R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ============================================ WARNING: possible recursive locking detected 6.11.0-rc5-syzkaller-00316-g6cd90e5ea72f #0 Not tainted -------------------------------------------- syz.0.1606/11026 is trying to acquire lock: ffffffff8ebf2bc8 (fw_lock){+.+.}-{3:3}, at: assign_fw+0x4e/0x600 drivers/base/firmware_loader/main.c:700 but task is already holding lock: ffffffff8ebf2bc8 (fw_lock){+.+.}-{3:3}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1519 [inline] ffffffff8ebf2bc8 (fw_lock){+.+.}-{3:3}, at: fw_pm_notify+0x69/0x150 drivers/base/firmware_loader/main.c:1572 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(fw_lock); lock(fw_lock); *** DEADLOCK *** May be due to missing lock nesting notation 5 locks held by syz.0.1606/11026: #0: ffffffff8e9ee488 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x4c0 drivers/char/misc.c:129 #1: ffffffff8dc7fb48 (system_transition_mutex){+.+.}-{3:3}, at: lock_system_sleep+0x87/0xa0 kernel/power/main.c:56 #2: ffffffff8dcbd770 ((pm_chain_head).rwsem){++++}-{3:3}, at: blocking_notifier_call_chain_robust kernel/notifier.c:352 [inline] #2: ffffffff8dcbd770 ((pm_chain_head).rwsem){++++}-{3:3}, at: blocking_notifier_call_chain_robust+0xa9/0x170 kernel/notifier.c:341 #3: ffffffff8ebf2bc8 (fw_lock){+.+.}-{3:3}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1519 [inline] #3: ffffffff8ebf2bc8 (fw_lock){+.+.}-{3:3}, at: fw_pm_notify+0x69/0x150 drivers/base/firmware_loader/main.c:1572 #4: ffffffff8ebed748 (dpm_list_mtx){+.+.}-{3:3}, at: device_pm_lock drivers/base/power/main.c:113 [inline] #4: ffffffff8ebed748 (dpm_list_mtx){+.+.}-{3:3}, at: dpm_for_each_dev drivers/base/power/main.c:1961 [inline] #4: ffffffff8ebed748 (dpm_list_mtx){+.+.}-{3:3}, at: dpm_for_each_dev+0x2d/0xb0 drivers/base/power/main.c:1954 stack backtrace: CPU: 3 UID: 0 PID: 11026 Comm: syz.0.1606 Not tainted 6.11.0-rc5-syzkaller-00316-g6cd90e5ea72f #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 check_deadlock kernel/locking/lockdep.c:3061 [inline] validate_chain kernel/locking/lockdep.c:3855 [inline] __lock_acquire+0x2167/0x3cb0 kernel/locking/lockdep.c:5142 lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 assign_fw+0x4e/0x600 drivers/base/firmware_loader/main.c:700 _request_firmware+0x84c/0x12f0 drivers/base/firmware_loader/main.c:917 request_firmware drivers/base/firmware_loader/main.c:963 [inline] cache_firmware drivers/base/firmware_loader/main.c:1301 [inline] __async_dev_cache_fw_image+0xb2/0x340 drivers/base/firmware_loader/main.c:1415 async_schedule_node_domain+0xd1/0x120 kernel/async.c:221 async_schedule_domain include/linux/async.h:72 [inline] dev_cache_fw_image+0x38f/0x490 drivers/base/firmware_loader/main.c:1471 dpm_for_each_dev drivers/base/power/main.c:1963 [inline] dpm_for_each_dev+0x5a/0xb0 drivers/base/power/main.c:1954 device_cache_fw_images drivers/base/firmware_loader/main.c:1521 [inline] fw_pm_notify+0x81/0x150 drivers/base/firmware_loader/main.c:1572 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 notifier_call_chain_robust kernel/notifier.c:128 [inline] blocking_notifier_call_chain_robust kernel/notifier.c:353 [inline] blocking_notifier_call_chain_robust+0xc9/0x170 kernel/notifier.c:341 pm_notifier_call_chain_robust+0x27/0x60 kernel/power/main.c:102 snapshot_open+0x227/0x2b0 kernel/power/user.c:87 misc_open+0x3da/0x4c0 drivers/char/misc.c:165 chrdev_open+0x26d/0x6f0 fs/char_dev.c:414 do_dentry_open+0x91f/0x15f0 fs/open.c:959 vfs_open+0x82/0x3f0 fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x2141/0x2d20 fs/namei.c:3886 do_filp_open+0x1dc/0x430 fs/namei.c:3913 do_sys_openat2+0x17a/0x1e0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_compat_sys_openat fs/open.c:1491 [inline] __se_compat_sys_openat fs/open.c:1489 [inline] __ia32_compat_sys_openat+0x16e/0x210 fs/open.c:1489 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7fb4579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f575656c EFLAGS: 00000296 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 00000000200000c0 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi