Re: INFO: task hung in path_openat

From: Matthew Wilcox
Date: Mon Jan 10 2022 - 22:39:08 EST

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In reply to: cruise k: "INFO: task hung in path_openat"
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Dmitry,

Please stop syzbot from playing with the SCHED_FIFO setting.
We're being inundated with these useless bug reports.

On Tue, Jan 11, 2022 at 10:15:26AM +0800, cruise k wrote:
> Hi,
>
> Syzkaller found the following issue:
>
> HEAD commit: 75acfdb Linux 5.16-rc8
> git tree: upstream
> console output: https://pastebin.com/raw/7TSe1kGF
> kernel config: https://pastebin.com/raw/XsnKfdRt
>
> And hope the report log can help you.
>
> INFO: task systemd-udevd:27429 blocked for more than 146 seconds.
> Not tainted 5.16.0-rc8+ #10
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:systemd-udevd state:D stack:26528 pid:27429 ppid: 3127 flags:0x00000000
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:4972 [inline]
> __schedule+0xcd9/0x2550 kernel/sched/core.c:6253
> schedule+0xd2/0x260 kernel/sched/core.c:6326
> rwsem_down_write_slowpath+0x664/0x1190 kernel/locking/rwsem.c:1151
> __down_write_common kernel/locking/rwsem.c:1268 [inline]
> __down_write_common kernel/locking/rwsem.c:1265 [inline]
> __down_write kernel/locking/rwsem.c:1277 [inline]
> down_write+0x135/0x150 kernel/locking/rwsem.c:1524
> inode_lock include/linux/fs.h:783 [inline]
> open_last_lookups fs/namei.c:3347 [inline]
> path_openat+0xa66/0x26c0 fs/namei.c:3556
> do_filp_open+0x1c1/0x290 fs/namei.c:3586
> do_sys_openat2+0x61b/0x9a0 fs/open.c:1212
> do_sys_open+0xc3/0x140 fs/open.c:1228
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x7fde8feb06f0
> RSP: 002b:00007ffdc8b61368 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fde8feb06f0
> RDX: 0000000000000180 RSI: 00000000000800c2 RDI: 00005624b8ca9880
> RBP: 000000000003a2f8 R08: 000000000000fefe R09: 00007fde8ff03740
> R10: 0000000000000000 R11: 0000000000000246 R12: 00005624b8ca9895
> R13: 8421084210842109 R14: 00000000000800c2 R15: 00007fde8ff3e540
> </TASK>
> INFO: task systemd-udevd:27467 blocked for more than 148 seconds.
> Not tainted 5.16.0-rc8+ #10
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:systemd-udevd state:D stack:27072 pid:27467 ppid: 3127 flags:0x00000000
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:4972 [inline]
> __schedule+0xcd9/0x2550 kernel/sched/core.c:6253
> schedule+0xd2/0x260 kernel/sched/core.c:6326
> rwsem_down_write_slowpath+0x664/0x1190 kernel/locking/rwsem.c:1151
> __down_write_common kernel/locking/rwsem.c:1268 [inline]
> __down_write_common kernel/locking/rwsem.c:1265 [inline]
> __down_write kernel/locking/rwsem.c:1277 [inline]
> down_write+0x135/0x150 kernel/locking/rwsem.c:1524
> inode_lock include/linux/fs.h:783 [inline]
> open_last_lookups fs/namei.c:3347 [inline]
> path_openat+0xa66/0x26c0 fs/namei.c:3556
> do_filp_open+0x1c1/0x290 fs/namei.c:3586
> do_sys_openat2+0x61b/0x9a0 fs/open.c:1212
> do_sys_open+0xc3/0x140 fs/open.c:1228
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x7fde8feb06f0
> RSP: 002b:00007ffdc8b60d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fde8feb06f0
> RDX: 0000000000000180 RSI: 00000000000800c2 RDI: 00005624b8c989c0
> RBP: 000000000003a2f8 R08: 000000000000fcfe R09: 00007fde8ff03740
