====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc5-syzkaller-00013-g99fa936e8e4f #0 Tainted: G U ------------------------------------------------------ syz.1.2700/15913 is trying to acquire lock: ffff88814130cd10 (set->srcu){.+.+}-{0:0}, at: srcu_lock_sync include/linux/srcu.h:176 [inline] ffff88814130cd10 (set->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x99/0x2a0 kernel/rcu/srcutree.c:1418 but task is already holding lock: ffff888025b5dc88 (&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] page_cache_ra_unbounded+0x173/0x7d0 mm/readahead.c:229 do_page_cache_ra mm/readahead.c:328 [inline] page_cache_ra_order+0x9cd/0xd00 mm/readahead.c:533 page_cache_async_ra+0x645/0x930 mm/readahead.c:701 do_async_mmap_readahead mm/filemap.c:3292 [inline] filemap_fault+0xf38/0x2ca0 mm/filemap.c:3433 __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 __get_user_pages_locked mm/gup.c:1757 [inline] get_dump_page+0xff/0x230 mm/gup.c:2275 dump_user_range+0x135/0x8c0 fs/coredump.c:943 elf_core_dump+0x287c/0x3a50 fs/binfmt_elf.c:2129 do_coredump+0x3134/0x4400 fs/coredump.c:758 get_signal+0x230b/0x26c0 kernel/signal.c:3021 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 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.1.2700/15913: #0: ffff88805bc300f8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x267/0x390 fs/file.c:1192 #1: ffff8880317a4420 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12b/0x250 fs/read_write.c:731 #2: ffff888062fa7c88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x27b/0x500 fs/kernfs/file.c:325 #3: ffff888025bb2f08 (kn->active#243){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x29e/0x500 fs/kernfs/file.c:326 #4: ffff888025b5e1b8 (&q->sysfs_lock){+.+.}-{4:4}, at: queue_attr_store+0x2c1/0x510 block/blk-sysfs.c:713 #5: ffff888025b5dc88 (&q->q_usage_counter(io)#51){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x15/0x20 block/blk-mq.c:215 #6: ffff888025b5dcc0 (&q->q_usage_counter(queue)#35){+.+.}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x15/0x20 block/blk-mq.c:215 stack backtrace: CPU: 0 UID: 0 PID: 15913 Comm: syz.1.2700 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: __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: 0033:0x7f2c1e18d169 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:00007f2c1efba038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f2c1e3a5fa0 RCX: 00007f2c1e18d169 RDX: 0000000000000008 RSI: 0000400000000000 RDI: 0000000000000002 RBP: 00007f2c1e20e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2c1e3a5fa0 R15: 00007ffc08923258