NILFS (loop3): bad btree node (ino=3, blocknr=51): level = 0, flags = 0x0, nchildren = 0
NILFS error (device loop3): nilfs_bmap_lookup_at_level: broken bmap (inode number=3)
======================================================
WARNING: possible circular locking dependency detected
6.3.0-rc2-syzkaller-00387-g534293368afa #0 Not tainted
------------------------------------------------------
segctord/6639 is trying to acquire lock:
ffff88801ea8f090 (&nilfs->ns_sem){++++}-{3:3}, at: nilfs_set_error fs/nilfs2/super.c:92 [inline]
ffff88801ea8f090 (&nilfs->ns_sem){++++}-{3:3}, at: __nilfs_error+0x21f/0x4d0 fs/nilfs2/super.c:137
but task is already holding lock:
ffff888028427968 (&nilfs_bmap_dat_lock_key){++++}-{3:3}, at: nilfs_bmap_lookup_at_level+0x7f/0x3e0 fs/nilfs2/bmap.c:68
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&nilfs_bmap_dat_lock_key){++++}-{3:3}:
down_read+0x3d/0x50 kernel/locking/rwsem.c:1520
nilfs_bmap_lookup_at_level+0x7f/0x3e0 fs/nilfs2/bmap.c:68
nilfs_bmap_lookup fs/nilfs2/bmap.h:170 [inline]
nilfs_mdt_submit_block+0x1a1/0x9d0 fs/nilfs2/mdt.c:142
nilfs_mdt_read_block+0x92/0x3c0 fs/nilfs2/mdt.c:176
nilfs_mdt_get_block+0xea/0xcf0 fs/nilfs2/mdt.c:251
nilfs_palloc_get_block+0xc4/0x2b0 fs/nilfs2/alloc.c:216
nilfs_palloc_get_desc_block+0x134/0x190 fs/nilfs2/alloc.c:265
nilfs_palloc_prepare_alloc_entry+0x20a/0xa80 fs/nilfs2/alloc.c:524
nilfs_dat_prepare_alloc+0x23/0x130 fs/nilfs2/dat.c:78
nilfs_bmap_prepare_alloc_ptr fs/nilfs2/bmap.h:183 [inline]
nilfs_direct_insert+0x3f8/0x520 fs/nilfs2/direct.c:122
nilfs_bmap_do_insert fs/nilfs2/bmap.c:121 [inline]
nilfs_bmap_insert+0x27e/0x3f0 fs/nilfs2/bmap.c:147
nilfs_get_block+0x566/0xa50 fs/nilfs2/inode.c:101
__block_write_begin_int+0x3bd/0x14b0 fs/buffer.c:2034
__block_write_begin fs/buffer.c:2084 [inline]
block_write_begin+0xb9/0x4d0 fs/buffer.c:2145
nilfs_write_begin+0xa0/0x1a0 fs/nilfs2/inode.c:261
generic_perform_write+0x256/0x570 mm/filemap.c:3926
__generic_file_write_iter+0x39d/0x500 mm/filemap.c:4022
generic_file_write_iter+0xe3/0x350 mm/filemap.c:4086
call_write_iter include/linux/fs.h:1851 [inline]
do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735
do_iter_write+0x182/0x700 fs/read_write.c:861
vfs_iter_write+0x74/0xa0 fs/read_write.c:902
iter_file_splice_write+0x743/0xc80 fs/splice.c:778
do_splice_from fs/splice.c:856 [inline]
direct_splice_actor+0x114/0x180 fs/splice.c:1022
splice_direct_to_actor+0x335/0x8a0 fs/splice.c:977
do_splice_direct+0x1ab/0x280 fs/splice.c:1065
do_sendfile+0xb19/0x12c0 fs/read_write.c:1255
__do_sys_sendfile64 fs/read_write.c:1323 [inline]
__se_sys_sendfile64 fs/read_write.c:1309 [inline]
__x64_sys_sendfile64+0x1d0/0x210 fs/read_write.c:1309
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #2 (&bmap->b_sem){++++}-{3:3}:
down_write+0x92/0x200 kernel/locking/rwsem.c:1573
nilfs_bmap_clear+0x1c/0x90 fs/nilfs2/bmap.c:311
nilfs_clear_inode+0x288/0x330 fs/nilfs2/inode.c:906
nilfs_evict_inode+0x31c/0x440 fs/nilfs2/inode.c:925
evict+0x2ed/0x6b0 fs/inode.c:665
dispose_list+0x117/0x1e0 fs/inode.c:698
prune_icache_sb+0xeb/0x150 fs/inode.c:897
super_cache_scan+0x391/0x590 fs/super.c:106
do_shrink_slab+0x428/0xaa0 mm/vmscan.c:853
shrink_slab_memcg mm/vmscan.c:922 [inline]
shrink_slab+0x388/0x660 mm/vmscan.c:1001
shrink_one+0x502/0x810 mm/vmscan.c:5343
shrink_many mm/vmscan.c:5394 [inline]
lru_gen_shrink_node mm/vmscan.c:5511 [inline]
shrink_node+0x2064/0x35f0 mm/vmscan.c:6459
kswapd_shrink_node mm/vmscan.c:7262 [inline]
balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7452
kswapd+0x677/0xd60 mm/vmscan.c:7712
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
-> #1 (fs_reclaim){+.+.}-{0:0}:
__fs_reclaim_acquire mm/page_alloc.c:4716 [inline]
fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:4730
might_alloc include/linux/sched/mm.h:271 [inline]
slab_pre_alloc_hook mm/slab.h:728 [inline]
slab_alloc_node mm/slab.c:3241 [inline]
__kmem_cache_alloc_node+0x3b/0x3f0 mm/slab.c:3541
kmalloc_trace+0x26/0xe0 mm/slab_common.c:1061
kmalloc include/linux/slab.h:580 [inline]
kzalloc include/linux/slab.h:720 [inline]
nilfs_sysfs_create_device_group+0x81/0x850 fs/nilfs2/sysfs.c:982
init_nilfs+0xdc0/0x12f0 fs/nilfs2/the_nilfs.c:700
nilfs_fill_super fs/nilfs2/super.c:1056 [inline]
nilfs_mount+0x921/0x1150 fs/nilfs2/super.c:1324
legacy_get_tree+0x109/0x220 fs/fs_context.c:610
vfs_get_tree+0x8d/0x350 fs/super.c:1501
do_new_mount fs/namespace.c:3042 [inline]
path_mount+0x1342/0x1e40 fs/namespace.c:3372
do_mount fs/namespace.c:3385 [inline]
__do_sys_mount fs/namespace.c:3594 [inline]
__se_sys_mount fs/namespace.c:3571 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3571
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #0 (&nilfs->ns_sem){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3098 [inline]
check_prevs_add kernel/locking/lockdep.c:3217 [inline]
validate_chain kernel/locking/lockdep.c:3832 [inline]
__lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056
lock_acquire kernel/locking/lockdep.c:5669 [inline]
lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634
down_write+0x92/0x200 kernel/locking/rwsem.c:1573
nilfs_set_error fs/nilfs2/super.c:92 [inline]
__nilfs_error+0x21f/0x4d0 fs/nilfs2/super.c:137
nilfs_bmap_convert_error fs/nilfs2/bmap.c:35 [inline]
nilfs_bmap_lookup_at_level+0x327/0x3e0 fs/nilfs2/bmap.c:71
nilfs_bmap_lookup fs/nilfs2/bmap.h:170 [inline]
nilfs_mdt_submit_block+0x1a1/0x9d0 fs/nilfs2/mdt.c:142
nilfs_mdt_read_block+0x92/0x3c0 fs/nilfs2/mdt.c:176
nilfs_mdt_get_block+0xea/0xcf0 fs/nilfs2/mdt.c:251
nilfs_palloc_get_block+0xc4/0x2b0 fs/nilfs2/alloc.c:216
nilfs_palloc_get_desc_block+0x134/0x190 fs/nilfs2/alloc.c:265
nilfs_palloc_prepare_alloc_entry+0x20a/0xa80 fs/nilfs2/alloc.c:524
nilfs_dat_prepare_alloc fs/nilfs2/dat.c:78 [inline]
nilfs_dat_prepare_update+0xb0/0x270 fs/nilfs2/dat.c:250
nilfs_direct_propagate fs/nilfs2/direct.c:274 [inline]
nilfs_direct_propagate+0x1e0/0x320 fs/nilfs2/direct.c:256
nilfs_bmap_propagate+0x77/0x170 fs/nilfs2/bmap.c:337
nilfs_collect_file_data+0x49/0xd0 fs/nilfs2/segment.c:568
nilfs_segctor_apply_buffers+0x14a/0x470 fs/nilfs2/segment.c:1020
nilfs_segctor_scan_file+0x3f4/0x6f0 fs/nilfs2/segment.c:1069
nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1178 [inline]
nilfs_segctor_collect fs/nilfs2/segment.c:1505 [inline]
nilfs_segctor_do_construct+0x271b/0x7100 fs/nilfs2/segment.c:2047
nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2381
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2489 [inline]
nilfs_segctor_thread+0x3c7/0xf30 fs/nilfs2/segment.c:2572
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
other info that might help us debug this:
Chain exists of:
&nilfs->ns_sem --> &bmap->b_sem --> &nilfs_bmap_dat_lock_key
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&nilfs_bmap_dat_lock_key);
lock(&bmap->b_sem);
lock(&nilfs_bmap_dat_lock_key);
lock(&nilfs->ns_sem);
*** DEADLOCK ***
3 locks held by segctord/6639:
#0: ffff88801ea8f2a0 (&nilfs->ns_segctor_sem){++++}-{3:3}, at: nilfs_transaction_lock+0x266/0x410 fs/nilfs2/segment.c:357
#1: ffff888028235828 (&bmap->b_sem){++++}-{3:3}, at: nilfs_bmap_propagate+0x25/0x170 fs/nilfs2/bmap.c:336
#2: ffff888028427968 (&nilfs_bmap_dat_lock_key){++++}-{3:3}, at: nilfs_bmap_lookup_at_level+0x7f/0x3e0 fs/nilfs2/bmap.c:68
