======================================================
WARNING: possible circular locking dependency detected
4.14.299-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.1/8013 is trying to acquire lock:
 (&dat_lock_key){.+.+}, at: [<ffffffff826ea728>] nilfs_count_free_blocks+0x68/0x180 fs/nilfs2/the_nilfs.c:707

but task is already holding lock:
 (&nilfs->ns_sem){++++}, at: [<ffffffff826c03f9>] nilfs_put_super+0x139/0x190 fs/nilfs2/super.c:483

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&nilfs->ns_sem){++++}:
       down_write+0x34/0x90 kernel/locking/rwsem.c:54
       nilfs_set_error fs/nilfs2/super.c:95 [inline]
       __nilfs_error+0x176/0x399 fs/nilfs2/super.c:140
       nilfs_bmap_convert_error fs/nilfs2/bmap.c:44 [inline]
       nilfs_bmap_lookup_contig+0x130/0x170 fs/nilfs2/bmap.c:104
       nilfs_get_block+0x1bd/0x7a0 fs/nilfs2/inode.c:93
       do_mpage_readpage+0x615/0x1470 fs/mpage.c:211
       mpage_readpages+0x2d6/0x5f0 fs/mpage.c:383
       read_pages mm/readahead.c:121 [inline]
       __do_page_cache_readahead+0x522/0x940 mm/readahead.c:199
       ra_submit mm/internal.h:66 [inline]
       ondemand_readahead.isra.0+0x514/0xb60 mm/readahead.c:486
       page_cache_sync_readahead mm/readahead.c:518 [inline]
       page_cache_sync_readahead+0xa6/0xf0 mm/readahead.c:503
       generic_file_buffered_read mm/filemap.c:2003 [inline]
       generic_file_read_iter+0xfbc/0x21c0 mm/filemap.c:2273
       call_read_iter include/linux/fs.h:1774 [inline]
       new_sync_read fs/read_write.c:401 [inline]
       __vfs_read+0x449/0x620 fs/read_write.c:413
       integrity_kernel_read+0x11b/0x1b0 security/integrity/iint.c:199
       ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:381 [inline]
       ima_calc_file_shash security/integrity/ima/ima_crypto.c:410 [inline]
       ima_calc_file_hash+0x3ee/0x780 security/integrity/ima/ima_crypto.c:467
       ima_collect_measurement+0x39d/0x430 security/integrity/ima/ima_api.c:227
       process_measurement+0x78b/0xb20 security/integrity/ima/ima_main.c:264
       do_last fs/namei.c:3435 [inline]
       path_openat+0x10ad/0x2970 fs/namei.c:3571
       do_filp_open+0x179/0x3c0 fs/namei.c:3605
       do_sys_open+0x296/0x410 fs/open.c:1081
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x5e/0xd3

-> #0 (&dat_lock_key){.+.+}:
       lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
       down_read+0x36/0x80 kernel/locking/rwsem.c:24
       nilfs_count_free_blocks+0x68/0x180 fs/nilfs2/the_nilfs.c:707
       nilfs_set_log_cursor fs/nilfs2/super.c:248 [inline]
       nilfs_cleanup_super+0x123/0x450 fs/nilfs2/super.c:330
       nilfs_put_super+0x141/0x190 fs/nilfs2/super.c:484
       generic_shutdown_super+0x144/0x370 fs/super.c:446
       kill_block_super+0x95/0xe0 fs/super.c:1161
       deactivate_locked_super+0x6c/0xd0 fs/super.c:319
       deactivate_super+0x7f/0xa0 fs/super.c:350
       cleanup_mnt+0x186/0x2c0 fs/namespace.c:1183
       task_work_run+0x11f/0x190 kernel/task_work.c:113
       tracehook_notify_resume include/linux/tracehook.h:191 [inline]
       exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
       prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
       syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
       do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
       entry_SYSCALL_64_after_hwframe+0x5e/0xd3

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&nilfs->ns_sem);
                               lock(&dat_lock_key);
                               lock(&nilfs->ns_sem);
  lock(&dat_lock_key);

 *** DEADLOCK ***

2 locks held by syz-executor.1/8013:
 #0:  (&type->s_umount_key#78){+.+.}, at: [<ffffffff81878187>] deactivate_super+0x77/0xa0 fs/super.c:349
 #1:  (&nilfs->ns_sem){++++}, at: [<ffffffff826c03f9>] nilfs_put_super+0x139/0x190 fs/nilfs2/super.c:483

