* [syzbot] [tomoyo?] [fs?] INFO: rcu detected stall in newfstatat (3)
@ 2023-06-10 9:07 syzbot
2023-06-10 10:09 ` Tetsuo Handa
2024-03-07 9:22 ` [syzbot] [usb] " syzbot
0 siblings, 2 replies; 5+ messages in thread
From: syzbot @ 2023-06-10 9:07 UTC (permalink / raw
To: jmorris, linux-fsdevel, linux-kernel, linux-security-module,
linux-usb, paul, penguin-kernel, serge, syzkaller-bugs, takedakn,
tomoyo-dev-en
Hello,
syzbot found the following issue on:
HEAD commit: d37537a1f7cf Merge 6.4-rc5 into usb-next
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
console output: https://syzkaller.appspot.com/x/log.txt?x=15d9b771280000
kernel config: https://syzkaller.appspot.com/x/.config?x=9e12d6d7f5296037
dashboard link: https://syzkaller.appspot.com/bug?extid=96127c74434e19e4609d
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=153d7959280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15bcb6b5280000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/752b1860c3b6/disk-d37537a1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6f9c9f2751b2/vmlinux-d37537a1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bf7433b7dd12/bzImage-d37537a1.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+96127c74434e19e4609d@syzkaller.appspotmail.com
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (6786 ticks this GP) idle=0174/1/0x4000000000000000 softirq=3297/3297 fqs=3
rcu: (t=10500 jiffies g=2493 q=87 ncpus=2)
CPU: 1 PID: 2476 Comm: udevd Not tainted 6.4.0-rc5-syzkaller-gd37537a1f7cf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x3c/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 66 20 fe fa 48 89 ef e8 8e 8e fe fa 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 5f 4d f3 fa 65 8b 05 20 c9 d4 79 85 c0 74 0a 5b 5d c3 e8 2c d8
RSP: 0018:ffffc90000188b20 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff16a03a6
RDX: 0000000000000000 RSI: 0000000000000101 RDI: 0000000000000001
RBP: ffff888105ff4000 R08: 0000000000000001 R09: ffffffff8b4ca8d7
R10: 0000000000000001 R11: 0000000000056001 R12: ffff8881063fd440
R13: ffff8881231c7d00 R14: dffffc0000000000 R15: ffff888107e9f900
FS: 00007f51b4974c80(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f257a8dcfe4 CR3: 0000000121905000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
spin_unlock_irqrestore include/linux/spinlock.h:405 [inline]
dummy_timer+0x1519/0x3400 drivers/usb/gadget/udc/dummy_hcd.c:2001
call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700
expire_timers+0x29b/0x4b0 kernel/time/timer.c:1751
__run_timers kernel/time/timer.c:2022 [inline]
__run_timers kernel/time/timer.c:1995 [inline]
run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
__do_softirq+0x1c1/0x8e8 kernel/softirq.c:571
invoke_softirq kernel/softirq.c:445 [inline]
__irq_exit_rcu kernel/softirq.c:650 [inline]
irq_exit_rcu+0x11b/0x190 kernel/softirq.c:662
sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1106
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:__slab_alloc_node mm/slub.c:3339 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:3441 [inline]
RIP: 0010:__kmem_cache_alloc_node+0xdc/0x2d0 mm/slub.c:3490
Code: ff ff 31 c0 e9 03 01 00 00 45 31 ff 48 85 ed 74 f1 48 c7 44 24 10 00 00 00 00 48 8b 45 00 65 48 03 05 e0 b1 6d 7e 48 8b 50 08 <4c> 8b 00 48 8b 78 10 4d 85 c0 0f 84 88 01 00 00 48 85 ff 0f 84 7f
RSP: 0018:ffffc90001517918 EFLAGS: 00000282
RAX: ffff8881f673edb0 RBX: 0000000000000d40 RCX: 0000000000000001
RDX: 000000000001da29 RSI: 0000000000000d40 RDI: ffff888100041640
RBP: ffff888100041640 R08: 0000000000000001 R09: ffffffff8907fdd7
R10: 0000000000000000 R11: 0000000000056001 R12: 0000000000000d40
R13: 00000000ffffffff R14: 000000000000003c R15: 0000000000000000
__do_kmalloc_node mm/slab_common.c:965 [inline]
__kmalloc+0x4e/0x190 mm/slab_common.c:979
kmalloc include/linux/slab.h:563 [inline]
kzalloc include/linux/slab.h:680 [inline]
tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45
tomoyo_encode2 security/tomoyo/realpath.c:31 [inline]
tomoyo_encode+0x2c/0x50 security/tomoyo/realpath.c:80
tomoyo_realpath_from_path+0x185/0x600 security/tomoyo/realpath.c:283
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x230/0x430 security/tomoyo/file.c:822
security_inode_getattr+0xd3/0x140 security/security.c:2114
vfs_getattr fs/stat.c:167 [inline]
vfs_statx+0x16e/0x430 fs/stat.c:242
vfs_fstatat+0x90/0xb0 fs/stat.c:276
__do_sys_newfstatat+0x8a/0x110 fs/stat.c:446
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f51b4a9f5f4
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007ffcce828558 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 000055c08bd08740 RCX: 00007f51b4a9f5f4
RDX: 00007ffcce828568 RSI: 00007ffcce8289f8 RDI: 00000000ffffff9c
RBP: 00007ffcce8285f8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcce8289f8
R13: 00007ffcce828568 R14: 000055c08bce9910 R15: 00007ffcce829709
</TASK>
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
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imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
---
