Hello,
syzbot found the following issue on:
HEAD commit: 144c79ef Merge tag 'perf-tools-fixes-for-v5.12-2020-03-07'.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16972ea2d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9008fb06fa15d749 dashboard link: https://syzkaller.appspot.com/bug?extid=b0b2da1e0f732c818975 compiler: Debian clang version 11.0.1-2
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b0b2da1e0f732c818975@syzkaller.appspotmail.com
------------[ cut here ]------------ raw_local_irq_restore() called with IRQs enabled WARNING: CPU: 1 PID: 10032 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x1f/0x30 kernel/locking/irqflag-debug.c:10 Modules linked in: CPU: 1 PID: 10032 Comm: syz-executor.2 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:warn_bogus_irq_restore+0x1f/0x30 kernel/locking/irqflag-debug.c:10 Code: cc cc cc cc cc cc cc cc cc cc cc 80 3d 73 49 54 04 00 74 01 c3 c6 05 69 49 54 04 01 48 c7 c7 60 5d ae 89 31 c0 e8 41 1f fa f7 <0f> 0b c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc 41 56 53 48 83 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 10032 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x2c1/0x320 drivers/gpu/drm/vkms/vkms_crtc.c:21 Modules linked in: CPU: 1 PID: 10032 Comm: syz-executor.2 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:vkms_vblank_simulate+0x2c1/0x320 drivers/gpu/drm/vkms/vkms_crtc.c:21 Code: 00 00 00 48 c7 c6 a0 28 28 8a 31 c0 e8 18 71 ef ff b8 01 00 00 00 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 df e0 13 fd <0f> 0b e9 e8 fd ff ff 89 d9 80 e1 07 38 c1 0f 8c 5c fe ff ff 48 89 RSP: 0018:ffffc90000dc04a8 EFLAGS: 00010046 RAX: ffffffff8464ccc1 RBX: 0000000000000002 RCX: ffff8880155bb780 RDX: 0000000000010103 RSI: 0000000000000002 RDI: 0000000000000001 RBP: ffff8880b9d26260 R08: ffffffff8464caa1 R09: fffffbfff1b6a1e6 R10: fffffbfff1b6a1e6 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff110033593d2 R14: 0000000000fe4c00 R15: ffff888019ac8d30 FS: 0000000001b6c400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002e97708 CR3: 000000001ba55000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x4c9/0xa00 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x393/0xf70 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x3e/0xb0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:console_unlock+0xaab/0xe00 kernel/printk/printk.c:2586 Code: 84 5a f7 ff ff eb 29 e8 73 53 18 00 e8 2e 68 ed 07 4d 85 f6 74 df 66 0f 1f 84 00 00 00 00 00 e8 5b 53 18 00 fb f6 44 24 0f 01 <0f> 84 2f f7 ff ff e8 4a 53 18 00 48 c7 c7 b4 4d 6f 8b be 1b 0a 00 RSP: 0018:ffffc90000dc0800 EFLAGS: 00000246 RAX: ffffffff81605a45 RBX: 0000000000000000 RCX: ffff8880155bb780 RDX: 0000000000000103 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000dc0918 R08: ffffffff81605a02 R09: fffffbfff1f27aa9 R10: fffffbfff1f27aa9 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffffffff19ed295 R14: 0000000000000200 R15: 1ffffffff19ed28e vprintk_emit+0x1ab/0x270 kernel/printk/printk.c:2098 printk+0x62/0x83 kernel/printk/printk.c:2146 show_opcodes+0xc1/0xe0 arch/x86/kernel/dumpstack.c:129 show_ip arch/x86/kernel/dumpstack.c:150 [inline] show_iret_regs+0x2f/0x60 arch/x86/kernel/dumpstack.c:155 __show_regs+0x29/0x580 arch/x86/kernel/process_64.c:73 show_regs+0x35/0x60 arch/x86/kernel/dumpstack.c:469 __warn+0x12f/0x270 kernel/panic.c:595 report_bug+0x1b1/0x2e0 lib/bug.c:195 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:259 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:575 RIP: 0010:warn_bogus_irq_restore+0x1f/0x30 kernel/locking/irqflag-debug.c:10 Code: cc cc cc cc cc cc cc cc cc cc cc 80 3d 73 49 54 04 00 74 01 c3 c6 05 69 49 54 04 01 48 c7 c7 60 5d ae 89 31 c0 e8 41 1f fa f7 <0f> 0b c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc 41 56 53 48 83 RSP: 0018:ffffc90000dc0c78 EFLAGS: 00010246 RAX: 74fd7735e664bd00 RBX: ffff888019090088 RCX: ffff8880155bb780 RDX: 0000000000000102 RSI: 0000000000000102 RDI: 0000000000000000 RBP: 1ffff920001b8190 R08: ffffffff81605e52 R09: ffffed10173a3f1c R10: ffffed10173a3f1c R11: 0000000000000000 R12: 0000000000000003 R13: ffff88823ffe6dc0 R14: 0000000000000246 R15: dffffc0000000000 kvm_wait+0x10e/0x160 arch/x86/kernel/kvm.c:860 pv_wait arch/x86/include/asm/paravirt.h:564 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline] __pv_queued_spin_lock_slowpath+0x6b5/0xb90 kernel/locking/qspinlock.c:508 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock+0x430/0x810 kernel/locking/spinlock_debug.c:113 spin_lock include/linux/spinlock.h:354 [inline] tcp_tsq_handler+0x20/0x1f0 net/ipv4/tcp_output.c:1029 tcp_tasklet_func+0x403/0x450 net/ipv4/tcp_output.c:1063 tasklet_action_common+0x11c/0x3f0 kernel/softirq.c:557 __do_softirq+0x318/0x714 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu+0x1d8/0x200 kernel/softirq.c:422 irq_exit_rcu+0x5/0x20 kernel/softirq.c:434 common_interrupt+0xa1/0xc0 arch/x86/kernel/irq.c:240 </IRQ> asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:623 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x7a/0xc0 kernel/locking/spinlock.c:191 Code: 00 fc ff df 80 3c 08 00 74 08 48 89 e7 e8 0e f9 6c f8 f7 04 24 00 02 00 00 75 37 41 f7 c6 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 81 7f 02 f8 65 8b 05 a2 e4 b1 76 85 c0 74 28 65 48 8b 04 25 28 RSP: 0018:ffffc90016f27d88 EFLAGS: 00000206 RAX: 1ffff92002de4fb1 RBX: ffff8880b9d26180 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff817eade0 R09: ffffed10173a4c31 R10: ffffed10173a4c31 R11: 0000000000000000 R12: ffffc90016f27e58 R13: 00000000000f4240 R14: 0000000000000286 R15: 0000000000000001 hrtimer_start_expires include/linux/hrtimer.h:436 [inline] hrtimer_sleeper_start_expires kernel/time/hrtimer.c:1799 [inline] do_nanosleep+0x17c/0x740 kernel/time/hrtimer.c:1875 hrtimer_nanosleep+0x1b9/0x350 kernel/time/hrtimer.c:1931 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1267 [inline] __se_sys_clock_nanosleep kernel/time/posix-timers.c:1245 [inline] __x64_sys_clock_nanosleep+0x2f6/0x340 kernel/time/posix-timers.c:1245 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x48a631 Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 aa e2 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 e3 e2 ff ff 48 8b 04 24 eb 97 66 2e 0f 1f RSP: 002b:00007ffee856c320 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 000000000002189a RCX: 000000000048a631 RDX: 00007ffee856c360 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000056bf60 R13: 000000000056c9e0 R14: 000000000056bf60 R15: 0000000000021559
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