R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6aee5b6080 R15: 00007ffdbad4bbb8 ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc5-syzkaller-00300-g3ce9925823c7 #0 Tainted: G U ------------------------------------------------------ syz.5.3437/23258 is trying to acquire lock: ffff88802fb6a9f8 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: process_measurement+0x7e0/0x23e0 security/integrity/ima/ima_main.c:279 but task is already holding lock: ffffffff8f2ed228 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:113 [inline] ffffffff8f2ed228 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev drivers/base/power/main.c:2059 [inline] ffffffff8f2ed228 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x2d/0xb0 drivers/base/power/main.c:2052 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (dpm_list_mtx){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 device_pm_add+0x87/0x3e0 drivers/base/power/main.c:137 device_add+0x9cd/0x1a70 drivers/base/core.c:3655 pmu_dev_alloc+0x27c/0x400 kernel/events/core.c:12087 perf_event_sysfs_init+0xb3/0x150 kernel/events/core.c:14537 do_one_initcall+0x120/0x6e0 init/main.c:1257 do_initcall_level init/main.c:1319 [inline] do_initcalls init/main.c:1335 [inline] do_basic_setup init/main.c:1354 [inline] kernel_init_freeable+0x5c2/0x900 init/main.c:1567 kernel_init+0x1c/0x2b0 init/main.c:1457 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #4 (pmus_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 perf_event_init_cpu+0xc9/0x850 kernel/events/core.c:14442 cpuhp_invoke_callback+0x3d2/0xa10 kernel/cpu.c:194 __cpuhp_invoke_callback_range+0x101/0x210 kernel/cpu.c:967 cpuhp_invoke_callback_range kernel/cpu.c:991 [inline] cpuhp_up_callbacks kernel/cpu.c:1022 [inline] _cpu_up+0x3f5/0x930 kernel/cpu.c:1687 cpu_up+0x1dc/0x240 kernel/cpu.c:1719 cpuhp_bringup_mask+0xd8/0x210 kernel/cpu.c:1785 cpuhp_bringup_cpus_parallel kernel/cpu.c:1875 [inline] bringup_nonboot_cpus+0x176/0x1c0 kernel/cpu.c:1889 smp_init+0x34/0x160 kernel/smp.c:1010 kernel_init_freeable+0x3a8/0x900 init/main.c:1559 kernel_init+0x1c/0x2b0 init/main.c:1457 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #3 (cpu_hotplug_lock){++++}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:52 [inline] cpus_read_lock+0x42/0x160 kernel/cpu.c:490 ring_buffer_resize+0x7ea/0x1560 kernel/trace/ring_buffer.c:2894 __tracing_resize_ring_buffer.part.0+0x52/0x1f0 kernel/trace/trace.c:5943 __tracing_resize_ring_buffer kernel/trace/trace.c:5937 [inline] tracing_resize_ring_buffer kernel/trace/trace.c:5998 [inline] tracing_free_buffer_release+0x104/0x270 kernel/trace/trace.c:7094 __fput+0x3ff/0xb70 fs/file_table.c:465 task_work_run+0x14d/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x230 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&buffer->mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 ring_buffer_resize+0x113/0x1560 kernel/trace/ring_buffer.c:2851 __tracing_resize_ring_buffer.part.0+0x52/0x1f0 kernel/trace/trace.c:5943 __tracing_resize_ring_buffer kernel/trace/trace.c:5937 [inline] tracing_update_buffers+0x102/0x130 kernel/trace/trace.c:6170 ftrace_event_write+0x14a/0x290 kernel/trace/trace_events.c:1494 vfs_write+0x25c/0x1180 fs/read_write.c:682 ksys_write+0x12a/0x240 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (trace_types_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 class_mutex_constructor include/linux/mutex.h:201 [inline] trace_array_get kernel/trace/trace.c:550 [inline] tracing_check_open_get_tr.part.0+0x45/0x130 kernel/trace/trace.c:598 tracing_check_open_get_tr kernel/trace/trace.c:592 [inline] tracing_open_generic_tr+0x66/0xf0 kernel/trace/trace.c:4699 do_dentry_open+0x741/0x1c10 fs/open.c:956 vfs_open+0x82/0x3f0 fs/open.c:1086 dentry_open+0x71/0xd0 fs/open.c:1109 ima_calc_file_hash+0x2b6/0x490 security/integrity/ima/ima_crypto.c:553 ima_collect_measurement+0x897/0xa40 security/integrity/ima/ima_api.c:293 process_measurement+0x11fa/0x23e0 security/integrity/ima/ima_main.c:385 ima_file_check+0xc5/0x110 security/integrity/ima/ima_main.c:613 security_file_post_open+0x8e/0x210 security/security.c:3130 do_open fs/namei.c:3882 [inline] path_openat+0x147d/0x2d40 fs/namei.c:4039 do_filp_open+0x20b/0x470 fs/namei.c:4066 do_sys_openat2+0x11b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 process_measurement+0x7e0/0x23e0 security/integrity/ima/ima_main.c:279 ima_file_check+0xc5/0x110 security/integrity/ima/ima_main.c:613 security_file_post_open+0x8e/0x210 security/security.c:3130 do_open fs/namei.c:3882 [inline] path_openat+0x147d/0x2d40 fs/namei.c:4039 do_file_open_root+0x322/0x610 fs/namei.c:4091 file_open_root+0x2a7/0x450 fs/open.c:1408 kernel_read_file_from_path_initns+0x189/0x260 fs/kernel_read_file.c:163 fw_get_filesystem_firmware drivers/base/firmware_loader/main.c:549 [inline] _request_firmware+0x744/0x1470 drivers/base/firmware_loader/main.c:916 request_firmware drivers/base/firmware_loader/main.c:992 [inline] cache_firmware drivers/base/firmware_loader/main.c:1330 [inline] __async_dev_cache_fw_image+0xb1/0x340 drivers/base/firmware_loader/main.c:1444 async_schedule_node_domain+0xd1/0x120 kernel/async.c:221 async_schedule_domain include/linux/async.h:72 [inline] dev_cache_fw_image+0x38e/0x490 drivers/base/firmware_loader/main.c:1500 dpm_for_each_dev drivers/base/power/main.c:2061 [inline] dpm_for_each_dev+0x5a/0xb0 drivers/base/power/main.c:2052 device_cache_fw_images drivers/base/firmware_loader/main.c:1550 [inline] fw_pm_notify+0x81/0x150 drivers/base/firmware_loader/main.c:1601 notifier_call_chain+0xb9/0x410 kernel/notifier.c:85 notifier_call_chain_robust kernel/notifier.c:120 [inline] blocking_notifier_call_chain_robust kernel/notifier.c:345 [inline] blocking_notifier_call_chain_robust+0xc8/0x160 kernel/notifier.c:333 pm_notifier_call_chain_robust+0x27/0x60 kernel/power/main.c:102 snapshot_open+0x189/0x2b0 kernel/power/user.c:77 misc_open+0x35a/0x420 drivers/char/misc.c:179 chrdev_open+0x231/0x6a0 fs/char_dev.c:414 do_dentry_open+0x741/0x1c10 fs/open.c:956 vfs_open+0x82/0x3f0 fs/open.c:1086 do_open fs/namei.c:3880 [inline] path_openat+0x1e5e/0x2d40 fs/namei.c:4039 do_filp_open+0x20b/0x470 fs/namei.c:4066 do_sys_openat2+0x11b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x230 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: &ima_iint_mutex_key[depth] --> pmus_lock --> dpm_list_mtx Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(dpm_list_mtx); lock(pmus_lock); lock(dpm_list_mtx); lock(&ima_iint_mutex_key[depth]); *** DEADLOCK *** 5 locks held by syz.5.3437/23258: #0: ffffffff8f0e2e08 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x420 drivers/char/misc.c:143 #1: ffffffff8e283608 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x87/0xa0 kernel/power/main.c:56 #2: ffffffff8e2c3150 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust kernel/notifier.c:344 [inline] #2: ffffffff8e2c3150 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust+0xa8/0x160 kernel/notifier.c:333 #3: ffffffff8f2f2608 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1548 [inline] #3: ffffffff8f2f2608 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x69/0x150 drivers/base/firmware_loader/main.c:1601 #4: ffffffff8f2ed228 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:113 [inline] #4: ffffffff8f2ed228 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev drivers/base/power/main.c:2059 [inline] #4: ffffffff8f2ed228 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x2d/0xb0 drivers/base/power/main.c:2052 stack backtrace: CPU: 1 UID: 0 PID: 23258 Comm: syz.5.3437 Tainted: G U 6.15.0-rc5-syzkaller-00300-g3ce9925823c7 #0 PREEMPT(full) Tainted: [U]=USER 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:2079 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 process_measurement+0x7e0/0x23e0 security/integrity/ima/ima_main.c:279 ima_file_check+0xc5/0x110 security/integrity/ima/ima_main.c:613 security_file_post_open+0x8e/0x210 security/security.c:3130 do_open fs/namei.c:3882 [inline] path_openat+0x147d/0x2d40 fs/namei.c:4039 do_file_open_root+0x322/0x610 fs/namei.c:4091 file_open_root+0x2a7/0x450 fs/open.c:1408 kernel_read_file_from_path_initns+0x189/0x260 fs/kernel_read_file.c:163 fw_get_filesystem_firmware drivers/base/firmware_loader/main.c:549 [inline] _request_firmware+0x744/0x1470 drivers/base/firmware_loader/main.c:916 request_firmware drivers/base/firmware_loader/main.c:992 [inline] cache_firmware drivers/base/firmware_loader/main.c:1330 [inline] __async_dev_cache_fw_image+0xb1/0x340 drivers/base/firmware_loader/main.c:1444 async_schedule_node_domain+0xd1/0x120 kernel/async.c:221 async_schedule_domain include/linux/async.h:72 [inline] dev_cache_fw_image+0x38e/0x490 drivers/base/firmware_loader/main.c:1500 dpm_for_each_dev drivers/base/power/main.c:2061 [inline] dpm_for_each_dev+0x5a/0xb0 drivers/base/power/main.c:2052 device_cache_fw_images drivers/base/firmware_loader/main.c:1550 [inline] fw_pm_notify+0x81/0x150 drivers/base/firmware_loader/main.c:1601 notifier_call_chain+0xb9/0x410 kernel/notifier.c:85 notifier_call_chain_robust kernel/notifier.c:120 [inline] blocking_notifier_call_chain_robust kernel/notifier.c:345 [inline] blocking_notifier_call_chain_robust+0xc8/0x160 kernel/notifier.c:333 pm_notifier_call_chain_robust+0x27/0x60 kernel/power/main.c:102 snapshot_open+0x189/0x2b0 kernel/power/user.c:77 misc_open+0x35a/0x420 drivers/char/misc.c:179 chrdev_open+0x231/0x6a0 fs/char_dev.c:414 do_dentry_open+0x741/0x1c10 fs/open.c:956 vfs_open+0x82/0x3f0 fs/open.c:1086 do_open fs/namei.c:3880 [inline] path_openat+0x1e5e/0x2d40 fs/namei.c:4039 do_filp_open+0x20b/0x470 fs/namei.c:4066 do_sys_openat2+0x11b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6aee38e969 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:00007f6aef159038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f6aee5b6080 RCX: 00007f6aee38e969 RDX: 0000000000020080 RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f6aee410ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6aee5b6080 R15: 00007ffdbad4bbb8 (NULL device *): loading /lib/firmware/regulatory.db.p7s failed with error -4 (NULL device *): Direct firmware load for regulatory.db.p7s failed with error -4 (NULL device *): Falling back to sysfs fallback for: regulatory.db.p7s