linux-kernel - Re: [syzbot] [media?] INFO: task hung in cec_claim_log

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Message-ID: <00000000000050a83e0611e4a597@google.com>
Date: Wed, 21 Feb 2024 05:53:03 -0800
From: syzbot <syzbot+116b65a23bc791ae49a6@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [media?] INFO: task hung in cec_claim_log_addrs

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: task hung in cec_claim_log_addrs

INFO: task syz-executor.1:9052 blocked for more than 143 seconds.
      Tainted: G    B              6.8.0-rc5-syzkaller-00063-ge6ac7c55d3ec-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:0     pid:9052  tgid:9051  ppid:6538   flags:0x0000000d
Call trace:
 __switch_to+0x314/0x560 arch/arm64/kernel/process.c:556
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x1498/0x24b4 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0xb8/0x19c kernel/sched/core.c:6817
 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2159
 do_wait_for_common+0x30c/0x468 kernel/sched/completion.c:95
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x48/0x60 kernel/sched/completion.c:148
 cec_claim_log_addrs+0x180/0x244 drivers/media/cec/core/cec-adap.c:1607
 __cec_s_log_addrs+0x1238/0x18d8 drivers/media/cec/core/cec-adap.c:1922
 cec_adap_s_log_addrs drivers/media/cec/core/cec-api.c:184 [inline]
 cec_ioctl+0x2684/0x37b0 drivers/media/cec/core/cec-api.c:528
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl fs/ioctl.c:857 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
INFO: lockdep is turned off.


Tested on:

commit:         e6ac7c55 Merge branch 'for-next/core' into for-kernelci
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1772604a180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=af5c6c699e57bbb3
dashboard link: https://syzkaller.appspot.com/bug?extid=116b65a23bc791ae49a6
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13488eb4180000