R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8a919b5fa0 R15: 00007ffd43669b08 ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc4-syzkaller-00049-gb4911fb0b060 #0 Tainted: G U ------------------------------------------------------ syz.5.6953/28960 is trying to acquire lock: ffff88807645b6c8 (&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: ffffffff8f50ffe8 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:114 [inline] ffffffff8f50ffe8 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev drivers/base/power/main.c:2221 [inline] ffffffff8f50ffe8 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x2d/0xb0 drivers/base/power/main.c:2214 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (dpm_list_mtx){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 device_pm_add+0x87/0x3e0 drivers/base/power/main.c:138 device_add+0x9cd/0x1a70 drivers/base/core.c:3655 device_create_groups_vargs+0x1f8/0x270 drivers/base/core.c:4374 device_create+0xed/0x130 drivers/base/core.c:4413 msr_device_create+0x31/0x70 arch/x86/kernel/msr.c:251 cpuhp_invoke_callback+0x3d5/0xa10 kernel/cpu.c:194 cpuhp_thread_fun+0x47e/0x6f0 kernel/cpu.c:1104 smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:164 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #3 (cpuhp_state-up){+.+.}-{0:0}: cpuhp_lock_acquire kernel/cpu.c:103 [inline] cpuhp_thread_fun+0x193/0x6f0 kernel/cpu.c:1081 smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:164 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (cpu_hotplug_lock){++++}-{0:0}: percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline] percpu_down_read include/linux/percpu-rwsem.h:77 [inline] cpus_read_lock+0x42/0x160 kernel/cpu.c:490 class_cpus_read_lock_constructor include/linux/cpuhplock.h:47 [inline] ring_buffer_resize+0x105/0x15c0 kernel/trace/ring_buffer.c:2852 __tracing_resize_ring_buffer.part.0+0x52/0x1f0 kernel/trace/trace.c:6040 __tracing_resize_ring_buffer kernel/trace/trace.c:6034 [inline] tracing_update_buffers+0x102/0x130 kernel/trace/trace.c:6272 event_pid_write.isra.0+0xf8/0x7c0 kernel/trace/trace_events.c:2426 vfs_write+0x29d/0x1150 fs/read_write.c:684 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 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:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 class_mutex_constructor include/linux/mutex.h:225 [inline] trace_array_get kernel/trace/trace.c:612 [inline] tracing_check_open_get_tr.part.0+0x45/0x130 kernel/trace/trace.c:660 tracing_check_open_get_tr+0x34/0x50 kernel/trace/trace.c:654 ftrace_event_set_open+0x50/0x380 kernel/trace/trace_events.c:2669 do_dentry_open+0x744/0x1c10 fs/open.c:964 vfs_open+0x82/0x3f0 fs/open.c:1094 dentry_open+0x71/0xd0 fs/open.c:1117 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:3898 [inline] path_openat+0x1404/0x2cb0 fs/namei.c:4055 do_filp_open+0x20b/0x470 fs/namei.c:4082 do_sys_openat2+0x11b/0x1d0 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+0x174/0x210 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 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:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 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:3898 [inline] path_openat+0x1404/0x2cb0 fs/namei.c:4055 do_file_open_root+0x322/0x610 fs/namei.c:4107 file_open_root+0x2a7/0x450 fs/open.c:1416 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:890 request_firmware drivers/base/firmware_loader/main.c:966 [inline] cache_firmware drivers/base/firmware_loader/main.c:1304 [inline] __async_dev_cache_fw_image+0xb1/0x340 drivers/base/firmware_loader/main.c:1418 async_schedule_node_domain+0xd4/0x120 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:1474 dpm_for_each_dev drivers/base/power/main.c:2223 [inline] dpm_for_each_dev+0x5a/0xb0 drivers/base/power/main.c:2214 device_cache_fw_images drivers/base/firmware_loader/main.c:1524 [inline] fw_pm_notify+0x81/0x150 drivers/base/firmware_loader/main.c:1575 