================================ WARNING: inconsistent lock state 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.4/7016 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff888029b0c148 (&timer->lock){+.?.}-{2:2}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:574 [inline] ffff888029b0c148 (&timer->lock){+.?.}-{2:2}, at: snd_timer_interrupt.part.0+0x31/0xd80 sound/core/timer.c:818 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] class_spinlock_constructor include/linux/spinlock.h:561 [inline] snd_timer_close_locked+0x65/0xbd0 sound/core/timer.c:412 snd_timer_close+0x8b/0xf0 sound/core/timer.c:464 snd_timer_user_tselect sound/core/timer.c:1694 [inline] __snd_timer_user_ioctl.isra.0+0x11a2/0x2620 sound/core/timer.c:2027 snd_timer_user_ioctl+0x7b/0xc0 sound/core/timer.c:2058 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl fs/ioctl.c:890 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 irq event stamp: 1261675 hardirqs last enabled at (1261674): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (1261674): [] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202 hardirqs last disabled at (1261675): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (1261675): [] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162 softirqs last enabled at (1260922): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (1260922): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (1261671): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (1261671): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (1261671): [] irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&timer->lock); lock(&timer->lock); *** DEADLOCK *** 1 lock held by syz-executor.4/7016: #0: ffffc90000007cb0 ((&priv->tlist)){+.-.}-{0:0}, at: call_timer_fn+0x11a/0x5b0 kernel/time/timer.c:1789 stack backtrace: CPU: 0 PID: 7016 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_usage_bug kernel/locking/lockdep.c:3971 [inline] valid_state kernel/locking/lockdep.c:4013 [inline] mark_lock_irq kernel/locking/lockdep.c:4216 [inline] mark_lock+0x923/0xc60 kernel/locking/lockdep.c:4678 mark_usage kernel/locking/lockdep.c:4567 [inline] __lock_acquire+0x13d4/0x3b30 kernel/locking/lockdep.c:5091 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 class_spinlock_irqsave_constructor include/linux/spinlock.h:574 [inline] snd_timer_interrupt.part.0+0x31/0xd80 sound/core/timer.c:818 snd_timer_interrupt sound/core/timer.c:1107 [inline] snd_timer_s_function+0x14f/0x200 sound/core/timer.c:1107 call_timer_fn+0x1a0/0x5b0 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers+0x74b/0xab0 kernel/time/timer.c:2408 __run_timer_base kernel/time/timer.c:2419 [inline] __run_timer_base kernel/time/timer.c:2412 [inline] run_timer_base+0x111/0x190 kernel/time/timer.c:2428 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2438 __do_softirq+0x218/0x8de kernel/softirq.c:554 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:633 [inline] irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200 Code: be b0 01 00 00 e8 a0 ff ff ff 31 c0 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 65 48 8b 15 04 db 76 7e 65 8b 05 05 db 76 7e a9 00 01 RSP: 0018:ffffc9000351e5b0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc9000351e690 RCX: ffffffff813ca58e RDX: ffff88807c249e00 RSI: 0000000000000004 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000004 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff902ad854 R13: ffffc9000351e688 R14: 0000000000000001 R15: 0000000000000001 unwind_next_frame+0x1b21/0x23a0 arch/x86/kernel/unwind_orc.c:648 __unwind_start+0x5aa/0x880 arch/x86/kernel/unwind_orc.c:760 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xb2/0x170 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x12e/0x360 mm/slub.c:4344 free_buffer_head+0x4e/0x110 fs/buffer.c:3017 try_to_free_buffers+0x1c5/0x2d0 fs/buffer.c:2958 filemap_release_folio+0x219/0x280 mm/filemap.c:4089 shrink_folio_list+0x2931/0x3ea0 mm/vmscan.c:1369 evict_folios+0x6e1/0x1ba0 mm/vmscan.c:4521 try_to_shrink_lruvec+0x638/0xa10 mm/vmscan.c:4726 lru_gen_shrink_lruvec