From: Eric Biggers <ebiggers@kernel.org>
To: syzbot <syzbot+9e0b179ae55eaf7a307a@syzkaller.appspotmail.com>
Cc: bjorn.andersson@linaro.org, davem@davemloft.net, kuba@kernel.org,
linux-kernel@vger.kernel.org, manivannan.sadhasivam@linaro.org,
netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: BUG: using smp_processor_id() in preemptible code in debug_smp_processor_id
Date: Thu, 4 Jun 2020 21:06:06 -0700 [thread overview]
Message-ID: <20200605040606.GC2667@sol.localdomain> (raw)
In-Reply-To: <000000000000c4abec05a7432666@google.com>
On Thu, Jun 04, 2020 at 07:42:18AM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 065fcfd4 selftests: net: ip_defrag: ignore EPERM
> git tree: net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=15c3e516100000
> kernel config: https://syzkaller.appspot.com/x/.config?x=d89141553e61b775
> dashboard link: https://syzkaller.appspot.com/bug?extid=9e0b179ae55eaf7a307a
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=131b5cf2100000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=176dfcf2100000
>
> The bug was bisected to:
>
> commit e42671084361302141a09284fde9bbc14fdd16bf
> Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> Date: Thu May 7 12:53:06 2020 +0000
>
> net: qrtr: Do not depend on ARCH_QCOM
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1295eb91100000
> final crash: https://syzkaller.appspot.com/x/report.txt?x=1195eb91100000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1695eb91100000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+9e0b179ae55eaf7a307a@syzkaller.appspotmail.com
> Fixes: e42671084361 ("net: qrtr: Do not depend on ARCH_QCOM")
>
> RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000004
> RBP: 00000000006cb018 R08: 0000000000000001 R09: 00000000004002c8
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401e90
> R13: 0000000000401f20 R14: 0000000000000000 R15: 0000000000000000
> BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor013/7182
> caller is radix_tree_node_alloc.constprop.0+0x200/0x330 lib/radix-tree.c:264
> CPU: 0 PID: 7182 Comm: syz-executor013 Not tainted 5.7.0-rc7-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x188/0x20d lib/dump_stack.c:118
> check_preemption_disabled lib/smp_processor_id.c:47 [inline]
> debug_smp_processor_id.cold+0x88/0x9b lib/smp_processor_id.c:57
> radix_tree_node_alloc.constprop.0+0x200/0x330 lib/radix-tree.c:264
> radix_tree_extend+0x234/0x4a0 lib/radix-tree.c:426
> idr_get_free+0x60c/0x8e0 lib/radix-tree.c:1494
> idr_alloc_u32+0x170/0x2d0 lib/idr.c:46
> idr_alloc+0xc2/0x130 lib/idr.c:87
> qrtr_port_assign net/qrtr/qrtr.c:703 [inline]
> __qrtr_bind.isra.0+0x12e/0x5c0 net/qrtr/qrtr.c:756
> qrtr_autobind net/qrtr/qrtr.c:787 [inline]
> qrtr_autobind+0xaf/0xf0 net/qrtr/qrtr.c:775
> qrtr_sendmsg+0x1d6/0x770 net/qrtr/qrtr.c:895
> sock_sendmsg_nosec net/socket.c:652 [inline]
> sock_sendmsg+0xcf/0x120 net/socket.c:672
> ____sys_sendmsg+0x6e6/0x810 net/socket.c:2352
> ___sys_sendmsg+0x100/0x170 net/socket.c:2406
> __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
> do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
> entry_SYSCALL_64_after_hwframe+0x49/0xb3
> RIP: 0033:0x4405a9
> Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007ffe905331b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 00000000004a1bd8 RCX: 00000000004405a9
> RDX: 0000000000000000 RSI: 00000000
#syz dup: BUG: using smp_processor_id() in preemptible code in radix_tree_node_alloc
See discussion at https://lkml.kernel.org/lkml/000000000000a363b205a74ca6a2@google.com/T/#u
prev parent reply other threads:[~2020-06-05 4:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-04 14:42 BUG: using smp_processor_id() in preemptible code in debug_smp_processor_id syzbot
2020-06-05 4:06 ` Eric Biggers [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200605040606.GC2667@sol.localdomain \
--to=ebiggers@kernel.org \
--cc=bjorn.andersson@linaro.org \
--cc=davem@davemloft.net \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=manivannan.sadhasivam@linaro.org \
--cc=netdev@vger.kernel.org \
--cc=syzbot+9e0b179ae55eaf7a307a@syzkaller.appspotmail.com \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).