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Wed, 24 Sep 2025 20:11:29 -0700 (PDT) Date: Wed, 24 Sep 2025 20:11:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68d4b2e1.050a0220.57ae1.0037.GAE@google.com> Subject: [syzbot] [bpf?] [net?] possible deadlock in xdp_umem_pin_pages From: syzbot To: akpm@linux-foundation.org, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, david@redhat.com, jgg@ziepe.ca, jhubbard@nvidia.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, peterx@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 7E947100012 X-Stat-Signature: yyhm1f7qawwc9fxxhkf3i141y95hr5e6 X-HE-Tag: 1758769890-908680 X-HE-Meta: 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 feUssk2u 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 C74zf1kk OzOawjn/Xh5Mup2Py2EnAT2S2yP7fFNS1/EMo3+gHKHMUdGl3VGI4qtfsgeyhuaTniABBg+H0VbrRGT7JJuRy6+o7P1//4RarD0SkdQPY4kfpthW1Tk4D94ukF+vahL4K28sR7d5wqnlbMddjgi1qg2OyDtXESZT8P2Wu1UQDWKcvcMxhXqYwpX0CqavpXfRSRvW0Idkej2z4y4MUNxtHpgkksK5d60TiWaECv2qAHWRva3QrmL2Nq6YywLE4S5uP269OFsOM5s6X3iYDvoAVBbLHXMLL9r6AZD+yLk3rxrOvQS7D1M9R0sxRTL21MqaFJbKKkoRuiZ3DoizgmXwbK70LwssXGDv6po62a0o0nnUcdPvFnC7oVp1A1OuB4PEI3ICBAnUYT9QDlJCSmZ2LjdecRQg14kqFTjUTCqcTRZpSvu4FzeeXMdrmc64RYHioapUiVABXMO8URfJzirW/WwdjqR0QK8N+Ri2vK1B0t81I05B1dIG9YXC6CgAgh25 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: b5a4da2c459f Add linux-next specific files for 20250924 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17d3cce2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=841973c5ab4f4157 dashboard link: https://syzkaller.appspot.com/bug?extid=1b607ee7794bdba65be7 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2d0e39514585/disk-b5a4da2c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c7c8001fe2ea/vmlinux-b5a4da2c.xz kernel image: https://storage.googleapis.com/syzbot-assets/807bea872f12/bzImage-b5a4da2c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1b607ee7794bdba65be7@syzkaller.appspotmail.com ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.7937/23579 is trying to acquire lock: ffff88802981d0e8 (&resv_map->rw_sema){++++}-{4:4}, at: follow_page_mask mm/gup.c:1015 [inline] ffff88802981d0e8 (&resv_map->rw_sema){++++}-{4:4}, at: __get_user_pages+0x5da/0x2a00 mm/gup.c:1426 but task is already holding lock: ffff888028e401e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:368 [inline] ffff888028e401e0 (&mm->mmap_lock){++++}-{4:4}, at: xdp_umem_pin_pages+0xcb/0x350 net/xdp/xdp_umem.c:104 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #8 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __might_fault+0xcc/0x130 mm/memory.c:7125 _copy_from_iter+0xf3/0x1790 lib/iov_iter.c:259 copy_from_iter include/linux/uio.h:228 [inline] copy_from_iter_full include/linux/uio.h:245 [inline] skb_do_copy_data_nocache include/net/sock.h:2269 [inline] skb_copy_to_page_nocache include/net/sock.h:2295 [inline] tcp_sendmsg_locked+0x2347/0x5540 net/ipv4/tcp.c:1272 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1413 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x19c/0x270 net/socket.c:729 sock_write_iter+0x279/0x360 net/socket.c:1182 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #7 (sk_lock-AF_INET){+.+.}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 lock_sock_nested+0x48/0x100 net/core/sock.c:3720 lock_sock include/net/sock.h:1679 [inline] inet_shutdown+0x6a/0x390 net/ipv4/af_inet.c:907 nbd_mark_nsock_dead+0x2e9/0x560 drivers/block/nbd.c:318 sock_shutdown+0x15e/0x260 drivers/block/nbd.c:411 nbd_clear_sock drivers/block/nbd.c:1424 [inline] nbd_config_put+0x342/0x790 drivers/block/nbd.c:1448 nbd_release+0xfe/0x140 drivers/block/nbd.c:1753 bdev_release+0x536/0x650 block/bdev.c:-1 blkdev_release+0x15/0x20 block/fops.c:702 __fput+0x44c/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #6 (&nsock->tx_lock){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:760 nbd_handle_cmd drivers/block/nbd.c:1140 [inline] nbd_queue_rq+0x257/0xf10 drivers/block/nbd.c:1204 blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2129 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline] __blk_mq_sched_dispatch_requests+0xda4/0x1570 block/blk-mq-sched.c:307 blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329 blk_mq_run_hw_queue+0x348/0x4f0 block/blk-mq.c:2367 blk_mq_dispatch_list+0xd0c/0xe00 include/linux/spinlock.h:-1 blk_mq_flush_plug_list+0x469/0x550 block/blk-mq.c:2976 __blk_flush_plug+0x3d3/0x4b0 block/blk-core.c:1225 blk_finish_plug block/blk-core.c:1252 [inline] __submit_bio+0x2d3/0x5a0 block/blk-core.c:651 __submit_bio_noacct_mq block/blk-core.c:724 [inline] submit_bio_noacct_nocheck+0x2fb/0xa50 block/blk-core.c:755 submit_bh fs/buffer.c:2829 [inline] block_read_full_folio+0x599/0x830 fs/buffer.c:2447 filemap_read_folio+0x117/0x380 mm/filemap.c:2444 do_read_cache_folio+0x350/0x590 mm/filemap.c:4009 read_mapping_folio include/linux/pagemap.h:999 [inline] read_part_sector+0xb6/0x2b0 block/partitions/core.c:722 adfspart_check_ICS+0xa4/0xa50 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+0x75f/0x14b0 block/partitions/core.c:693 blkdev_get_whole+0x380/0x510 block/bdev.c:748 bdev_open+0x31e/0xd30 block/bdev.c:957 blkdev_open+0x457/0x600 block/fops.c:694 do_dentry_open+0x953/0x13f0 fs/open.c:965 vfs_open+0x3b/0x340 fs/open.c:1097 do_open fs/namei.c:3975 [inline] path_openat+0x2ee5/0x3830 fs/namei.c:4134 do_filp_open+0x1fa/0x410 fs/namei.c:4161 do_sys_openat2+0x121/0x1c0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #5 (&cmd->lock){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:760 nbd_queue_rq+0xc8/0xf10 drivers/block/nbd.c:1196 blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2129 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline] __blk_mq_sched_dispatch_requests+0xda4/0x1570 block/blk-mq-sched.c:307 blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329 blk_mq_run_hw_queue+0x348/0x4f0 block/blk-mq.c:2367 blk_mq_dispatch_list+0xd0c/0xe00 include/linux/spinlock.h:-1 blk_mq_flush_plug_list+0x469/0x550 block/blk-mq.c:2976 __blk_flush_plug+0x3d3/0x4b0 block/blk-core.c:1225 blk_finish_plug block/blk-core.c:1252 [inline] __submit_bio+0x2d3/0x5a0 block/blk-core.c:651 __submit_bio_noacct_mq block/blk-core.c:724 [inline] submit_bio_noacct_nocheck+0x2fb/0xa50 block/blk-core.c:755 submit_bh fs/buffer.c:2829 [inline] block_read_full_folio+0x599/0x830 fs/buffer.c:2447 filemap_read_folio+0x117/0x380 mm/filemap.c:2444 do_read_cache_folio+0x350/0x590 mm/filemap.c:4009 read_mapping_folio include/linux/pagemap.h:999 [inline] read_part_sector+0xb6/0x2b0 block/partitions/core.c:722 adfspart_check_ICS+0xa4/0xa50 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+0x75f/0x14b0 block/partitions/core.c:693 blkdev_get_whole+0x380/0x510 block/bdev.c:748 bdev_open+0x31e/0xd30 block/bdev.c:957 blkdev_open+0x457/0x600 block/fops.c:694 do_dentry_open+0x953/0x13f0 fs/open.c:965 vfs_open+0x3b/0x340 fs/open.c:1097 do_open fs/namei.c:3975 [inline] path_openat+0x2ee5/0x3830 fs/namei.c:4134 do_filp_open+0x1fa/0x410 fs/namei.c:4161 do_sys_openat2+0x121/0x1c0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #4 (set->srcu){.