stack backtrace:
CPU: 0 PID: 8013 Comm: syz-executor.1 Not tainted 4.14.299-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
 check_prev_add kernel/locking/lockdep.c:1905 [inline]
 check_prevs_add kernel/locking/lockdep.c:2022 [inline]
 validate_chain kernel/locking/lockdep.c:2464 [inline]
 __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 down_read+0x36/0x80 kernel/locking/rwsem.c:24
 nilfs_count_free_blocks+0x68/0x180 fs/nilfs2/the_nilfs.c:707
 nilfs_set_log_cursor fs/nilfs2/super.c:248 [inline]
 nilfs_cleanup_super+0x123/0x450 fs/nilfs2/super.c:330
 nilfs_put_super+0x141/0x190 fs/nilfs2/super.c:484
 generic_shutdown_super+0x144/0x370 fs/super.c:446
 kill_block_super+0x95/0xe0 fs/super.c:1161
 deactivate_locked_super+0x6c/0xd0 fs/super.c:319
 deactivate_super+0x7f/0xa0 fs/super.c:350
 cleanup_mnt+0x186/0x2c0 fs/namespace.c:1183
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
NILFS (loop1): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
audit: type=1804 audit(1668753804.078:13): pid=11531 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir1541361482/syzkaller.KzthmS/55/file0/file2" dev="loop1" ino=16 res=1
Remounting filesystem read-only
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
audit: type=1800 audit(1668753804.458:14): pid=11497 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.1" name="file2" dev="loop1" ino=16 res=0
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
audit: type=1800 audit(1668753804.558:15): pid=11531 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.1" name="file2" dev="loop1" ino=16 res=0
NILFS (loop1): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
audit: type=1804 audit(1668753804.768:16): pid=11583 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir3084901278/syzkaller.T2T60t/57/bus" dev="sda1" ino=14038 res=1
EXT4-fs (loop3): Unrecognized mount option "sma" or missing value
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
audit: type=1800 audit(1668753804.768:17): pid=11583 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=14038 res=0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
Zero length message leads to an empty skb
Remounting filesystem read-only
netlink: 16 bytes leftover after parsing attributes in process `syz-executor.2'.
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
audit: type=1804 audit(1668753805.028:18): pid=11596 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir1541361482/syzkaller.KzthmS/56/file0/file2" dev="loop1" ino=16 res=1
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
audit: type=1800 audit(1668753805.378:19): pid=11572 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.1" name="file2" dev="loop1" ino=16 res=0
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop1): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
EXT4-fs (loop3): Unrecognized mount option "sma" or missing value
EXT4-fs (loop5): Unrecognized mount option "sma" or missing value
EXT4-fs (loop3): Unrecognized mount option "sma" or missing value
kauditd_printk_skb: 7 callbacks suppressed
audit: type=1804 audit(1668753806.878:27): pid=11698 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir3077790436/syzkaller.K1JsPQ/62/bus" dev="sda1" ino=14083 res=1
EXT4-fs (loop5): Unrecognized mount option "sma" or missing value
audit: type=1800 audit(1668753806.878:28): pid=11698 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="sda1" ino=14083 res=0
F2FS-fs (loop4): Invalid blocksize (65536), supports only 4KB

F2FS-fs (loop4): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop4): Found nat_bits in checkpoint
F2FS-fs (loop4): Mounted with checkpoint version = 3e17dab1
audit: type=1804 audit(1668753807.358:29): pid=11714 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir4064603503/syzkaller.wF717Y/81/file0/bus" dev="loop4" ino=10 res=1
audit: type=1804 audit(1668753807.358:30): pid=11714 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir4064603503/syzkaller.wF717Y/81/file0/bus" dev="loop4" ino=10 res=1
audit: type=1804 audit(1668753807.358:31): pid=11714 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir4064603503/syzkaller.wF717Y/81/file0/bus" dev="loop4" ino=10 res=1
ISO 9660 Extensions: Microsoft Joliet Level 0
audit: type=1804 audit(1668753808.168:32): pid=11746 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir3084901278/syzkaller.T2T60t/60/bus" dev="sda1" ino=14092 res=1
audit: type=1800 audit(1668753808.168:33): pid=11746 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=14092 res=0
audit: type=1804 audit(1668753808.238:34): pid=11747 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir3077790436/syzkaller.K1JsPQ/63/bus" dev="sda1" ino=14091 res=1
audit: type=1800 audit(1668753808.238:35): pid=11747 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="sda1" ino=14091 res=0
ISO 9660 Extensions: Microsoft Joliet Level 0
F2FS-fs (loop5): Invalid blocksize (65536), supports only 4KB

F2FS-fs (loop5): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop5): Found nat_bits in checkpoint
ISO 9660 Extensions: Microsoft Joliet Level 0
F2FS-fs (loop5): Mounted with checkpoint version = 3e17dab1
audit: type=1804 audit(1668753808.958:36): pid=11800 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir3077790436/syzkaller.K1JsPQ/64/file0/bus" dev="loop5" ino=10 res=1
F2FS-fs (loop4): Invalid blocksize (65536), supports only 4KB

F2FS-fs (loop4): Can't find valid F2FS filesystem in 1th superblock
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): unrecognized mount option "snapshot=0x0000000000000001"
squashfs: SQUASHFS error: unable to read inode lookup table
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1
kauditd_printk_skb: 26 callbacks suppressed
audit: type=1804 audit(1668753812.198:63): pid=12017 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir3084901278/syzkaller.T2T60t/66/file0/bus" dev="loop3" ino=10 res=1
squashfs: SQUASHFS error: unable to read inode lookup table
audit: type=1804 audit(1668753812.198:64): pid=12017 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.3" name="/root/syzkaller-testdir3084901278/syzkaller.T2T60t/66/file0/bus" dev="loop3" ino=10 res=1
audit: type=1804 audit(1668753812.198:65): pid=12017 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir3084901278/syzkaller.T2T60t/66/file0/bus" dev="loop3" ino=10 res=1
audit: type=1804 audit(1668753812.238:66): pid=12012 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir4064603503/syzkaller.wF717Y/84/file0/bus" dev="loop4" ino=10 res=1
audit: type=1804 audit(1668753812.238:67): pid=12012 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir4064603503/syzkaller.wF717Y/84/file0/bus" dev="loop4" ino=10 res=1
audit: type=1804 audit(1668753812.248:68): pid=12012 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir4064603503/syzkaller.wF717Y/84/file0/bus" dev="loop4" ino=10 res=1