====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.6.769/8247 is trying to acquire lock: ffff0000dd383798 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: process_measurement+0x5b4/0x17d4 security/integrity/ima/ima_main.c:319 but task is already holding lock: ffff0000f5ca1068 (&subsys->lock#2){+.+.}-{4:4}, at: nvmet_ns_enable+0x58/0x4f0 drivers/nvme/target/core.c:583 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&subsys->lock#2){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x164/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 nvmet_ns_device_path_store+0x5c/0x14c drivers/nvme/target/configfs.c:536 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x27c/0x354 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:738 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:757 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 -> #2 (&p->frag_sem){.+.+}-{4:4}: down_read+0x58/0x2bc kernel/locking/rwsem.c:1574 fill_read_buffer fs/configfs/file.c:66 [inline] configfs_read_iter+0x18c/0x508 fs/configfs/file.c:88 __kernel_read+0x3b4/0x7cc fs/read_write.c:532 integrity_kernel_read+0x9c/0xe4 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:222 [inline] ima_calc_file_hash+0x34c/0x5cc security/integrity/ima/ima_crypto.c:280 ima_collect_measurement+0x420/0x874 security/integrity/ima/ima_api.c:300 process_measurement+0xe64/0x17d4 security/integrity/ima/ima_main.c:425 ima_file_check+0xd0/0x11c security/integrity/ima/ima_main.c:685 security_file_post_open+0x94/0x280 security/security.c:2755 do_open fs/namei.c:4702 [inline] path_openat+0x2238/0x2a60 fs/namei.c:4863 do_file_open+0x1c8/0x2e8 fs/namei.c:4892 do_sys_openat2+0x114/0x1e8 fs/open.c:1368 do_sys_open+0xb0/0xe0 fs/open.c:1374 __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __arm64_sys_openat+0xa8/0xc4 fs/open.c:1385 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:738 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:757 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 -> #1 (&buffer->mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x164/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 configfs_read_iter+0x78/0x508 fs/configfs/file.c:86 __kernel_read+0x3b4/0x7cc fs/read_write.c:532 integrity_kernel_read+0x9c/0xe4 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:222 [inline] ima_calc_file_hash+0x34c/0x5cc security/integrity/ima/ima_crypto.c:280 ima_collect_measurement+0x420/0x874 security/integrity/ima/ima_api.c:300 process_measurement+0xe64/0x17d4 security/integrity/ima/ima_main.c:425 ima_file_check+0xd0/0x11c security/integrity/ima/ima_main.c:685 security_file_post_open+0x94/0x280 security/security.c:2755 do_open fs/namei.c:4702 [inline] path_openat+0x2238/0x2a60 fs/namei.c:4863 do_file_open+0x1c8/0x2e8 fs/namei.c:4892 do_sys_openat2+0x114/0x1e8 fs/open.c:1368 do_sys_open+0xb0/0xe0 fs/open.c:1374 __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __arm64_sys_openat+0xa8/0xc4 fs/open.c:1385 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:738 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:757 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 -> #0 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x17c0/0x2ebc kernel/locking/lockdep.c:5237 lock_acquire+0x140/0x364 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x164/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 process_measurement+0x5b4/0x17d4 security/integrity/ima/ima_main.c:319 ima_file_check+0xd0/0x11c security/integrity/ima/ima_main.c:685 security_file_post_open+0x94/0x280 security/security.c:2755 do_open fs/namei.c:4702 [inline] path_openat+0x2238/0x2a60 fs/namei.c:4863 do_file_open+0x1c8/0x2e8 fs/namei.c:4892 file_open_name+0x148/0x1a0 fs/open.c:1326 filp_open+0x3c/0x60 fs/open.c:1343 nvmet_file_ns_enable+0x88/0x30c drivers/nvme/target/io-cmd-file.c:41 nvmet_ns_enable+0xac/0x4f0 drivers/nvme/target/core.c:596 nvmet_ns_enable_store+0xd4/0x170 drivers/nvme/target/configfs.c:735 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x27c/0x354 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:738 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:757 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 other info that might help us debug this: Chain exists of: &ima_iint_mutex_key[depth] --> &p->frag_sem --> &subsys->lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&subsys->lock#2); lock(&p->frag_sem); lock(&subsys->lock#2); lock(&ima_iint_mutex_key[depth]); *** DEADLOCK *** 6 locks held by syz.6.769/8247: #0: ffff0000d51c9cf0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x100/0x144 fs/file.c:1259 #1: ffff0000c39dc450 (sb_writers#16){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2733 [inline] #1: ffff0000c39dc450 (sb_writers#16){.+.+}-{0:0}, at: vfs_write+0x248/0xa0c fs/read_write.c:683 #2: ffff0000d5616a80 (&buffer->mutex){+.+.}-{4:4}, at: configfs_write_iter+0x74/0x354 fs/configfs/file.c:226 #3: ffff0000c52a1670 (&p->frag_sem){.+.+}-{4:4}, at: flush_write_buffer fs/configfs/file.c:205 [inline] #3: ffff0000c52a1670 (&p->frag_sem){.+.+}-{4:4}, at: configfs_write_iter+0x1c4/0x354 fs/configfs/file.c:229 #4: ffff80008943faa8 (nvmet_config_sem){+.+.}-{4:4}, at: nvmet_ns_enable_store+0xc4/0x170 drivers/nvme/target/configfs.c:733 #5: ffff0000f5ca1068 (&subsys->lock#2){+.+.}-{4:4}, at: nvmet_ns_enable+0x58/0x4f0 drivers/nvme/target/core.c:583 stack backtrace: CPU: 0 UID: 0 PID: 8247 Comm: syz.6.769 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x328/0x330 kernel/locking/lockdep.c:2043 check_noncircular+0x158/0x174 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 kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x17c0/0x2ebc kernel/locking/lockdep.c:5237 lock_acquire+0x140/0x364 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x164/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 process_measurement+0x5b4/0x17d4 security/integrity/ima/ima_main.c:319 ima_file_check+0xd0/0x11c security/integrity/ima/ima_main.c:685 security_file_post_open+0x94/0x280 security/security.c:2755 do_open fs/namei.c:4702 [inline] path_openat+0x2238/0x2a60 fs/namei.c:4863 do_file_open+0x1c8/0x2e8 fs/namei.c:4892 file_open_name+0x148/0x1a0 fs/open.c:1326 filp_open+0x3c/0x60 fs/open.c:1343 nvmet_file_ns_enable+0x88/0x30c drivers/nvme/target/io-cmd-file.c:41 nvmet_ns_enable+0xac/0x4f0 drivers/nvme/target/core.c:596 nvmet_ns_enable_store+0xd4/0x170 drivers/nvme/target/configfs.c:735 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x27c/0x354 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:738 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:757 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 nvme nvme1: creating 2 I/O queues. nvme nvme1: new ctrl: "testnqn"