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Message-ID: <Z1KSj7i8S1+2ZrSi@ly-workstation>
Date: Fri, 6 Dec 2024 13:58:39 +0800
From: "Lai, Yi" <yi1.lai@...ux.intel.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
David Ahern <dsahern@...nel.org>, Jakub Kicinski <kuba@...nel.org>,
Simon Horman <horms@...nel.org>, sashal@...nel.org
Subject: Re: [PATCH net] ipmr: fix build with clang and DEBUG_NET disabled.
On Thu, Dec 05, 2024 at 07:47:03AM +0100, Eric Dumazet wrote:
> On Thu, Dec 5, 2024 at 7:22 AM Lai, Yi <yi1.lai@...ux.intel.com> wrote:
> >
> > On Thu, Nov 28, 2024 at 05:18:04PM +0100, Paolo Abeni wrote:
> > > Sasha reported a build issue in ipmr::
> > >
> > > net/ipv4/ipmr.c:320:13: error: function 'ipmr_can_free_table' is not \
> > > needed and will not be emitted \
> > > [-Werror,-Wunneeded-internal-declaration]
> > > 320 | static bool ipmr_can_free_table(struct net *net)
> > >
> > > Apparently clang is too smart with BUILD_BUG_ON_INVALID(), let's
> > > fallback to a plain WARN_ON_ONCE().
> > >
> > > Reported-by: Sasha Levin <sashal@...nel.org>
> > > Closes: https://qa-reports.linaro.org/lkft/sashal-linus-next/build/v6.11-25635-g6813e2326f1e/testrun/26111580/suite/build/test/clang-nightly-lkftconfig/details/
> > > Fixes: 11b6e701bce9 ("ipmr: add debug check for mr table cleanup")
> > > Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> > > ---
> > > net/ipv4/ipmr.c | 2 +-
> > > net/ipv6/ip6mr.c | 2 +-
> > > 2 files changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
> > > index 383ea8b91cc7..c5b8ec5c0a8c 100644
> > > --- a/net/ipv4/ipmr.c
> > > +++ b/net/ipv4/ipmr.c
> > > @@ -437,7 +437,7 @@ static void ipmr_free_table(struct mr_table *mrt)
> > > {
> > > struct net *net = read_pnet(&mrt->net);
> > >
> > > - DEBUG_NET_WARN_ON_ONCE(!ipmr_can_free_table(net));
> > > + WARN_ON_ONCE(!ipmr_can_free_table(net));
> > >
> > > timer_shutdown_sync(&mrt->ipmr_expire_timer);
> > > mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC |
> > > diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
> > > index 4147890fe98f..7f1902ac3586 100644
> > > --- a/net/ipv6/ip6mr.c
> > > +++ b/net/ipv6/ip6mr.c
> > > @@ -416,7 +416,7 @@ static void ip6mr_free_table(struct mr_table *mrt)
> > > {
> > > struct net *net = read_pnet(&mrt->net);
> > >
> > > - DEBUG_NET_WARN_ON_ONCE(!ip6mr_can_free_table(net));
> > > + WARN_ON_ONCE(!ip6mr_can_free_table(net));
> > >
> > > timer_shutdown_sync(&mrt->ipmr_expire_timer);
> > > mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC |
> > > --
> > > 2.45.2
> > >
> >
> > Hi Paolo Abeni,
> >
> > Greetings!
> >
> > I used Syzkaller and found that there is WARNING in ip6mr_free_table in linux v6.13-rc1.
> >
> > After bisection and the first bad commit is:
> > "
> > f6d7695b5ae22092fa2cc42529bb7462f7e0c4ad ipmr: fix build with clang and DEBUG_NET disabled
> > "
> >
> > Please help take a look if the WARNING is triggerd expectedly. I hope following records can be insightful for you.
> >
>
> Hi there
>
> Probably fixed already in net tree with :
>
> 50b94204446e1215af081fd713d7d566d9258e35 ipmr: tune the
> ipmr_can_free_table() checks.
>
> Thank you
>
Thanks for the info. I have tried net-next latest main branch
1daa6591ab7d (HEAD -> main, origin/main, origin/HEAD) Merge branch
'net_sched-sch_sfq-reject-limit-of-1'.
