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Message-ID: <674cbf6d.050a0220.48a03.0011.GAE@google.com>
Date: Sun, 01 Dec 2024 11:56:29 -0800
From: syzbot <syzbot+7791482179507f327138@...kaller.appspotmail.com>
To: clm@...com, dsterba@...e.com, josef@...icpanda.com,
linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] [btrfs?] possible deadlock in btrfs_search_slot (3)
Hello,
syzbot found the following issue on:
HEAD commit: aaf20f870da0 Merge tag 'rpmsg-v6.13' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1655af5f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=493f836b3188006b
dashboard link: https://syzkaller.appspot.com/bug?extid=7791482179507f327138
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/08102d213bca/disk-aaf20f87.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/80a985df7f54/vmlinux-aaf20f87.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2eccce18d2d9/bzImage-aaf20f87.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7791482179507f327138@...kaller.appspotmail.com
BTRFS info (device loop6): first mount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf
BTRFS info (device loop6): using crc32c (crc32c-intel) checksum algorithm
BTRFS info (device loop6): using free-space-tree
======================================================
WARNING: possible circular locking dependency detected
6.12.0-syzkaller-10296-gaaf20f870da0 #0 Not tainted
------------------------------------------------------
syz.6.761/8746 is trying to acquire lock:
ffff8880262b3598 (btrfs-tree-00){++++}-{4:4}, at: btrfs_tree_read_lock_nested+0x2f/0x250 fs/btrfs/locking.c:146
but task is already holding lock:
ffff8880262b2878 (btrfs-tree-01){++++}-{4:4}, at: btrfs_tree_read_lock_nested+0x2f/0x250 fs/btrfs/locking.c:146
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #8 (btrfs-tree-01){++++}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
down_read_nested+0xb5/0xa50 kernel/locking/rwsem.c:1649
btrfs_tree_read_lock_nested+0x2f/0x250 fs/btrfs/locking.c:146
btrfs_tree_read_lock fs/btrfs/locking.h:178 [inline]
btrfs_read_lock_root_node+0x3f/0xd0 fs/btrfs/locking.c:267
btrfs_search_slot_get_root fs/btrfs/ctree.c:1790 [inline]
btrfs_search_slot+0x4f7/0x3150 fs/btrfs/ctree.c:2112
btrfs_lookup_file_extent+0x14c/0x210 fs/btrfs/file-item.c:267
btrfs_drop_extents+0x453/0x33e0 fs/btrfs/file.c:233
__cow_file_range_inline+0x2e9/0x1140 fs/btrfs/inode.c:679
cow_file_range_inline+0x317/0x3d0 fs/btrfs/inode.c:738
cow_file_range+0x39e/0x11f0 fs/btrfs/inode.c:1357
run_delalloc_cow+0x107/0x1f0 fs/btrfs/inode.c:1743
submit_uncompressed_range+0x191/0x3a0 fs/btrfs/inode.c:1128
submit_one_async_extent fs/btrfs/inode.c:1183 [inline]
submit_compressed_extents+0x7b4/0x16e0 fs/btrfs/inode.c:1632
run_ordered_work fs/btrfs/async-thread.c:245 [inline]
btrfs_work_helper+0x56d/0xc50 fs/btrfs/async-thread.c:324
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #7 (btrfs_trans_num_extwriters){++++}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
join_transaction+0x19c/0xda0 fs/btrfs/transaction.c:313
start_transaction+0xaf8/0x1670 fs/btrfs/transaction.c:697
btrfs_rebuild_free_space_tree+0xaf/0x490 fs/btrfs/free-space-tree.c:1327
btrfs_start_pre_rw_mount+0xeed/0x1300 fs/btrfs/disk-io.c:2998
open_ctree+0x24f5/0x2a30 fs/btrfs/disk-io.c:3543
btrfs_fill_super fs/btrfs/super.c:972 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1894 [inline]
btrfs_get_tree+0x1274/0x1a10 fs/btrfs/super.c:2105
vfs_get_tree+0x92/0x2b0 fs/super.c:1814
fc_mount+0x1b/0xb0 fs/namespace.c:1231
btrfs_get_tree_subvol fs/btrfs/super.c:2068 [inline]
btrfs_get_tree+0x65b/0x1a10 fs/btrfs/super.c:2106
vfs_get_tree+0x92/0x2b0 fs/super.c:1814
do_new_mount+0x2be/0xb40 fs/namespace.c:3507
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4057 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #6 (btrfs_trans_num_writers){++++}-{0:0}:
reacquire_held_locks+0x3eb/0x690 kernel/locking/lockdep.c:5374
__lock_release kernel/locking/lockdep.c:5563 [inline]
lock_release+0x396/0xa30 kernel/locking/lockdep.c:5870
percpu_up_read include/linux/percpu-rwsem.h:99 [inline]
__sb_end_write include/linux/fs.h:1720 [inline]
sb_end_intwrite+0x26/0x1c0 include/linux/fs.h:1837
__btrfs_end_transaction+0x251/0x630 fs/btrfs/transaction.c:1068
btrfs_dirty_inode+0x151/0x1a0 fs/btrfs/inode.c:6059
inode_update_time fs/inode.c:2124 [inline]
touch_atime+0x27f/0x690 fs/inode.c:2197
file_accessed include/linux/fs.h:2539 [inline]
btrfs_file_mmap+0xbd/0x120 fs/btrfs/file.c:1953
call_mmap include/linux/fs.h:2183 [inline]
mmap_file mm/internal.h:124 [inline]
__mmap_new_file_vma mm/vma.c:2291 [inline]
__mmap_new_vma mm/vma.c:2355 [inline]
__mmap_region+0x2206/0x2cd0 mm/vma.c:2456
mmap_region+0x226/0x2c0 mm/mmap.c:1347
do_mmap+0x8f0/0x1000 mm/mmap.c:496
vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:580
ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #5 (&mm->mmap_lock){++++}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__might_fault+0xc6/0x120 mm/memory.c:6751
_inline_copy_from_user include/linux/uaccess.h:162 [inline]
_copy_from_user+0x2a/0xc0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
__blk_trace_setup kernel/trace/blktrace.c:626 [inline]
blk_trace_ioctl+0x1ad/0x9a0 kernel/trace/blktrace.c:740
blkdev_ioctl+0x40c/0x6a0 block/ioctl.c:682
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf7/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #4 (&q->debugfs_mutex){+.+.}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
blk_mq_init_sched+0x3fa/0x830 block/blk-mq-sched.c:473
elevator_init_mq+0x20e/0x320 block/elevator.c:610
add_disk_fwnode+0x10d/0xf80 block/genhd.c:413
sd_probe+0xba6/0x1100 drivers/scsi/sd.c:4024
really_probe+0x2ba/0xad0 drivers/base/dd.c:658
__driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800
driver_probe_device+0x50/0x430 drivers/base/dd.c:830
__device_attach_driver+0x2d6/0x530 drivers/base/dd.c:958
bus_for_each_drv+0x250/0x2e0 drivers/base/bus.c:459
__device_attach_async_helper+0x22d/0x300 drivers/base/dd.c:987
async_run_entry_fn+0xaa/0x420 kernel/async.c:129
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #3 (&q->q_usage_counter(queue)#50){++++}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
blk_queue_enter+0xe1/0x600 block/blk-core.c:328
blk_mq_alloc_request+0x4fa/0xaa0 block/blk-mq.c:652
scsi_alloc_request drivers/scsi/scsi_lib.c:1222 [inline]
scsi_execute_cmd+0x177/0x1090 drivers/scsi/scsi_lib.c:304
read_capacity_16+0x2b4/0x1450 drivers/scsi/sd.c:2655