+.+}-{0:0}: lock_sync+0xba/0x160 kernel/locking/lockdep.c:5916 srcu_lock_sync include/linux/srcu.h:173 [inline] __synchronize_srcu+0x96/0x3a0 kernel/rcu/srcutree.c:1429 elevator_switch+0x12b/0x640 block/elevator.c:588 elevator_change+0x315/0x4c0 block/elevator.c:691 elevator_set_default+0x186/0x260 block/elevator.c:767 blk_register_queue+0x34e/0x3f0 block/blk-sysfs.c:942 __add_disk+0x677/0xd50 block/genhd.c:528 add_disk_fwnode+0xfc/0x480 block/genhd.c:597 add_disk include/linux/blkdev.h:775 [inline] nbd_dev_add+0x717/0xae0 drivers/block/nbd.c:1981 nbd_init+0x168/0x1f0 drivers/block/nbd.c:2688 do_one_initcall+0x236/0x820 init/main.c:1283 do_initcall_level+0x104/0x190 init/main.c:1345 do_initcalls+0x59/0xa0 init/main.c:1361 kernel_init_freeable+0x334/0x4b0 init/main.c:1593 kernel_init+0x1d/0x1d0 init/main.c:1483 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #3 (&q->elevator_lock){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:760 elevator_change+0x1e5/0x4c0 block/elevator.c:689 elevator_set_none+0x42/0xb0 block/elevator.c:782 blk_mq_elv_switch_none block/blk-mq.c:5032 [inline] __blk_mq_update_nr_hw_queues block/blk-mq.c:5075 [inline] blk_mq_update_nr_hw_queues+0x598/0x1ab0 block/blk-mq.c:5133 nbd_start_device+0x17f/0xb10 drivers/block/nbd.c:1486 nbd_genl_connect+0x135b/0x18f0 drivers/block/nbd.c:2236 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2617 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2671 __sys_sendmsg net/socket.c:2703 [inline] __do_sys_sendmsg net/socket.c:2708 [inline] __se_sys_sendmsg net/socket.c:2706 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2706 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&q->q_usage_counter(io)#49){++++}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 blk_alloc_queue+0x538/0x620 block/blk-core.c:461 blk_mq_alloc_queue block/blk-mq.c:4399 [inline] __blk_mq_alloc_disk+0x15c/0x340 block/blk-mq.c:4446 nbd_dev_add+0x46c/0xae0 drivers/block/nbd.c:1951 nbd_init+0x168/0x1f0 drivers/block/nbd.c:2688 do_one_initcall+0x236/0x820 init/main.c:1283 do_initcall_level+0x104/0x190 init/main.c:1345 do_initcalls+0x59/0xa0 init/main.c:1361 kernel_init_freeable+0x334/0x4b0 init/main.c:1593 kernel_init+0x1d/0x1d0 init/main.c:1483 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #1 (fs_reclaim){+.+.}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __fs_reclaim_acquire mm/page_alloc.c:4269 [inline] fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4283 might_alloc include/linux/sched/mm.h:318 [inline] prepare_alloc_pages+0x153/0x610 mm/page_alloc.c:4951 __alloc_frozen_pages_noprof+0x123/0x370 mm/page_alloc.c:5172 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline] alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2507 pagetable_alloc_noprof include/linux/mm.h:2990 [inline] __pud_alloc_one_noprof include/asm-generic/pgalloc.h:177 [inline] pud_alloc_one_noprof include/asm-generic/pgalloc.h:198 [inline] __pud_alloc+0x3f/0x450 mm/memory.c:6593 pud_alloc include/linux/mm.h:2941 [inline] huge_pte_alloc+0x4dc/0x620 mm/hugetlb.c:7679 hugetlb_fault+0x508/0x2970 mm/hugetlb.c:6720 handle_mm_fault+0x740/0x8e0 mm/memory.c:6529 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x165c/0x2a00 mm/gup.c:1428 populate_vma_page_range+0x29f/0x3a0 mm/gup.c:1860 __mm_populate+0x24c/0x380 mm/gup.c:1963 mm_populate include/linux/mm.h:3481 [inline] vm_mmap_pgoff+0x387/0x4d0 mm/util.c:585 ksys_mmap_pgoff+0x587/0x760 mm/mmap.c:604 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&resv_map->rw_sema){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1537 follow_page_mask mm/gup.c:1015 [inline] __get_user_pages+0x5da/0x2a00 mm/gup.c:1426 __get_user_pages_locked mm/gup.c:1692 [inline] __gup_longterm_locked+0x3dc/0x1660 mm/gup.c:2481 pin_user_pages+0x9e/0xd0 mm/gup.c:3394 xdp_umem_pin_pages+0x11c/0x350 net/xdp/xdp_umem.c:105 xdp_umem_reg net/xdp/xdp_umem.c:230 [inline] xdp_umem_create+0x677/0x8e0 net/xdp/xdp_umem.c:263 xsk_setsockopt+0x7b0/0x8d0 net/xdp/xsk.c:1484 do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2347 __sys_setsockopt net/socket.c:2372 [inline] __do_sys_setsockopt net/socket.c:2378 [inline] __se_sys_setsockopt net/socket.c:2375 [inline] __x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2375 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 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: &resv_map->rw_sema --> sk_lock-AF_INET --> &mm->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&mm->mmap_lock); lock(sk_lock-AF_INET); lock(&mm->mmap_lock); rlock(&resv_map->rw_sema); *** DEADLOCK *** 2 locks held by syz.5.7937/23579: #0: ffff888078c706b8 (&xs->mutex){+.+.}-{4:4}, at: xsk_setsockopt+0x63c/0x8d0 net/xdp/xsk.c:1478 #1: ffff888028e401e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:368 [inline] #1: ffff888028e401e0 (&mm->mmap_lock){++++}-{4:4}, at: xdp_umem_pin_pages+0xcb/0x350 net/xdp/xdp_umem.c:104 stack backtrace: CPU: 0 UID: 0 PID: 23579 Comm: syz.5.7937 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1537 follow_page_mask mm/gup.c:1015 [inline] __get_user_pages+0x5da/0x2a00 mm/gup.c:1426 __get_user_pages_locked mm/gup.c:1692 [inline] __gup_longterm_locked+0x3dc/0x1660 mm/gup.c:2481 pin_user_pages+0x9e/0xd0 mm/gup.c:3394 xdp_umem_pin_pages+0x11c/0x350 net/xdp/xdp_umem.c:105 xdp_umem_reg net/xdp/xdp_umem.c:230 [inline] xdp_umem_create+0x677/0x8e0 net/xdp/xdp_umem.c:263 xsk_setsockopt+0x7b0/0x8d0 net/xdp/xsk.c:1484 do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2347 __sys_setsockopt net/socket.c:2372 [inline] __do_sys_setsockopt net/socket.c:2378 [inline] __se_sys_setsockopt net/socket.c:2375 [inline] __x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2375 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa2d038eec9 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:00007fa2d11fd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fa2d05e5fa0 RCX: 00007fa2d038eec9 RDX: 0000000000000004 RSI: 000000000000011b RDI: 0000000000000003 RBP: 00007fa2d0411f91 R08: 0000000000000020 R09: 0000000000000000 R10: 00002000000000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa2d05e6038 R14: 00007fa2d05e5fa0 R15: 00007ffd6dae5908 --- 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@googlegroups.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