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@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [tomoyo?] [fs?] INFO: rcu detected stall in newfstatat (3)
2023-06-10 9:07 [syzbot] [tomoyo?] [fs?] INFO: rcu detected stall in newfstatat (3) syzbot
@ 2023-06-10 10:09 ` Tetsuo Handa
2023-06-10 10:24 ` Tetsuo Handa
2023-06-10 16:15 ` Alan Stern
2024-03-07 9:22 ` [syzbot] [usb] " syzbot
1 sibling, 2 replies; 5+ messages in thread
From: Tetsuo Handa @ 2023-06-10 10:09 UTC (permalink / raw
To: Sean Young, Mauro Carvalho Chehab, linux-media
Cc: linux-usb, syzbot, syzkaller-bugs
Regarding drivers/media/rc/ directory, igorplugusb_callback() and irtoy_in_callback() and
mceusb_dev_recv() are handling -EPROTO error, by calling usb_unlink_urb() and returning
instead of calling usb_submit_urb() again. This indicates that lack of -EPROTO (and some
other error codes) handling in usb_rx_callback_intf0() is causing infinite resubmit loop.
So, which error codes does usb_rx_callback_intf0() need to handle?
static void usb_rx_callback_intf0(struct urb *urb)
{
dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
__func__, urb->status);
usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
}
#syz set subsystems: usb
On 2023/06/10 18:07, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: d37537a1f7cf Merge 6.4-rc5 into usb-next
> git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> console output: https://syzkaller.appspot.com/x/log.txt?x=15d9b771280000
> kernel config: https://syzkaller.appspot.com/x/.config?x=9e12d6d7f5296037
> dashboard link: https://syzkaller.appspot.com/bug?extid=96127c74434e19e4609d
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=153d7959280000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15bcb6b5280000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/752b1860c3b6/disk-d37537a1.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/6f9c9f2751b2/vmlinux-d37537a1.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/bf7433b7dd12/bzImage-d37537a1.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+96127c74434e19e4609d@syzkaller.appspotmail.com
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [tomoyo?] [fs?] INFO: rcu detected stall in newfstatat (3)
2023-06-10 10:09 ` Tetsuo Handa
@ 2023-06-10 10:24 ` Tetsuo Handa
2023-06-10 16:15 ` Alan Stern
1 sibling, 0 replies; 5+ messages in thread
From: Tetsuo Handa @ 2023-06-10 10:24 UTC (permalink / raw
To: Oliver Neukum, Greg Kroah-Hartman; +Cc: linux-usb, syzbot, syzkaller-bugs
Another console output at https://syzkaller.appspot.com/text?tag=CrashLog&x=1278f01e280000
suggests that wdm_int_callback() also lacks -EPROTO error handling. Maybe we should check
all USB rx callback handlers?
On 2023/06/10 19:09, Tetsuo Handa wrote:
> Regarding drivers/media/rc/ directory, igorplugusb_callback() and irtoy_in_callback() and
> mceusb_dev_recv() are handling -EPROTO error, by calling usb_unlink_urb() and returning
> instead of calling usb_submit_urb() again. This indicates that lack of -EPROTO (and some
> other error codes) handling in usb_rx_callback_intf0() is causing infinite resubmit loop.
> So, which error codes does usb_rx_callback_intf0() need to handle?
>
> static void usb_rx_callback_intf0(struct urb *urb)
> {
> dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
> __func__, urb->status);
> usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
> }
>
> #syz set subsystems: usb
>
> On 2023/06/10 18:07, syzbot wrote:
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit: d37537a1f7cf Merge 6.4-rc5 into usb-next
>> git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
>> console output: https://syzkaller.appspot.com/x/log.txt?x=15d9b771280000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=9e12d6d7f5296037
>> dashboard link: https://syzkaller.appspot.com/bug?extid=96127c74434e19e4609d
>> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=153d7959280000
>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15bcb6b5280000
>>
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/752b1860c3b6/disk-d37537a1.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/6f9c9f2751b2/vmlinux-d37537a1.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/bf7433b7dd12/bzImage-d37537a1.xz
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+96127c74434e19e4609d@syzkaller.appspotmail.com
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [tomoyo?] [fs?] INFO: rcu detected stall in newfstatat (3)
2023-06-10 10:09 ` Tetsuo Handa
2023-06-10 10:24 ` Tetsuo Handa
@ 2023-06-10 16:15 ` Alan Stern
1 sibling, 0 replies; 5+ messages in thread
From: Alan Stern @ 2023-06-10 16:15 UTC (permalink / raw
To: Tetsuo Handa
Cc: Sean Young, Mauro Carvalho Chehab, linux-media, linux-usb, syzbot,
syzkaller-bugs
On Sat, Jun 10, 2023 at 07:09:26PM +0900, Tetsuo Handa wrote:
> Regarding drivers/media/rc/ directory, igorplugusb_callback() and irtoy_in_callback() and
> mceusb_dev_recv() are handling -EPROTO error, by calling usb_unlink_urb() and returning
> instead of calling usb_submit_urb() again. This indicates that lack of -EPROTO (and some
> other error codes) handling in usb_rx_callback_intf0() is causing infinite resubmit loop.
