On Fri, Mar 5, 2021 at 9:56 PM syzbot <syzbot+a4c8bc1d1dc7b620630d@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 280d542f Merge tag 'drm-fixes-2021-03-05' of git://anongit.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=138c7a92d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=dc4003509ab3fc78 > dashboard link: https://syzkaller.appspot.com/bug?extid=a4c8bc1d1dc7b620630d > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+a4c8bc1d1dc7b620630d@xxxxxxxxxxxxxxxxxxxxxxxxx +Mark, I've enabled CONFIG_DEBUG_IRQFLAGS on syzbot and it led to this breakage. Is it a bug in kvm_wait or in the debugging code itself? If it's a real bug, I would assume it's pretty bad as it happens all the time. > ------------[ cut here ]------------ > raw_local_irq_restore() called with IRQs enabled > WARNING: CPU: 2 PID: 213 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10 > Modules linked in: > CPU: 2 PID: 213 Comm: kworker/u17:4 Not tainted 5.12.0-rc1-syzkaller #0 > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 > Workqueue: events_unbound call_usermodehelper_exec_work > > RIP: 0010:warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10 > Code: be ff cc cc cc cc cc cc cc cc cc cc cc 80 3d e4 38 af 04 00 74 01 c3 48 c7 c7 a0 8f 6b 89 c6 05 d3 38 af 04 01 e8 e7 b9 be ff <0f> 0b c3 48 39 77 10 0f 84 97 00 00 00 66 f7 47 22 f0 ff 74 4b 48 > RSP: 0000:ffffc90000fe7770 EFLAGS: 00010286 > > RAX: 0000000000000000 RBX: ffffffff8c0e9c68 RCX: 0000000000000000 > RDX: ffff8880116bc3c0 RSI: ffffffff815c0cf5 RDI: fffff520001fcee0 > RBP: 0000000000000200 R08: 0000000000000000 R09: 0000000000000001 > R10: ffffffff815b9a5e R11: 0000000000000000 R12: 0000000000000003 > R13: fffffbfff181d38d R14: 0000000000000001 R15: ffff88802cc36000 > FS: 0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000000 CR3: 000000000bc8e000 CR4: 0000000000150ee0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > kvm_wait arch/x86/kernel/kvm.c:860 [inline] > kvm_wait+0xc9/0xe0 arch/x86/kernel/kvm.c:837 > 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+0x8b8/0xb40 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+0x200/0x2b0 kernel/locking/spinlock_debug.c:113 > spin_lock include/linux/spinlock.h:354 [inline] > copy_fs_struct+0x1c8/0x340 fs/fs_struct.c:123 > copy_fs kernel/fork.c:1443 [inline] > copy_process+0x4dc2/0x6fd0 kernel/fork.c:2088 > kernel_clone+0xe7/0xab0 kernel/fork.c:2462 > kernel_thread+0xb5/0xf0 kernel/fork.c:2514 > call_usermodehelper_exec_work kernel/umh.c:172 [inline] > call_usermodehelper_exec_work+0xcc/0x180 kernel/umh.c:158 > process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 > worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 > kthread+0x3b1/0x4a0 kernel/kthread.c:292 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 > > > --- > 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. > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000ccbedd05bcd0504e%40google.com.
