====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.4946/24451 is trying to acquire lock: ffff88807d5b6418 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412 but task is already holding lock: ffff88801dbf8870 (&subsys->lock){+.+.}-{3:3}, at: nvmet_ns_enable+0x4d/0x8c0 drivers/nvme/target/core.c:561 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (&subsys->lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747 nvmet_ns_device_path_store+0x54/0x150 drivers/nvme/target/configfs.c:350 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x312/0x400 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x474/0x9a0 fs/read_write.c:584 ksys_write+0x151/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #5 (&p->frag_sem){.+.+}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 fill_read_buffer fs/configfs/file.c:66 [inline] configfs_read_iter+0x1a5/0x570 fs/configfs/file.c:88 __kernel_read+0x2e5/0x730 fs/read_write.c:428 integrity_kernel_read+0x8a/0xd0 security/integrity/iint.c:221 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline] ima_calc_file_hash+0xb1f/0x1960 security/integrity/ima/ima_crypto.c:573 ima_collect_measurement+0x4d4/0xa30 security/integrity/ima/ima_api.c:290 process_measurement+0x123a/0x1d50 security/integrity/ima/ima_main.c:370 ima_file_check+0xcc/0x110 security/integrity/ima/ima_main.c:568 do_open fs/namei.c:3685 [inline] path_openat+0x2910/0x3270 fs/namei.c:3844 do_filp_open+0x1f2/0x430 fs/namei.c:3871 do_sys_openat2+0x134/0x1d0 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1448 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #4 (&buffer->mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747 configfs_read_iter+0x72/0x570 fs/configfs/file.c:86 __kernel_read+0x2e5/0x730 fs/read_write.c:428 integrity_kernel_read+0x8a/0xd0 security/integrity/iint.c:221 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline] ima_calc_file_hash+0xb1f/0x1960 security/integrity/ima/ima_crypto.c:573 ima_collect_measurement+0x4d4/0xa30 security/integrity/ima/ima_api.c:290 process_measurement+0x123a/0x1d50 security/integrity/ima/ima_main.c:370 ima_file_check+0xcc/0x110 security/integrity/ima/ima_main.c:568 do_open fs/namei.c:3685 [inline] path_openat+0x2910/0x3270 fs/namei.c:3844 do_filp_open+0x1f2/0x430 fs/namei.c:3871 do_sys_openat2+0x134/0x1d0 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1448 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #3 (&iint_mutex_key[depth]){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747 process_measurement+0x739/0x1d50 security/integrity/ima/ima_main.c:275 ima_file_check+0xcc/0x110 security/integrity/ima/ima_main.c:568 do_open fs/namei.c:3685 [inline] path_openat+0x2910/0x3270 fs/namei.c:3844 do_file_open_root+0x2f3/0x5a0 fs/namei.c:3896 file_open_root+0x167/0x1c0 fs/open.c:1402 kernel_read_file_from_path_initns+0x151/0x230 fs/kernel_read_file.c:163 fw_get_filesystem_firmware drivers/base/firmware_loader/main.c:548 [inline] _request_firmware+0xb43/0x1520 drivers/base/firmware_loader/main.c:911 request_firmware+0x36/0x50 drivers/base/firmware_loader/main.c:987 reg_reload_regdb+0x9a/0x490 net/wireless/reg.c:1078 genl_family_rcv_msg_doit+0x21a/0x310 net/netlink/genetlink.c:971 genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline] genl_rcv_msg+0x611/0x7a0 net/netlink/genetlink.c:1066 netlink_rcv_skb+0x235/0x4c0 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1075 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x7b1/0x930 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1899 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x61b/0x980 net/socket.c:2595 ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2687 [inline] __se_sys_sendmsg+0x1d0/0x2c0 net/socket.c:2685 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #2 (cb_lock){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 genl_rcv+0x19/0x40 net/netlink/genetlink.c:1074 