stack backtrace:
CPU: 1 PID: 6639 Comm: segctord Not tainted 6.3.0-rc2-syzkaller-00387-g534293368afa #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2178
check_prev_add kernel/locking/lockdep.c:3098 [inline]
check_prevs_add kernel/locking/lockdep.c:3217 [inline]
validate_chain kernel/locking/lockdep.c:3832 [inline]
__lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056
lock_acquire kernel/locking/lockdep.c:5669 [inline]
lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634
down_write+0x92/0x200 kernel/locking/rwsem.c:1573
nilfs_set_error fs/nilfs2/super.c:92 [inline]
__nilfs_error+0x21f/0x4d0 fs/nilfs2/super.c:137
nilfs_bmap_convert_error fs/nilfs2/bmap.c:35 [inline]
nilfs_bmap_lookup_at_level+0x327/0x3e0 fs/nilfs2/bmap.c:71
nilfs_bmap_lookup fs/nilfs2/bmap.h:170 [inline]
nilfs_mdt_submit_block+0x1a1/0x9d0 fs/nilfs2/mdt.c:142
nilfs_mdt_read_block+0x92/0x3c0 fs/nilfs2/mdt.c:176
nilfs_mdt_get_block+0xea/0xcf0 fs/nilfs2/mdt.c:251
nilfs_palloc_get_block+0xc4/0x2b0 fs/nilfs2/alloc.c:216
nilfs_palloc_get_desc_block+0x134/0x190 fs/nilfs2/alloc.c:265
nilfs_palloc_prepare_alloc_entry+0x20a/0xa80 fs/nilfs2/alloc.c:524
nilfs_dat_prepare_alloc fs/nilfs2/dat.c:78 [inline]
nilfs_dat_prepare_update+0xb0/0x270 fs/nilfs2/dat.c:250
nilfs_direct_propagate fs/nilfs2/direct.c:274 [inline]
nilfs_direct_propagate+0x1e0/0x320 fs/nilfs2/direct.c:256
nilfs_bmap_propagate+0x77/0x170 fs/nilfs2/bmap.c:337
nilfs_collect_file_data+0x49/0xd0 fs/nilfs2/segment.c:568
nilfs_segctor_apply_buffers+0x14a/0x470 fs/nilfs2/segment.c:1020
nilfs_segctor_scan_file+0x3f4/0x6f0 fs/nilfs2/segment.c:1069
nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1178 [inline]
nilfs_segctor_collect fs/nilfs2/segment.c:1505 [inline]
nilfs_segctor_do_construct+0x271b/0x7100 fs/nilfs2/segment.c:2047
nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2381
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2489 [inline]
nilfs_segctor_thread+0x3c7/0xf30 fs/nilfs2/segment.c:2572
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
Remounting filesystem read-only
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6639 at fs/nilfs2/sufile.c:539 nilfs_sufile_set_segment_usage+0x51c/0x6a0 fs/nilfs2/sufile.c:539
Modules linked in:
CPU: 0 PID: 6639 Comm: segctord Not tainted 6.3.0-rc2-syzkaller-00387-g534293368afa #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:nilfs_sufile_set_segment_usage+0x51c/0x6a0 fs/nilfs2/sufile.c:539
Code: 24 55 fe 48 8b 6c 24 48 48 85 ed 0f 85 5b ff ff ff e9 63 ff ff ff e8 13 24 55 fe e8 6e a4 d3 fd e9 db fe ff ff e8 04 24 55 fe <0f> 0b e9 0d fe ff ff e8 b8 40 a5 fe e9 c6 fb ff ff e8 ae 40 a5 fe
RSP: 0000:ffffc9000d44f9a8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880293d7418 RCX: 0000000000000000
RDX: ffff888026862000 RSI: ffffffff832ce1ac RDI: 0000000000000005
RBP: ffff888075c13050 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000004 R11: 69746e756f6d6552 R12: 0000000000000000
R13: 1ffff92001a89f3a R14: ffff8880293d78a0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f2bd32ea60 CR3: 0000000025013000 CR4: 0000000000152ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
nilfs_cancel_segusage fs/nilfs2/segment.c:1462 [inline]
nilfs_segctor_abort_construction+0x5c1/0xe20 fs/nilfs2/segment.c:1803
nilfs_segctor_do_construct+0x363d/0x7100 fs/nilfs2/segment.c:2111
nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2381
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2489 [inline]
nilfs_segctor_thread+0x3c7/0xf30 fs/nilfs2/segment.c:2572
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>