===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 5.9.0-syzkaller #0 Not tainted ----------------------------------------------------- syz-executor.0/8504 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffff888214f38760 (&card->ctl_files_rwlock){.+.+}-{2:2}, at: snd_ctl_notify+0x86/0x550 sound/core/control.c:153 and this task is already holding: ffff888214f1d908 (&group->lock){..-.}-{2:2}, at: __snd_pcm_lib_xfer+0xb6f/0x1320 sound/core/pcm_lib.c:2227 which would create a new lock dependency: (&group->lock){..-.}-{2:2} -> (&card->ctl_files_rwlock){.+.+}-{2:2} but this new dependency connects a SOFTIRQ-irq-safe lock: (&group->lock){..-.}-{2:2} ... which became SOFTIRQ-irq-safe at: lock_acquire+0x160/0x710 kernel/locking/lockdep.c:5442 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xaa/0xd0 kernel/locking/spinlock.c:159 snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1799 dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:378 __run_hrtimer kernel/time/hrtimer.c:1524 [inline] __hrtimer_run_queues+0x47f/0x930 kernel/time/hrtimer.c:1588 hrtimer_run_softirq+0x15a/0x1b0 kernel/time/hrtimer.c:1605 __do_softirq+0x256/0x6e0 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x9a/0xf0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu+0x21f/0x230 kernel/softirq.c:423 irq_exit_rcu+0x5/0x20 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0xe0/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 __sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:193 tomoyo_check_path_acl+0x1f/0x180 security/tomoyo/file.c:254 tomoyo_check_acl+0x136/0x420 security/tomoyo/domain.c:175 tomoyo_path_permission security/tomoyo/file.c:586 [inline] tomoyo_path_perm+0x46f/0x740 security/tomoyo/file.c:838 security_inode_getattr+0xc0/0x140 security/security.c:1278 vfs_getattr fs/stat.c:121 [inline] vfs_statx+0x118/0x380 fs/stat.c:206 vfs_lstat include/linux/fs.h:3166 [inline] __do_sys_newlstat fs/stat.c:374 [inline] __se_sys_newlstat fs/stat.c:368 [inline] __x64_sys_newlstat+0x81/0xd0 fs/stat.c:368 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 to a SOFTIRQ-irq-unsafe lock: (&card->ctl_files_rwlock){.+.+}-{2:2} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire+0x160/0x710 kernel/locking/lockdep.c:5442 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 snd_ctl_notify+0x86/0x550 sound/core/control.c:153 __snd_ctl_add_replace+0x582/0x8a0 sound/core/control.c:382 snd_ctl_add_replace sound/core/control.c:399 [inline] snd_ctl_add+0x6e/0x110 sound/core/control.c:426 snd_card_dummy_new_mixer sound/drivers/dummy.c:885 [inline] snd_dummy_probe+0xb9e/0x1000 sound/drivers/dummy.c:1080 platform_drv_probe+0xcd/0x150 drivers/base/platform.c:747 really_probe+0x753/0x1110 drivers/base/dd.c:557 driver_probe_device+0x106/0x1a0 drivers/base/dd.c:738 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431 __device_attach+0x262/0x3f0 drivers/base/dd.c:912 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491 device_add+0x1630/0x19b0 drivers/base/core.c:2926 platform_device_add+0x4ad/0x6e0 drivers/base/platform.c:597 platform_device_register_full+0x448/0x530 drivers/base/platform.c:720 platform_device_register_resndata include/linux/platform_device.h:131 [inline] platform_device_register_simple include/linux/platform_device.h:160 [inline] alsa_card_dummy_init+0x1b3/0x398 sound/drivers/dummy.c:1168 do_one_initcall+0x14b/0x350 init/main.c:1205 do_initcall_level+0x101/0x14c init/main.c:1278 do_initcalls+0x59/0x9b init/main.c:1294 kernel_init_freeable+0x356/0x474 init/main.c:1514 kernel_init+0xd/0x290 init/main.c:1403 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&card->ctl_files_rwlock); local_irq_disable(); lock(&group->lock); lock(&card->ctl_files_rwlock); lock(&group->lock); *** DEADLOCK *** 1 lock held by syz-executor.0/8504: #0: ffff888214f1d908 (&group->lock){..