Hello, syzbot found the following issue on: HEAD commit: e143016b56ec Add linux-next specific files for 20230913 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=164c5ac7a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=76ee1517f109f01a dashboard link: https://syzkaller.appspot.com/bug?extid=204dd7e9a83cb8855b63 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/845fe7fc2fee/disk-e143016b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d74646a84425/vmlinux-e143016b.xz kernel image: https://storage.googleapis.com/syzbot-assets/bfbe2696ea96/bzImage-e143016b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+204dd7e9a83cb8855b63@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================== WARNING: bad unlock balance detected! 6.6.0-rc1-next-20230913-syzkaller #0 Not tainted ------------------------------------- swapper/0/0 is trying to release lock (&vkms_out->enabled_lock) at: [<ffffffff852f4539>] vkms_vblank_simulate+0x159/0x3d0 drivers/gpu/drm/vkms/vkms_crtc.c:34 but there are no more locks to release! other info that might help us debug this: no locks held by swapper/0/0. stack backtrace: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.6.0-rc1-next-20230913-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 __lock_release kernel/locking/lockdep.c:5430 [inline] lock_release+0x4b5/0x680 kernel/locking/lockdep.c:5773 __mutex_unlock_slowpath+0xa3/0x640 kernel/locking/mutex.c:907 vkms_vblank_simulate+0x159/0x3d0 drivers/gpu/drm/vkms/vkms_crtc.c:34 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x203/0xc10 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1063 [inline] __sysvec_apic_timer_interrupt+0x105/0x3f0 arch/x86/kernel/apic/apic.c:1080 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1074 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline] RIP: 0010:acpi_safe_halt+0x1b/0x20 drivers/acpi/processor_idle.c:113 Code: ed c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 65 48 8b 04 25 c0 bc 03 00 48 8b 00 a8 08 75 0c 66 90 0f 00 2d 17 b9 b2 00 fb f4 <fa> c3 0f 1f 00 0f b6 47 08 3c 01 74 0b 3c 02 74 05 8b 7f 04 eb 9f RSP: 0000:ffffffff8c807d70 EFLAGS: 00000246 RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8a41858e RDX: 0000000000000001 RSI: ffff88801368d800 RDI: ffff88801368d864 RBP: ffff88801368d864 R08: 0000000000000001 R09: ffffed1017306dbd R10: ffff8880b9836deb R11: 0000000000000000 R12: ffff888017300000 R13: ffffffff8d661d60 R14: 0000000000000000 R15: 0000000000000000 acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:707 cpuidle_enter_state+0x82/0x500 drivers/cpuidle/cpuidle.c:267 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388 cpuidle_idle_call kernel/sched/idle.c:215 [inline] do_idle+0x315/0x3f0 kernel/sched/idle.c:282 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379 rest_init+0x16f/0x2b0 init/main.c:726 arch_call_rest_init+0x13/0x30 init/main.c:823 start_kernel+0x39f/0x480 init/main.c:1068 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:556 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:537 secondary_startup_64_no_verify+0x166/0x16b </TASK> ---------------- Code disassembly (best guess): 0: ed in (%dx),%eax 1: c3 ret 2: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 9: 00 00 00 00 d: 66 90 xchg %ax,%ax f: 65 48 8b 04 25 c0 bc mov %gs:0x3bcc0,%rax 16: 03 00 18: 48 8b 00 mov (%rax),%rax 1b: a8 08 test $0x8,%al 1d: 75 0c jne 0x2b 1f: 66 90 xchg %ax,%ax 21: 0f 00 2d 17 b9 b2 00 verw 0xb2b917(%rip) # 0xb2b93f 28: fb sti 29: f4 hlt * 2a: fa cli <-- trapping instruction 2b: c3 ret 2c: 0f 1f 00 nopl (%rax) 2f: 0f b6 47 08 movzbl 0x8(%rdi),%eax 33: 3c 01 cmp $0x1,%al 35: 74 0b je 0x42 37: 3c 02 cmp $0x2,%al 39: 74 05 je 0x40 3b: 8b 7f 04 mov 0x4(%rdi),%edi 3e: eb 9f jmp 0xffffffdf --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
