syzbot

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6aee5b6080 R15: 00007ffdbad4bbb8
 </TASK>
======================================================
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:
 <TASK>
 __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
 </TASK>
(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