sd_read_capacity drivers/scsi/sd.c:2824 [inline]
sd_revalidate_disk+0x1013/0xbce0 drivers/scsi/sd.c:3734
sd_probe+0x9fa/0x1100 drivers/scsi/sd.c:4010
really_probe+0x2ba/0xad0 drivers/base/dd.c:658
__driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800
driver_probe_device+0x50/0x430 drivers/base/dd.c:830
__device_attach_driver+0x2d6/0x530 drivers/base/dd.c:958
bus_for_each_drv+0x250/0x2e0 drivers/base/bus.c:459
__device_attach_async_helper+0x22d/0x300 drivers/base/dd.c:987
async_run_entry_fn+0xaa/0x420 kernel/async.c:129
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #2 (&q->limits_lock){+.+.}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
queue_limits_start_update include/linux/blkdev.h:945 [inline]
loop_reconfigure_limits+0x283/0x9e0 drivers/block/loop.c:1003
loop_set_block_size drivers/block/loop.c:1473 [inline]
lo_simple_ioctl drivers/block/loop.c:1496 [inline]
lo_ioctl+0x1351/0x1f50 drivers/block/loop.c:1559
blkdev_ioctl+0x57f/0x6a0 block/ioctl.c:693
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf7/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&q->q_usage_counter(io)#23){++++}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
bio_queue_enter block/blk.h:75 [inline]
blk_mq_submit_bio+0x1536/0x23a0 block/blk-mq.c:3092
__submit_bio+0x2c6/0x560 block/blk-core.c:629
__submit_bio_noacct_mq block/blk-core.c:710 [inline]
submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:739
btrfs_submit_chunk fs/btrfs/bio.c:745 [inline]
btrfs_submit_bbio+0xf93/0x18e0 fs/btrfs/bio.c:773
read_extent_buffer_pages+0x65a/0x910 fs/btrfs/extent_io.c:3558
btrfs_read_extent_buffer+0xd9/0x770 fs/btrfs/disk-io.c:229
read_block_for_search+0x79e/0xbb0 fs/btrfs/ctree.c:1619
btrfs_search_slot+0x121b/0x3150 fs/btrfs/ctree.c:2236
btrfs_init_root_free_objectid+0x148/0x330 fs/btrfs/disk-io.c:4837
btrfs_init_fs_root fs/btrfs/disk-io.c:1137 [inline]
btrfs_get_root_ref+0x5d7/0xc30 fs/btrfs/disk-io.c:1364
btrfs_get_fs_root fs/btrfs/disk-io.c:1416 [inline]
open_ctree+0x2470/0x2a30 fs/btrfs/disk-io.c:3532
btrfs_fill_super fs/btrfs/super.c:972 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1894 [inline]
btrfs_get_tree+0x1274/0x1a10 fs/btrfs/super.c:2105
vfs_get_tree+0x92/0x2b0 fs/super.c:1814
fc_mount+0x1b/0xb0 fs/namespace.c:1231
btrfs_get_tree_subvol fs/btrfs/super.c:2068 [inline]
btrfs_get_tree+0x65b/0x1a10 fs/btrfs/super.c:2106
vfs_get_tree+0x92/0x2b0 fs/super.c:1814
do_new_mount+0x2be/0xb40 fs/namespace.c:3507
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4057 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (btrfs-tree-00){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
down_read_nested+0xb5/0xa50 kernel/locking/rwsem.c:1649
btrfs_tree_read_lock_nested+0x2f/0x250 fs/btrfs/locking.c:146
btrfs_tree_read_lock fs/btrfs/locking.h:178 [inline]
btrfs_search_slot+0x136b/0x3150 fs/btrfs/ctree.c:2260
btrfs_lookup_file_extent+0x14c/0x210 fs/btrfs/file-item.c:267
run_delalloc_nocow+0x350/0x11e0 fs/btrfs/inode.c:2022
btrfs_run_delalloc_range+0x31d/0xf70 fs/btrfs/inode.c:2290
writepage_delalloc+0x8aa/0xc70 fs/btrfs/extent_io.c:1239
extent_writepage fs/btrfs/extent_io.c:1499 [inline]
extent_write_cache_pages fs/btrfs/extent_io.c:2194 [inline]