The WARNING in ip6mr_free_table is fixed. However, the WARNING in
ipmr_rules_exit can still be observed.
[ 47.037578] ------------[ cut here ]------------
[ 47.038326] WARNING: CPU: 0 PID: 840 at net/ipv4/ipmr.c:440 ipmr_rules_exit+0x14b/0x1d0
[ 47.039574] Modules linked in:
[ 47.040005] CPU: 0 UID: 0 PID: 840 Comm: repro Not tainted 6.13.0-rc1net-tree+ #1
[ 47.040959] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/4
[ 47.042538] RIP: 0010:ipmr_rules_exit+0x14b/0x1d0
[ 47.043182] Code: df 48 c1 ea 03 80 3c 02 00 75 7b 48 c7 83 08 08 00 00 00 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc 6
[ 47.045522] RSP: 0000:ffff888030057bc0 EFLAGS: 00010293
[ 47.046207] RAX: 0000000000000000 RBX: ffff888013fbb880 RCX: ffffffff853c08db
[ 47.047216] RDX: ffff88803016abc0 RSI: ffffffff853c094b RDI: 0000000000000005
[ 47.048140] RBP: ffff888030057be8 R08: 0000000000000000 R09: ffffed10027f7738
[ 47.049064] R10: 0000000000000001 R11: 0000000000000001 R12: ffff888030722000
[ 47.049985] R13: 0000000000000001 R14: ffff888013fbc088 R15: ffff888013fbb880
[ 47.050940] FS: 00007facb93cd640(0000) GS:ffff88806c400000(0000) knlGS:0000000000000000
[ 47.051979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 47.052729] CR2: 00007f897b683e80 CR3: 000000001439a005 CR4: 0000000000770ef0
[ 47.053652] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 47.054594] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 47.055516] PKRU: 55555554
[ 47.055883] Call Trace:
[ 47.056217] <TASK>
[ 47.056533] ? show_regs+0x6d/0x80
[ 47.057020] ? __warn+0xf3/0x390
[ 47.057485] ? report_bug+0x25e/0x4b0
[ 47.058006] ? ipmr_rules_exit+0x14b/0x1d0
[ 47.058600] ? report_bug+0x2cb/0x4b0
[ 47.059133] ? ipmr_rules_exit+0x14b/0x1d0
[ 47.059711] ? ipmr_rules_exit+0x14c/0x1d0
[ 47.060291] ? handle_bug+0xf1/0x190
[ 47.060788] ? exc_invalid_op+0x3c/0x80
[ 47.061310] ? asm_exc_invalid_op+0x1f/0x30
[ 47.061900] ? ipmr_rules_exit+0xdb/0x1d0
[ 47.062508] ? ipmr_rules_exit+0x14b/0x1d0
[ 47.063080] ? ipmr_rules_exit+0x14b/0x1d0
[ 47.063668] ipmr_net_exit_batch+0x5d/0xb0
[ 47.064232] ? __pfx_ipmr_net_exit_batch+0x10/0x10
[ 47.064888] ? __pfx_ipmr_net_exit+0x10/0x10
[ 47.065479] ops_exit_list+0x132/0x190
[ 47.066005] setup_net+0x502/0x840
[ 47.066521] ? __pfx_setup_net+0x10/0x10
[ 47.067065] ? __pfx_down_read_killable+0x10/0x10
[ 47.067715] ? __mutex_init+0xfd/0x140
[ 47.068271] copy_net_ns+0x2bb/0x6e0
[ 47.068802] create_new_namespaces+0x403/0xb40
[ 47.069452] unshare_nsproxy_namespaces+0xca/0x200
[ 47.070090] ksys_unshare+0x482/0xae0
[ 47.070622] ? __pfx_ksys_unshare+0x10/0x10
[ 47.071197] ? __audit_syscall_entry+0x39c/0x500
[ 47.071840] __x64_sys_unshare+0x3a/0x50
[ 47.072376] x64_sys_call+0xd3e/0x2140
[ 47.072886] do_syscall_64+0x6d/0x140
[ 47.073383] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 47.074053] RIP: 0033:0x7facb903ee5d
[ 47.074574] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 8
[ 47.076927] RSP: 002b:00007facb93ccca8 EFLAGS: 00000297 ORIG_RAX: 0000000000000110
