Stefano Garzarella <sgarzare@xxxxxxxxxx> 于2020年10月1日周四 上午10:59写道： > > +Cc: qemu-devel@xxxxxxxxxx > > Hi, > > On Thu, Oct 01, 2020 at 01:26:51AM +0900, Ju Hyung Park wrote: > > Hi everyone. > > > > I have recently switched to a setup running QEMU 5.0(which supports > > io_uring) for a Windows 10 guest on Linux v5.4.63. > > The QEMU hosts /dev/nvme0n1p3 to the guest with virtio-blk with > > discard/unmap enabled. > > Please, can you share the qemu command line that you are using? > This can be useful for the analysis. > > Thanks, > Stefano > > > > > I've been having a weird issue where the system would randomly hang > > whenever I turn on or shutdown the guest. The host will stay up for a > > bit and then just hang. No response on SSH, etc. Even ping doesn't > > work. > > > > It's been hard to even get a log to debug the issue, but I've been > > able to get a show-backtrace-all-active-cpus sysrq dmesg on the most > > recent encounter with the issue and it's showing some io_uring > > functions. > > > > Since I've been encountering the issue ever since I switched to QEMU > > 5.0, I suspect io_uring may be the culprit to the issue. > > > > While I'd love to try out the mainline kernel, it's currently not > > feasible at the moment as I have to stay in linux-5.4.y. Backporting > > mainline's io_uring also seems to be a non-trivial job. > > > > Any tips would be appreciated. I can build my own kernel and I'm > > willing to try out (backported) patches. > > > > Thanks. > > > > [243683.539303] NMI backtrace for cpu 1 > > [243683.539303] CPU: 1 PID: 1527 Comm: qemu-system-x86 Tainted: P > > W O 5.4.63+ #1 > > [243683.539303] Hardware name: System manufacturer System Product > > Name/PRIME Z370-A, BIOS 2401 07/12/2019 > > [243683.539304] RIP: 0010:io_uring_flush+0x98/0x140 > > [243683.539304] Code: e4 74 70 48 8b 93 e8 02 00 00 48 8b 32 48 8b 4a > > 08 48 89 4e 08 48 89 31 48 89 12 48 89 52 08 48 8b 72 f8 81 4a a8 00 > > 40 00 00 <48> 85 f6 74 15 4c 3b 62 c8 75 0f ba 01 00 00 00 bf 02 00 00 > > 00 e8 > > [243683.539304] RSP: 0018:ffff8881f20c3e28 EFLAGS: 00000006 > > [243683.539305] RAX: ffff888419cd94e0 RBX: ffff88842ba49800 RCX: > > ffff888419cd94e0 > > [243683.539305] RDX: ffff888419cd94e0 RSI: ffff888419cd94d0 RDI: > > ffff88842ba49af8 > > [243683.539306] RBP: ffff88842ba49af8 R08: 0000000000000001 R09: > > ffff88840d17aaf8 > > [243683.539306] R10: 0000000000000001 R11: 00000000ffffffec R12: > > ffff88843c68c080 > > [243683.539306] R13: ffff88842ba49ae8 R14: 0000000000000001 R15: > > 0000000000000000 > > [243683.539307] FS: 0000000000000000(0000) GS:ffff88843ea80000(0000) > > knlGS:0000000000000000 > > [243683.539307] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [243683.539307] CR2: 00007f3234b31f90 CR3: 0000000002608001 CR4: > > 00000000003726e0 > > [243683.539307] Call Trace: > > [243683.539308] ? filp_close+0x2a/0x60 > > [243683.539308] ? put_files_struct.part.0+0x57/0xb0 > > [243683.539309] ? do_exit+0x321/0xa70 > > [243683.539309] ? do_group_exit+0x35/0x90 > > [243683.539309] ? __x64_sys_exit_group+0xf/0x10 > > [243683.539309] ? do_syscall_64+0x41/0x160 > > [243683.539309] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > [243684.753272] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: > > [243684.753278] rcu: 1-...0: (1 GPs behind) > > idle=a5e/1/0x4000000000000000 softirq=7893711/7893712 fqs=2955 > > [243684.753280] (detected by 3, t=6002 jiffies, g=17109677, q=117817) > > [243684.753282] Sending NMI from CPU 3 to CPUs 1: > > [243684.754285] NMI backtrace for cpu 1 > > [243684.754285] CPU: 1 PID: 1527 Comm: qemu-system-x86 Tainted: P > > W O 