> R10: 0000000000000000 R11: 0000000000000246 R12: 00005624b8c989d6
> R13: 8421084210842109 R14: 00000000000800c2 R15: 00007fde8ff3e540
> </TASK>
> INFO: task systemd-udevd:27515 blocked for more than 150 seconds.
> Not tainted 5.16.0-rc8+ #10
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:systemd-udevd state:D stack:27584 pid:27515 ppid: 3127 flags:0x00004000
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:4972 [inline]
> __schedule+0xcd9/0x2550 kernel/sched/core.c:6253
> schedule+0xd2/0x260 kernel/sched/core.c:6326
> rwsem_down_write_slowpath+0x664/0x1190 kernel/locking/rwsem.c:1151
> __down_write_common kernel/locking/rwsem.c:1268 [inline]
> __down_write_common kernel/locking/rwsem.c:1265 [inline]
> __down_write kernel/locking/rwsem.c:1277 [inline]
> down_write+0x135/0x150 kernel/locking/rwsem.c:1524
> inode_lock include/linux/fs.h:783 [inline]
> open_last_lookups fs/namei.c:3347 [inline]
> path_openat+0xa66/0x26c0 fs/namei.c:3556
> do_filp_open+0x1c1/0x290 fs/namei.c:3586
> do_sys_openat2+0x61b/0x9a0 fs/open.c:1212
> do_sys_open+0xc3/0x140 fs/open.c:1228
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x7fde8feb06f0
> RSP: 002b:00007ffdc8b60d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fde8feb06f0
> RDX: 0000000000000180 RSI: 00000000000800c2 RDI: 00005624b8cad110
> RBP: 000000000003a2f8 R08: 000000000000fefe R09: 00007fde8ff03740
> R10: 0000000000000000 R11: 0000000000000246 R12: 00005624b8cad126
> R13: 8421084210842109 R14: 00000000000800c2 R15: 00007fde8ff3e540
> </TASK>
> INFO: task systemd-udevd:27530 blocked for more than 153 seconds.
> Not tainted 5.16.0-rc8+ #10
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:systemd-udevd state:D stack:26048 pid:27530 ppid: 3127 flags:0x00000000
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:4972 [inline]
> __schedule+0xcd9/0x2550 kernel/sched/core.c:6253
> schedule+0xd2/0x260 kernel/sched/core.c:6326
> rwsem_down_write_slowpath+0x664/0x1190 kernel/locking/rwsem.c:1151
> __down_write_common kernel/locking/rwsem.c:1268 [inline]
> __down_write_common kernel/locking/rwsem.c:1265 [inline]
> __down_write kernel/locking/rwsem.c:1277 [inline]
> down_write+0x135/0x150 kernel/locking/rwsem.c:1524
> inode_lock include/linux/fs.h:783 [inline]
> open_last_lookups fs/namei.c:3347 [inline]
> path_openat+0xa66/0x26c0 fs/namei.c:3556
> do_filp_open+0x1c1/0x290 fs/namei.c:3586
> do_sys_openat2+0x61b/0x9a0 fs/open.c:1212
> do_sys_open+0xc3/0x140 fs/open.c:1228
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x7fde8feb06f0
> RSP: 002b:00007ffdc8b61368 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fde8feb06f0
> RDX: 0000000000000180 RSI: 00000000000800c2 RDI: 00005624b8ca9880
> RBP: 000000000003a2f8 R08: 000000000000fefe R09: 00007fde8ff03740
> R10: 0000000000000000 R11: 0000000000000246 R12: 00005624b8ca9896
> R13: 8421084210842109 R14: 00000000000800c2 R15: 00007fde8ff3e540
> </TASK>

Next message: Peng Fan: "RE: [PATCH 0/5] clocksource/drivers/imx: several updates"
Previous message: Peng Fan (OSS): "[PATCH 2/9] dt-bindings: remoteproc: imx_rproc: support i.MX8QM"
In reply to: cruise k: "INFO: task hung in path_openat"
Next in thread: Matthew Wilcox: "Re: INFO: task hung in path_openat"
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