[ 47.077913] RAX: ffffffffffffffda RBX: 00007facb93cd640 RCX: 00007facb903ee5d
[ 47.078856] RDX: 00007facb903ee5d RSI: 0000000000000000 RDI: 0000000064040280
[ 47.079781] RBP: 00007facb93ccd60 R08: 0000000100000001 R09: 0000000000000000
[ 47.080702] R10: 0000000100000001 R11: 0000000000000297 R12: 00007facb93cd640
[ 47.081622] R13: 0000000000000006 R14: 00007facb909f560 R15: 0000000000000000
[ 47.082618] </TASK>
[ 47.082934] irq event stamp: 56841
[ 47.083403] hardirqs last enabled at (56849): [<ffffffff814606d5>] __up_console_sem+0x95/0xb0
[ 47.084546] hardirqs last disabled at (56856): [<ffffffff814606ba>] __up_console_sem+0x7a/0xb0
[ 47.085688] softirqs last enabled at (56588): [<ffffffff8128c01e>] __irq_exit_rcu+0x10e/0x170
[ 47.086857] softirqs last disabled at (56571): [<ffffffff8128c01e>] __irq_exit_rcu+0x10e/0x170
[ 47.087967] ---[ end trace 0000000000000000 ]---
Is this expected?
> > All detailed into can be found at:
> > https://github.com/laifryiee/syzkaller_logs/tree/main/241204_202439_ip6mr_free_table
> > Syzkaller repro code:
> > https://github.com/laifryiee/syzkaller_logs/tree/main/241204_202439_ip6mr_free_table/repro.c
> > Syzkaller repro syscall steps:
> > https://github.com/laifryiee/syzkaller_logs/tree/main/241204_202439_ip6mr_free_table/repro.prog
> > Syzkaller report:
> > https://github.com/laifryiee/syzkaller_logs/tree/main/241204_202439_ip6mr_free_table/repro.report
> > Kconfig(make olddefconfig):
> > https://github.com/laifryiee/syzkaller_logs/tree/main/241204_202439_ip6mr_free_table/kconfig_origin
> > Bisect info:
> > https://github.com/laifryiee/syzkaller_logs/tree/main/241204_202439_ip6mr_free_table/bisect_info.log
> > bzImage:
> > https://github.com/laifryiee/syzkaller_logs/raw/refs/heads/main/241204_202439_ip6mr_free_table/bzImage_2b2d5f55fa44b37555edcdbbaf3acdb821e456a5
> > Issue dmesg:
> > https://github.com/laifryiee/syzkaller_logs/blob/main/241204_202439_ip6mr_free_table/2b2d5f55fa44b37555edcdbbaf3acdb821e456a5_dmesg.log
> >
> > "
> > [ 106.095480] ------------[ cut here ]------------
> > [ 106.096382] WARNING: CPU: 1 PID: 682 at net/ipv6/ip6mr.c:419 ip6mr_free_table+0xc6/0x130
> > [ 106.098015] Modules linked in:
> > [ 106.098454] CPU: 1 UID: 0 PID: 682 Comm: repro Not tainted 6.12.0+ #1
> > [ 106.099311] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/4
> > [ 106.100953] RIP: 0010:ip6mr_free_table+0xc6/0x130
> > [ 106.101605] Code: 40 0d 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 5e 48 83 bb 40 0d 00 00 f
> > [ 106.104018] RSP: 0018:ffff88801743fb88 EFLAGS: 00010293
> > [ 106.104940] RAX: 0000000000000000 RBX: ffff88802d009c40 RCX: ffffffff8558ee4f
> > [ 106.105887] RDX: ffff888021640000 RSI: ffffffff8558ee86 RDI: ffff88802d00a980
> > [ 106.106817] RBP: ffff88801743fba0 R08: 0000000000000000 R09: ffffed1005a013b0
> > [ 106.107758] R10: 0000000000000001 R11: 0000000000000001 R12: ffff888010796000
> > [ 106.108813] R13: 0000000000000001 R14: dead000000000100 R15: dffffc0000000000
> > [ 106.109755] FS: 00007ff3dcab1640(0000) GS:ffff88806c500000(0000) knlGS:0000000000000000
> > [ 106.110877] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 106.111660] CR2: 00007f8030792008 CR3: 00000000215c2006 CR4: 0000000000770ef0
> > [ 106.112614] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > [ 106.113549] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > [ 106.114482] PKRU: 55555554
> > [ 106.114856] Call Trace:
> > [ 106.115201] <TASK>
> > [ 106.115502] ? show_regs+0x6d/0x80
> > [ 106.115996] ? __warn+0xf3/0x380
> > [ 106.116499] ? report_bug+0x25e/0x4b0
> > [ 106.117014] ? ip6mr_free_table+0xc6/0x130
> > [ 106.117652] ? report_bug+0x2cb/0x4b0
> > [ 106.118211] ? ip6mr_free_table+0xc6/0x130
> > [ 106.118784] ? ip6mr_free_table+0xc7/0x130
> > [ 106.119362] ? handle_bug+0xf1/0x190
> > [ 106.119890] ? exc_invalid_op+0x3c/0x80
> > [ 106.120461] ? asm_exc_invalid_op+0x1f/0x30
> > [ 106.121089] ? ip6mr_free_table+0x8f/0x130
> > [ 106.121706] ? ip6mr_free_table+0xc6/0x130
> > [ 106.122336] ? ip6mr_free_table+0xc6/0x130
> > [ 106.122919] ? ip6mr_free_table+0xc6/0x130
> > [ 106.123499] ip6mr_rules_exit+0x12a/0x260
> > [ 106.124076] ip6mr_net_exit_batch+0x5d/0xb0
> > [ 106.124677] ? __pfx_ip6mr_net_exit_batch+0x10/0x10
> > [ 106.125382] ? __pfx_ip6mr_net_exit+0x10/0x10
> > [ 106.126033] ops_exit_list+0x132/0x190
> > [ 106.126619] setup_net+0x502/0x840
> > [ 106.127143] ? __pfx_setup_net+0x10/0x10
> > [ 106.127725] ? __pfx_down_read_killable+0x10/0x10
> > [ 106.128444] ? __mutex_init+0xfd/0x140
> > [ 106.129024] copy_net_ns+0x2bb/0x6e0
> > [ 106.129537] create_new_namespaces+0x403/0xb40
> > [ 106.130171] unshare_nsproxy_namespaces+0xca/0x200
> > [ 106.130858] ksys_unshare+0x482/0xae0
> > [ 106.131439] ? __pfx_ksys_unshare+0x10/0x10
> > [ 106.132113] ? __audit_syscall_entry+0x39c/0x500
> > [ 106.132827] __x64_sys_unshare+0x3a/0x50
> > [ 106.133432] x64_sys_call+0xd3e/0x2140
> > [ 106.134007] do_syscall_64+0x6d/0x140
> > [ 106.134574] entry_SYSCALL_64_after_hwframe+0x76/0x7e
> > [ 106.135333] RIP: 0033:0x7ff3dc83ee5d
> > [ 106.135873] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 8
> > [ 106.138484] RSP: 002b:00007ff3dcab0ca8 EFLAGS: 00000297 ORIG_RAX: 0000000000000110
> > [ 106.139569] RAX: ffffffffffffffda RBX: 00007ff3dcab1640 RCX: 00007ff3dc83ee5d
> > [ 106.140603] RDX: 00007ff3dc83ee5d RSI: 0000000000000000 RDI: 0000000064040280
> > [ 106.141608] RBP: 00007ff3dcab0d60 R08: 0000000100000001 R09: 0000000000000000
> > [ 106.142538] R10: 0000000100000001 R11: 0000000000000297 R12: 00007ff3dcab1640
> > [ 106.143474] R13: 0000000000000006 R14: 00007ff3dc89f560 R15: 0000000000000000
> > [ 106.144466] </TASK>
> > [ 106.144784] irq event stamp: 50463
> > [ 106.145252] hardirqs last enabled at (50471): [<ffffffff814615c5>] __up_console_sem+0x95/0xb0
> > [ 106.146386] hardirqs last disabled at (50478): [<ffffffff814615aa>] __up_console_sem+0x7a/0xb0
> > [ 106.147514] softirqs last enabled at (50120): [<ffffffff8128cc8e>] __irq_exit_rcu+0x10e/0x170
> > [ 106.148727] softirqs last disabled at (50107): [<ffffffff8128cc8e>] __irq_exit_rcu+0x10e/0x170
> > [ 106.149948] ---[ end trace 0000000000000000 ]---
> > [ 106.158499] ------------[ cut here ]------------
> > [ 106.159167] WARNING: CPU: 1 PID: 682 at net/ipv4/ipmr.c:440 ipmr_rules_exit+0x14b/0x1d0
> > [ 106.160449] Modules linked in:
> > [ 106.160933] CPU: 1 UID: 0 PID: 682 Comm: repro Tainted: G W 6.12.0+ #1
> > [ 106.162053] Tainted: [W]=WARN
> > [ 106.162492] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/4
> > [ 106.164206] RIP: 0010:ipmr_rules_exit+0x14b/0x1d0
> > [ 106.164915] Code: df 48 c1 ea 03 80 3c 02 00 75 7b 48 c7 83 08 08 00 00 00 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc 6
> > [ 106.167497] RSP: 0018:ffff88801743fbc0 EFLAGS: 00010293
> > [ 106.168432] RAX: 0000000000000000 RBX: ffff88802d009c40 RCX: ffffffff85369a4b
> > [ 106.169436] RDX: ffff888021640000 RSI: ffffffff85369abb RDI: 0000000000000005
> > [ 106.170449] RBP: ffff88801743fbe8 R08: 0000000000000000 R09: ffffed1005a013b0
> > [ 106.171462] R10: 0000000000000001 R11: 0000000000000001 R12: ffff888021756000
> > [ 106.172592] R13: 0000000000000001 R14: ffff88802d00a448 R15: ffff88802d009c40
> > [ 106.173605] FS: 00007ff3dcab1640(0000) GS:ffff88806c500000(0000) knlGS:0000000000000000
> > [ 106.174742] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 106.175568] CR2: 00007f0c14691000 CR3: 00000000215c2006 CR4: 0000000000770ef0
> > [ 106.176685] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > [ 106.177702] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > [ 106.178717] PKRU: 55555554
> > [ 106.179131] Call Trace:
> > [ 106.179469] <TASK>
> > [ 106.179770] ? show_regs+0x6d/0x80
> > [ 106.180294] ? __warn+0xf3/0x380
> > [ 106.180761] ? report_bug+0x25e/0x4b0
> > [ 106.181302] ? ipmr_rules_exit+0x14b/0x1d0
> > [ 106.181925] ? report_bug+0x2cb/0x4b0
> > [ 106.182491] ? ipmr_rules_exit+0x14b/0x1d0
> > [ 106.183111] ? ipmr_rules_exit+0x14c/0x1d0
> > [ 106.183726] ? handle_bug+0xf1/0x190
> > [ 106.184315] ? exc_invalid_op+0x3c/0x80
> > [ 106.184915] ? asm_exc_invalid_op+0x1f/0x30
> > [ 106.185567] ? ipmr_rules_exit+0xdb/0x1d0
> > [ 106.186177] ? ipmr_rules_exit+0x14b/0x1d0
> > [ 106.186793] ? ipmr_rules_exit+0x14b/0x1d0
> > [ 106.187429] ipmr_net_exit_batch+0x5d/0xb0
> > [ 106.188045] ? __pfx_ipmr_net_exit_batch+0x10/0x10
> > [ 106.188778] ? __pfx_ipmr_net_exit+0x10/0x10
> > [ 106.189423] ops_exit_list+0x132/0x190
> > [ 106.190020] setup_net+0x502/0x840
> > [ 106.190549] ? __pfx_setup_net+0x10/0x10
> > [ 106.191142] ? __pfx_down_read_killable+0x10/0x10
> > [ 106.191845] ? __mutex_init+0xfd/0x140
> > [ 106.192461] copy_net_ns+0x2bb/0x6e0
> > [ 106.193024] create_new_namespaces+0x403/0xb40
> > [ 106.193706] unshare_nsproxy_namespaces+0xca/0x200
> > [ 106.194427] ksys_unshare+0x482/0xae0
> > [ 106.195001] ? __pfx_ksys_unshare+0x10/0x10
> > [ 106.195648] ? __audit_syscall_entry+0x39c/0x500
> > [ 106.196384] __x64_sys_unshare+0x3a/0x50
> > [ 106.196988] x64_sys_call+0xd3e/0x2140
> > [ 106.197555] do_syscall_64+0x6d/0x140
> > [ 106.198120] entry_SYSCALL_64_after_hwframe+0x76/0x7e
> > [ 106.198870] RIP: 0033:0x7ff3dc83ee5d
> > [ 106.199409] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 8
> > [ 106.202011] RSP: 002b:00007ff3dcab0ca8 EFLAGS: 00000297 ORIG_RAX: 0000000000000110
> > [ 106.203093] RAX: ffffffffffffffda RBX: 00007ff3dcab1640 RCX: 00007ff3dc83ee5d
> > [ 106.204126] RDX: 00007ff3dc83ee5d RSI: 0000000000000000 RDI: 0000000064040280
> > [ 106.205144] RBP: 00007ff3dcab0d60 R08: 0000000100000001 R09: 0000000000000000
> > [ 106.206160] R10: 0000000100000001 R11: 0000000000000297 R12: 00007ff3dcab1640
> > [ 106.207175] R13: 0000000000000006 R14: 00007ff3dc89f560 R15: 0000000000000000
> > [ 106.208253] </TASK>
> > [ 106.208592] irq event stamp: 51871
> > [ 106.209097] hardirqs last enabled at (51879): [<ffffffff814615c5>] __up_console_sem+0x95/0xb0
> > [ 106.210317] hardirqs last disabled at (51886): [<ffffffff814615aa>] __up_console_sem+0x7a/0xb0
> > [ 106.211536] softirqs last enabled at (51802): [<ffffffff8128cc8e>] __irq_exit_rcu+0x10e/0x170
> > [ 106.212814] softirqs last disabled at (51903): [<ffffffff8128cc8e>] __irq_exit_rcu+0x10e/0x170
> > [ 106.213954] ---[ end trace 0000000000000000 ]---
> > "
> >
> > Regards,
> > Yi Lai
> >
> > ---
> >
> > If you don't need the following environment to reproduce the problem or if you
> > already have one reproduced environment, please ignore the following information.
> >
> > How to reproduce:
> > git clone https://gitlab.com/xupengfe/repro_vm_env.git
> > cd repro_vm_env
> > tar -xvf repro_vm_env.tar.gz
> > cd repro_vm_env; ./start3.sh // it needs qemu-system-x86_64 and I used v7.1.0
> > // start3.sh will load bzImage_2241ab53cbb5cdb08a6b2d4688feb13971058f65 v6.2-rc5 kernel
> > // You could change the bzImage_xxx as you want
> > // Maybe you need to remove line "-drive if=pflash,format=raw,readonly=on,file=./OVMF_CODE.fd \" for different qemu version
> > You could use below command to log in, there is no password for root.
> > ssh -p 10023 root@...alhost
> >
> > After login vm(virtual machine) successfully, you could transfer reproduced
> > binary to the vm by below way, and reproduce the problem in vm:
> > gcc -pthread -o repro repro.c
> > scp -P 10023 repro root@...alhost:/root/
> >
> > Get the bzImage for target kernel:
> > Please use target kconfig and copy it to kernel_src/.config
> > make olddefconfig
> > make -jx bzImage //x should equal or less than cpu num your pc has
> >
> > Fill the bzImage file into above start3.sh to load the target kernel in vm.
> >
> >
> > Tips:
> > If you already have qemu-system-x86_64, please ignore below info.
> > If you want to install qemu v7.1.0 version:
> > git clone https://github.com/qemu/qemu.git
> > cd qemu
> > git checkout -f v7.1.0
> > mkdir build
> > cd build
> > yum install -y ninja-build.x86_64
> > yum -y install libslirp-devel.x86_64
> > ../configure --target-list=x86_64-softmmu --enable-kvm --enable-vnc --enable-gtk --enable-sdl --enable-usb-redir --enable-slirp
> > make
> > make install
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