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Groups > linux.kernel > #1607524 > unrolled thread
| Started by | Dmitry Vyukov <dvyukov@google.com> |
|---|---|
| First post | 2017-03-23 15:10 +0100 |
| Last post | 2017-03-24 04:20 +0100 |
| Articles | 2 — 2 participants |
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lib, fs, cgroup: WARNING in percpu_ref_kill_and_confirm Dmitry Vyukov <dvyukov@google.com> - 2017-03-23 15:10 +0100
Re: lib, fs, cgroup: WARNING in percpu_ref_kill_and_confirm Zefan Li <lizefan@huawei.com> - 2017-03-24 04:20 +0100
| From | Dmitry Vyukov <dvyukov@google.com> |
|---|---|
| Date | 2017-03-23 15:10 +0100 |
| Subject | lib, fs, cgroup: WARNING in percpu_ref_kill_and_confirm |
| Message-ID | <tobB8-3e8-9@gated-at.bofh.it> |
Hello, The following program triggers WARNING in percpu_ref_kill_and_confirm: https://gist.githubusercontent.com/dvyukov/bcfcef3d6b24b9fd841b88ee20c14d4b/raw/a54aeeb09ad1e0659b0ed87ef5efc4480ab2536f/gistfile1.txt ------------[ cut here ]------------ WARNING: CPU: 3 PID: 19987 at lib/percpu-refcount.c:317 percpu_ref_kill_and_confirm+0x303/0x3c0 lib/percpu-refcount.c:316 percpu_ref_kill_and_confirm called more than once on css_release! CPU: 3 PID: 19987 Comm: a.out Not tainted 4.11.0-rc3+ #365 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x1b8/0x28d lib/dump_stack.c:52 panic+0x20c/0x423 kernel/panic.c:180 __warn+0x1c4/0x1e0 kernel/panic.c:541 warn_slowpath_fmt+0xc1/0x100 kernel/panic.c:564 percpu_ref_kill_and_confirm+0x303/0x3c0 lib/percpu-refcount.c:316 percpu_ref_kill include/linux/percpu-refcount.h:119 [inline] cgroup_kill_sb+0x31d/0x480 kernel/cgroup/cgroup.c:1834 deactivate_locked_super+0x99/0xe0 fs/super.c:309 deactivate_super+0x151/0x160 fs/super.c:340 cleanup_mnt+0xb2/0x160 fs/namespace.c:1115 __cleanup_mnt+0x16/0x20 fs/namespace.c:1122 task_work_run+0x1a4/0x270 kernel/task_work.c:116 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x24d/0x2d0 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline] syscall_return_slowpath+0x3bd/0x460 arch/x86/entry/common.c:260 entry_SYSCALL_64_fastpath+0xc0/0xc2 RIP: 0033:0x443129 RSP: 002b:00007ffe06080018 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffec RBX: 00000000004002b0 RCX: 0000000000443129 RDX: 000000002019cff9 RSI: 000000002000c000 RDI: 00000000204ff000 RBP: 00007ffe06080060 R08: 00000000201db000 R09: 0000000000000000 R10: 000000000000c084 R11: 0000000000000202 R12: 0000000000000000 R13: 00000000004025b0 R14: 0000000000402640 R15: 0000000000000000 On commit 093b995e3b55a0ae0670226ddfcb05bfbf0099ae
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| From | Zefan Li <lizefan@huawei.com> |
|---|---|
| Date | 2017-03-24 04:20 +0100 |
| Message-ID | <tonVE-3Jx-7@gated-at.bofh.it> |
| In reply to | #1607524 |
On 2017/3/23 22:04, Dmitry Vyukov wrote: > Hello, > > The following program triggers WARNING in percpu_ref_kill_and_confirm: > https://gist.githubusercontent.com/dvyukov/bcfcef3d6b24b9fd841b88ee20c14d4b/raw/a54aeeb09ad1e0659b0ed87ef5efc4480ab2536f/gistfile1.txt > The bug can be triggered immediately. I'll look into it. Thanks! > ------------[ cut here ]------------ > WARNING: CPU: 3 PID: 19987 at lib/percpu-refcount.c:317 > percpu_ref_kill_and_confirm+0x303/0x3c0 lib/percpu-refcount.c:316 > percpu_ref_kill_and_confirm called more than once on css_release! > CPU: 3 PID: 19987 Comm: a.out Not tainted 4.11.0-rc3+ #365 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:16 [inline] > dump_stack+0x1b8/0x28d lib/dump_stack.c:52 > panic+0x20c/0x423 kernel/panic.c:180 > __warn+0x1c4/0x1e0 kernel/panic.c:541 > warn_slowpath_fmt+0xc1/0x100 kernel/panic.c:564 > percpu_ref_kill_and_confirm+0x303/0x3c0 lib/percpu-refcount.c:316 > percpu_ref_kill include/linux/percpu-refcount.h:119 [inline] > cgroup_kill_sb+0x31d/0x480 kernel/cgroup/cgroup.c:1834 > deactivate_locked_super+0x99/0xe0 fs/super.c:309 > deactivate_super+0x151/0x160 fs/super.c:340 > cleanup_mnt+0xb2/0x160 fs/namespace.c:1115 > __cleanup_mnt+0x16/0x20 fs/namespace.c:1122 > task_work_run+0x1a4/0x270 kernel/task_work.c:116 > tracehook_notify_resume include/linux/tracehook.h:191 [inline] > exit_to_usermode_loop+0x24d/0x2d0 arch/x86/entry/common.c:161 > prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline] > syscall_return_slowpath+0x3bd/0x460 arch/x86/entry/common.c:260 > entry_SYSCALL_64_fastpath+0xc0/0xc2 > RIP: 0033:0x443129 > RSP: 002b:00007ffe06080018 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffec RBX: 00000000004002b0 RCX: 0000000000443129 > RDX: 000000002019cff9 RSI: 000000002000c000 RDI: 00000000204ff000 > RBP: 00007ffe06080060 R08: 00000000201db000 R09: 0000000000000000 > R10: 000000000000c084 R11: 0000000000000202 R12: 0000000000000000 > R13: 00000000004025b0 R14: 0000000000402640 R15: 0000000000000000 > > On commit 093b995e3b55a0ae0670226ddfcb05bfbf0099ae > . >
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