====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc1-syzkaller-00203-g4774cfe3543a #0 Not tainted ------------------------------------------------------ syz.2.105/6377 is trying to acquire lock: ffffffff8e72ec28 (pcpu_alloc_mutex){+.+.}-{4:4}, at: pcpu_alloc_noprof+0xb4c/0x1470 mm/percpu.c:1782 but task is already holding lock: ffff888142b26278 (&q->q_usage_counter(io)#51){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave block/blk-mq.c:205 [inline] ffff888142b26278 (&q->q_usage_counter(io)#51){++++}-{0:0}, at: __blk_mq_update_nr_hw_queues block/blk-mq.c:4993 [inline] ffff888142b26278 (&q->q_usage_counter(io)#51){++++}-{0:0}, at: blk_mq_update_nr_hw_queues+0x275/0xcb0 block/blk-mq.c:5043 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&q->q_usage_counter(io)#51){++++}-{0:0}: blk_alloc_queue+0x619/0x760 block/blk-core.c:461 blk_mq_alloc_queue+0x175/0x290 block/blk-mq.c:4396 __blk_mq_alloc_disk+0x29/0x120 block/blk-mq.c:4443 nbd_dev_add+0x4a0/0xbc0 drivers/block/nbd.c:1933 nbd_init+0x181/0x320 drivers/block/nbd.c:2670 do_one_initcall+0x123/0x6e0 init/main.c:1273 do_initcall_level init/main.c:1335 [inline] do_initcalls init/main.c:1351 [inline] do_basic_setup init/main.c:1370 [inline] kernel_init_freeable+0x5c2/0x900 init/main.c:1583 kernel_init+0x1c/0x2b0 init/main.c:1473 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #1 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:4045 [inline] fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:4059 might_alloc include/linux/sched/mm.h:318 [inline] prepare_alloc_pages+0x162/0x610 mm/page_alloc.c:4727 __alloc_frozen_pages_noprof+0x18b/0x23f0 mm/page_alloc.c:4948 __alloc_pages_noprof+0xb/0x1b0 mm/page_alloc.c:4993 __alloc_pages_node_noprof include/linux/gfp.h:284 [inline] alloc_pages_node_noprof include/linux/gfp.h:311 [inline] pcpu_alloc_pages mm/percpu-vm.c:95 [inline] pcpu_populate_chunk+0x110/0xb00 mm/percpu-vm.c:285 pcpu_alloc_noprof+0x86a/0x1470 mm/percpu.c:1870 xt_percpu_counter_alloc+0x13e/0x1b0 net/netfilter/x_tables.c:1931 find_check_entry.constprop.0+0xbf/0xa20 net/ipv6/netfilter/ip6_tables.c:545 translate_table+0xd0b/0x17b0 net/ipv6/netfilter/ip6_tables.c:733 ip6t_register_table+0x102/0x430 net/ipv6/netfilter/ip6_tables.c:1751 ip6table_filter_table_init+0x75/0xa0 net/ipv6/netfilter/ip6table_filter.c:48 xt_find_table_lock+0x2e4/0x520 net/netfilter/x_tables.c:1260 xt_request_find_table_lock+0x28/0xf0 net/netfilter/x_tables.c:1285 get_info+0x19c/0x7d0 net/ipv4/netfilter/arp_tables.c:808 do_ip6t_get_ctl+0x169/0xae0 net/ipv6/netfilter/ip6_tables.c:1668 nf_getsockopt+0x7c/0xe0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x1f7/0x280 net/ipv6/ipv6_sockglue.c:1493 tcp_getsockopt+0xa1/0x100 net/ipv4/tcp.c:4760 do_sock_getsockopt+0x3ff/0x800 net/socket.c:2357 __sys_getsockopt+0x12f/0x260 net/socket.c:2386 __do_sys_getsockopt net/socket.c:2393 [inline] __se_sys_getsockopt net/socket.c:2390 [inline] __x64_sys_getsockopt+0xbd/0x160 net/socket.c:2390 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (pcpu_alloc_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 pcpu_alloc_noprof+0xb4c/0x1470 mm/percpu.c:1782 init_alloc_hint lib/sbitmap.c:16 [inline] sbitmap_init_node+0x2fd/0x770 lib/sbitmap.c:126 sbitmap_queue_init_node+0x41/0x560 lib/sbitmap.c:438 bt_alloc block/blk-mq-tag.c:542 [inline] blk_mq_init_tags+0x12d/0x2b0 block/blk-mq-tag.c:565 blk_mq_alloc_rq_map block/blk-mq.c:3538 [inline] blk_mq_alloc_map_and_rqs+0x237/0xf60 block/blk-mq.c:4094 __blk_mq_alloc_map_and_rqs block/blk-mq.c:4116 [inline] __blk_mq_alloc_map_and_rqs+0x128/0x1f0 block/blk-mq.c:4107 blk_mq_realloc_tag_set_tags block/blk-mq.c:4755 [inline] __blk_mq_update_nr_hw_queues block/blk-mq.c:4995 [inline] blk_mq_update_nr_hw_queues+0x4ab/0xcb0 block/blk-mq.c:5043 nbd_start_device+0x172/0xcd0 drivers/block/nbd.c:1476 nbd_start_device_ioctl drivers/block/nbd.c:1527 [inline] __nbd_ioctl drivers/block/nbd.c:1602 [inline] nbd_ioctl+0x219/0xda0 drivers/block/nbd.c:1642 blkdev_ioctl+0x277/0x6d0 block/ioctl.c:704 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: pcpu_alloc_mutex --> fs_reclaim --> &q->q_usage_counter(io)#51 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&q->q_usage_counter(io)#51); lock(fs_reclaim); lock(&q->q_usage_counter(io)#51); lock(pcpu_alloc_mutex); *** DEADLOCK *** 5 locks held by syz.2.105/6377: #0: ffff88802694da30 (&nbd->config_lock){+.+.}-{4:4}, at: nbd_ioctl+0x150/0xda0 drivers/block/nbd.c:1635 #1: ffff88802694d988 (&set->update_nr_hwq_lock){++++}-{4:4}, at: blk_mq_update_nr_hw_queues+0x32/0xcb0 block/blk-mq.c:5041 #2: ffff88802694d8d8 (&set->tag_list_lock){+.+.}-{4:4}, at: blk_mq_update_nr_hw_queues+0x45/0xcb0 block/blk-mq.c:5042 #3: ffff888142b26278 (&q->q_usage_counter(io)#51){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave block/blk-mq.c:205 [inline] #3: ffff888142b26278 (&q->q_usage_counter(io)#51){++++}-{0:0}, at: __blk_mq_update_nr_hw_queues block/blk-mq.c:4993 [inline] #3: ffff888142b26278 (&q->q_usage_counter(io)#51){++++}-{0:0}, at: blk_mq_update_nr_hw_queues+0x275/0xcb0 block/blk-mq.c:5043 #4: ffff888142b262b0 (&q->q_usage_counter(queue)#3){+.+.}-{0:0}, at: blk_mq_freeze_queue_nomemsave block/blk-mq.c:205 [inline] #4: ffff888142b262b0 (&q->q_usage_counter(queue)#3){+.+.}-{0:0}, at: __blk_mq_update_nr_hw_queues block/blk-mq.c:4993 [inline] #4: ffff888142b262b0 (&q->q_usage_counter(queue)#3){+.+.}-{0:0}, at: blk_mq_update_nr_hw_queues+0x275/0xcb0 block/blk-mq.c:5043 stack backtrace: CPU: 0 UID: 0 PID: 6377 Comm: syz.2.105 Not tainted 6.16.0-rc1-syzkaller-00203-g4774cfe3543a #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2046 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 pcpu_alloc_noprof+0xb4c/0x1470 mm/percpu.c:1782 init_alloc_hint lib/sbitmap.c:16 [inline] sbitmap_init_node+0x2fd/0x770 lib/sbitmap.c:126 sbitmap_queue_init_node+0x41/0x560 lib/sbitmap.c:438 bt_alloc block/blk-mq-tag.c:542 [inline] blk_mq_init_tags+0x12d/0x2b0 block/blk-mq-tag.c:565 blk_mq_alloc_rq_map block/blk-mq.c:3538 [inline] blk_mq_alloc_map_and_rqs+0x237/0xf60 block/blk-mq.c:4094 __blk_mq_alloc_map_and_rqs block/blk-mq.c:4116 [inline] __blk_mq_alloc_map_and_rqs+0x128/0x1f0 block/blk-mq.c:4107 blk_mq_realloc_tag_set_tags block/blk-mq.c:4755 [inline] __blk_mq_update_nr_hw_queues block/blk-mq.c:4995 [inline] blk_mq_update_nr_hw_queues+0x4ab/0xcb0 block/blk-mq.c:5043 nbd_start_device+0x172/0xcd0 drivers/block/nbd.c:1476 nbd_start_device_ioctl drivers/block/nbd.c:1527 [inline] __nbd_ioctl drivers/block/nbd.c:1602 [inline] nbd_ioctl+0x219/0xda0 drivers/block/nbd.c:1642 blkdev_ioctl+0x277/0x6d0 block/ioctl.c:704 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb7bc38e929 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:00007fb7ba1d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb7bc5b6080 RCX: 00007fb7bc38e929 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 00007fb7bc410b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb7bc5b6080 R15: 00007ffcb1e2a5e8 block nbd2: shutting down sockets