WARNING: the mand mount option is being deprecated and
         will be removed in v5.15!
======================================================
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
======================================================
WARNING: possible circular locking dependency detected
4.14.297-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/8008 is trying to acquire lock:
 (&dat_lock_key){.+.+}, at: [<ffffffff826ea668>] nilfs_count_free_blocks+0x68/0x180 fs/nilfs2/the_nilfs.c:707

but task is already holding lock:
 (&nilfs->ns_sem){++++}, at: [<ffffffff826c0339>] 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.0/8008:
 #0:  (&type->s_umount_key#62){+.+.}, at: [<ffffffff81878187>] deactivate_super+0x77/0xa0 fs/super.c:349
 #1:  (&nilfs->ns_sem){++++}, at: [<ffffffff826c0339>] nilfs_put_super+0x139/0x190 fs/nilfs2/super.c:483

stack backtrace:
CPU: 0 PID: 8008 Comm: syz-executor.0 Not tainted 4.14.297-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
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 (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
Remounting filesystem read-only
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
audit: type=1800 audit(1667455802.679:3): pid=10569 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.0" name="file2" dev="loop0" ino=16 res=0
audit: type=1804 audit(1667455802.739:4): pid=10624 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir2252209625/syzkaller.BB9Ucy/54/bus" dev="sda1" ino=14027 res=1
audit: type=1800 audit(1667455802.739:5): pid=10624 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=14027 res=0
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
Remounting filesystem read-only
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
NILFS (loop0): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop0): nilfs_bmap_lookup_contig: broken bmap (inode number=16)
audit: type=1800 audit(1667455803.440:6): pid=10647 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.0" name="file2" dev="loop0" ino=16 res=0
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
audit: type=1804 audit(1667455808.940:7): pid=10962 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir4170824954/syzkaller.1SXntQ/57/bus" dev="sda1" ino=13992 res=1
audit: type=1804 audit(1667455809.230:8): pid=11018 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir4170824954/syzkaller.1SXntQ/58/bus" dev="sda1" ino=13992 res=1
audit: type=1804 audit(1667455809.470:9): pid=11049 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir4170824954/syzkaller.1SXntQ/59/bus" dev="sda1" ino=13992 res=1
nla_parse: 2 callbacks suppressed
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
audit: type=1804 audit(1667455809.730:10): pid=11080 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir4170824954/syzkaller.1SXntQ/60/bus" dev="sda1" ino=14025 res=1
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
JFS: remount-ro"nointegrity is an invalid error handler
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'.
JFS: remount-ro"nointegrity is an invalid error handler
bond2 (uninitialized): Released all slaves
Zero length message leads to an empty skb
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
print_req_error: I/O error, dev loop0, sector 0
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'.
JFS: remount-ro"nointegrity is an invalid error handler
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'.
JFS: remount-ro"nointegrity is an invalid error handler
bond3 (uninitialized): Released all slaves
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'.
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'.
bond4 (uninitialized): Released all slaves
bond5 (uninitialized): Released all slaves
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds