======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc5-syzkaller-00013-g99fa936e8e4f #0 Tainted: G U
------------------------------------------------------
syz.7.3369/20412 is trying to acquire lock:
ffff8881437aba90 (set->srcu){.+.+}-{0:0}, at: srcu_lock_sync include/linux/srcu.h:176 [inline]
ffff8881437aba90 (set->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x99/0x2a0 kernel/rcu/srcutree.c:1418
but task is already holding lock:
ffff888143f91308 (&q->q_usage_counter(io)#51){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x15/0x20 block/blk-mq.c:215
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #6 (&q->q_usage_counter(io)#51){++++}-{0:0}:
bio_queue_enter block/blk.h:78 [inline]
blk_mq_submit_bio+0x20f5/0x2610 block/blk-mq.c:3091
__submit_bio+0x3d1/0x690 block/blk-core.c:628
__submit_bio_noacct_mq block/blk-core.c:715 [inline]
submit_bio_noacct_nocheck+0x698/0xd70 block/blk-core.c:744
submit_bio_noacct+0x50d/0x1ec0 block/blk-core.c:867
mpage_bio_submit_read fs/mpage.c:75 [inline]
mpage_readahead+0x41d/0x590 fs/mpage.c:377
read_pages+0x1a7/0xc60 mm/readahead.c:161
page_cache_ra_unbounded+0x426/0x7d0 mm/readahead.c:298
do_page_cache_ra mm/readahead.c:328 [inline]
force_page_cache_ra+0x24b/0x340 mm/readahead.c:357
page_cache_sync_ra+0x158/0xa30 mm/readahead.c:585
filemap_get_pages+0xb62/0x1c30 mm/filemap.c:2580
filemap_read+0x3c5/0xe70 mm/filemap.c:2691
blkdev_read_iter+0x187/0x4b0 block/fops.c:796
new_sync_read fs/read_write.c:484 [inline]
vfs_read+0x886/0xbf0 fs/read_write.c:565
ksys_read+0x12b/0x250 fs/read_write.c:708
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #5 (mapping.invalidate_lock#2){.+.+}-{4:4}:
down_read+0x9a/0x330 kernel/locking/rwsem.c:1524
filemap_invalidate_lock_shared include/linux/fs.h:932 [inline]
filemap_fault+0x1845/0x2ca0 mm/filemap.c:3454
__do_fault+0x10a/0x490 mm/memory.c:4988
do_read_fault mm/memory.c:5403 [inline]
do_fault mm/memory.c:5537 [inline]
do_pte_missing+0xecf/0x3e10 mm/memory.c:4058
handle_pte_fault mm/memory.c:5900 [inline]
__handle_mm_fault+0x1166/0x2c60 mm/memory.c:6043
handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6212
faultin_page mm/gup.c:1196 [inline]
__get_user_pages+0x773/0x36f0 mm/gup.c:1491
populate_vma_page_range+0x27f/0x3a0 mm/gup.c:1929
__mm_populate+0x1d6/0x380 mm/gup.c:2032
mm_populate include/linux/mm.h:3386 [inline]
vm_mmap_pgoff+0x2d3/0x3a0 mm/util.c:580
ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:607
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #4 (&mm->mmap_lock){++++}-{4:4}:
__might_fault mm/memory.c:6851 [inline]
__might_fault+0x11b/0x190 mm/memory.c:6844
_inline_copy_from_user include/linux/uaccess.h:162 [inline]
_copy_from_user+0x29/0xd0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
csum_and_copy_from_user include/net/checksum.h:31 [inline]
copy_from_user_iter_csum net/core/skbuff.c:7182 [inline]
iterate_ubuf include/linux/iov_iter.h:30 [inline]
iterate_and_advance2 include/linux/iov_iter.h:300 [inline]
csum_and_copy_from_iter_full+0x218/0x1e20 net/core/skbuff.c:7194
ip_generic_getfrag+0x175/0x260 net/ipv4/ip_output.c:936
raw6_getfrag+0x22d/0x2a0 net/ipv6/raw.c:737
__ip6_append_data.isra.0+0x3dca/0x4650 net/ipv6/ip6_output.c:1701
ip6_append_data+0x1e6/0x500 net/ipv6/ip6_output.c:1856
rawv6_sendmsg+0x15c9/0x4610 net/ipv6/raw.c:920
inet_sendmsg+0x119/0x140 net/ipv4/af_inet.c:851