mm/vmscan.c:4869 [inline] shrink_lruvec+0x2c8/0x2950 mm/vmscan.c:5647 shrink_node_memcgs mm/vmscan.c:5867 [inline] shrink_node+0x7eb/0x3750 mm/vmscan.c:5902 shrink_zones mm/vmscan.c:6144 [inline] do_try_to_free_pages+0x35e/0x19c0 mm/vmscan.c:6206 try_to_free_mem_cgroup_pages+0x31f/0x780 mm/vmscan.c:6521 try_charge_memcg+0x3d1/0x11a0 mm/memcontrol.c:2782 obj_cgroup_charge_pages mm/memcontrol.c:3301 [inline] obj_cgroup_charge+0x179/0x390 mm/memcontrol.c:3592 __memcg_slab_pre_alloc_hook mm/slub.c:1919 [inline] memcg_slab_pre_alloc_hook mm/slub.c:1940 [inline] slab_pre_alloc_hook mm/slub.c:3751 [inline] slab_alloc_node mm/slub.c:3827 [inline] kmem_cache_alloc+0x2ba/0x320 mm/slub.c:3852 alloc_pid+0xd8/0xe10 kernel/pid.c:187 copy_process+0x3acd/0x9160 kernel/fork.c:2405 kernel_clone+0xfd/0x940 kernel/fork.c:2796 __do_sys_clone+0xba/0x100 kernel/fork.c:2939 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f200bc7ae93 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffd67b9b5c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f200bc7ae93 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 000055556f759750 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 NMI backtrace for cpu 0 CPU: 0 PID: 9127 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:fast_imageblit drivers/video/fbdev/core/sysimgblt.c:264 [inline] RIP: 0010:sys_imageblit+0x19a6/0x21d0 drivers/video/fbdev/core/sysimgblt.c:326 Code: 85 4a 04 00 00 89 4d 18 41 0f b6 45 00 44 21 f8 3c 0f 0f b6 d0 0f 87 44 04 00 00 49 8d 3c 94 48 83 c5 20 48 89 f8 48 c1 e8 03 <42> 0f b6 0c 30 48 89 f8 83 e0 07 83 c0 03 38 c8 7c 08 84 c9 0f 85 RSP: 0018:ffffc90003bcf370 EFLAGS: 00000a02 RAX: 1ffff92000779e89 RBX: 00000000000000d3 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff84c07381 RDI: ffffc90003bcf448 RBP: ffffc90003f3fcb0 R08: 0000000000000005 R09: 0000000000000007 R10: 00000000000000d3 R11: 0000000000000000 R12: ffffc90003bcf448 R13: ffff8880207f1746 R14: dffffc0000000000 R15: 0000000000000001 FS: 00007fb6ac8266c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020002024 CR3: 0000000030be4000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: drm_fbdev_generic_defio_imageblit+0x20/0x130 drivers/gpu/drm/drm_fbdev_generic.c:37 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x90e/0xdf0 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x314/0x3d0 drivers/video/fbdev/core/fbcon.c:1283 fbcon_redraw+0x445/0x4e0 drivers/video/fbdev/core/fbcon.c:1658 fbcon_scroll+0x415/0x5b0 drivers/video/fbdev/core/fbcon.c:1831 con_scroll+0x45e/0x690 drivers/tty/vt/vt.c:577 lf+0x270/0x2c0 drivers/tty/vt/vt.c:1461 do_con_trol drivers/tty/vt/vt.c:2149 [inline] do_con_write+0x19eb/0x7f50 drivers/tty/vt/vt.c:2905 con_write+0x23/0xc0 drivers/tty/vt/vt.c:3251 process_output_block drivers/tty/n_tty.c:574 [inline] n_tty_write+0x423/0x1150 drivers/tty/n_tty.c:2379 iterate_tty_write drivers/tty/tty_io.c:1021 [inline] file_tty_write.constprop.0+0x518/0x9b0 drivers/tty/tty_io.c:1096 call_write_iter include/linux/fs.h:2108 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6db/0x1100 fs/read_write.c:590 ksys_write+0x12f/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fb6aba7de69 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb6ac8260c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fb6abbabf80 RCX: 00007fb6aba7de69 RDX: 000000000000009b RSI: 0000000020001040 RDI: 0000000000000004 RBP: 00007fb6abaca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fb6abbabf80 R15: 00007fff2c6a5798 ---------------- Code disassembly (best guess): 0: be b0 01 00 00 mov $0x1b0,%esi 5: e8 a0 ff ff ff call 0xffffffaa a: 31 c0 xor %eax,%eax c: c3 ret d: cc int3 e: cc int3 f: cc int3 10: cc int3 11: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) 18: 00 00 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop 28: 90 nop 29: 90 nop * 2a: f3 0f 1e fa endbr64 <-- trapping instruction 2e: 65 48 8b 15 04 db 76 mov %gs:0x7e76db04(%rip),%rdx # 0x7e76db3a 35: 7e 36: 65 8b 05 05 db 76 7e mov %gs:0x7e76db05(%rip),%eax # 0x7e76db42 3d: a9 .byte 0xa9 3e: 00 01 add %al,(%rcx)