btrfs_writepages+0x1157/0x2370 fs/btrfs/extent_io.c:2325
do_writepages+0x361/0x880 mm/page-writeback.c:2702
filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
__filemap_fdatawrite_range mm/filemap.c:430 [inline]
filemap_fdatawrite_range+0x215/0x2c0 mm/filemap.c:448
btrfs_fdatawrite_range fs/btrfs/file.c:3719 [inline]
start_ordered_ops fs/btrfs/file.c:1454 [inline]
btrfs_sync_file+0x3ac/0x1230 fs/btrfs/file.c:1536
generic_write_sync include/linux/fs.h:2904 [inline]
btrfs_do_write_iter+0x5e0/0x760 fs/btrfs/file.c:1406
new_sync_write fs/read_write.c:586 [inline]
vfs_write+0xaed/0xd30 fs/read_write.c:679
ksys_write+0x18f/0x2b0 fs/read_write.c:731
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
btrfs-tree-00 --> btrfs_trans_num_extwriters --> btrfs-tree-01
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(btrfs-tree-01);
lock(btrfs_trans_num_extwriters);
lock(btrfs-tree-01);
rlock(btrfs-tree-00);
*** DEADLOCK ***
3 locks held by syz.6.761/8746:
#0: ffff88807e73ed38 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x254/0x320 fs/file.c:1191
#1: ffff8880245de420 (sb_writers#17){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline]
#1: ffff8880245de420 (sb_writers#17){.+.+}-{0:0}, at: vfs_write+0x225/0xd30 fs/read_write.c:675
#2: ffff8880262b2878 (btrfs-tree-01){++++}-{4:4}, at: btrfs_tree_read_lock_nested+0x2f/0x250 fs/btrfs/locking.c:146
stack backtrace:
CPU: 1 UID: 0 PID: 8746 Comm: syz.6.761 Not tainted 6.12.0-syzkaller-10296-gaaf20f870da0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
down_read_nested+0xb5/0xa50 kernel/locking/rwsem.c:1649
btrfs_tree_read_lock_nested+0x2f/0x250 fs/btrfs/locking.c:146
btrfs_tree_read_lock fs/btrfs/locking.h:178 [inline]
btrfs_search_slot+0x136b/0x3150 fs/btrfs/ctree.c:2260
btrfs_lookup_file_extent+0x14c/0x210 fs/btrfs/file-item.c:267
run_delalloc_nocow+0x350/0x11e0 fs/btrfs/inode.c:2022
btrfs_run_delalloc_range+0x31d/0xf70 fs/btrfs/inode.c:2290
writepage_delalloc+0x8aa/0xc70 fs/btrfs/extent_io.c:1239
extent_writepage fs/btrfs/extent_io.c:1499 [inline]
extent_write_cache_pages fs/btrfs/extent_io.c:2194 [inline]
btrfs_writepages+0x1157/0x2370 fs/btrfs/extent_io.c:2325
do_writepages+0x361/0x880 mm/page-writeback.c:2702
filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
__filemap_fdatawrite_range mm/filemap.c:430 [inline]
filemap_fdatawrite_range+0x215/0x2c0 mm/filemap.c:448
btrfs_fdatawrite_range fs/btrfs/file.c:3719 [inline]
start_ordered_ops fs/btrfs/file.c:1454 [inline]
btrfs_sync_file+0x3ac/0x1230 fs/btrfs/file.c:1536
generic_write_sync include/linux/fs.h:2904 [inline]
btrfs_do_write_iter+0x5e0/0x760 fs/btrfs/file.c:1406
new_sync_write fs/read_write.c:586 [inline]
vfs_write+0xaed/0xd30 fs/read_write.c:679
ksys_write+0x18f/0x2b0 fs/read_write.c:731
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1a48580809
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1a49300058 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1a48745fa0 RCX: 00007f1a48580809
RDX: 0000000000000006 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f1a485f393e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1a48745fa0 R15: 00007ffec059ee68
</TASK>
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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