> So, which error codes does usb_rx_callback_intf0() need to handle?
It depends on how much error handling you want to do.
In theory some USB errors are transient, so they can be worked around by
retrying over a period of several seconds. In practice I haven't found
those sorts of error to occur often enough to be worth the trouble,
although other people may disagree.
Some drivers just give up completely on any unrecognized error. That's
not an unreasonable approach. But it does make any sort of recovery
difficult -- the user may need to unbind and rebind the driver, or reset
the device, or even unplug and replug the device. (Of course, if the
reason for the error occurring in the first place was because the user
hot-unplugged the device, these considerations are moot.)
However, you should realize that the testing done by syzbot differs from
normal device operation in a signficant way: Instead of using real
hardware with real packet timings and so on, syzbot uses a software
emulator. The emulation isn't perfect, and the difference tends to show
up when drivers immediately resubmit failed URBs. The resubmitted URB
quickly fails for the same reason as before, is resubmitted again, etc.
This puts the emulator into a tight loop, much of which runs in
interrupt or softirq context, causing the system to stall. Real
hardware would not behave the same way.
Alan Stern
> static void usb_rx_callback_intf0(struct urb *urb)
> {
> dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
> __func__, urb->status);
> usb_submit_urb(ictx->rx_urb_intf0, GFP_ATOMIC);
> }
>
> #syz set subsystems: usb
>
> On 2023/06/10 18:07, syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit: d37537a1f7cf Merge 6.4-rc5 into usb-next
> > git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> > console output: https://syzkaller.appspot.com/x/log.txt?x=15d9b771280000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=9e12d6d7f5296037
> > dashboard link: https://syzkaller.appspot.com/bug?extid=96127c74434e19e4609d
> > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=153d7959280000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15bcb6b5280000
> >
> > Downloadable assets:
> > disk image: https://storage.googleapis.com/syzbot-assets/752b1860c3b6/disk-d37537a1.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/6f9c9f2751b2/vmlinux-d37537a1.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/bf7433b7dd12/bzImage-d37537a1.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+96127c74434e19e4609d@syzkaller.appspotmail.com
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [usb] INFO: rcu detected stall in newfstatat (3)
2023-06-10 9:07 [syzbot] [tomoyo?] [fs?] INFO: rcu detected stall in newfstatat (3) syzbot
2023-06-10 10:09 ` Tetsuo Handa
@ 2024-03-07 9:22 ` syzbot
1 sibling, 0 replies; 5+ messages in thread
From: syzbot @ 2024-03-07 9:22 UTC (permalink / raw
To: brauner, davem, edumazet, gregkh, jack, jiri, jmorris, kuba,
linux-fsdevel, linux-kernel, linux-media, linux-security-module,
linux-usb, mchehab, netdev, oneukum, pabeni, paul, penguin-kernel,
sean, serge, stern, syzkaller-bugs, takedakn, tomoyo-dev-en-owner,
tomoyo-dev-en, viro
syzbot has bisected this issue to:
commit c2368b19807affd7621f7c4638cd2e17fec13021
Author: Jiri Pirko <jiri@nvidia.com>
Date: Fri Jul 29 07:10:35 2022 +0000
net: devlink: introduce "unregistering" mark and use it during devlinks iteration
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14dc6736180000
start commit: 29cd507cbec2 Merge tag 'integrity-v6.8-fix' of git://git.k..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=16dc6736180000
console output: https://syzkaller.appspot.com/x/log.txt?x=12dc6736180000
kernel config: https://syzkaller.appspot.com/x/.config?x=70429b75d4a1a401
dashboard link: https://syzkaller.appspot.com/bug?extid=96127c74434e19e4609d
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11767d61180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15f691a6180000
Reported-by: syzbot+96127c74434e19e4609d@syzkaller.appspotmail.com
Fixes: c2368b19807a ("net: devlink: introduce "unregistering" mark and use it during devlinks iteration")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-03-07 9:22 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2023-06-10 9:07 [syzbot] [tomoyo?] [fs?] INFO: rcu detected stall in newfstatat (3) syzbot
2023-06-10 10:09 ` Tetsuo Handa
2023-06-10 10:24 ` Tetsuo Handa
2023-06-10 16:15 ` Alan Stern
2024-03-07 9:22 ` [syzbot] [usb] " syzbot
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