ext_map_blocks+0x2aa2/0x7390 fs/ext4/extents.c:4493 ext4_map_blocks+0x7a2/0x1a50 fs/ext4/inode.c:657 _ext4_get_block+0x208/0x530 fs/ext4/inode.c:810 __block_write_begin_int+0x46c/0x17b0 fs/buffer.c:1978 ext4_write_begin+0x52d/0x1610 fs/ext4/inode.c:1345 ext4_da_write_begin+0x737/0x10e0 fs/ext4/inode.c:3051 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3170 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe 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.4/32491: #0: 0000000094c33af4 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 #1: 0000000017768af7 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #1: 0000000017768af7 (sb_writers#3){.+.+}, at: vfs_write+0x463/0x540 fs/read_write.c:548 #2: 00000000b9bec14a (&sb->s_type->i_mutex_key#10){++++}, at: inode_trylock include/linux/fs.h:768 [inline] #2: 00000000b9bec14a (&sb->s_type->i_mutex_key#10){++++}, at: ext4_file_write_iter+0x21f/0xf20 fs/ext4/file.c:238 #3: 000000009e2f9284 (&ei->i_data_sem/2){++++}, at: ext4_map_blocks+0x740/0x1a50 fs/ext4/inode.c:650 #4: 000000004ce4a2b2 (dquot_srcu){....}, at: i_dquot fs/quota/dquot.c:921 [inline] #4: 000000004ce4a2b2 (dquot_srcu){....}, at: __dquot_alloc_space+0x1ad/0x860 fs/quota/dquot.c:1662 stack backtrace: CPU: 0 PID: 32491 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 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 dquot_commit+0x4d/0x400 fs/quota/dquot.c:469 ext4_write_dquot+0x1e7/0x280 fs/ext4/super.c:5650 ext4_mark_dquot_dirty+0x111/0x1a0 fs/ext4/super.c:5701 mark_dquot_dirty fs/quota/dquot.c:341 [inline] mark_all_dquot_dirty fs/quota/dquot.c:379 [inline] __dquot_alloc_space+0x37e/0x860 fs/quota/dquot.c:1702 dquot_alloc_space_nodirty include/linux/quotaops.h:298 [inline] dquot_alloc_space include/linux/quotaops.h:311 [inline] dquot_alloc_block include/linux/quotaops.h:335 [inline] ext4_mb_new_blocks+0x58c/0x4370 fs/ext4/mballoc.c:4534 ext4_ext_map_blocks+0x2aa2/0x7390 fs/ext4/extents.c:4493 ext4_map_blocks+0x7a2/0x1a50 fs/ext4/inode.c:657 _ext4_get_block+0x208/0x530 fs/ext4/inode.c:810 __block_write_begin_int+0x46c/0x17b0 fs/buffer.c:1978 ext4_write_begin+0x52d/0x1610 fs/ext4/inode.c:1345 ext4_da_write_begin+0x737/0x10e0 fs/ext4/inode.c:3051 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3170 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f46e74e20c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f46e5a54168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f46e7601f80 RCX: 00007f46e74e20c9 RDX: 000000000000fea7 RSI: 00000000200000c0 RDI: 0000000000000005 RBP: 00007f46e753dae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe2ffc04af R14: 00007f46e5a54300 R15: 0000000000022000 EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop4): ext4_orphan_get:1256: comm syz-executor.4: bad orphan inode 34020 EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 kauditd_printk_skb: 30 callbacks suppressed audit: type=1800 audit(1675674102.405:590): pid=32733 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="file0" dev="sda1" ino=14534 res=0 audit: type=1804 audit(1675674102.495:591): pid=32733 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir1784034305/syzkaller.Dijcs4/961/file0" dev="sda1" ino=14534 res=1 IPVS: ftp: loaded support on port[0] = 21 audit: type=1800 audit(1675674102.945:592): pid=320 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=13942 res=0 audit: type=1804 audit(1675674102.945:593): pid=320 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir50017867/syzkaller.EtN64D/1025/file0" dev="sda1" ino=13942 res=1 audit: type=1800 audit(1675674103.345:594): pid=403 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="file0" dev="sda1" ino=14836 res=0 audit: type=1804 audit(1675674103.405:595): pid=403 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir1784034305/syzkaller.Dijcs4/962/file0" dev="sda1" ino=14836 res=1 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 audit: type=1800 audit(1675674106.106:596): pid=468 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=15060 res=0 overlayfs: unrecognized mount option "lo=./file0" or missing value audit: type=1804 audit(1675674107.956:597): pid=468 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir50017867/syzkaller.EtN64D/1026/file0" dev="sda1" ino=15060 res=1 IPVS: ftp: loaded support on port[0] = 21 overlayfs: unrecognized mount option "lo=./file0" or missing value overlayfs: unrecognized mount option "lo=./file0" or missing value audit: type=1800 audit(1675674109.166:598): pid=560 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=15314 res=0 IPVS: ftp: loaded support on port[0] = 21