-.}-{2:2}, at: __snd_pcm_lib_xfer+0xb6f/0x1320 sound/core/pcm_lib.c:2227 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&group->lock){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire+0x160/0x710 kernel/locking/lockdep.c:5442 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xaa/0xd0 kernel/locking/spinlock.c:159 snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1799 dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:378 __run_hrtimer kernel/time/hrtimer.c:1524 [inline] __hrtimer_run_queues+0x47f/0x930 kernel/time/hrtimer.c:1588 hrtimer_run_softirq+0x15a/0x1b0 kernel/time/hrtimer.c:1605 __do_softirq+0x256/0x6e0 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x9a/0xf0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu+0x21f/0x230 kernel/softirq.c:423 irq_exit_rcu+0x5/0x20 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0xe0/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 __sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:193 tomoyo_check_path_acl+0x1f/0x180 security/tomoyo/file.c:254 tomoyo_check_acl+0x136/0x420 security/tomoyo/domain.c:175 tomoyo_path_permission security/tomoyo/file.c:586 [inline] tomoyo_path_perm+0x46f/0x740 security/tomoyo/file.c:838 security_inode_getattr+0xc0/0x140 security/security.c:1278 vfs_getattr fs/stat.c:121 [inline] vfs_statx+0x118/0x380 fs/stat.c:206 vfs_lstat include/linux/fs.h:3166 [inline] __do_sys_newlstat fs/stat.c:374 [inline] __se_sys_newlstat fs/stat.c:368 [inline] __x64_sys_newlstat+0x81/0xd0 fs/stat.c:368 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 INITIAL USE at: lock_acquire+0x160/0x710 kernel/locking/lockdep.c:5442 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0xa6/0xc0 kernel/locking/spinlock.c:167 snd_pcm_oss_poll+0x43f/0x8d0 sound/core/oss/pcm_oss.c:2821 vfs_poll include/linux/poll.h:90 [inline] do_select+0x107d/0x19e0 fs/select.c:534 core_sys_select+0x732/0x9e0 fs/select.c:677 do_pselect fs/select.c:759 [inline] __do_sys_pselect6 fs/select.c:800 [inline] __se_sys_pselect6+0x375/0x3f0 fs/select.c:791 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 } ... key at: [] snd_pcm_group_init.__key+0x0/0x10 ... acquired at: lock_acquire+0x160/0x710 kernel/locking/lockdep.c:5442 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 snd_ctl_notify+0x86/0x550 sound/core/control.c:153 loopback_check_format sound/drivers/aloop.c:358 [inline] loopback_trigger+0xc40/0x1500 sound/drivers/aloop.c:387 snd_pcm_do_start sound/core/pcm_native.c:1350 [inline] snd_pcm_action_single sound/core/pcm_native.c:1207 [inline] snd_pcm_action sound/core/pcm_native.c:1290 [inline] snd_pcm_start+0x471/0x6c0 sound/core/pcm_native.c:1391 __snd_pcm_lib_xfer+0xf73/0x1320 sound/core/pcm_lib.c:2247 snd_pcm_oss_write3+0x209/0x330 sound/core/oss/pcm_oss.c:1221 snd_pcm_plug_write_transfer+0x28b/0x490 sound/core/oss/pcm_plugin.c:624 snd_pcm_oss_write2 sound/core/oss/pcm_oss.c:1353 [inline] snd_pcm_oss_sync1+0x299/0x770 sound/core/oss/pcm_oss.c:1594 snd_pcm_oss_sync+0x5b9/0x900 sound/core/oss/pcm_oss.c:1659 snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2546 __fput+0x34f/0x7b0 fs/file_table.c:281 task_work_run+0x137/0x1c0 kernel/task_work.c:141 get_signal+0x15cb/0x1d50 kernel/signal.c:2561 arch_do_signal+0x33/0x610 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x98/0x1f0 kernel/entry/common.c:192 syscall_exit_to_user_mode+0x82/0x1d0 kernel/entry/common.c:267 entry_SYSCALL_64_after_hwframe+0x44/0xa9 the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (&card->ctl_files_rwlock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire+0x160/0x710 kernel/locking/lockdep.c:5442 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 snd_ctl_notify+0x86/0x550 sound/core/control.c:153 __snd_ctl_add_replace+0x582/0x8a0 sound/core/control.c:382 snd_ctl_add_replace sound/core/control.c:399 [inline] snd_ctl_add+0x6e/0x110 sound/core/control.c:426 snd_card_dummy_new_mixer sound/drivers/dummy.c:885 [inline] snd_dummy_probe+0xb9e/0x1000 sound/drivers/dummy.c:1080 platform_drv_probe+0xcd/0x150 drivers/base/platform.c:747 really_probe+0x753/0x1110 drivers/base/dd.c:557 driver_probe_device+0x106/0x1a0 drivers/base/dd.c:738 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431 __device_attach+0x262/0x3f0 drivers/base/dd.c:912 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491 device_add+0x1630/0x19b0 drivers/base/core.c:2926 platform_device_add+0x4ad/0x6e0 drivers/base/platform.c:597 platform_device_register_full+0x448/0x530 drivers/base/platform.c:720 platform_device_register_resndata include/linux/platform_device.h:131 [inline] platform_device_register_simple include/linux/platform_device.h:160 [inline] alsa_card_dummy_init+0x1b3/0x398 sound/drivers/dummy.c:1168 do_one_initcall+0x14b/0x350 init/main.c:1205 do_initcall_level+0x101/0x14c init/main.c:1278 do_initcalls+0x59/0x9b init/main.c:1294 kernel_init_freeable+0x356/0x474 init/main.c:1514 kernel_init+0xd/0x290 init/main.c:1403 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 SOFTIRQ-ON-R at: lock_acquire+0x160/0x710 kernel/locking/lockdep.c:5442 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 snd_ctl_notify+0x86/0x550 sound/core/control.c:153 __snd_ctl_add_replace+0x582/0x8a0 sound/core/control.c:382 snd_ctl_add_replace sound/core/control.c:399 [inline] snd_ctl_add+0x6e/0x110 sound/core/control.c:426 snd_card_dummy_new_mixer sound/drivers/dummy.c:885 [inline] snd_dummy_probe+0xb9e/0x1000 sound/drivers/dummy.c:1080 platform_drv_probe+0xcd/0x150 drivers/base/platform.c:747 really_probe+0x753/0x1110 drivers/base/dd.c:557 driver_probe_device+0x106/0x1a0 drivers/base/dd.c:738 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431 __device_attach+0x262/0x3f0 drivers/base/dd.c:912 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491 device_add+0x1630/0x19b0 drivers/base/core.c:2926 platform_device_add+0x4ad/0x6e0 drivers/base/platform.c:597 platform_device_register_full+0x448/0x530 drivers/base/platform.c:720 platform_device_register_resndata include/linux/platform_device.h:131 [inline] platform_device_register_simple include/linux/platform_device.h:160 [inline] alsa_card_dummy_init+0x1b3/0x398 sound/drivers/dummy.c:1168 do_one_initcall+0x14b/0x350 init/main.c:1205 do_initcall_level+0x101/0x14c init/main.c:1278 do_initcalls+0x59/0x9b init/main.c:1294 kernel_init_freeable+0x356/0x474 init/main.c:1514 kernel_init+0xd/0x290 init/main.c:1403 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INITIAL READ USE at: lock_acquire+0x160/0x710 kernel/locking/lockdep.c:5442 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 snd_ctl_notify+0x86/0x550 sound/core/control.c:153 __snd_ctl_add_replace+0x582/0x8a0 sound/core/control.c:382 snd_ctl_add_replace sound/core/control.c:399 [inline] snd_ctl_add+0x6e/0x110 sound/core/control.c:426 snd_card_dummy_new_mixer sound/drivers/dummy.c:885 [inline] snd_dummy_probe+0xb9e/0x1000 sound/drivers/dummy.c:1080 platform_drv_probe+0xcd/0x150 drivers/base/platform.c:747 really_probe+0x753/0x1110 drivers/base/dd.c:557 driver_probe_device+0x106/0x1a0 drivers/base/dd.c:738 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431 __device_attach+0x262/0x3f0 drivers/base/dd.c:912 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491 device_add+0x1630/0x19b0 drivers/base/core.c:2926 platform_device_add+0x4ad/0x6e0 drivers/base/platform.c:597 platform_device_register_full+0x448/0x530 drivers/base/platform.c:720 platform_device_register_resndata include/linux/platform_device.h:131 [inline] platform_device_register_simple include/linux/platform_device.h:160 [inline] alsa_card_dummy_init+0x1b3/0x398 sound/drivers/dummy.c:1168 do_one_initcall+0x14b/0x350 init/main.c:1205 do_initcall_level+0x101/0x14c init/main.c:1278 do_initcalls+0x59/0x9b init/main.c:1294 kernel_init_freeable+0x356/0x474 init/main.c:1514 kernel_init+0xd/0x290 init/main.c:1403 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 } ... key at: [] snd_card_new.__key.3+0x0/0x10 ... acquired at: lock_acquire+0x160/0x710 kernel/locking/lockdep.c:5442 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 snd_ctl_notify+0x86/0x550 sound/core/control.c:153 loopback_check_format sound/drivers/aloop.c:358 [inline] loopback_trigger+0xc40/0x1500 sound/drivers/aloop.c:387 snd_pcm_do_start sound/core/pcm_native.c:1350 [inline] snd_pcm_action_single sound/core/pcm_native.c:1207 [inline] snd_pcm_action sound/core/pcm_native.c:1290 [inline] snd_pcm_start+0x471/0x6c0 sound/core/pcm_native.c:1391 __snd_pcm_lib_xfer+0xf73/0x1320 sound/core/pcm_lib.c:2247 snd_pcm_oss_write3+0x209/0x330 sound/core/oss/pcm_oss.c:1221 snd_pcm_plug_write_transfer+0x28b/0x490 sound/core/oss/pcm_plugin.c:624 snd_pcm_oss_write2 sound/core/oss/pcm_oss.c:1353 [inline] snd_pcm_oss_sync1+0x299/0x770 sound/core/oss/pcm_oss.c:1594 snd_pcm_oss_sync+0x5b9/0x900 sound/core/oss/pcm_oss.c:1659 snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2546 __fput+0x34f/0x7b0 fs/file_table.c:281 task_work_run+0x137/0x1c0 kernel/task_work.c:141 get_signal+0x15cb/0x1d50 kernel/signal.c:2561 arch_do_signal+0x33/0x610 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x98/0x1f0 kernel/entry/common.c:192 syscall_exit_to_user_mode+0x82/0x1d0 kernel/entry/common.c:267 entry_SYSCALL_64_after_hwframe+0x44/0xa9 stack backtrace: CPU: 0 PID: 8504 Comm: syz-executor.0 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d6/0x29e lib/dump_stack.c:118 print_bad_irq_dependency kernel/locking/lockdep.c:2450 [inline] check_irq_usage kernel/locking/lockdep.c:2679 [inline] check_prev_add kernel/locking/lockdep.c:2868 [inline] check_prevs_add kernel/locking/lockdep.c:2989 [inline] validate_chain+0x824d/0x82c0 kernel/locking/lockdep.c:3607 __lock_acquire+0x1168/0x2bd0 kernel/locking/lockdep.c:4837 lock_acquire+0x160/0x710 kernel/locking/lockdep.c:5442 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 snd_ctl_notify+0x86/0x550 sound/core/control.c:153 loopback_check_format sound/drivers/aloop.c:358 [inline] loopback_trigger+0xc40/0x1500 sound/drivers/aloop.c:387 snd_pcm_do_start sound/core/pcm_native.c:1350 [inline] snd_pcm_action_single sound/core/pcm_native.c:1207 [inline] snd_pcm_action sound/core/pcm_native.c:1290 [inline] snd_pcm_start+0x471/0x6c0 sound/core/pcm_native.c:1391 __snd_pcm_lib_xfer+0xf73/0x1320 sound/core/pcm_lib.c:2247 snd_pcm_oss_write3+0x209/0x330 sound/core/oss/pcm_oss.c:1221 snd_pcm_plug_write_transfer+0x28b/0x490 sound/core/oss/pcm_plugin.c:624 snd_pcm_oss_write2 sound/core/oss/pcm_oss.c:1353 [inline] snd_pcm_oss_sync1+0x299/0x770 sound/core/oss/pcm_oss.c:1594 snd_pcm_oss_sync+0x5b9/0x900 sound/core/oss/pcm_oss.c:1659 snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2546 __fput+0x34f/0x7b0 fs/file_table.c:281 task_work_run+0x137/0x1c0 kernel/task_work.c:141 get_signal+0x15cb/0x1d50 kernel/signal.c:2561 arch_do_signal+0x33/0x610 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x98/0x1f0 kernel/entry/common.c:192 syscall_exit_to_user_mode+0x82/0x1d0 kernel/entry/common.c:267 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de59 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f87fee9bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: 0000000000000001 RBX: 000000000003ac40 RCX: 000000000045de59 RDX: 0000000000000001 RSI: 0000000020000140 RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffc60e2b19f R14: 00007f87fee9c9c0 R15: 000000000118bf2c