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:733 [inline]
____sys_sendmsg+0x98c/0xc90 net/socket.c:2573
___sys_sendmsg+0x135/0x1e0 net/socket.c:2627
__sys_sendmsg+0x16e/0x220 net/socket.c:2659
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #3 (sk_lock-AF_INET6){+.+.}-{0:0}:
lock_sock_nested+0x3a/0xf0 net/core/sock.c:3662
lock_sock include/net/sock.h:1624 [inline]
inet_autobind+0x1a/0x1a0 net/ipv4/af_inet.c:178
inet_send_prepare+0x317/0x530 net/ipv4/af_inet.c:837
inet_sendmsg+0x43/0x140 net/ipv4/af_inet.c:848
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:733 [inline]
sock_sendmsg+0x389/0x490 net/socket.c:756
__sock_xmit+0x1e8/0x4f0 drivers/block/nbd.c:574
sock_xmit drivers/block/nbd.c:602 [inline]
nbd_send_cmd+0x8ec/0x1c90 drivers/block/nbd.c:712
nbd_handle_cmd drivers/block/nbd.c:1174 [inline]
nbd_queue_rq+0x941/0x1220 drivers/block/nbd.c:1204
blk_mq_dispatch_rq_list+0x443/0x1dc0 block/blk-mq.c:2120
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline]
__blk_mq_sched_dispatch_requests+0xcdf/0x1620 block/blk-mq-sched.c:309
blk_mq_sched_dispatch_requests+0xd8/0x1b0 block/blk-mq-sched.c:331
blk_mq_run_hw_queue+0x239/0x670 block/blk-mq.c:2354
blk_mq_dispatch_plug_list block/blk-mq.c:2866 [inline]
blk_mq_flush_plug_list+0x673/0x1c60 block/blk-mq.c:2917
__blk_flush_plug+0x2c5/0x4b0 block/blk-core.c:1213
blk_finish_plug block/blk-core.c:1240 [inline]
blk_finish_plug block/blk-core.c:1237 [inline]
__submit_bio+0x547/0x690 block/blk-core.c:642
__submit_bio_noacct_mq block/blk-core.c:715 [inline]
submit_bio_noacct_nocheck+0x698/0xd70 block/blk-core.c:744
submit_bio_noacct+0x50d/0x1ec0 block/blk-core.c:867
submit_bh fs/buffer.c:2819 [inline]
block_read_full_folio+0x812/0xa50 fs/buffer.c:2446
filemap_read_folio+0xc6/0x2a0 mm/filemap.c:2390
do_read_cache_folio+0x263/0x5c0 mm/filemap.c:3960
read_mapping_folio include/linux/pagemap.h:1023 [inline]
read_part_sector+0xd4/0x310 block/partitions/core.c:722
adfspart_check_ICS+0x94/0x940 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x71f/0x1520 block/partitions/core.c:693
blkdev_get_whole+0x187/0x290 block/bdev.c:706
bdev_open+0x2c7/0xe20 block/bdev.c:915
blkdev_open+0x27b/0x3f0 block/fops.c:652
do_dentry_open+0x735/0x1c40 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3830 [inline]
path_openat+0x1e88/0x2d80 fs/namei.c:3989
do_filp_open+0x20c/0x470 fs/namei.c:4016
do_sys_openat2+0x17a/0x1e0 fs/open.c:1428
do_sys_open fs/open.c:1443 [inline]
__do_sys_openat fs/open.c:1459 [inline]
__se_sys_openat fs/open.c:1454 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1454
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&nsock->tx_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730
nbd_handle_cmd drivers/block/nbd.c:1140 [inline]
nbd_queue_rq+0x424/0x1220 drivers/block/nbd.c:1204
blk_mq_dispatch_rq_list+0x443/0x1dc0 block/blk-mq.c:2120
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline]
__blk_mq_sched_dispatch_requests+0xcdf/0x1620 block/blk-mq-sched.c:309
blk_mq_sched_dispatch_requests+0xd8/0x1b0 block/blk-mq-sched.c:331
blk_mq_run_hw_queue+0x239/0x670 block/blk-mq.c:2354
blk_mq_dispatch_plug_list block/blk-mq.c:2866 [inline]
blk_mq_flush_plug_list+0x673/0x1c60 block/blk-mq.c:2917
__blk_flush_plug+0x2c5/0x4b0 block/blk-core.c:1213
blk_finish_plug block/blk-core.c:1240 [inline]
blk_finish_plug block/blk-core.c:1237 [inline]
__submit_bio+0x547/0x690 block/blk-core.c:642
__submit_bio_noacct_mq block/blk-core.c:715 [inline]
submit_bio_noacct_nocheck+0x698/0xd70 block/blk-core.c:744
submit_bio_noacct+0x50d/0x1ec0 block/blk-core.c:867
submit_bh fs/buffer.c:2819 [inline]
block_read_full_folio+0x812/0xa50 fs/buffer.c:2446
filemap_read_folio+0xc6/0x2a0 mm/filemap.c:2390
do_read_cache_folio+0x263/0x5c0 mm/filemap.c:3960
read_mapping_folio include/linux/pagemap.h:1023 [inline]
read_part_sector+0xd4/0x310 block/partitions/core.c:722
adfspart_check_ICS+0x94/0x940 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x71f/0x1520 block/partitions/core.c:693
blkdev_get_whole+0x187/0x290 block/bdev.c:706
bdev_open+0x2c7/0xe20 block/bdev.c:915
blkdev_open+0x27b/0x3f0 block/fops.c:652
do_dentry_open+0x735/0x1c40 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3830 [inline]
path_openat+0x1e88/0x2d80 fs/namei.c:3989
do_filp_open+0x20c/0x470 fs/namei.c:4016
do_sys_openat2+0x17a/0x1e0 fs/open.c:1428
do_sys_open fs/open.c:1443 [inline]
__do_sys_openat fs/open.c:1459 [inline]
__se_sys_openat fs/open.c:1454 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1454
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&cmd->lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730
nbd_queue_rq+0xbe/0x1220 drivers/block/nbd.c:1196
blk_mq_dispatch_rq_list+0x443/0x1dc0 block/blk-mq.c:2120
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline]
__blk_mq_sched_dispatch_requests+0xcdf/0x1620 block/blk-mq-sched.c:309
blk_mq_sched_dispatch_requests+0xd8/0x1b0 block/blk-mq-sched.c:331
blk_mq_run_hw_queue+0x239/0x670 block/blk-mq.c:2354
blk_mq_dispatch_plug_list block/blk-mq.c:2866 [inline]
blk_mq_flush_plug_list+0x673/0x1c60 block/blk-mq.c:2917
__blk_flush_plug+0x2c5/0x4b0 block/blk-core.c:1213
blk_finish_plug block/blk-core.c:1240 [inline]
blk_finish_plug block/blk-core.c:1237 [inline]
__submit_bio+0x547/0x690 block/blk-core.c:642
__submit_bio_noacct_mq block/blk-core.c:715 [inline]
submit_bio_noacct_nocheck+0x698/0xd70 block/blk-core.c:744
submit_bio_noacct+0x50d/0x1ec0 block/blk-core.c:867
submit_bh fs/buffer.c:2819 [inline]
block_read_full_folio+0x812/0xa50 fs/buffer.c:2446
filemap_read_folio+0xc6/0x2a0 mm/filemap.c:2390
do_read_cache_folio+0x263/0x5c0 mm/filemap.c:3960
read_mapping_folio include/linux/pagemap.h:1023 [inline]
read_part_sector+0xd4/0x310 block/partitions/core.c:722
adfspart_check_ICS+0x94/0x940 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x71f/0x1520 block/partitions/core.c:693
blkdev_get_whole+0x187/0x290 block/bdev.c:706
bdev_open+0x2c7/0xe20 block/bdev.c:915
blkdev_open+0x27b/0x3f0 block/fops.c:652
do_dentry_open+0x735/0x1c40 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3830 [inline]
path_openat+0x1e88/0x2d80 fs/namei.c:3989
do_filp_open+0x20c/0x470 fs/namei.c:4016
do_sys_openat2+0x17a/0x1e0 fs/open.c:1428
do_sys_open fs/open.c:1443 [inline]
__do_sys_openat fs/open.c:1459 [inline]
__se_sys_openat fs/open.c:1454 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1454
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (set->srcu){.+.+}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain kernel/locking/lockdep.c:3906 [inline]
__lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228
lock_sync+0xf5/0x190 kernel/locking/lockdep.c:5899
srcu_lock_sync include/linux/srcu.h:176 [inline]
__synchronize_srcu+0xa9/0x2a0 kernel/rcu/srcutree.c:1418
blk_mq_wait_quiesce_done block/blk-mq.c:293 [inline]
blk_mq_wait_quiesce_done block/blk-mq.c:290 [inline]
blk_mq_quiesce_queue block/blk-mq.c:313 [inline]
blk_mq_quiesce_queue block/blk-mq.c:308 [inline]
blk_mq_update_nr_requests+0x288/0x670 block/blk-mq.c:4875
queue_requests_store+0x161/0x210 block/blk-sysfs.c:74
queue_attr_store+0x370/0x510 block/blk-sysfs.c:715
sysfs_kf_write+0x117/0x170 fs/sysfs/file.c:139
kernfs_fop_write_iter+0x33d/0x500 fs/kernfs/file.c:334
new_sync_write fs/read_write.c:586 [inline]
vfs_write+0x5ae/0x1150 fs/read_write.c:679
ksys_write+0x12b/0x250 fs/read_write.c:731
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
set->srcu --> mapping.invalidate_lock#2 --> &q->q_usage_counter(io)#51
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&q->q_usage_counter(io)#51);
lock(mapping.invalidate_lock#2);
lock(&q->q_usage_counter(io)#51);
sync(set->srcu);
*** DEADLOCK ***
7 locks held by syz.7.3369/20412:
#0: ffff888044885438 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x267/0x390 fs/file.c:1192
#1: ffff888035366420 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12b/0x250 fs/read_write.c:731
#2: ffff8880128ddc88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x27b/0x500 fs/kernfs/file.c:325
#3: ffff88802580bf08 (kn->active#208){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x29e/0x500 fs/kernfs/file.c:326
#4: ffff888143f91838 (&q->sysfs_lock){+.+.}-{4:4}, at: queue_attr_store+0x2c1/0x510 block/blk-sysfs.c:713
#5: ffff888143f91308 (&q->q_usage_counter(io)#51){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x15/0x20 block/blk-mq.c:215
#6: ffff888143f91340 (&q->q_usage_counter(queue)#35){+.+.}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x15/0x20 block/blk-mq.c:215
stack backtrace:
CPU: 1 UID: 0 PID: 20412 Comm: syz.7.3369 Tainted: G U 6.14.0-rc5-syzkaller-00013-g99fa936e8e4f #0
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x490/0x760 kernel/locking/lockdep.c:2076
check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2208
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain kernel/locking/lockdep.c:3906 [inline]
__lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228
lock_sync+0xf5/0x190 kernel/locking/lockdep.c:5899
srcu_lock_sync include/linux/srcu.h:176 [inline]
__synchronize_srcu+0xa9/0x2a0 kernel/rcu/srcutree.c:1418
blk_mq_wait_quiesce_done block/blk-mq.c:293 [inline]
blk_mq_wait_quiesce_done block/blk-mq.c:290 [inline]
blk_mq_quiesce_queue block/blk-mq.c:313 [inline]
blk_mq_quiesce_queue block/blk-mq.c:308 [inline]
blk_mq_update_nr_requests+0x288/0x670 block/blk-mq.c:4875
queue_requests_store+0x161/0x210 block/blk-sysfs.c:74
queue_attr_store+0x370/0x510 block/blk-sysfs.c:715
sysfs_kf_write+0x117/0x170 fs/sysfs/file.c:139
kernfs_fop_write_iter+0x33d/0x500 fs/kernfs/file.c:334
new_sync_write fs/read_write.c:586 [inline]
vfs_write+0x5ae/0x1150 fs/read_write.c:679
ksys_write+0x12b/0x250 fs/read_write.c:731
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0db658d169
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:00007f0db749b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f0db67a5fa0 RCX: 00007f0db658d169
RDX: 0000000000000008 RSI: 0000400000000000 RDI: 0000000000000002
RBP: 00007f0db660e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0db67a5fa0 R15: 00007fffadee3868
</TASK>