notifier_call_chain+0xbc/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+0x218/0x2b0 kernel/power/user.c:87 misc_open+0x35a/0x420 drivers/char/misc.c:161 chrdev_open+0x231/0x6a0 fs/char_dev.c:414 do_dentry_open+0x744/0x1c10 fs/open.c:964 vfs_open+0x82/0x3f0 fs/open.c:1094 do_open fs/namei.c:3896 [inline] path_openat+0x1de4/0x2cb0 fs/namei.c:4055 do_filp_open+0x20b/0x470 fs/namei.c:4082 do_sys_openat2+0x11b/0x1d0 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+0x174/0x210 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 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] --> cpuhp_state-up --> dpm_list_mtx Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(dpm_list_mtx); lock(cpuhp_state-up); lock(dpm_list_mtx); lock(&ima_iint_mutex_key[depth]); *** DEADLOCK *** 5 locks held by syz.5.6953/28960: #0: ffffffff8f303568 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x420 drivers/char/misc.c:125 #1: ffffffff8e487cc8 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x87/0xa0 kernel/power/main.c:56 #2: ffffffff8e4c8470 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust kernel/notifier.c:344 [inline] #2: ffffffff8e4c8470 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust+0xa8/0x160 kernel/notifier.c:333 #3: ffffffff8f5155e8 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1522 [inline] #3: ffffffff8f5155e8 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x69/0x150 drivers/base/firmware_loader/main.c:1575 #4: ffffffff8f50ffe8 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:114 [inline] #4: ffffffff8f50ffe8 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev drivers/base/power/main.c:2221 [inline] #4: ffffffff8f50ffe8 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x2d/0xb0 drivers/base/power/main.c:2214 stack backtrace: CPU: 0 UID: 0 PID: 28960 Comm: syz.5.6953 Tainted: G U 6.16.0-rc4-syzkaller-00049-gb4911fb0b060 #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:2046 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 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:3898 [inline] path_openat+0x1404/0x2cb0 fs/namei.c:4055 do_file_open_root+0x322/0x610 fs/namei.c:4107 file_open_root+0x2a7/0x450 fs/open.c:1416 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:890 request_firmware drivers/base/firmware_loader/main.c:966 [inline] cache_firmware drivers/base/firmware_loader/main.c:1304 [inline] __async_dev_cache_fw_image+0xb1/0x340 drivers/base/firmware_loader/main.c:1418 async_schedule_node_domain+0xd4/0x120 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:1474 dpm_for_each_dev drivers/base/power/main.c:2223 [inline] dpm_for_each_dev+0x5a/0xb0 drivers/base/power/main.c:2214 device_cache_fw_images drivers/base/firmware_loader/main.c:1524 [inline] fw_pm_notify+0x81/0x150 drivers/base/firmware_loader/main.c:1575 notifier_call_chain+0xbc/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+0x218/0x2b0 kernel/power/user.c:87 misc_open+0x35a/0x420 drivers/char/misc.c:161 chrdev_open+0x231/0x6a0 fs/char_dev.c:414 do_dentry_open+0x744/0x1c10 fs/open.c:964 vfs_open+0x82/0x3f0 fs/open.c:1094 do_open fs/namei.c:3896 [inline] path_openat+0x1de4/0x2cb0 fs/namei.c:4055 do_filp_open+0x20b/0x470 fs/namei.c:4082 do_sys_openat2+0x11b/0x1d0 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+0x174/0x210 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8a9178e929 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:00007f8a925e4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f8a919b5fa0 RCX: 00007f8a9178e929 RDX: 0000000000080201 RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f8a91810b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8a919b5fa0 R15: 00007ffd43669b08 (NULL device *): loading /lib/firmware/regulatory.db failed with error -12 (NULL device *): Direct firmware load for regulatory.db failed with error -12 (NULL device *): Falling back to sysfs fallback for: regulatory.db