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x7b1/0x930 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1899 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] sock_sendmsg+0x23b/0x3a0 net/socket.c:768 splice_to_socket+0xb92/0x1270 fs/splice.c:881 do_splice_from fs/splice.c:933 [inline] do_splice+0xe45/0x1b20 fs/splice.c:1292 __do_splice fs/splice.c:1370 [inline] __do_sys_splice fs/splice.c:1586 [inline] __se_sys_splice+0x398/0x4a0 fs/splice.c:1568 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&pipe->mutex/1){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747 iter_file_splice_write+0x1ba/0xcf0 fs/splice.c:683 do_splice_from fs/splice.c:933 [inline] do_splice+0xe45/0x1b20 fs/splice.c:1292 __do_splice fs/splice.c:1370 [inline] __do_sys_splice fs/splice.c:1586 [inline] __se_sys_splice+0x398/0x4a0 fs/splice.c:1568 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (sb_writers#5){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1633 [inline] sb_start_write+0x4d/0x1c0 include/linux/fs.h:1708 mnt_want_write+0x41/0x90 fs/namespace.c:412 open_last_lookups fs/namei.c:3596 [inline] path_openat+0x768/0x3270 fs/namei.c:3841 do_filp_open+0x1f2/0x430 fs/namei.c:3871 file_open_name fs/open.c:1367 [inline] filp_open+0x180/0x1e0 fs/open.c:1387 nvmet_file_ns_enable+0x74/0x330 drivers/nvme/target/io-cmd-file.c:41 nvmet_ns_enable+0xf4/0x8c0 drivers/nvme/target/core.c:578 nvmet_ns_enable_store+0xd8/0x170 drivers/nvme/target/configfs.c:549 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x312/0x400 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x474/0x9a0 fs/read_write.c:584 ksys_write+0x151/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: sb_writers#5 --> &p->frag_sem --> &subsys->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&subsys->lock); lock(&p->frag_sem); lock(&subsys->lock); rlock(sb_writers#5); *** DEADLOCK *** 6 locks held by syz.5.4946/24451: #0: ffff88807d78ed48 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2a3/0x330 fs/file.c:1040 #1: ffff8880187b2418 (sb_writers#20){.+.+}-{0:0}, at: vfs_write+0x21e/0x9a0 fs/read_write.c:580 #2: ffff888067ff3288 (&buffer->mutex){+.+.}-{3:3}, at: configfs_write_iter+0x81/0x400 fs/configfs/file.c:226 #3: ffff88802fa54878 (&p->frag_sem){.+.+}-{3:3}, at: flush_write_buffer fs/configfs/file.c:205 [inline] #3: ffff88802fa54878 (&p->frag_sem){.+.+}-{3:3}, at: configfs_write_iter+0x215/0x400 fs/configfs/file.c:229 #4: ffffffff8daef0f0 (nvmet_config_sem){+.+.}-{3:3}, at: nvmet_ns_enable_store+0xc9/0x170 drivers/nvme/target/configfs.c:547 #5: ffff88801dbf8870 (&subsys->lock){+.+.}-{3:3}, at: nvmet_ns_enable+0x4d/0x8c0 drivers/nvme/target/core.c:561 stack backtrace: CPU: 0 PID: 24451 Comm: syz.5.4946 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1633 [inline] sb_start_write+0x4d/0x1c0 include/linux/fs.h:1708 mnt_want_write+0x41/0x90 fs/namespace.c:412 open_last_lookups fs/namei.c:3596 [inline] path_openat+0x768/0x3270 fs/namei.c:3841 do_filp_open+0x1f2/0x430 fs/namei.c:3871 file_open_name fs/open.c:1367 [inline] filp_open+0x180/0x1e0 fs/open.c:1387 nvmet_file_ns_enable+0x74/0x330 drivers/nvme/target/io-cmd-file.c:41 nvmet_ns_enable+0xf4/0x8c0 drivers/nvme/target/core.c:578 nvmet_ns_enable_store+0xd8/0x170 drivers/nvme/target/configfs.c:549 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x312/0x400 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x474/0x9a0 fs/read_write.c:584 ksys_write+0x151/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3ffc19e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3ffd05a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f3ffc425fa0 RCX: 00007f3ffc19e0d9 RDX: 0000000000000001 RSI: 0000200000000300 RDI: 0000000000000007 RBP: 00007f3ffc235024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3ffc426038 R14: 00007f3ffc425fa0 R15: 00007ffc5c31f3c8 nvmet: failed to open file ./fi: (-2)