5.4.63+ #1 > > [243684.754286] Hardware name: System manufacturer System Product > > Name/PRIME Z370-A, BIOS 2401 07/12/2019 > > [243684.754286] RIP: 0010:io_uring_flush+0x83/0x140 > > [243684.754287] Code: 89 ef e8 00 36 92 00 48 8b 83 e8 02 00 00 49 39 > > c5 74 52 4d 85 e4 74 70 48 8b 93 e8 02 00 00 48 8b 32 48 8b 4a 08 48 > > 89 4e 08 <48> 89 31 48 89 12 48 89 52 08 48 8b 72 f8 81 4a a8 00 40 00 > > 00 48 > > [243684.754287] RSP: 0018:ffff8881f20c3e28 EFLAGS: 00000002 > > [243684.754288] RAX: ffff888419cd94e0 RBX: ffff88842ba49800 RCX: > > ffff888419cd94e0 > > [243684.754288] RDX: ffff888419cd94e0 RSI: ffff888419cd94e0 RDI: > > ffff88842ba49af8 > > [243684.754289] RBP: ffff88842ba49af8 R08: 0000000000000001 R09: > > ffff88840d17aaf8 > > [243684.754289] R10: 0000000000000001 R11: 00000000ffffffec R12: > > ffff88843c68c080 > > [243684.754289] R13: ffff88842ba49ae8 R14: 0000000000000001 R15: > > 0000000000000000 > > [243684.754290] FS: 0000000000000000(0000) GS:ffff88843ea80000(0000) > > knlGS:0000000000000000 > > [243684.754290] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [243684.754291] CR2: 00007f3234b31f90 CR3: 0000000002608001 CR4: > > 00000000003726e0 > > [243684.754291] Call Trace: > > [243684.754291] ? filp_close+0x2a/0x60 > > [243684.754291] ? put_files_struct.part.0+0x57/0xb0 > > [243684.754292] ? do_exit+0x321/0xa70 > > [243684.754292] ? do_group_exit+0x35/0x90 > > [243684.754292] ? __x64_sys_exit_group+0xf/0x10 > > [243684.754293] ? do_syscall_64+0x41/0x160 > > [243684.754293] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > > > I got something similar [250145.410520] general protection fault: 0000 [#1] SMP [250145.410868] CPU: 5 PID: 39269 Comm: qemu-5.0 Kdump: loaded Tainted: G O 5.4.61-pserver #5.4.61-1+develop20200831.1341+7430880~deb10 [250145.411468] Hardware name: Supermicro Super Server/X11DDW-L, BIOS 3.3 02/21/2020 [250145.412051] RIP: 0010:io_cancel_async_work+0x48/0xa0 [250145.412386] Code: fb 48 8d bf f8 02 00 00 48 89 f5 e8 02 f1 69 00 48 8b 83 e8 02 00 00 49 39 c4 74 52 48 8b 83 e8 02 00 00 48 8b 08 48 8b 50 08 <48> 89 51 08 48 8 9 0a 48 8b 70 f8 48 89 00 48 89 40 08 81 48 a8 00 [250145.413239] RSP: 0018:ffffc2d34efb7cf8 EFLAGS: 00010083 [250145.413576] RAX: ffffec9879729a80 RBX: ffff9fa2740ac400 RCX: 06ffff8000000000 [250145.414153] RDX: ffff9fa2740ac6e8 RSI: ffffec9879729a40 RDI: ffff9fa2740ac6f8 [250145.414729] RBP: ffff9fa1cf86c080 R08: ffff9fa199ccecf8 R09: 8000002f724b7067 [250145.415307] R10: ffffc2d34efb7b8c R11: 0000000000000003 R12: ffff9fa2740ac6e8 [250145.415884] R13: 0000000000000000 R14: 000000000000000d R15: ffff9fa1af48e068 [250145.416461] FS: 0000000000000000(0000) GS:ffff9fa280940000(0000) knlGS:0000000000000000 [250145.417042] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [250145.417380] CR2: 00007f5f14188000 CR3: 0000002f0c408005 CR4: 00000000007626e0 [250145.417957] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [250145.418535] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [250145.419112] PKRU: 55555554 [250145.419438] Call Trace: [250145.419768] io_uring_flush+0x34/0x50 [250145.420101] filp_close+0x31/0x60 [250145.420432] put_files_struct+0x6c/0xc0 [250145.420767] do_exit+0x347/0xa50 [250145.421097] do_group_exit+0x3a/0x90 [250145.421429] get_signal+0x125/0x7d0 [250145.421761] do_signal+0x36/0x640 [250145.422090] ? do_send_sig_info+0x5c/0x90 [250145.422423] ? recalc_sigpending+0x17/0x50 [250145.422757] exit_to_usermode_loop+0x61/0xd0 [250145.423090] do_syscall_64+0xe6/0x120 [250145.423424] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [250145.423761] RIP: 0033:0x7f5f176997bb
